1968
657 tornadoes, 6 tropical cyclones near the U.S., 11 notable earthquakes. 51 tornadoes were rated F3/EF3 or stronger and tornadoes killed 131.
Tornadoes
657 recorded; 51 rated F3/EF3 or stronger.
Outbreak days
- May 15, 196833 tornadoes, 71 killed
Strongest and deadliest first
| May 15, 1968 | F5 | Howard, Franklin, Butler | 62.1 | 13 |
| Jun 13, 1968 | F5 | Murray, Lyon, Redwood | 9.1 | 9 |
| Apr 23, 1968 | F5 | Scioto, Lawrence, Gallia | 34.0 | 7 |
| May 15, 1968 | F5 | Fayette | 13.1 | 5 |
| May 15, 1968 | F4 | Jackson, Craighead, Mississippi | 20.9 | 35 |
| Apr 19, 1968 | F4 | Sebastian | 2.0 | 14 |
| May 15, 1968 | F4 | Independence | 0.3 | 7 |
| Apr 23, 1968 | F4 | Pendleton, Bracken, Edmonson | 78.7 | 6 |
| Apr 3, 1968 | F4 | Lincoln | 33.7 | 5 |
| Apr 3, 1968 | F4 | Calloway, Marshall, Trigg | 50.6 | 2 |
| Aug 19, 1968 | F4 | Marinette | 21.8 | 2 |
| Apr 23, 1968 | F4 | Clermont, Brown, Clinton | 24.1 | 1 |
| Apr 3, 1968 | F3 | Shelby, Tipton | 28.8 | 4 |
| May 15, 1968 | F3 | St. Clair | 2.0 | 4 |
| May 15, 1968 | F3 | Baxter | 7.3 | 3 |
| May 16, 1968 | F3 | Wabash, Huntington, Allen | 50.3 | 1 |
| Nov 17, 1968 | F3 | Chilton, Coosa | 32.3 | 1 |
| Apr 3, 1968 | F3 | Greene | 3.6 | 1 |
| May 13, 1968 | F3 | Ellis, Rooks, Osborne | 140.4 | 0 |
| Nov 3, 1968 | F3 | Mobile, Baldwin, Escambia | 70.4 | 0 |
| Apr 23, 1968 | F3 | Mecosta, Osceola | 60.9 | 0 |
| Aug 18, 1968 | F3 | Douglas | 21.3 | 0 |
| Nov 5, 1968 | F3 | Victoria | 14.4 | 0 |
| May 15, 1968 | F3 | Mason, Logan | 12.6 | 0 |
| May 13, 1968 | F3 | Pottawatomie, Seminole | 11.6 | 0 |
| Jun 20, 1968 | F3 | Davison, Hanson | 9.9 | 0 |
| Jun 20, 1968 | F3 | Walworth | 8.8 | 0 |
| Aug 23, 1968 | F3 | Barnes, Stutsman | 8.5 | 0 |
| May 15, 1968 | F3 | Iroquois | 7.1 | 0 |
| Apr 19, 1968 | F3 | Seminole | 6.6 | 0 |
| Dec 12, 1968 | F3 | Montgomery | 6.2 | 0 |
| Sep 22, 1968 | F3 | Sioux | 4.7 | 0 |
| May 24, 1968 | F3 | Scurry | 4.1 | 0 |
| Apr 14, 1968 | F3 | Bartholomew | 3.3 | 0 |
| May 15, 1968 | F3 | Miami, Cass | 2.7 | 0 |
| May 24, 1968 | F3 | Scurry | 2.7 | 0 |
| Nov 11, 1968 | F3 | Worth | 2.0 | 0 |
| Nov 3, 1968 | F3 | Harrison | 2.0 | 0 |
| May 16, 1968 | F3 | Wilbarger | 2.0 | 0 |
| May 24, 1968 | F3 | Scurry | 2.0 | 0 |
| Mar 11, 1968 | F3 | Natchitoches | 1.0 | 0 |
| Aug 20, 1968 | F3 | Hillsborough | 1.0 | 0 |
| Nov 18, 1968 | F3 | Ware | 0.5 | 0 |
| Nov 27, 1968 | F3 | Morehouse | 0.5 | 0 |
| Dec 28, 1968 | F3 | Decatur | 0.5 | 0 |
| Feb 1, 1968 | F3 | Ouachita | 0.5 | 0 |
| May 6, 1968 | F3 | Roberts | 0.5 | 0 |
| Jun 18, 1968 | F3 | Rush | 0.5 | 0 |
| Apr 23, 1968 | F3 | Greenup | 0.1 | 0 |
| Jun 20, 1968 | F3 | Walworth | 0.1 | 0 |
| Jun 30, 1968 | F3 | Aitkin | 0.1 | 0 |
| Nov 9, 1968 | F2 | Collier, Hendry | 45.6 | 2 |
| Jul 30, 1968 | F2 | Charlotte | 0.3 | 2 |
| Dec 27, 1968 | F2 | Tallahatchie | 0.1 | 1 |
| Jun 11, 1968 | F2 | Gratiot | 0.1 | 1 |
| Nov 11, 1968 | F2 | Collier, Hendry | 65.4 | 0 |
| Aug 5, 1968 | F2 | Kent, Ionia, Eaton | 52.7 | 0 |
| Nov 3, 1968 | F2 | Pearl River, Stone | 43.5 | 0 |
| Jun 30, 1968 | F2 | Douglas, Bayfield | 39.0 | 0 |
| Apr 16, 1968 | F2 | Wabaunsee, Shawnee | 38.7 | 0 |
| Jun 20, 1968 | F2 | Gregory, Charles Mix, Brule | 33.5 | 0 |
| Aug 6, 1968 | F2 | Chautauqua, Cattaraugus | 31.8 | 0 |
| Dec 1, 1968 | F2 | Escambia, Santa Rosa | 30.4 | 0 |
| Apr 21, 1968 | F2 | Kingman | 30.1 | 0 |
| Nov 9, 1968 | F2 | Pasco, Sumter | 29.6 | 0 |
| Aug 19, 1968 | F2 | Green Lake, Fond du Lac | 28.7 | 0 |
| Jun 20, 1968 | F2 | Charles Mix, Aurora | 21.4 | 0 |
| Apr 3, 1968 | F2 | Monroe, St. Clair | 19.8 | 0 |
| Nov 26, 1968 | F2 | Frio | 18.2 | 0 |
| Jun 24, 1968 | F2 | Baxter, Fulton | 17.6 | 0 |
| Jun 7, 1968 | F2 | Mecklenburg, Union | 16.7 | 0 |
