NHC HURDAT2 · SPC Tornado Database
Hurricanes and Tornadoes That Hit Mendon, IL
Every tropical system within 75 miles since 1851 and every tornado within 25 miles since 1950.
Data: NOAA NHC HURDAT2 and NOAA SPC tornado and hail reports, through 2025 · Updated
No tropical storm or hurricane has passed within 75 miles of Mendon, Illinois since records began in 1851. Since 1950, 70 tornadoes have touched down within 25 miles, 4 of them rated EF3 or stronger.
- Hurricanes
- 0
- Tropical storms
- 0
- Tornadoes
- 70
- EF3 or stronger
- 4
within 75 mi, since 1851
below hurricane strength
within 25 mi, since 1950
no recorded deaths
What the records show for Mendon
The highest rating among the 70 tornadoes within 25 miles is F3, reached 4 times; the most recent, on April 8, 1999, came within 20 miles. Of the 70, 6 had paths within 5 miles of the city centre, and 26 have come since 2000. April has had the most tornadoes, 20. The most recent tornado was on April 20, 2025. Of the 548 Illinois cities on this site, 97% have more tornadoes within 25 miles than Mendon. Hail has been reported within 10 miles 47 times since 1958, with stones up to 2.75 inches (baseball size). Of the 548 Illinois cities, 82% have more hail reports within 10 miles than Mendon.
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Tornadoes within 25 miles of Mendon
By decade
- 2020s4
- 2010s3
- 2000s19
- 1990s21(1 EF3+)
- 1980s5
- 1970s10(2 EF3+)
- 1960s4(1 EF3+)
- 1950s4
| Date | Rating | Distance | Path | Killed / injured |
|---|---|---|---|---|
| Apr 8, 1999 | F3 | 20 mi | 7.5 mi | 0 / 0 |
| Apr 13, 1974 | F3 | 17 mi | 11 mi | 0 / 0 |
| Sep 30, 1973 | F3 | 20 mi | 0.1 mi | 0 / 0 |
| May 14, 1961 | F3 | 16 mi | 127.1 mi | 0 / 8 |
| May 10, 2003 | F2 | 17 mi | 30.8 mi | 0 / 0 |
| May 10, 2003 | F2 | 10 mi | 69.2 mi | 0 / 4 |
| May 10, 2003 | F2 | 13 mi | 20 mi | 0 / 6 |
| Mar 8, 1990 | F2 | 18 mi | 42 mi | 0 / 0 |
| Sep 23, 1977 | F2 | 18 mi | 19.5 mi | 0 / 3 |
| May 30, 1974 | F2 | 3 mi | 15.8 mi | 0 / 12 |
| Apr 13, 1974 | F2 | 19 mi | 19.5 mi | 0 / 10 |
| Apr 13, 1974 | F2 | 18 mi | 4.3 mi | 0 / 0 |
The strongest 12 of 70, by rating and then by deaths. Ratings before February 2007 are on the original Fujita scale.
Hail in Mendon
The Storm Prediction Center has 47 hail reports within 10 miles of Mendon since 1958, made on 40 separate days. Of these, 28 were 1 inch across or larger, and 2 reached 2 inches. The largest size, 2.75 inches (baseball size), was reported on 2 days, most recently June 17, 1992. The most recent report is from April 20, 2023. May and June have the most reports, 11 each.
Source: NOAA Storm Prediction Center severe weather reports, data through 2025.
