NHC HURDAT2 · SPC Tornado Database
Hurricanes and Tornadoes That Hit Oconomowoc, WI
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
1 tropical system has passed within 75 miles of Oconomowoc, Wisconsin since 1851, 0 of them at hurricane strength; the most recent was an unnamed storm in 1900. Since 1950, 124 tornadoes have touched down within 25 miles, 3 of them rated EF3 or stronger.
- Hurricanes
- 0
- Tropical storms
- 1
- Tornadoes
- 124
- EF3 or stronger
- 3
within 75 mi, since 1851
below hurricane strength
within 25 mi, since 1950
5 deaths in all
What the records show for Oconomowoc
None of the 1 tropical systems was at hurricane strength as it passed Oconomowoc; the strongest was an unnamed storm in 1900, a tropical storm with 58 mph winds when its centre passed 33 miles away. Oconomowoc is tied for the most tropical storms and hurricanes within 75 miles among the 416 Wisconsin cities on this site. The strongest of the 124 tornadoes within 25 miles was an F4 on April 27, 1984; its path came within 11 miles, and it killed 1 person. The deadliest, an F2 on April 11, 1965, killed 3 people. Of the 124, 6 had paths within 5 miles of the city centre, and 49 have come since 2000. June has had the most tornadoes, 32. The most recent tornado was on July 16, 2025. Oconomowoc has more tornadoes within 25 miles than 90% of the 416 Wisconsin cities. Hail has been reported within 10 miles 124 times since 1969, with stones up to 3 inches (tea cup size). Oconomowoc has more hail reports within 10 miles than 87% of the 416 Wisconsin cities.
Compare Oconomowoc's storm record with another city →
Tropical storms and hurricanes near Oconomowoc
| Year | Storm | Closest | Strength when closest | Peak |
|---|---|---|---|---|
| 1900 | Unnamed 1900 stormSep 11 | 33 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 Oconomowoc: 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 Oconomowoc
By decade
- 2020s22
- 2010s13
- 2000s14
- 1990s7
- 1980s26(2 EF3+)
- 1970s17(1 EF3+)
- 1960s19
- 1950s6
| Date | Rating | Distance | Path | Killed / injured |
|---|---|---|---|---|
| Apr 27, 1984 | F4 | 11 mi | 6.5 mi | 1 / 14 |
| Jun 5, 1980 | F3 | 5 mi | 10.7 mi | 0 / 0 |
| Jun 5, 1977 | F3 | 12 mi | 69.5 mi | 0 / 8 |
| Apr 11, 1965 | F2 | 12 mi | 14.5 mi | 3 / 28 |
| Mar 27, 1991 | F2 | 17 mi | 32 mi | 1 / 5 |
| May 15, 2025 | EF2 | 23 mi | 11.48 mi | 0 / 1 |
| Feb 8, 2024 | EF2 | 24 mi | 25.9 mi | 0 / 1 |
| Jul 22, 2010 | EF2 | 22 mi | 1 mi | 0 / 0 |
| Jun 21, 2010 | EF2 | 17 mi | 5.22 mi | 0 / 15 |
| Jun 1, 2000 | F2 | 19 mi | 17 mi | 0 / 0 |
| May 8, 1988 | F2 | 21 mi | 27 mi | 0 / 0 |
| Sep 28, 1986 | F2 | 14 mi | 9 mi | 0 / 1 |
The strongest 12 of 124, by rating and then by deaths. Ratings before February 2007 are on the original Fujita scale.
Hail in Oconomowoc
The Storm Prediction Center has 124 hail reports within 10 miles of Oconomowoc since 1969, made on 63 separate days. Of these, 77 were 1 inch across or larger, and 8 reached 2 inches. The largest, 3 inches (tea cup size), fell on June 7, 2008. The most recent report is from May 15, 2025. May has the most reports, 36.
Source: NOAA Storm Prediction Center severe weather reports, data through 2025.