| Jun 21, 1968 | F2 | Lincoln | 16.4 | 0 |
| Apr 3, 1968 | F2 | Noble, Kay | 15.9 | 0 |
| May 15, 1968 | F2 | Rice, Dakota | 15.4 | 0 |
| Apr 3, 1968 | F2 | DeSoto | 15.2 | 0 |
| Apr 3, 1968 | F2 | Crittenden | 14.9 | 0 |
| Aug 19, 1968 | F2 | Marathon | 14.3 | 0 |
| Apr 19, 1968 | F2 | Faulkner, Cleburne | 13.5 | 0 |
| May 11, 1968 | F2 | Hill | 13.5 | 0 |
| Jun 20, 1968 | F2 | Lawrence, Pennington | 13.1 | 0 |
| Apr 3, 1968 | F2 | Madison | 12.8 | 0 |
| May 15, 1968 | F2 | Johnson, Lafayette | 12.3 | 0 |
| Apr 3, 1968 | F2 | Texas, Dent | 11.9 | 0 |
| Nov 17, 1968 | F2 | Choctaw | 11.5 | 0 |
| May 22, 1968 | F2 | Kay | 11.1 | 0 |
| Nov 17, 1968 | F2 | Lawrence, Jefferson Davis | 10.8 | 0 |
| Jun 1, 1968 | F2 | Adair, Benton | 10.1 | 0 |
| Jun 11, 1968 | F2 | Wallowa | 9.6 | 0 |
| Sep 3, 1968 | F2 | Humphreys, Yazoo | 9.0 | 0 |
| May 15, 1968 | F2 | Hendricks, Morgan | 8.8 | 0 |
| Jun 25, 1968 | F2 | Muskingum, Guernsey | 8.5 | 0 |
| Mar 26, 1968 | F2 | Monroe | 7.7 | 0 |
| Dec 27, 1968 | F2 | Grenada | 7.3 | 0 |
| Jul 30, 1968 | F2 | Polk | 6.4 | 0 |
| Mar 12, 1968 | F2 | Haralson | 6.2 | 0 |
| Feb 19, 1968 | F2 | Miami-Dade | 5.7 | 0 |
| Mar 27, 1968 | F2 | Trempealeau | 5.7 | 0 |
| Dec 27, 1968 | F2 | Leflore | 5.6 | 0 |
| Dec 27, 1968 | F2 | Shelby | 5.6 | 0 |
| Apr 3, 1968 | F2 | Jasper | 5.2 | 0 |
| May 15, 1968 | F2 | Johnson | 5.2 | 0 |
| May 16, 1968 | F2 | DeSoto | 5.2 | 0 |
| May 31, 1968 | F2 | Hale, Swisher | 5.0 | 0 |
| Apr 23, 1968 | F2 | Scioto | 4.9 | 0 |
| Jun 13, 1968 | F2 | Dickinson | 4.9 | 0 |
| Apr 3, 1968 | F2 | Noble | 4.7 | 0 |
| May 13, 1968 | F2 | Mitchell | 4.7 | 0 |
| May 15, 1968 | F2 | Howard | 4.7 | 0 |
| May 6, 1968 | F2 | Harmon | 4.7 | 0 |
| Jun 24, 1968 | F2 | Texas | 4.5 | 0 |
| Nov 9, 1968 | F2 | Sarasota | 4.1 | 0 |
| Apr 4, 1968 | F2 | Marshall | 4.1 | 0 |
| Dec 18, 1968 | F2 | Tulsa | 3.8 | 0 |
| Jun 9, 1968 | F2 | Marshall | 3.8 | 0 |
| Mar 30, 1968 | F2 | Cooke | 3.6 | 0 |
| Apr 19, 1968 | F2 | Pontotoc | 3.3 | 0 |
| Apr 23, 1968 | F2 | Jessamine | 3.3 | 0 |
| Mar 18, 1968 | F2 | Watonwan | 2.5 | 0 |
| Apr 3, 1968 | F2 | Bollinger | 2.5 | 0 |
| Nov 3, 1968 | F2 | Pearl River | 2.0 | 0 |
| Dec 12, 1968 | F2 | Rusk | 2.0 | 0 |
| Apr 16, 1968 | F2 | Fremont | 2.0 | 0 |
| Apr 24, 1968 | F2 | Beaufort | 2.0 | 0 |
| Apr 2, 1968 | F2 | Carson | 2.0 | 0 |
| May 25, 1968 | F2 | Sequoyah | 2.0 | 0 |
| May 29, 1968 | F2 | Lawrence | 2.0 | 0 |
| Jun 24, 1968 | F2 | Oregon | 2.0 | 0 |
| Jun 30, 1968 | F2 | Logan | 2.0 | 0 |
| Jul 21, 1968 | F2 | Washington | 2.0 | 0 |
| Aug 16, 1968 | F2 | Outagamie | 2.0 | 0 |
| Aug 30, 1968 | F2 | Volusia | 2.0 | 0 |
| Dec 18, 1968 | F2 | Caddo | 1.8 | 0 |
| Mar 11, 1968 | F2 | Leflore | 1.5 | 0 |
| Apr 19, 1968 | F2 | Cooke | 1.5 | 0 |
| May 9, 1968 | F2 | Nueces | 1.5 | 0 |
| Jun 10, 1968 | F2 | Greenwood | 1.5 | 0 |
| Aug 14, 1968 | F2 | Weber | 1.5 | 0 |
| Sep 12, 1968 | F2 | Brevard | 1.5 | 0 |
| Apr 2, 1968 | F2 | Beckham | 1.4 | 0 |
| Feb 1, 1968 | F2 | Jefferson | 1.3 | 0 |
| Apr 16, 1968 | F2 | Nemaha | 1.2 | 0 |
| Dec 12, 1968 | F2 | Harrison | 1.0 | 0 |
| Dec 27, 1968 | F2 | Rusk | 1.0 | 0 |
| Dec 27, 1968 | F2 | Cass | 1.0 | 0 |
| Dec 27, 1968 | F2 | Leake | 1.0 | 0 |
| Mar 12, 1968 | F2 | Beaufort | 1.0 | 0 |
| Apr 19, 1968 | F2 | Le Flore | 1.0 | 0 |
| Apr 21, 1968 | F2 | Angelina | 1.0 | 0 |
| Apr 23, 1968 | F2 | Acadia | 1.0 | 0 |
| May 10, 1968 | F2 | Calhoun | 1.0 | 0 |
| May 15, 1968 | F2 | Wayne | 1.0 | 0 |
| May 17, 1968 | F2 | Darlington | 1.0 | 0 |
| Jun 30, 1968 | F2 | Forest | 1.0 | 0 |
| Aug 16, 1968 | F2 | Livingston | 1.0 | 0 |
| Aug 16, 1968 | F2 | Brown | 1.0 | 0 |
| Sep 16, 1968 | F2 | Stone | 1.0 | 0 |
| Sep 17, 1968 | F2 | Washington | 1.0 | 0 |
