Hot-summer humid continental climate
Climate Janesville - Wisconsin
Annual high58ºF
Annual low37ºF
Precipitation35.15 inch
| Month | HighºF | LowºF | Precipinch | Snowinch |
|---|---|---|---|---|
| Jan | 28 | 11 | 1.37 | 11 |
| Feb | 33 | 15 | 1.43 | 9 |
| Mar | 45 | 26 | 1.96 | 4 |
| Apr | 58 | 37 | 3.45 | 1 |
| May | 70 | 47 | 3.77 | 0 |
| Jun | 80 | 57 | 4.36 | 0 |
| Jul | 83 | 61 | 3.78 | 0 |
| Aug | 81 | 59 | 4.47 | 0 |
| Sep | 74 | 50 | 3.31 | 0 |
| Oct | 61 | 38 | 2.93 | 0 |
| Nov | 46 | 29 | 2.44 | 2 |
| Dec | 32 | 15 | 1.88 | 9 |
- JanHigh 28ºFLow 11ºFPrecip 1.37 inch
- FebHigh 33ºFLow 15ºFPrecip 1.43 inch
- MarHigh 45ºFLow 26ºFPrecip 1.96 inch
- AprHigh 58ºFLow 37ºFPrecip 3.45 inch
- MayHigh 70ºFLow 47ºFPrecip 3.77 inch
- JunHigh 80ºFLow 57ºFPrecip 4.36 inch
- JulHigh 83ºFLow 61ºFPrecip 3.78 inch
- AugHigh 81ºFLow 59ºFPrecip 4.47 inch
- SepHigh 74ºFLow 50ºFPrecip 3.31 inch
- OctHigh 61ºFLow 38ºFPrecip 2.93 inch
- NovHigh 46ºFLow 29ºFPrecip 2.44 inch
- DecHigh 32ºFLow 15ºFPrecip 1.88 inch
Climate summary
What is the average weather in Janesville, Wisconsin?
Janesville experiences a humid continental climate, marked by very large seasonal temperature contrasts. Summers are warm and fairly wet, with August being the wettest month. Winters are cold and snowy, bringing significant snowfall, while January is typically the driest month overall. Precipitation is spread relatively evenly throughout the year, with winter moisture often arriving as snow.
Janesville weather averages
Annual high58ºF
Annual low37ºF
Precipitation35.15 inch
Snowfall36 inch
Daily normals Janesville - Wisconsin - January
| Day | HighºF | LowºF | Prec/ | Prec/ | Snow/ | Snow/ |
|---|---|---|---|---|---|---|
| Jan 1 | 28.1 | 11.8 | 0.04 | 0.04 | 0.31 | 0.31 |
| Jan 2 | 28.1 | 11.7 | 0.12 | 0.12 | 0.59 | 0.59 |
| Jan 3 | 28.0 | 11.6 | 0.16 | 0.16 | 0.91 | 0.91 |
| Jan 4 | 28.0 | 11.5 | 0.20 | 0.20 | 1.18 | 1.18 |
| Jan 5 | 28.0 | 11.4 | 0.24 | 0.24 | 1.50 | 1.50 |
| Jan 6 | 27.9 | 11.4 | 0.28 | 0.28 | 1.81 | 1.81 |
| Jan 7 | 27.9 | 11.3 | 0.31 | 0.31 | 2.09 | 2.09 |
| Jan 8 | 27.9 | 11.2 | 0.35 | 0.35 | 2.52 | 2.52 |
| Jan 9 | 27.9 | 11.2 | 0.43 | 0.43 | 2.80 | 2.80 |
| Jan 10 | 27.9 | 11.1 | 0.47 | 0.47 | 3.11 | 3.11 |
| Jan 11 | 27.9 | 11.1 | 0.51 | 0.51 | 3.50 | 3.50 |
| Jan 12 | 28.0 | 11.1 | 0.55 | 0.55 | 3.90 | 3.90 |
| Jan 13 | 28.0 | 11.0 | 0.59 | 0.59 | 4.29 | 4.29 |
| Jan 14 | 28.0 | 11.0 | 0.67 | 0.67 | 4.61 | 4.61 |
| Jan 15 | 28.0 | 11.0 | 0.71 | 0.71 | 5.00 | 5.00 |
