Franklin County

Every recorded tornado

1. Injuries and deaths are for the tornado’s whole path, which may extend beyond the county. Deaths recorded within Franklin County: 0.
2. Weak tornadoes were under-recorded before Doppler radar coverage became national in the early 1990s, so earlier decades read low. Ratings use the Fujita scale before February 2007 and the Enhanced Fujita scale after.

Storm Prediction Center severe weather database, 1950 to 2025.

Smoke overhead

1. A smoke day is a date on which a smoke plume traced by NOAA Hazard Mapping System analysts from satellite imagery covered this place's point (the county's population centre or the city centre). Counts here are of medium or heavy smoke. Since 2018 analysts have often drawn light smoke as one area over most of the continent, so light-smoke counts are not comparable from year to year. The plumes show smoke anywhere in the air above, not air quality at the ground, and smoke hidden by cloud is missed.

NOAA Hazard Mapping System smoke analysis, 2011 to 2026, retrieved October 30, 2026.

This product uses the Federal Emergency Management Agency's OpenFEMA API, but is not endorsed by FEMA. The Federal Government or FEMA cannot vouch for the data or analyses derived from these data after the data have been retrieved from the Agency's website(s).

OpenFEMA NFIP Redacted Claims v3, refreshed August 4, 2026. NOAA Storm Events through 2026.

1. The Palmer Drought Severity Index is computed by NOAA each month from the county's average temperature and precipitation, relative to the county's own climate. Zero is normal; -3 or lower is severe drought and -4 or lower extreme drought. It describes the long-term balance of moisture, not water supply or crop losses.

NOAA NCEI nClimDiv county Palmer Drought Severity Index, 1895 to September 2026, issued October 6, 2026.

Costliest events since 1996

1. Jun 19, 2014Flash Flood$25.0 million
   National Weather Service narrative

   Numerous dirt roads were washed out and were under water in various portions of Franklin county.

2. Aug 1, 2003Drought, Franklin$12.7 million
   National Weather Service narrative

   Dry weather settled in over Iowa during the month. The last widespread rain occurred on 09 July. With the increasingly dry conditions became a primary concern as the month progressed. An extended period of heat and humidity from the 15th to 25th saw highs into the 90s to over 100 degrees F. in some locations. By month's end drought indices had worsened to severe to extreme drought across south central Iowa and at least moderate drought over the remainder of the HSA. Waterloo had its driest August on record, Des Moines its 3rd driest and Ottumwa its 8th driest. A cold front brought only a brief respite from the intense heat, as temperatures rebounded into the 90s to near 100…

3. Dec 23, 2009Ice Storm, Franklin$500,000
   National Weather Service narrative

   Part 1 of 2: A major winter storm system affected the central U.S. during Christmas week. There were two upper level systems involved with this storm. The southern stream low dove into the southern U.S. and then turned northeast. The turn was sharper than is typical as the northern stream upper low pushed southeast. The southern stream and polar low interacted with each other, resulting in a Fuji Wara effect. The southern low turned north, then eventually northwest and moved from northern Louisiana into Iowa. This resulted in a considerable amount of warm air being drawn north over Iowa. Cold air remained in place at the surface due to an existing deep snow cover over most of the…

4. Jun 16, 2014Thunderstorm Wind$400,000
   National Weather Service narrative

   Swath of wind damage that began in far NE Wright County broadened and strengthened as it entered NW Franklin County. An EF1 tornado was embedded within this wind damage. Wind gusts of 70-80 mph were found in a 1 to 2 mile wide and 4 to 5 mile long corridor, with locally higher gusts over 100 mph. One house lost half of its roof and multiple outbuildings were destroyed. One hog confinement building disintegrated--its remnants scattered for over 2 miles to the south. Damage point is at the house that lost its roof. Hog building was 1.5 miles SE of this point.

5. Jun 12, 2013Tornado$300,000
   National Weather Service narrative

   The tornado heavily damaged several farms while the rear flank downdraft winds produced an even wider damage path to the south of the tornado.