| Sep 9, 1968 | F2 | Kent | 1.0 | 0 |
| Sep 9, 1968 | F2 | Monroe | 0.9 | 0 |
| May 29, 1968 | F2 | Floyd | 0.8 | 0 |
| Jun 8, 1968 | F2 | Beaver | 0.8 | 0 |
| Sep 17, 1968 | F2 | Bee | 0.8 | 0 |
| Nov 30, 1968 | F2 | St. Landry | 0.5 | 0 |
| Mar 11, 1968 | F2 | Jackson | 0.5 | 0 |
| Apr 16, 1968 | F2 | Fremont | 0.5 | 0 |
| Apr 3, 1968 | F2 | O'Brien | 0.5 | 0 |
| Apr 3, 1968 | F2 | Jefferson | 0.5 | 0 |
| Jun 18, 1968 | F2 | Quay | 0.5 | 0 |
| Jun 24, 1968 | F2 | Smith | 0.5 | 0 |
| Sep 11, 1968 | F2 | Minidoka | 0.5 | 0 |
| May 13, 1968 | F2 | Collin | 0.4 | 0 |
| Dec 7, 1968 | F2 | Horry | 0.3 | 0 |
| Apr 16, 1968 | F2 | Logan | 0.3 | 0 |
| Aug 22, 1968 | F2 | Baraga | 0.3 | 0 |
| Aug 24, 1968 | F2 | Turner | 0.3 | 0 |
| Aug 6, 1968 | F2 | Screven | 0.3 | 0 |
| Sep 17, 1968 | F2 | Shelby | 0.3 | 0 |
| May 13, 1968 | F2 | Johnson | 0.2 | 0 |
| May 15, 1968 | F2 | Butler | 0.2 | 0 |
| Jun 24, 1968 | F2 | Howell | 0.2 | 0 |
| Oct 18, 1968 | F2 | Manatee | 0.1 | 0 |
| Oct 3, 1968 | F2 | Maricopa | 0.1 | 0 |
| Nov 11, 1968 | F2 | Sarasota | 0.1 | 0 |
| Dec 27, 1968 | F2 | Lowndes | 0.1 | 0 |
| Dec 3, 1968 | F2 | Lowndes | 0.1 | 0 |
| Apr 14, 1968 | F2 | White | 0.1 | 0 |
| Apr 14, 1968 | F2 | Delaware | 0.1 | 0 |
| Apr 16, 1968 | F2 | Pawnee | 0.1 | 0 |
| Apr 20, 1968 | F2 | Dane | 0.1 | 0 |
| Apr 22, 1968 | F2 | Oklahoma | 0.1 | 0 |
| Apr 23, 1968 | F2 | Bracken, Mason | 0.1 | 0 |
| Apr 27, 1968 | F2 | Jefferson | 0.1 | 0 |
| Apr 3, 1968 | F2 | Arkansas | 0.1 | 0 |
| May 15, 1968 | F2 | Tippecanoe | 0.1 | 0 |
| May 15, 1968 | F2 | Clinton | 0.1 | 0 |
| May 26, 1968 | F2 | Warren | 0.1 | 0 |
| Jun 11, 1968 | F2 | Clinton | 0.1 | 0 |
| Jun 13, 1968 | F2 | Osceola | 0.1 | 0 |
| Jun 13, 1968 | F2 | Woodbury | 0.1 | 0 |
| Jun 13, 1968 | F2 | Hodgeman | 0.1 | 0 |
| Jun 17, 1968 | F2 | St. Helena | 0.1 | 0 |
| Jun 20, 1968 | F2 | Perkins | 0.1 | 0 |
| Jun 20, 1968 | F2 | Stanley | 0.1 | 0 |
| Jun 23, 1968 | F2 | Starke | 0.1 | 0 |
| Jun 24, 1968 | F2 | Prowers | 0.1 | 0 |
| Jun 25, 1968 | F2 | Greene | 0.1 | 0 |
| Jun 2, 1968 | F2 | Toombs | 0.1 | 0 |
| Jun 9, 1968 | F2 | Roger Mills | 0.1 | 0 |
| Jul 17, 1968 | F2 | Hillsborough | 0.1 | 0 |
| Jul 30, 1968 | F2 | York | 0.1 | 0 |
| Jul 4, 1968 | F2 | Maricopa | 0.1 | 0 |
| Aug 10, 1968 | F2 | Oklahoma | 0.1 | 0 |
| Aug 9, 1968 | F2 | Scott | 0.1 | 0 |
| Sep 10, 1968 | F2 | Luzerne | 0.1 | 0 |
| May 15, 1968 | F1 | De Witt | 25.4 | 4 |
| Jun 10, 1968 | F1 | Kanabec | 0.3 | 1 |
| Nov 9, 1968 | F1 | Hillsborough, Polk, Lake | 69.3 | 0 |
| May 13, 1968 | F1 | Hall, Nance | 58.9 | 0 |
| Nov 11, 1968 | F1 | Pinellas, Hillsborough, Polk | 57.2 | 0 |
| Jun 8, 1968 | F1 | Lynn, Garza, Crosby | 42.8 | 0 |
| Jun 8, 1968 | F1 | Lynn, Lubbock, Crosby | 26.7 | 0 |
| Apr 30, 1968 | F1 | Norfolk city, Virginia Beach city | 22.5 | 0 |
| Aug 19, 1968 | F1 | Rice, Goodhue | 18.3 | 0 |
| May 15, 1968 | F1 | Steele, Dodge | 16.6 | 0 |
| May 7, 1968 | F1 | Parker | 14.7 | 0 |
| Apr 4, 1968 | F1 | Colbert | 14.4 | 0 |
| Jun 25, 1968 | F1 | Miami-Dade | 14.0 | 0 |
| Dec 27, 1968 | F1 | Nacogdoches | 13.9 | 0 |
| Nov 9, 1968 | F1 | Sarasota, Hillsborough | 12.3 | 0 |
| Nov 18, 1968 | F1 | Houston | 12.0 | 0 |
| Jan 23, 1968 | F1 | Dale, Barbour | 11.8 | 0 |
| Nov 9, 1968 | F1 | Palm Beach | 10.0 | 0 |
| Apr 19, 1968 | F1 | Elk, Greenwood | 9.9 | 0 |
| Sep 7, 1968 | F1 | Clay | 9.5 | 0 |
| Apr 23, 1968 | F1 | Hillsdale | 9.3 | 0 |
| Sep 15, 1968 | F1 | Tripp | 9.2 | 0 |
| Apr 2, 1968 | F1 | Hall | 8.5 | 0 |
| May 15, 1968 | F1 | Fillmore | 8.4 | 0 |
| Apr 3, 1968 | F1 | Clinton | 8.3 | 0 |
| Apr 23, 1968 | F1 | Licking | 8.2 | 0 |
| May 15, 1968 | F1 | Dodge | 7.8 | 0 |
| Mar 10, 1968 | F1 | Yoakum | 7.7 | 0 |
| Apr 3, 1968 | F1 | Jefferson | 7.6 | 0 |
