Oconomowoc, WI
Climate overview — based on NOAA 1991-2020 normals from OCONOMOWOC WWTP, WI US.
Year-round temperatures (°F)
Climate summary
Oconomowoc has an annual average temperature of 47.2°F with about 36.8 inches of precipitation per year and 39.6 inches of snow. The warmest month is July (average high 82.3°F), and the coldest is January (average low 11.1°F). June is typically the wettest month (4.86 in) and February the driest (1.61 in). Snow typically falls from November through May.
Best time to visit Oconomowoc
Full guide →Climate change signal
All-time records →57 of 366 (15.6%) of Oconomowoc's all-time daily heat records have been set since 2015. If records were spread evenly across the station's history, only about 5% would fall in any given decade.
| 1890s | 26 | |
| 1940s | 47 | |
| 1950s | 35 | |
| 1960s | 27 | |
| 1970s | 26 | |
| 1980s | 44 | |
| 1990s | 34 | |
| 2000s | 39 | |
| 2010s | 54 | |
| 2020s | 34 |
Bars: number of all-time daily heat records still standing that were set in each decade.
Monthly averages
| Month | Avg High | Avg Low | Avg Temp | Precipitation | Snow | Rainy days |
|---|---|---|---|---|---|---|
| January | 28.1°F | 11.1°F | 19.6°F | 1.65 in | 11.1 in | 11 |
| February | 32.0°F | 14.0°F | 23.0°F | 1.61 in | 9.8 in | 10 |
| March | 43.7°F | 24.6°F | 34.2°F | 2.10 in | 4.8 in | 10 |
| April | 56.4°F | 35.8°F | 46.1°F | 3.86 in | 2.0 in | 12 |
| May | 68.6°F | 47.2°F | 57.9°F | 4.14 in | 0.2 in | 13 |
| June | 78.4°F | 57.0°F | 67.7°F | 4.86 in | — | 12 |
| July | 82.3°F | 61.2°F | 71.8°F | 4.12 in | — | 10 |
| August | 80.6°F | 59.7°F | 70.2°F | 4.17 in | — | 10 |
| September | 73.8°F | 51.6°F | 62.7°F | 3.39 in | — | 10 |
| October | 60.8°F | 39.8°F | 50.3°F | 2.83 in | 0.1 in | 11 |
| November | 46.0°F | 28.6°F | 37.3°F | 2.21 in | 1.4 in | 10 |
| December | 33.7°F | 18.0°F | 25.9°F | 1.87 in | 10.2 in | 11 |
Climate twins of Oconomowoc
Why these? →The most climatically similar US cities at least 140 miles away (by monthly temperature + precipitation pattern).