6. Nov 10, 1998High Wind, Franklin$300,000
   National Weather Service narrative

   Iowa experienced the worst November storm system since the great storm of 9 and 10 November 1975. During the 9th, low pressure developed over southeast Colorado. The low moved across Kansas during the afternoon and evening of the 9th and deepened to about 990 mb. Warm and moist air was drawn north ahead of the low resulting in widespread across the state. Thunderstorms erupted during the late evening of the 9th, though no severe weather occurred. During the predawn hours of the 10th, a jet streak rotated around the base of the upper level low pressure area. The jet stream, combined with a tropospheric fold, resulted in explosive deepening of the low. As the low moved through…

7. Feb 24, 2007Winter Storm, Franklin$250,000
   National Weather Service narrative

   A major winter storm affected Iowa through the 24th and 25th of February. A powerful upper low moved onto the west coast during the middle of the week, and advanced east through the Rockies during the end of the week. Strong warm air advection took place over the top of a shallow polar airmass that was in place over Iowa. The east-southeasterly flow at the surface drew cool and dry air into the state from the east, setting the stage for a significant ice storm. The main area of precipitation overspread the state during the early morning hours of the 24th and persisted through much of the 25th. Initially, very warm air aloft meant that the precipitation fell in the form of freezing…

8. Dec 15, 2021Tornado$250,000
   National Weather Service narrative

   This tornado began a few miles north of Geneva and moved northeast producing plenty of tree damage as well as extensive outbuilding damage on two farmsteads. Additional damage to a home with missing roofing and siding occurred along 170th Street west of Yarrow Avenue. The tornado continue producing tree and power pole damage to the northeast before lifting on the north side of 190th Street near the West Fork Wildlife Area.

9. Jun 16, 2014Thunderstorm Wind$225,000
   National Weather Service narrative

   Large tree limbs down throughout the city. Empty grain bin on the east side of the town blown down.

10. Mar 17, 2019Flash Flood$200,000
    National Weather Service narrative

    Emergency manager reported an ice jam in Iowa Falls has caused rapid rises along the Iowa river. This backed up portions of the river flooding low lying areas and roads across southwestern portions of the county.

1. Storm Events records before 1996 cover only tornadoes, thunderstorm wind and hail. Damage figures are as reported by the National Weather Service at the time, not adjusted for inflation.

NOAA NCEI Storm Events Database, 1950 to 2026, issued October 26, 2026.

All-time high

109°F2 times, most recently Jul 24, 1901

All-time low

−35°FMar 1, 1962

Warmest night

79°F3 times, most recently Jul 19, 2011

Coldest day

−17°FJan 20, 1985

Wettest day

6.47 inJul 17, 1968

Snowiest day

12.0 in2 times, most recently Nov 21, 2015

Hottest year

1931mean 52.4°F

Coldest year

1996mean 42.9°F

Wettest year

201854.77 in

Driest year

198920.10 in

Snowiest season

73.7 in1961-62

Station Hampton (USC00133584), 1,105 ft elevation, 1.9 miles from the population centre. Daily records from 1893 to October 27, 2026; 96.6% of days in the last 30 years are complete. Records at a single station can differ from a city’s official threaded record, which may combine several stations.

NOAA NCEI Global Historical Climatology Network Daily.

This product uses the Federal Emergency Management Agency's OpenFEMA API, but is not endorsed by FEMA. The Federal Government or FEMA cannot vouch for the data or analyses derived from these data after the data have been retrieved from the Agency's website(s).

OpenFEMA Disaster Declarations Summaries, retrieved October 30, 2026. Statewide declarations are not listed.

Neighbouring counties

• Tornadoes NOAA Storm Prediction Center severe weather database, through 2025.
• Tropical cyclones NOAA National Hurricane Center HURDAT2 (Atlantic; Northeast and Central Pacific), through 2025.
• Wildfire USGS/USFS Monitoring Trends in Burn Severity, through 2026.
• Storm events NOAA NCEI Storm Events Database, through 2026.
• Flood insurance OpenFEMA NFIP Redacted Claims v3, refreshed August 4, 2026.
• Declarations OpenFEMA Disaster Declarations Summaries v2, retrieved October 30, 2026.
• Weather records NOAA NCEI Global Historical Climatology Network Daily, station USC00133584.
• River crests NOAA National Weather Service, National Water Prediction Service river gauges, retrieved October 30, 2026.
• Drought NOAA NCEI nClimDiv county Palmer Drought Severity Index, through September 2026.
• Smoke NOAA NESDIS Hazard Mapping System smoke analysis, retrieved October 30, 2026.
• Earthquakes USGS ANSS Comprehensive Earthquake Catalog (ComCat), retrieved October 30, 2026.

Joins, thresholds and known limits are set out in the methodology. Found an error? Report it. Page built October 30, 2026.