| Jun 25, 1968 | F1 | Guernsey, Tuscarawas, Harrison | 7.3 | 0 |
| Jul 23, 1968 | F1 | Hillsdale | 6.4 | 0 |
| Aug 18, 1968 | F1 | Grant, Douglas | 6.4 | 0 |
| May 15, 1968 | F1 | Jefferson | 5.9 | 0 |
| Jun 9, 1968 | F1 | Hale, Swisher | 5.9 | 0 |
| Aug 29, 1968 | F1 | Suwannee | 5.6 | 0 |
| Apr 19, 1968 | F1 | Atoka | 5.4 | 0 |
| Aug 5, 1968 | F1 | Roscommon | 5.1 | 0 |
| Feb 1, 1968 | F1 | Franklin | 5.0 | 0 |
| Dec 27, 1968 | F1 | Gregg | 4.9 | 0 |
| Mar 11, 1968 | F1 | Talbot, Upson | 4.9 | 0 |
| May 15, 1968 | F1 | Lafayette, Saline | 4.9 | 0 |
| Apr 19, 1968 | F1 | Logan, Yell | 4.7 | 0 |
| May 31, 1968 | F1 | Garza | 4.7 | 0 |
| Jun 12, 1968 | F1 | Gadsden | 4.1 | 0 |
| Jul 17, 1968 | F1 | Warren, Knox | 3.8 | 0 |
| Aug 7, 1968 | F1 | Lapeer | 3.8 | 0 |
| May 15, 1968 | F1 | Ray | 3.6 | 0 |
| Aug 5, 1968 | F1 | Hyde | 3.6 | 0 |
| Apr 22, 1968 | F1 | Latimer | 3.3 | 0 |
| Jul 26, 1968 | F1 | Murray | 3.3 | 0 |
| Aug 15, 1968 | F1 | St. Louis | 3.3 | 0 |
| Jun 23, 1968 | F1 | Laramie | 3.0 | 0 |
| Jun 6, 1968 | F1 | Fremont | 3.0 | 0 |
| Aug 15, 1968 | F1 | Pennington | 2.7 | 0 |
| Nov 17, 1968 | F1 | Madison | 2.6 | 0 |
| May 13, 1968 | F1 | Garvin | 2.5 | 0 |
| May 15, 1968 | F1 | Jasper | 2.5 | 0 |
| Aug 17, 1968 | F1 | Tolland | 2.5 | 0 |
| Aug 20, 1968 | F1 | Hillsborough | 2.5 | 0 |
| Jul 1, 1968 | F1 | Kennebec | 2.3 | 0 |
| Oct 7, 1968 | F1 | San Patricio | 2.0 | 0 |
| Nov 15, 1968 | F1 | Harris | 2.0 | 0 |
| Nov 17, 1968 | F1 | Oconee, Clarke | 2.0 | 0 |
| Mar 11, 1968 | F1 | Thomas | 2.0 | 0 |
| Mar 12, 1968 | F1 | Lincoln | 2.0 | 0 |
| Apr 20, 1968 | F1 | Fillmore | 2.0 | 0 |
| Apr 20, 1968 | F1 | Dodge | 2.0 | 0 |
| Apr 4, 1968 | F1 | Warren | 2.0 | 0 |
| May 14, 1968 | F1 | Colbert | 2.0 | 0 |
| May 15, 1968 | F1 | Audubon | 2.0 | 0 |
| May 28, 1968 | F1 | Ben Hill | 2.0 | 0 |
| Jun 25, 1968 | F1 | Parker | 2.0 | 0 |
| Jul 14, 1968 | F1 | Pinellas | 2.0 | 0 |
| Jul 30, 1968 | F1 | Polk | 2.0 | 0 |
| Aug 5, 1968 | F1 | Outagamie | 1.9 | 0 |
| Apr 22, 1968 | F1 | Denton | 1.5 | 0 |
| May 15, 1968 | F1 | Dunklin | 1.5 | 0 |
| Oct 21, 1968 | F1 | Tarrant | 1.0 | 0 |
| Oct 8, 1968 | F1 | Pecos | 1.0 | 0 |
| Nov 26, 1968 | F1 | La Salle | 1.0 | 0 |
| Nov 30, 1968 | F1 | St. Landry | 1.0 | 0 |
| Dec 22, 1968 | F1 | Rusk | 1.0 | 0 |
| Apr 16, 1968 | F1 | Atchison | 1.0 | 0 |
| Apr 19, 1968 | F1 | Newton | 1.0 | 0 |
| Apr 2, 1968 | F1 | Floyd | 1.0 | 0 |
| May 11, 1968 | F1 | Aransas | 1.0 | 0 |
| May 13, 1968 | F1 | Dallas | 1.0 | 0 |
| May 13, 1968 | F1 | Garvin | 1.0 | 0 |
| May 15, 1968 | F1 | Wayne | 1.0 | 0 |
| May 17, 1968 | F1 | Coryell | 1.0 | 0 |
| May 9, 1968 | F1 | Nueces | 1.0 | 0 |
| May 9, 1968 | F1 | Nueces | 1.0 | 0 |
| Jun 24, 1968 | F1 | Shannon | 1.0 | 0 |
| Aug 14, 1968 | F1 | Hartley | 1.0 | 0 |
| Aug 9, 1968 | F1 | Bristol, Plymouth | 1.0 | 0 |
| May 28, 1968 | F1 | Ben Hill | 0.9 | 0 |
| Nov 4, 1968 | F1 | Florence | 0.8 | 0 |
| Jun 24, 1968 | F1 | San Augustine | 0.8 | 0 |
| Jul 2, 1968 | F1 | Citrus | 0.8 | 0 |
| Aug 8, 1968 | F1 | Horry | 0.6 | 0 |
| Nov 17, 1968 | F1 | Rapides | 0.5 | 0 |
| Dec 18, 1968 | F1 | Pittsburg | 0.5 | 0 |
| Dec 30, 1968 | F1 | Calcasieu | 0.5 | 0 |
| Mar 12, 1968 | F1 | Berrien | 0.5 | 0 |
| Mar 22, 1968 | F1 | Spartanburg | 0.5 | 0 |
| Apr 19, 1968 | F1 | Kay | 0.5 | 0 |
| Apr 22, 1968 | F1 | Collin | 0.5 | 0 |
| Apr 3, 1968 | F1 | Cherokee | 0.5 | 0 |
| Apr 3, 1968 | F1 | Williamson | 0.5 | 0 |
| May 18, 1968 | F1 | Columbia | 0.5 | 0 |
| May 23, 1968 | F1 | Weld | 0.5 | 0 |
| Jun 20, 1968 | F1 | Plaquemines | 0.5 | 0 |
| Jun 22, 1968 | F1 | Plymouth | 0.5 | 0 |
| Jun 25, 1968 | F1 | Portage | 0.5 | 0 |
| Jun 30, 1968 | F1 | Marinette | 0.5 | 0 |
| Jul 17, 1968 | F1 | Comanche | 0.5 | 0 |
