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July is the hottest month in Madison WI, with an average high of 82°F / 28°C; January is the coldest (27°F / -3°C). June is the wettest month, averaging 5.3 in / 134 mm of precipitation.
| Month | High °F / °C | Low °F / °C | Precip in / mm | Wet days |
|---|---|---|---|---|
| Jan | 27 / -3 | 12 / -11 | 1.5 / 37 | 7 |
| Feb | 31 / 0 | 15 / -9 | 1.5 / 39 | 6 |
| Mar | 44 / 7 | 25 / -4 | 2.2 / 57 | 8 |
| Apr | 57 / 14 | 36 / 2 | 3.8 / 96 | 9 |
| May | 69 / 21 | 47 / 8 | 4.1 / 104 | 10 |
| Jun | 79 / 26 | 57 / 14 | 5.3 / 134 | 9 |
| Jul | 82 / 28 | 62 / 16 | 4.5 / 115 | 8 |
| Aug | 80 / 27 | 59 / 15 | 4.2 / 106 | 8 |
| Sep | 73 / 23 | 51 / 11 | 3.4 / 87 | 7 |
| Oct | 60 / 16 | 40 / 4 | 2.8 / 70 | 7 |
| Nov | 45 / 7 | 29 / -2 | 2.2 / 56 | 7 |
| Dec | 33 / 0 | 18 / -8 | 1.6 / 41 | 7 |
Extremes since 1939: highest 104°F / 40°C (July 10, 1976), lowest -37°F / -38°C (January 30, 1951).
Daylight lasts about 15.2 hours in June and 8.8 hours in December.
Data: Meteostat — Madison Dane County Rgnl, 1991–2020 averages.
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