Weather by month in Oconomowoc
The nearest NOAA station with 1991–2020 climate normals is Oconomowoc Wwtp, WI, in Oconomowoc at 858 feet. July is the warmest, with an average high of 82°F and low of 61°F; January is the coolest, at 28°F and 11°F. June is the wettest at 4.9 inches of precipitation on average and February the driest at 1.6 inches; the year adds up to 36.9 inches over 72 days with at least a tenth of an inch. Highs reach 90°F on about 7 days a year, almost all from June to August. Lows fall below freezing on about 146 nights a year. Snowfall averages 39.6 inches a year, most of it in January. That 36.9 inches is more than at 126 of the 165 Wisconsin stations used on this site (76%). Dousman, 8 miles south, has its own station (Sullivan 3SE, WI): 37.8 inches a year, 0.9 more than here, and the same July average high, 82°F.
| Month | High °F | Low °F | Precip. in | Days ≥ 0.1" | Snow in |
|---|---|---|---|---|---|
| Jan | 28 | 11 | 1.7 | 5 | 11.1 |
| Feb | 32 | 14 | 1.6 | 4 | 9.8 |
| Mar | 44 | 25 | 2.1 | 5 | 4.8 |
| Apr | 56 | 36 | 3.9 | 7 | 2.0 |
| May | 69 | 47 | 4.1 | 8 | 0.2 |
| Jun | 78 | 57 | 4.9 | 7 | 0.0 |
| Jul | 82 | 61 | 4.1 | 6 | 0.0 |
| Aug | 81 | 60 | 4.2 | 7 | 0.0 |
| Sep | 74 | 52 | 3.4 | 6 | 0.0 |
| Oct | 61 | 40 | 2.8 | 6 | 0.1 |
| Nov | 46 | 29 | 2.2 | 5 | 1.4 |
| Dec | 34 | 18 | 1.9 | 5 | 10.2 |
| Year | 57 | 37 | 36.9 | 72 | 39.6 |
Averages for 1991–2020 at Oconomowoc Wwtp, WI (858 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 Oconomowoc
Since 1996, the National Weather Service has logged 154 flood, rain, thunderstorm wind and lightning events that began within 10 miles of Oconomowoc: 131 thunderstorm wind reports, 8 lightning strikes, 6 floods, 5 flash floods and 4 heavy rain events. They killed 1 person and injured 3, and the NWS estimated $11.4 million in property and crop damage. The strongest thunderstorm gust on record here was 81 mph, on September 2, 2010. June has had the most flash floods, 3 of 5. Of the 374 Wisconsin cities on this site with a flash flood on record, 168 have had fewer than Oconomowoc.
June 12, 2008: flash flood 10 miles from the centre of Oconomowoc — 1 killed, $25,000 damage.
June 15, 1997: thunderstorm wind 6 miles from the centre of Oconomowoc — 1 injured, $3,000 damage.
June 17, 2001: thunderstorm wind 5 miles from the centre of Oconomowoc — 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
Flood insurance policyholders in Oconomowoc's ZIP code 53066 have filed 37 claims with the National Flood Insurance Program since 1982, and were paid $565,000 for buildings and contents, in the dollars of each year. The most came from Storm in 2008: 13 claims (35% of all) and $261,000. 57% of the claims carry the name of a storm or flood event; the rest have no event name. Of the 128 Wisconsin cities on this site with 10 or more claims, 80 have fewer than Oconomowoc.
| Event | Claims | Paid |
|---|---|---|
| Storm2008 | 13 | $261,000 |
Waukesha County, which includes Oconomowoc, has been named in 19 federal disaster or emergency declarations since 1969, 14 of them major disasters (by incident: 7 floods, 6 severe storms, 2 biological emergencies, 2 snowstorms). The latest major disaster declaration was Severe Storms, Tornadoes, and Flooding, on June 30, 2026. FEMA's National Risk Index gives Waukesha County a Relatively Moderate rating for natural hazard risk overall; by hazard: Relatively High for tornadoes and hail; Relatively Moderate for inland flooding, strong wind, lightning and heat waves; Very Low for hurricanes. It models the county's expected loss from all 18 hazards it covers at $138.3 million a year, the 3rd highest of 72 Wisconsin counties; of the hazards above, the largest share, $68.2 million (49%), 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.