| Jul 22, 1968 | F1 | Hodgeman | 0.5 | 0 |
| Jul 7, 1968 | F1 | Bottineau | 0.5 | 0 |
| Aug 15, 1968 | F1 | Pennington | 0.5 | 0 |
| Aug 16, 1968 | F1 | Delta | 0.5 | 0 |
| May 9, 1968 | F1 | Nueces | 0.4 | 0 |
| Jun 11, 1968 | F1 | Oconee | 0.4 | 0 |
| Jun 24, 1968 | F1 | Prowers | 0.4 | 0 |
| Nov 26, 1968 | F1 | Atascosa | 0.3 | 0 |
| Nov 9, 1968 | F1 | Brevard | 0.3 | 0 |
| Dec 27, 1968 | F1 | Smith | 0.3 | 0 |
| Jan 18, 1968 | F1 | Lampasas | 0.3 | 0 |
| Mar 22, 1968 | F1 | Anderson | 0.3 | 0 |
| Apr 14, 1968 | F1 | Coffee | 0.3 | 0 |
| Apr 22, 1968 | F1 | Tarrant | 0.3 | 0 |
| Apr 26, 1968 | F1 | Ellis | 0.3 | 0 |
| May 13, 1968 | F1 | Pittsburg | 0.3 | 0 |
| May 15, 1968 | F1 | Fayette | 0.3 | 0 |
| May 25, 1968 | F1 | Parker | 0.3 | 0 |
| Jun 11, 1968 | F1 | Sheridan | 0.3 | 0 |
| Jun 24, 1968 | F1 | Wright | 0.3 | 0 |
| Jun 4, 1968 | F1 | Brevard | 0.3 | 0 |
| Jun 7, 1968 | F1 | Sheridan | 0.3 | 0 |
| Jun 7, 1968 | F1 | Tuscola | 0.3 | 0 |
| Jun 9, 1968 | F1 | Otter Tail | 0.3 | 0 |
| Jul 17, 1968 | F1 | Worcester | 0.3 | 0 |
| Jul 1, 1968 | F1 | Waldo | 0.3 | 0 |
| Jul 1, 1968 | F1 | Essex | 0.3 | 0 |
| Aug 4, 1968 | F1 | Wexford | 0.3 | 0 |
| Sep 20, 1968 | F1 | Ingham | 0.3 | 0 |
| Feb 1, 1968 | F1 | Beauregard | 0.2 | 0 |
| Apr 21, 1968 | F1 | Logan | 0.2 | 0 |
| May 26, 1968 | F1 | Clark | 0.2 | 0 |
| Jun 20, 1968 | F1 | Cameron | 0.2 | 0 |
| Jul 19, 1968 | F1 | Cheshire | 0.2 | 0 |
| Sep 15, 1968 | F1 | Calcasieu | 0.2 | 0 |
| Sep 5, 1968 | F1 | Cherokee | 0.2 | 0 |
| Oct 17, 1968 | F1 | Palm Beach | 0.1 | 0 |
| Nov 11, 1968 | F1 | Lake | 0.1 | 0 |
| Nov 17, 1968 | F1 | Smith | 0.1 | 0 |
| Nov 5, 1968 | F1 | Harris | 0.1 | 0 |
| Nov 9, 1968 | F1 | Pinellas | 0.1 | 0 |
| Nov 9, 1968 | F1 | Collier | 0.1 | 0 |
| Dec 18, 1968 | F1 | Jack | 0.1 | 0 |
| Dec 18, 1968 | F1 | Johnson | 0.1 | 0 |
| Dec 27, 1968 | F1 | Tarrant | 0.1 | 0 |
| Dec 27, 1968 | F1 | Marion | 0.1 | 0 |
| Dec 3, 1968 | F1 | Madison | 0.1 | 0 |
| Jan 23, 1968 | F1 | Pinellas | 0.1 | 0 |
| Feb 19, 1968 | F1 | Miami-Dade | 0.1 | 0 |
| Feb 23, 1968 | F1 | Palm Beach | 0.1 | 0 |
| Mar 22, 1968 | F1 | Okaloosa | 0.1 | 0 |
| Mar 22, 1968 | F1 | Holmes | 0.1 | 0 |
| Mar 22, 1968 | F1 | Jackson | 0.1 | 0 |
| Mar 22, 1968 | F1 | Henry | 0.1 | 0 |
| Apr 14, 1968 | F1 | DeKalb | 0.1 | 0 |
| Apr 14, 1968 | F1 | Tipton | 0.1 | 0 |
| Apr 16, 1968 | F1 | Atchison | 0.1 | 0 |
| Apr 19, 1968 | F1 | Grady | 0.1 | 0 |
| Apr 20, 1968 | F1 | Randolph | 0.1 | 0 |
| Apr 21, 1968 | F1 | Kingfisher | 0.1 | 0 |
| Apr 23, 1968 | F1 | Fulton | 0.1 | 0 |
| Apr 23, 1968 | F1 | DeKalb | 0.1 | 0 |
| Apr 26, 1968 | F1 | Randolph | 0.1 | 0 |
| Apr 3, 1968 | F1 | Dyer | 0.1 | 0 |
| Apr 4, 1968 | F1 | Lauderdale, Franklin | 0.1 | 0 |
| May 13, 1968 | F1 | Pushmataha | 0.1 | 0 |
| May 13, 1968 | F1 | Lee | 0.1 | 0 |
| May 13, 1968 | F1 | Nodaway | 0.1 | 0 |
| May 13, 1968 | F1 | Latimer | 0.1 | 0 |
| May 13, 1968 | F1 | Marshall | 0.1 | 0 |
| May 14, 1968 | F1 | Davidson | 0.1 | 0 |
| May 15, 1968 | F1 | Fulton | 0.1 | 0 |
| May 15, 1968 | F1 | Shelby | 0.1 | 0 |
| May 16, 1968 | F1 | Tate | 0.1 | 0 |
| May 16, 1968 | F1 | Shelby | 0.1 | 0 |
| May 16, 1968 | F1 | Marshall | 0.1 | 0 |
| May 16, 1968 | F1 | Shelby | 0.1 | 0 |
| May 16, 1968 | F1 | Clay | 0.1 | 0 |
| May 16, 1968 | F1 | Love | 0.1 | 0 |
| May 19, 1968 | F1 | Pinellas | 0.1 | 0 |
| May 23, 1968 | F1 | Ottawa | 0.1 | 0 |
| May 25, 1968 | F1 | Conway | 0.1 | 0 |
| May 25, 1968 | F1 | Shelby | 0.1 | 0 |
| May 25, 1968 | F1 | Davidson | 0.1 | 0 |
| May 26, 1968 | F1 | Williamson | 0.1 | 0 |
| May 27, 1968 | F1 | Escambia | 0.1 | 0 |
| May 28, 1968 | F1 | Nobles | 0.1 | 0 |
| May 31, 1968 | F1 | Swisher | 0.1 | 0 |
| May 2, 1968 | F1 | Comanche | 0.1 | 0 |
