NHC HURDAT2 · SPC Tornado Database
Hurricanes and Tornadoes That Hit Lemont, 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
3 tropical systems have passed within 75 miles of Lemont, Illinois since 1851, 0 of them at hurricane strength; the most recent was an unnamed storm in 1941. Since 1950, 203 tornadoes have touched down within 25 miles, 9 of them rated EF3 or stronger.
- Hurricanes
- 0
- Tropical storms
- 3
- Tornadoes
- 203
- EF3 or stronger
- 9
within 75 mi, since 1851
below hurricane strength
within 25 mi, since 1950
71 deaths in all
What the records show for Lemont
None of the 3 tropical systems was at hurricane strength as it passed Lemont; the strongest was an unnamed storm in 1900, a tropical storm with 58 mph winds when its centre passed 70 miles away. The record near Lemont begins with an unnamed storm in 1900; the most recent system was an unnamed storm in 1941, a tropical storm 68 miles away. Lemont has more tropical storms and hurricanes within 75 miles than 62% of the 548 Illinois cities on this site. The strongest of the 203 tornadoes within 25 miles was an F5 on August 28, 1990; its path came within 12 miles, and it killed 29 people. The deadliest, an F4 on April 21, 1967, killed 33 people. Of the 203, 7 had paths within 5 miles of the city centre, and 110 have come since 2000. July has had the most tornadoes, 48. The most recent tornado was on March 19, 2025. Lemont has more tornadoes within 25 miles than 97% of the 548 Illinois cities. Hail has been reported within 10 miles 228 times since 1956, with stones up to 2.5 inches (tennis ball size). Lemont has more hail reports within 10 miles than 89% of the 548 Illinois cities.
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Tropical storms and hurricanes near Lemont
| Year | Storm | Closest | Strength when closest | Peak |
|---|---|---|---|---|
| 1941 | Unnamed 1941 stormSep 25 | 68 mi | Tropical storm (44 mph) | Category 3 |
| 1932 | Unnamed 1932 stormSep 3 | 74 mi | Tropical storm (41 mph) | Category 1 |
| 1900 | Unnamed 1900 stormSep 11 | 70 mi | Tropical storm (58 mph) | Category 4 |
Strength is the sustained wind on the track at the closest point, which is not the wind felt in Lemont: a hurricane's worst winds sit within a few dozen miles of its centre, and inland cities are usually past that.
Tornadoes within 25 miles of Lemont
By decade
- 2020s70(1 EF3+)
- 2010s18
- 2000s22
- 1990s11(2 EF3+)
- 1980s21(1 EF3+)
- 1970s26(4 EF3+)
- 1960s23(1 EF3+)
- 1950s12
| Date | Rating | Distance | Path | Killed / injured |
|---|---|---|---|---|
| Aug 28, 1990 | F5 | 12 mi | 16.4 mi | 29 / 350 |
| Apr 21, 1967 | F4 | 8 mi | 15 mi | 33 / 500 |
| Jun 13, 1976 | F4 | in town | 3.3 mi | 2 / 23 |
| Jun 29, 1979 | F4 | 12 mi | 5.4 mi | 0 / 1 |
| Apr 27, 1984 | F3 | 11 mi | 9 mi | 1 / 5 |
| Jun 20, 2021 | EF3 | 4 mi | 17.6 mi | 0 / 11 |
| Mar 27, 1991 | F3 | 2 mi | 15 mi | 0 / 7 |
| Mar 12, 1976 | F3 | 10 mi | 22.6 mi | 0 / 3 |
| Jul 17, 1972 | F3 | 16 mi | 81.5 mi | 0 / 0 |
| Mar 12, 1976 | F2 | 17 mi | 15.1 mi | 2 / 66 |
| Nov 12, 1965 | F2 | 10 mi | 35.9 mi | 2 / 90 |
| Apr 6, 1972 | F2 | 9 mi | 6.8 mi | 1 / 22 |
The strongest 12 of 203, by rating and then by deaths. Ratings before February 2007 are on the original Fujita scale.
Hail in Lemont
The Storm Prediction Center has 228 hail reports within 10 miles of Lemont since 1956, made on 113 separate days. Of these, 139 were 1 inch across or larger, and 5 reached 2 inches. The largest, 2.5 inches (tennis ball size), fell on February 27, 2024. The most recent report is from August 16, 2025. May has the most reports, 43.
Source: NOAA Storm Prediction Center severe weather reports, data through 2025.
