Historical Weather Records & Monthly Climate for Janesville, WI
All-Time High
100°F
All-Time Low
-33°F
Max Daily Snow
9.6"
Max Wind Gust
63 mph
Monthly Climate Averages
Based on 30 years of historical data (1994 - 2023)
| Month | High (°F) | Low (°F) | Precip (in) | Snow (in) |
|---|---|---|---|---|
| January | 28° | 13° | 1.75" | 7.64" |
| February | 32° | 16° | 1.83" | 6.96" |
| March | 45° | 27° | 2.4" | 4.49" |
| April | 56° | 38° | 3.85" | 2.25" |
| May | 68° | 50° | 3.95" | 0.03" |
| June | 78° | 60° | 4.23" | 0 |
| July | 81° | 65° | 3.46" | 0 |
| August | 80° | 64° | 3.52" | 0 |
| September | 73° | 57° | 3.27" | 0 |
| October | 60° | 45° | 2.94" | 0.29" |
| November | 46° | 32° | 2.06" | 1.97" |
| December | 34° | 21° | 2.06" | 7.41" |
Historical Weather Extremes
Based on 80+ years of archive data (1940 - 2024)
🔥
Longest Heatwave
10 Days
1953
Consecutive days ≥ 90°F
🧊
Deepest Freeze
51 Days
1979
Consecutive days ≤ 32°F
🏜️
Longest Drought
30 Days
1952
Consecutive days w/o rain
☔
Wettest Month
11.05"
September 1961
Most rainfall in one month
⛄
Snowiest Month
22.24"
December 2008
Most snowfall in one month
More Historical Climate Data for Cities in
WI