| May 6, 1968 | F1 | Harmon | 0.1 | 0 |
| May 6, 1968 | F1 | Greer | 0.1 | 0 |
| Jun 11, 1968 | F1 | Harrison | 0.1 | 0 |
| Jun 16, 1968 | F1 | Bailey | 0.1 | 0 |
| Jun 17, 1968 | F1 | Dawson | 0.1 | 0 |
| Jun 19, 1968 | F1 | Brevard | 0.1 | 0 |
| Jun 20, 1968 | F1 | Rice | 0.1 | 0 |
| Jun 21, 1968 | F1 | Holt | 0.1 | 0 |
| Jun 22, 1968 | F1 | Howard | 0.1 | 0 |
| Jun 23, 1968 | F1 | Wharton | 0.1 | 0 |
| Jun 23, 1968 | F1 | Wharton | 0.1 | 0 |
| Jun 23, 1968 | F1 | Wharton | 0.1 | 0 |
| Jun 23, 1968 | F1 | Laramie | 0.1 | 0 |
| Jun 23, 1968 | F1 | Hall | 0.1 | 0 |
| Jun 24, 1968 | F1 | Washington | 0.1 | 0 |
| Jun 29, 1968 | F1 | Tripp | 0.1 | 0 |
| Jun 29, 1968 | F1 | Tripp | 0.1 | 0 |
| Jun 5, 1968 | F1 | Polk | 0.1 | 0 |
| Jun 5, 1968 | F1 | Fremont | 0.1 | 0 |
| Jun 5, 1968 | F1 | Goshen | 0.1 | 0 |
| Jun 7, 1968 | F1 | Miami-Dade | 0.1 | 0 |
| Jun 9, 1968 | F1 | Hemphill | 0.1 | 0 |
| Jun 9, 1968 | F1 | Harper | 0.1 | 0 |
| Jul 12, 1968 | F1 | Craven | 0.1 | 0 |
| Jul 14, 1968 | F1 | Pinellas | 0.1 | 0 |
| Jul 17, 1968 | F1 | Comanche | 0.1 | 0 |
| Jul 20, 1968 | F1 | Maricopa | 0.1 | 0 |
| Jul 24, 1968 | F1 | Crawford | 0.1 | 0 |
| Jul 30, 1968 | F1 | Rock | 0.1 | 0 |
| Jul 2, 1968 | F1 | Yadkin | 0.1 | 0 |
| Jul 9, 1968 | F1 | Brevard | 0.1 | 0 |
| Aug 10, 1968 | F1 | Norfolk city | 0.1 | 0 |
| Aug 13, 1968 | F1 | Pasco | 0.1 | 0 |
| Aug 14, 1968 | F1 | Salt Lake | 0.1 | 0 |
| Aug 18, 1968 | F1 | Walsh | 0.1 | 0 |
| Aug 19, 1968 | F1 | Jefferson | 0.1 | 0 |
| Aug 20, 1968 | F1 | Litchfield | 0.1 | 0 |
| Aug 4, 1968 | F1 | Greene | 0.1 | 0 |
| Aug 5, 1968 | F1 | Walsh | 0.1 | 0 |
| Aug 7, 1968 | F1 | Hocking | 0.1 | 0 |
| Aug 9, 1968 | F1 | Bristol | 0.1 | 0 |
| Aug 9, 1968 | F1 | Barnstable | 0.1 | 0 |
| Aug 9, 1968 | F1 | Fairfield, Putnam | 0.1 | 0 |
| Sep 16, 1968 | F1 | Nueces | 0.1 | 0 |
| Sep 8, 1968 | F1 | Duval | 0.1 | 0 |
| Sep 9, 1968 | F1 | Bexar | 0.1 | 0 |
| Sep 12, 1968 | F0 | Miami-Dade | 42.8 | 0 |
| Aug 6, 1968 | F0 | Vernon | 14.9 | 0 |
| May 6, 1968 | F0 | Roberts, Gray | 12.3 | 0 |
| May 6, 1968 | F0 | Roberts, Gray | 12.3 | 0 |
| Oct 4, 1968 | F0 | Miami-Dade | 11.5 | 0 |
| Jun 8, 1968 | F0 | Lynn | 5.4 | 0 |
| Aug 6, 1968 | F0 | Crawford | 5.2 | 0 |
| Jul 17, 1968 | F0 | Carson, Gray | 4.5 | 0 |
| Aug 14, 1968 | F0 | Box Elder | 4.1 | 0 |
| May 13, 1968 | F0 | Marshall | 3.8 | 0 |
| Jul 17, 1968 | F0 | Carson, Gray | 3.8 | 0 |
| Aug 24, 1968 | F0 | Yoakum | 3.3 | 0 |
| Apr 16, 1968 | F0 | Cowley | 2.7 | 0 |
| Jul 14, 1968 | F0 | Otter Tail, Wadena, Cass | 2.2 | 0 |
| May 31, 1968 | F0 | Hockley | 2.0 | 0 |
| May 7, 1968 | F0 | Jefferson | 2.0 | 0 |
| May 7, 1968 | F0 | Wise | 2.0 | 0 |
| Jun 24, 1968 | F0 | Thomas | 2.0 | 0 |
| Aug 30, 1968 | F0 | Miami-Dade | 2.0 | 0 |
| Jul 8, 1968 | F0 | Cuming | 1.2 | 0 |
| Apr 8, 1968 | F0 | Williamson | 1.0 | 0 |
| May 17, 1968 | F0 | Smith | 1.0 | 0 |
| May 27, 1968 | F0 | Walworth | 1.0 | 0 |
| May 30, 1968 | F0 | Hartley | 1.0 | 0 |
| May 7, 1968 | F0 | Parker | 1.0 | 0 |
| Jun 14, 1968 | F0 | Ector | 1.0 | 0 |
| Jun 16, 1968 | F0 | Martin | 1.0 | 0 |
| Jun 17, 1968 | F0 | Mitchell | 1.0 | 0 |
| Jun 9, 1968 | F0 | Armstrong | 1.0 | 0 |
| Aug 24, 1968 | F0 | Yoakum | 1.0 | 0 |
| Aug 8, 1968 | F0 | Kalamazoo | 1.0 | 0 |
| May 17, 1968 | F0 | Van Zandt | 0.8 | 0 |
| Jul 28, 1968 | F0 | Houston | 0.6 | 0 |
| Mar 10, 1968 | F0 | Burnet | 0.5 | 0 |
| Mar 11, 1968 | F0 | Jackson | 0.5 | 0 |
| Mar 11, 1968 | F0 | Ouachita | 0.5 | 0 |
| Mar 30, 1968 | F0 | Jasper | 0.5 | 0 |
| May 10, 1968 | F0 | Hartley | 0.5 | 0 |
| May 11, 1968 | F0 | Galveston | 0.5 | 0 |
| May 29, 1968 | F0 | Knox | 0.5 | 0 |
| May 9, 1968 | F0 | Victoria | 0.5 | 0 |
| Jun 11, 1968 | F0 | Cooper | 0.5 | 0 |