Weather by month in Lemont
The nearest NOAA station with 1991–2020 climate normals is Romeoville WFO, IL, 7 miles southwest of Lemont at 660 feet. July is the warmest, with an average high of 85°F and low of 65°F; January is the coolest, at 32°F and 16°F. May is the wettest at 4.8 inches of precipitation on average and February the driest at 2.0 inches; the year adds up to 41.3 inches over 76 days with at least a tenth of an inch. Highs reach 90°F on about 16 days a year, almost all from May to September. Lows fall below freezing on about 123 nights a year. Snowfall averages 33.2 inches a year, most of it in January. That 41.3 inches is more than at 99 of the 146 Illinois stations used on this site (68%). Darien, 5 miles north, has its own station (Wheaton 3 SE, IL): 40.1 inches a year, 1.2 less than here, and a July average high of 86°F against 85°F.
| Month | High °F | Low °F | Precip. in | Days ≥ 0.1" | Snow in |
|---|---|---|---|---|---|
| Jan | 32 | 16 | 2.2 | 5 | 10.6 |
| Feb | 36 | 20 | 2.0 | 5 | 8.7 |
| Mar | 49 | 30 | 2.7 | 6 | 4.2 |
| Apr | 61 | 40 | 4.1 | 8 | 0.9 |
| May | 72 | 50 | 4.8 | 9 | 0.0 |
| Jun | 82 | 60 | 4.7 | 8 | 0.0 |
| Jul | 85 | 65 | 4.5 | 7 | 0.0 |
| Aug | 83 | 63 | 4.4 | 7 | 0.0 |
| Sep | 76 | 55 | 3.3 | 6 | 0.0 |
| Oct | 64 | 44 | 3.7 | 6 | 0.1 |
| Nov | 49 | 32 | 2.7 | 5 | 1.2 |
| Dec | 37 | 22 | 2.2 | 5 | 7.5 |
| Year | 60 | 41 | 41.3 | 76 | 33.2 |
Averages for 1991–2020 at Romeoville WFO, IL (660 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 Lemont
Since 1996, the National Weather Service has logged 453 flood, rain, thunderstorm wind and lightning events that began within 10 miles of Lemont: 325 thunderstorm wind reports, 66 floods, 43 flash floods, 11 lightning strikes and 8 heavy rain events. They killed 4 people and injured 10, and the NWS estimated $266.1 million in property and crop damage. The strongest thunderstorm gust on record here was 96 mph, on August 4, 2008. August has had the most flash floods, 13 of 43. Of the 547 Illinois cities on this site with a flash flood on record, 461 have had fewer than Lemont.
July 28, 2016: lightning strike 8 miles from the centre of Lemont — 1 killed, 1 injured.
May 30, 2013: lightning strike 6 miles from the centre of Lemont — 1 killed.
September 3, 2018: lightning strike 7 miles from the centre of Lemont — 1 killed.
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
Flood insurance policyholders in Lemont's ZIP code 60439 have filed 14 claims with the National Flood Insurance Program since 1979, and were paid $79,000 for buildings and contents, in the dollars of each year. 36% of the claims carry the name of a storm or flood event; the rest have no event name. Of the 320 Illinois cities on this site with 10 or more claims, 34 have fewer than Lemont.
Cook County, which includes Lemont, has been named in 24 federal disaster or emergency declarations since 1967, 19 of them major disasters (by incident: 8 floods, 8 severe storms, 4 snowstorms, 2 biological emergencies). The latest major disaster declaration was Severe Storms, Tornadoes, Straight-Line Winds, and Floodng, on September 20, 2024. FEMA's National Risk Index gives Cook County a Very High rating for natural hazard risk overall; by hazard: Very High for tornadoes, inland flooding, strong wind, lightning and heat waves; Relatively High for hail; Relatively Low for coastal flooding; Very Low for hurricanes. It models the county's expected loss from all 18 hazards it covers at $2.42 billion a year, the highest of 102 Illinois counties; of the hazards above, the largest share, $1.10 billion (45%), 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 Lemont
- Darien, IL5 mi
- Homer Glen, IL5 mi
- Lockport, IL6 mi
- Bolingbrook, IL6 mi
- Woodridge, IL6 mi
- Romeoville, IL6 mi
- Willow Springs, IL7 mi
- Palos Park, IL7 mi
- Hinsdale, IL7 mi
- Clarendon Hills, IL7 mi
- Downers Grove, IL8 mi
- Orland Park, IL8 mi
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