Weather by month in Mendon
The nearest NOAA station with 1991–2020 climate normals is Quincy Regional Airport, IL, 12 miles south of Mendon at 769 feet. July is the warmest, with an average high of 86°F and low of 67°F; January is the coolest, at 35°F and 19°F. May is the wettest at 4.6 inches of precipitation on average and January the driest at 1.6 inches; the year adds up to 36.6 inches over 64 days with at least a tenth of an inch. Highs reach 90°F on about 24 days a year, almost all from June to September. Lows fall below freezing on about 112 nights a year. That 36.6 inches is more than at 11 of the 146 Illinois stations used on this site (8%). Quincy, 11 miles south, has its own station (Quincy Dam 21, IL): 36.5 inches a year, the same as here, and a July average high of 87°F against 86°F.
| Month | High °F | Low °F | Precip. in | Days ≥ 0.1" |
|---|---|---|---|---|
| Jan | 35 | 19 | 1.6 | 3 |
| Feb | 40 | 23 | 1.8 | 3 |
| Mar | 52 | 32 | 2.3 | 5 |
| Apr | 64 | 43 | 4.0 | 8 |
| May | 73 | 54 | 4.6 | 8 |
| Jun | 82 | 63 | 4.5 | 7 |
| Jul | 86 | 67 | 3.5 | 6 |
| Aug | 85 | 65 | 3.9 | 5 |
| Sep | 78 | 56 | 3.1 | 5 |
| Oct | 65 | 45 | 3.1 | 6 |
| Nov | 51 | 33 | 2.4 | 5 |
| Dec | 39 | 24 | 1.8 | 4 |
| Year | 62 | 44 | 36.6 | 64 |
Averages for 1991–2020 at Quincy Regional Airport, IL (769 ft), from NOAA NCEI U.S. Climate Normals. Normals describe the station; the farther a place is from it, and the bigger the difference in height, the more its weather can differ.
Floods, thunderstorm wind and lightning near Mendon
Since 1996, the National Weather Service has logged 41 flood, rain, thunderstorm wind and lightning events that began within 10 miles of Mendon: 38 thunderstorm wind reports, 1 flash flood, 1 flood and 1 lightning strike. They killed 0 people and injured 1, and the NWS estimated $107,000 in property and crop damage. The strongest thunderstorm gust on record here was 90 mph, on April 17, 2013.
June 27, 2011: thunderstorm wind 7 miles from the centre of Mendon — 1 injured.
Source: NOAA NCEI Storm Events Database, events whose starting point is on record, 1996 to June 30, 2026. Damage is the NWS estimate in the dollars of the year, not insured losses, and NWS notes that some reports are unverified.
Flood insurance claims, disaster declarations and FEMA risk ratings
Adams County, which includes Mendon, has been named in 21 federal disaster or emergency declarations since 1965, 17 of them major disasters (by incident: 9 floods, 4 severe storms, 3 snowstorms, 2 biological emergencies). The latest major disaster declaration was Covid-19 Pandemic, on March 26, 2020. FEMA's National Risk Index gives Adams County a Relatively Low rating for natural hazard risk overall; by hazard: Relatively High for strong wind; Relatively Moderate for hail, lightning and heat waves; Relatively Low for tornadoes and inland flooding; Very Low for hurricanes. It models the county's expected loss from all 18 hazards it covers at $25.9 million a year, the 38th highest of 102 Illinois counties; of the hazards above, the largest share, $10.0 million (39%), is from inland flooding.
Claims: FEMA, OpenFEMA Dataset FIMA NFIP Redacted Claims – v3, summed over ZIP codes; payments in the dollars of each year, not adjusted for inflation. Declarations: Disaster Declarations Summaries – v2, by county. Retrieved October 25, 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).
Risk ratings: FEMA, National Risk Index county table, December 2025 (v1.20), retrieved October 26, 2026; ratings compare counties nationwide, are meant for planning and are no substitute for a local risk assessment. This product uses the Federal Emergency Management Agency's National Risk Index dataset API or downloadable datasets 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).
What counts as a pass, the distances and the sources: how this storm history is built.
Cities near Mendon
- Camp Point, IL11 mi
- Quincy, IL11 mi
- Liberty, IL17 mi
- Canton, MO17 mi
- Hamilton, IL22 mi
- Keokuk, IA23 mi
- Carthage, IL23 mi
- Palmyra, MO26 mi
- Hannibal, MO28 mi
- Mt Sterling, IL29 mi
- Kahoka, MO33 mi
- Colchester, IL33 mi
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