NHC HURDAT2 · SPC Tornado Database
Hurricanes and Tornadoes That Hit Delavan, 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 Delavan, Illinois since records began in 1851. Since 1950, 174 tornadoes have touched down within 25 miles, 12 of them rated EF3 or stronger.
- Hurricanes
- 0
- Tropical storms
- 0
- Tornadoes
- 174
- EF3 or stronger
- 12
within 75 mi, since 1851
below hurricane strength
within 25 mi, since 1950
10 deaths in all
What the records show for Delavan
The highest rating among the 174 tornadoes within 25 miles is F4 or EF4, reached 2 times; the most recent, on November 17, 2013, came within 18 miles. The deadliest, an F1 on May 15, 1968, killed 4 people. Of the 174, 9 had paths within 5 miles of the city centre, and 89 have come since 2000. May has had the most tornadoes, 45. The most recent tornado was on December 28, 2025. Delavan has more tornadoes within 25 miles than 78% of the 548 Illinois cities on this site. Hail has been reported within 10 miles 62 times since 1975, with stones up to 3.75 inches. Of the 548 Illinois cities, 71% have more hail reports within 10 miles than Delavan.
Compare Delavan's storm record with another city →
Tornadoes within 25 miles of Delavan
By decade
- 2020s21
- 2010s18(1 EF3+)
- 2000s50(2 EF3+)
- 1990s32(3 EF3+)
- 1980s12
- 1970s24(2 EF3+)
- 1960s9(2 EF3+)
- 1950s8(2 EF3+)
| Date | Rating | Distance | Path | Killed / injured |
|---|---|---|---|---|
| Nov 17, 2013 | EF4 | 18 mi | 46.36 mi | 3 / 125 |
| May 5, 1977 | F4 | 17 mi | 7.3 mi | 0 / 2 |
| Jul 23, 1975 | F3 | 23 mi | 14 mi | 2 / 69 |
| Jun 27, 1951 | F3 | 8 mi | 18.2 mi | 1 / 15 |
| Aug 19, 2009 | EF3 | 24 mi | 24.27 mi | 0 / 19 |
| May 10, 2003 | F3 | 10 mi | 17.5 mi | 0 / 32 |
| Apr 19, 1996 | F3 | 11 mi | 9.4 mi | 0 / 0 |
| May 13, 1995 | F3 | 9 mi | 25 mi | 0 / 25 |
| May 9, 1995 | F3 | 21 mi | 50 mi | 0 / 6 |
| May 15, 1968 | F3 | 6 mi | 12.6 mi | 0 / 25 |
| Sep 14, 1965 | F3 | 25 mi | 6.6 mi | 0 / 30 |
| Aug 13, 1956 | F3 | 22 mi | 3.8 mi | 0 / 0 |
The strongest 12 of 174, by rating and then by deaths. Ratings before February 2007 are on the original Fujita scale.
Hail in Delavan
The Storm Prediction Center has 62 hail reports within 10 miles of Delavan since 1975, made on 46 separate days. Of these, 36 were 1 inch across or larger, and 3 reached 2 inches. The largest, 3.75 inches, fell on August 18, 2001. The most recent report is from March 19, 2025. May has the most reports, 17.
Source: NOAA Storm Prediction Center severe weather reports, data through 2025.
Weather by month in Delavan
The nearest NOAA station with 1991–2020 climate normals is Mason City 4SE, IL, 15 miles south of Delavan at 600 feet. July is the warmest, with an average high of 85°F and low of 65°F; January is the coolest, at 33°F and 16°F. July is the wettest at 5.1 inches of precipitation on average and December the driest at 1.7 inches; the year adds up to 39.3 inches over 69 days with at least a tenth of an inch. Highs reach 90°F on about 28 days a year, almost all from May to September. Lows fall below freezing on about 122 nights a year. Snowfall averages 12.9 inches a year, most of it in January. That 39.3 inches is more than at 63 of the 146 Illinois stations used on this site (43%). Tremont, 11 miles north, has its own station (Congerville 2NW, IL): 37.5 inches a year, 1.8 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 | 33 | 16 | 2.3 | 4 | 5.5 |
| Feb | 38 | 19 | 2.0 | 4 | 2.8 |
| Mar | 51 | 30 | 2.5 | 5 | 1.7 |
| Apr | 64 | 41 | 3.7 | 8 | 0.0 |
| May | 74 | 53 | 4.5 | 8 | 0.0 |
| Jun | 82 | 62 | 4.2 | 7 | 0.0 |
| Jul | 85 | 65 | 5.1 | 7 | 0.0 |
| Aug | 84 | 62 | 3.6 | 5 | 0.0 |
| Sep | 79 | 54 | 3.6 | 6 | 0.0 |
| Oct | 66 | 43 | 3.3 | 6 | 0.0 |
| Nov | 51 | 31 | 2.8 | 5 | 0.3 |
| Dec | 38 | 22 | 1.7 | 4 | 2.6 |
| Year | 62 | 41 | 39.3 | 69 | 12.9 |
Averages for 1991–2020 at Mason City 4SE, IL (600 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 Delavan
Since 1996, the National Weather Service has logged 104 flood, rain, thunderstorm wind and lightning events that began within 10 miles of Delavan: 90 thunderstorm wind reports, 12 flash floods and 2 floods. They killed 0 people and injured 7, and the NWS estimated $2.0 million in property and crop damage. The strongest thunderstorm gust on record here was 81 mph, on August 10, 2020. June has had the most flash floods, 5 of 12. Of the 547 Illinois cities on this site with a flash flood on record, 179 have had fewer than Delavan.
February 11, 1999: thunderstorm wind 3 miles from the centre of Delavan — 6 injured, $40,000 damage.
NWS: “Widespread damage occurred in Tazewell County. As the severe thunderstorm moved northeast across the county, it took the roof off of a corn crib and flipped over an irrigation rig 3 miles southwest of Delavan then blew the roof off of a house in Delavan.”
April 20, 2000: thunderstorm wind 6 miles from the centre of Delavan — 1 injured, $750,000 damage.
NWS: “As a line of severe thunderstorms raced across Logan County, extensive damage was reported in northern sections of the county from San Jose to Atlanta. In San Jose, a mobile home was blown off of its foundation.”
March 27, 1998: thunderstorm wind 5 miles from the centre of Delavan — $500,000 damage.
NWS: “A line of severe thunderstorms moved through Tazewell county. A 60 mph wind gust was recorded in Delavan and numerous trees & tree limbs were reported blown down in Green Valley, South Pekin, and Tremont.”
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
Tazewell County, which includes Delavan, has been named in 15 federal disaster or emergency declarations since 1973, 11 of them major disasters (by incident: 5 floods, 3 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 Tazewell County a Relatively Moderate rating for natural hazard risk overall; by hazard: Relatively High for tornadoes and strong wind; Relatively Moderate for hail, inland flooding, lightning and heat waves; Very Low for hurricanes. It models the county's expected loss from all 18 hazards it covers at $60.0 million a year, the 17th highest of 102 Illinois counties; of the hazards above, the largest share, $28.5 million (47%), 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 Delavan
- Tremont, IL11 mi
- Manito, IL14 mi
- Mason City, IL14 mi
- Pekin, IL14 mi
- Mackinaw, IL15 mi
- Atlanta, IL17 mi
- Morton, IL17 mi
- Lincoln, IL18 mi
- Creve Coeur, IL19 mi
- Mapleton, IL20 mi
- Bartonville, IL20 mi
- Glasford, IL21 mi
All Illinois cities →All hurricanes since 1851 →Compare Delavan with another place →