Janesville climate — normals and trends
Janesville (United States) has a hot-summer humid continental climate (Dfa) under the Köppen-Geiger classification. Its mean annual temperature is 8.7 °C and it receives 852 mm of precipitation per year.
These figures are normals computed over 86 complete calendar years, from 1940 to 2025, using ERA5 reanalysis data from the Copernicus programme.
The warmest month is July (22.5 °C on average) and the coldest is January (-6.9 °C). Rainfall peaks in June.
Janesville averages 132 frost days, 19 hot days (≥ 30 °C) and 113 rainy days per year.
Janesville has warmed by +2.0 °C between 1940 and 2025, or +0.24 °C per decade. This trend is statistically significant.
The number of frost days there went from about 144 to 120 per year over the period.
The hottest day of the period reached 38.1 °C (on 5 July 2012) and the coldest -33.8 °C (on 3 February 1996).
Data from ERA5 reanalysis (Copernicus Climate Change Service), redistributed under a CC-BY 4.0 licence. Normals are recomputed whenever the archive is updated.
Climate normals · ERA5
JanesvilleWisconsin
- coords
- 42.68°, -89.02°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
8.7°C
Average daily high
13.3°C
Average daily low
4.1°C
Annual rainfall
852mm
Sunshine / day
8.7h
Mean relative humidity
71%
Average peak wind
18.7km/h
Seasonal range
29.4°C
Frost days (< 0 °C)
132 d/yr
Hot days (≥ 30 °C)
19 d/yr
Rainy days (≥ 1 mm)
113 d/yr
Annual snowfall
82.7 cm
Average feels-like high
11.1 °C
Average feels-like low
1.0 °C
Average peak gust
37.9 km/h
Tropical nights (≥ 20 °C)
19 d/yr
Solar radiation
14.6 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+2.0 °C
since 1940
+0.2 °C per decade · r² = 0.38 · p = < 0.001
Trend fitted by linear regression (ordinary least squares) on annual means. A trend is shown only when it is statistically significant (p < 0.05).
A climograph overlays rainfall (bars) and temperature (line): the standard reading in climatology, where you can see at a glance whether the warm season is also the dry one.
Records for the period
Hottest day
38.1 °C
5 July 2012
Coldest day
-33.8 °C
3 February 1996
Wettest day
114 mm
13 September 1961
Windiest day
52.6 km/h
30 April 1984
Strongest gust
106.9 km/h
16 December 2021
Hottest feels-like
43.2 °C
13 July 1995
Coldest feels-like
-39.1 °C
3 February 1996
Snowiest day
24.5 cm
15 December 1987
Sunniest day
14.6 h
14 June 2024
Normals computed over complete calendar years 1940–2025.
A specific year
Pick a year and see how it compares to normal — warmer, drier or more extreme than usual?
Across the whole year
Month by month
| High | vs. normal | Precipitation | vs. normal | |
|---|---|---|---|---|
| Jan | -2.2 °C | +0.7 °C | 4 mm | -39 mm |
| Feb | -0.8 °C | -0.3 °C | 25 mm | -12 mm |
| Mar | 11.2 °C | +5.2 °C | 98 mm | +31 mm |
| Apr | 14.5 °C | +0.9 °C | 60 mm | -33 mm |
| May | 19.6 °C | -0.4 °C | 80 mm | -14 mm |
| Jun | 27.4 °C | +2.0 °C | 113 mm | +18 mm |
| Jul | 28.5 °C | +1.1 °C | 119 mm | +31 mm |
| Aug | 25.9 °C | -0.5 °C | 112 mm | +27 mm |
| Sep | 24.4 °C | +2.1 °C | 56 mm | -25 mm |
| Oct | 17.7 °C | +2.1 °C | 36 mm | -30 mm |
| Nov | 8.2 °C | +1.3 °C | 44 mm | -13 mm |
| Dec | -0.8 °C | -0.6 °C | 51 mm | +3 mm |
The year's extremes
What was the weather like that day?
Your birthday, a wedding, a memorable trip: discover the actual weather for any date since 1940.
Frequently asked questions
What is the climate of Janesville?
Janesville has a hot-summer humid continental climate (Köppen Dfa). Over 1940-2025, the average annual temperature is 8.7 °C and it receives 852 mm of precipitation per year.
What is the hottest day ever recorded in Janesville?
The hottest day measured in Janesville between 1940 and 2025 was 5 July 2012, reaching 38.1 °C.
What is the coldest day in Janesville?
The coldest day measured in Janesville between 1940 and 2025 was 3 February 1996, at -33.8 °C.
Does it snow in Janesville?
Yes. Janesville gets on average 82.7 cm of snow per year and has around 132 frost days.
Has the climate of Janesville warmed?
Yes: Janesville warmed by +2.0 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Janesville?
The wettest day measured in Janesville between 1940 and 2025 was 13 September 1961, with 114 mm of rain in 24 hours.
What was the windiest day in Janesville?
The windiest day measured in Janesville between 1940 and 2025 was 30 April 1984, with winds reaching 52.6 km/h.
What is the warmest month in Janesville?
The warmest month in Janesville is July (22.5 °C on average); the coldest is January (-6.9 °C).
How much does it rain in Janesville?
Janesville receives on average 852 mm of precipitation per year, spread over about 113 rainy days.
Is it sunny in Janesville?
Janesville gets on average 8.7 hours of sunshine per day, roughly 3,175 hours per year over 1940-2025.
What is the biggest single-day snowfall in Janesville?
The heaviest 24-hour snowfall measured in Janesville between 1940 and 2025 was 15 December 1987, with 24.5 cm.
Are there tropical nights in Janesville?
Yes: Janesville has on average 19 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Janesville?
In Janesville, between 1940 and 2025, the highest apparent temperature reached 43.2 °C on 13 July 1995, and the lowest was -39.1 °C on 3 February 1996.
Compare Janesville with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Janesville