| Jan 16 | 28.1 | 10.9 | 0.75 | 0.75 | 5.39 | 5.39 |
| Jan 17 | 28.1 | 10.9 | 0.79 | 0.79 | 5.79 | 5.79 |
| Jan 18 | 28.2 | 10.9 | 0.83 | 0.83 | 6.18 | 6.18 |
| Jan 19 | 28.2 | 10.9 | 0.87 | 0.87 | 6.61 | 6.61 |
| Jan 20 | 28.3 | 10.9 | 0.91 | 0.91 | 6.89 | 6.89 |
| Jan 21 | 28.3 | 11.0 | 0.94 | 0.94 | 7.20 | 7.20 |
| Jan 22 | 28.4 | 11.0 | 0.98 | 0.98 | 7.60 | 7.60 |
| Jan 23 | 28.5 | 11.0 | 1.02 | 1.02 | 7.91 | 7.91 |
| Jan 24 | 28.6 | 11.0 | 1.06 | 1.06 | 8.19 | 8.19 |
| Jan 25 | 28.7 | 11.1 | 1.10 | 1.10 | 8.58 | 8.58 |
| Jan 26 | 28.8 | 11.1 | 1.14 | 1.14 | 8.90 | 8.90 |
| Jan 27 | 28.9 | 11.2 | 1.18 | 1.18 | 9.29 | 9.29 |
| Jan 28 | 29.0 | 11.3 | 1.22 | 1.22 | 9.61 | 9.61 |
| Jan 29 | 29.1 | 11.4 | 1.30 | 1.30 | 10.00 | 10.00 |
| Jan 30 | 29.2 | 11.5 | 1.34 | 1.34 | 10.39 | 10.39 |
| Jan 31 | 29.3 | 11.6 | 1.38 | 1.38 | 10.79 | 10.79 |
Precipitation and snow add up through the month (/mo) and the year (/yr)
Weather history Janesville - May 2026
| Day | HighºF | LowºF | Precip.inch |
|---|---|---|---|
| May 1 | 54.0 | 37.0 | 0.12 |
| May 2 | 52.0 | 30.9 | T |
| May 3 | 57.9 | 32.0 | T |
| May 4 | 70.0 | 41.0 | T |
| May 5 | 81.0 | 45.0 | 0.00 |
| May 6 | 81.0 | 33.1 | 0.00 |
| May 7 | 55.0 | 30.9 | 0.00 |
| May 8 | 64.0 | 34.0 | 0.00 |
| May 9 | – | – | – |
| May 10 | – | – | – |
| May 11 | 64.9 | 39.9 | 0.00 |
| May 12 | 64.0 | 39.9 | 0.00 |
| May 13 | 75.0 | 45.0 | 0.01 |
| May 14 | 66.0 | 37.0 | 0.00 |
| May 15 | 73.0 | 43.0 | 0.00 |
| May 16 | 81.0 | 57.9 | 0.14 |
| May 17 | 84.0 | 60.1 | 0.00 |
| May 18 | 84.0 | 62.1 | 0.08 |
| May 19 | 81.0 | 64.0 | 0.11 |
| May 20 | 75.0 | 44.1 | 0.00 |
| May 21 | 66.9 | 44.1 | 0.00 |
| May 22 | 59.0 | 46.0 | 0.00 |
| May 23 | 70.0 | 50.0 | 0.00 |
| May 24 | 78.1 | 55.9 | 0.01 |
| May 25 | 81.0 | 53.1 | 0.00 |
| May 26 | 86.0 | 57.0 | 0.00 |
| May 27 | 90.0 | 57.0 | 0.00 |
| May 28 | 90.0 | 57.0 | 0.00 |
| May 29 | 82.0 | 46.9 | 0.00 |
| May 30 | – | – | – |
| May 31 | – | – | – |
The data for May 2026 is incomplete: some days or values are missing.
- –No data
- –Not yet observed or received
- TTrace, too small to measure
Observed extremes
- Highest max temperature90.0ºF · May 27
- Lowest max temperature52.0ºF · May 2
- Highest min temperature64.0ºF · May 19
- Lowest min temperature30.9ºF · May 2
Geo Janesville - Wisconsin
Location
- Country
- United States
- State
- Wisconsin
- County
- –
- City
- Janesville
- Zip Code
- 53545
- Elevation
- 837 ft
- Longitude
- -89.02
- Latitude
- 42.68
- ICAO
- –
- IATA
- –