| Jun 17, 1968 | F0 | Burleigh | 0.5 | 0 |
| Jun 24, 1968 | F0 | Texas | 0.5 | 0 |
| Jun 4, 1968 | F0 | Willacy | 0.5 | 0 |
| Jun 7, 1968 | F0 | Sherman | 0.5 | 0 |
| Jul 17, 1968 | F0 | Carson | 0.5 | 0 |
| Jul 17, 1968 | F0 | Callaway | 0.5 | 0 |
| Aug 6, 1968 | F0 | Vernon | 0.5 | 0 |
| Aug 6, 1968 | F0 | Monroe | 0.5 | 0 |
| Nov 26, 1968 | F0 | Atascosa | 0.4 | 0 |
| May 9, 1968 | F0 | Nueces | 0.4 | 0 |
| Jul 20, 1968 | F0 | Chatham | 0.4 | 0 |
| Dec 27, 1968 | F0 | Wood | 0.3 | 0 |
| Mar 12, 1968 | F0 | Ware | 0.3 | 0 |
| Apr 2, 1968 | F0 | Hall | 0.3 | 0 |
| Apr 3, 1968 | F0 | Arkansas | 0.3 | 0 |
| May 13, 1968 | F0 | Pontotoc | 0.3 | 0 |
| Jul 9, 1968 | F0 | Ozark | 0.3 | 0 |
| Sep 10, 1968 | F0 | Palm Beach | 0.3 | 0 |
| Oct 6, 1968 | F0 | Orange | 0.2 | 0 |
| Oct 8, 1968 | F0 | San Patricio | 0.2 | 0 |
| Dec 27, 1968 | F0 | Henderson | 0.2 | 0 |
| Jan 18, 1968 | F0 | Kerr | 0.2 | 0 |
| Mar 12, 1968 | F0 | Horry | 0.2 | 0 |
| Apr 27, 1968 | F0 | Appling | 0.2 | 0 |
| May 22, 1968 | F0 | Sumner | 0.2 | 0 |
| May 31, 1968 | F0 | Deaf Smith | 0.2 | 0 |
| May 3, 1968 | F0 | Titus | 0.2 | 0 |
| May 7, 1968 | F0 | Nueces | 0.2 | 0 |
| Aug 14, 1968 | F0 | Potter | 0.2 | 0 |
| Aug 1, 1968 | F0 | Cameron | 0.2 | 0 |
| Oct 13, 1968 | F0 | Washington | 0.1 | 0 |
| Oct 16, 1968 | F0 | Barber | 0.1 | 0 |
| Oct 8, 1968 | F0 | Crane | 0.1 | 0 |
| Oct 8, 1968 | F0 | Roberts | 0.1 | 0 |
| Oct 9, 1968 | F0 | Ochiltree | 0.1 | 0 |
| Nov 26, 1968 | F0 | Atascosa | 0.1 | 0 |
| Nov 26, 1968 | F0 | Frio | 0.1 | 0 |
| Nov 30, 1968 | F0 | Wilkinson | 0.1 | 0 |
| Nov 1, 1968 | F0 | Coconino | 0.1 | 0 |
| Nov 1, 1968 | F0 | Hale | 0.1 | 0 |
| Nov 5, 1968 | F0 | Harris | 0.1 | 0 |
| Dec 18, 1968 | F0 | Johnson | 0.1 | 0 |
| Dec 27, 1968 | F0 | Humphreys | 0.1 | 0 |
| Jan 24, 1968 | F0 | Polk | 0.1 | 0 |
| Mar 12, 1968 | F0 | Levy | 0.1 | 0 |
| Mar 30, 1968 | F0 | Poweshiek | 0.1 | 0 |
| Apr 16, 1968 | F0 | Kingfisher | 0.1 | 0 |
| Apr 20, 1968 | F0 | Mower | 0.1 | 0 |
| Apr 20, 1968 | F0 | Blue Earth | 0.1 | 0 |
| Apr 20, 1968 | F0 | Meeker | 0.1 | 0 |
| Apr 22, 1968 | F0 | Stonewall | 0.1 | 0 |
| Apr 22, 1968 | F0 | Kiowa | 0.1 | 0 |
| Apr 23, 1968 | F0 | Wayne | 0.1 | 0 |
| Apr 27, 1968 | F0 | Codington | 0.1 | 0 |
| Apr 27, 1968 | F0 | Navarro | 0.1 | 0 |
| Apr 28, 1968 | F0 | Lee | 0.1 | 0 |
| Apr 28, 1968 | F0 | Lee | 0.1 | 0 |
| May 10, 1968 | F0 | Austin | 0.1 | 0 |
| May 10, 1968 | F0 | Lea | 0.1 | 0 |
| May 11, 1968 | F0 | Atascosa | 0.1 | 0 |
| May 11, 1968 | F0 | Comal | 0.1 | 0 |
| May 12, 1968 | F0 | Galveston | 0.1 | 0 |
| May 15, 1968 | F0 | Freeborn | 0.1 | 0 |
| May 16, 1968 | F0 | Carter | 0.1 | 0 |
| May 16, 1968 | F0 | Love | 0.1 | 0 |
| May 16, 1968 | F0 | Cotton, Stephens | 0.1 | 0 |
| May 16, 1968 | F0 | Jefferson | 0.1 | 0 |
| May 19, 1968 | F0 | Jefferson | 0.1 | 0 |
| May 22, 1968 | F0 | Tooele | 0.1 | 0 |
| May 25, 1968 | F0 | Dallas | 0.1 | 0 |
| May 28, 1968 | F0 | Brevard | 0.1 | 0 |
| May 29, 1968 | F0 | Palm Beach | 0.1 | 0 |
| May 29, 1968 | F0 | Comanche | 0.1 | 0 |
| May 31, 1968 | F0 | Crosby | 0.1 | 0 |
| May 2, 1968 | F0 | Riley | 0.1 | 0 |
| May 3, 1968 | F0 | Beaver | 0.1 | 0 |
| May 6, 1968 | F0 | Chase | 0.1 | 0 |
| May 7, 1968 | F0 | Le Flore | 0.1 | 0 |
| May 8, 1968 | F0 | Kay | 0.1 | 0 |
| May 9, 1968 | F0 | Victoria | 0.1 | 0 |
| Jun 10, 1968 | F0 | Woodbury | 0.1 | 0 |
| Jun 11, 1968 | F0 | Genesee | 0.1 | 0 |
| Jun 11, 1968 | F0 | Bates | 0.1 | 0 |
| Jun 12, 1968 | F0 | Wood | 0.1 | 0 |
| Jun 12, 1968 | F0 | Harrison | 0.1 | 0 |
| Jun 13, 1968 | F0 | Big Horn | 0.1 | 0 |
| Jun 13, 1968 | F0 | Swift | 0.1 | 0 |
| Jun 13, 1968 | F0 | Chippewa | 0.1 | 0 |
| Jun 13, 1968 | F0 | Clay | 0.1 | 0 |
| Jun 13, 1968 | F0 | Carver | 0.1 | 0 |
| Jun 13, 1968 | F0 | Crow Wing | 0.1 | 0 |
| Jun 15, 1968 | F0 | Comanche | 0.1 | 0 |
| Jun 17, 1968 | F0 | Rawlins | 0.1 | 0 |
| Jun 20, 1968 | F0 | Winona | 0.1 | 0 |
| Jun 22, 1968 | F0 | Wallace | 0.1 | 0 |
| Jun 22, 1968 | F0 | Washington | 0.1 | 0 |
| Jun 22, 1968 | F0 | Sherman | 0.1 | 0 |
| Jun 22, 1968 | F0 | Knox | 0.1 | 0 |
| Jun 23, 1968 | F0 | Jasper | 0.1 | 0 |
| Jun 23, 1968 | F0 | St. Joseph | 0.1 | 0 |
| Jun 24, 1968 | F0 | Caldwell | 0.1 | 0 |
| Jun 24, 1968 | F0 | Wood | 0.1 | 0 |
| Jun 24, 1968 | F0 | Monona | 0.1 | 0 |
| Jun 24, 1968 | F0 | Monona | 0.1 | 0 |
| Jun 24, 1968 | F0 | Douglas | 0.1 | 0 |
| Jun 24, 1968 | F0 | Prowers | 0.1 | 0 |
| Jun 29, 1968 | F0 | Cherry | 0.1 | 0 |
| Jun 30, 1968 | F0 | Pine | 0.1 | 0 |
| Jun 3, 1968 | F0 | Tarrant | 0.1 | 0 |
| Jun 4, 1968 | F0 | Brevard | 0.1 | 0 |
| Jun 5, 1968 | F0 | Grady | 0.1 | 0 |
| Jun 6, 1968 | F0 | Ochiltree | 0.1 | 0 |
| Jun 7, 1968 | F0 | Charleston | 0.1 | 0 |
| Jun 7, 1968 | F0 | Stearns | 0.1 | 0 |
| Jun 8, 1968 | F0 | Stearns | 0.1 | 0 |
| Jun 9, 1968 | F0 | Campbell | 0.1 | 0 |
| Jun 9, 1968 | F0 | Ellis | 0.1 | 0 |
| Jun 9, 1968 | F0 | Texas | 0.1 | 0 |
| Jun 9, 1968 | F0 | Merrick | 0.1 | 0 |
| Jul 11, 1968 | F0 | Martin | 0.1 | 0 |
| Jul 11, 1968 | F0 | Baca | 0.1 | 0 |
| Jul 12, 1968 | F0 | Grant | 0.1 | 0 |
| Jul 14, 1968 | F0 | Otter Tail | 0.1 | 0 |
| Jul 16, 1968 | F0 | Adams | 0.1 | 0 |
| Jul 16, 1968 | F0 | Codington | 0.1 | 0 |
| Jul 17, 1968 | F0 | Stearns | 0.1 | 0 |
| Jul 17, 1968 | F0 | Wheeler | 0.1 | 0 |
| Jul 19, 1968 | F0 | Hampden | 0.1 | 0 |
| Jul 19, 1968 | F0 | Lee | 0.1 | 0 |
| Jul 20, 1968 | F0 | Coconino | 0.1 | 0 |
| Jul 24, 1968 | F0 | Cheyenne | 0.1 | 0 |
| Jul 26, 1968 | F0 | Cheyenne | 0.1 | 0 |
| Jul 26, 1968 | F0 | Morrill | 0.1 | 0 |
| Jul 27, 1968 | F0 | Ford | 0.1 | 0 |
| Jul 30, 1968 | F0 | Madison | 0.1 | 0 |
| Jul 3, 1968 | F0 | Teller | 0.1 | 0 |
| Jul 3, 1968 | F0 | Martin | 0.1 | 0 |
| Jul 7, 1968 | F0 | Hardee | 0.1 | 0 |
| Aug 14, 1968 | F0 | Roberts | 0.1 | 0 |
| Aug 16, 1968 | F0 | Cass | 0.1 | 0 |
| Aug 26, 1968 | F0 | Hall | 0.1 | 0 |
| Aug 4, 1968 | F0 | Hughes | 0.1 | 0 |
| Aug 4, 1968 | F0 | Sully | 0.1 | 0 |
| Aug 6, 1968 | F0 | Dewey | 0.1 | 0 |
| Aug 8, 1968 | F0 | Brazoria | 0.1 | 0 |
| Aug 9, 1968 | F0 | Charlotte | 0.1 | 0 |
| Sep 15, 1968 | F0 | Brazoria | 0.1 | 0 |
| Sep 22, 1968 | F0 | Sioux | 0.1 | 0 |
| Sep 22, 1968 | F0 | Sioux | 0.1 | 0 |
| Sep 2, 1968 | F0 | Natrona | 0.1 | 0 |
Tropical cyclones
Storms whose tracks came within 100 miles of a U.S. county.
Earthquakes
Magnitude 5 or more in the lower 48 and Hawaii, 6.5 or more in Alaska, strongest first.
| Apr 8, 1968 | 6.6 | Borrego Mountain, California San Diego CA |
| Apr 23, 1968 | 6.6 | near Halibut Cove, Alaska Kenai Peninsula AK |
| Jun 25, 1968 | 5.9 | near Shelter Cove, California Humboldt CA |
| Nov 9, 1968 | 5.3 | near Norris City, Illinois White IL |
| Apr 8, 1968 | 5.2 | near Ocotillo, CA San Diego CA |
| May 22, 1968 | 5.2 | near Rachel, Nevada Nye NV |
| May 29, 1968 | 5.1 | near Plush, Oregon Lake OR |
| Jun 26, 1968 | 5.1 | near Shelter Cove, California Humboldt CA |
| Feb 5, 1968 | 5.0 | near Dixon Lane-Meadow Creek, CA Esmeralda NV |
| Jun 3, 1968 | 5.0 | near Plush, Oregon Lake OR |
| Jul 4, 1968 | 5.0 | near Santa Cruz Is. (NW end), CA Santa Barbara CA |
Drought
On average 2% of lower-48 counties were in severe drought in 1968. The worst month was March 1968, with 5%.
Storm Prediction Center, National Hurricane Center HURDAT2, Monitoring Trends in Burn Severity, NOAA Storm Events Database, USGS Comprehensive Earthquake Catalog, NOAA nClimDiv Palmer Drought Severity Index. Damage is as reported at the time, not adjusted for inflation.