Waukesha climate — normals and trends
Waukesha (United States) has a hot-summer humid continental climate (Dfa) under the Köppen-Geiger classification. Its mean annual temperature is 8.5 °C and it receives 833 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 (22.3 °C on average) and the coldest is January (-6.6 °C). Rainfall peaks in April.
Waukesha averages 130 frost days, 18 hot days (≥ 30 °C) and 114 rainy days per year.
Waukesha 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 116 per year over the period.
The hottest day of the period reached 38.9 °C (on 14 July 1995) and the coldest -32.4 °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
WaukeshaWisconsin
- coords
- 43.01°, -88.23°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
8.5°C
Average daily high
13.1°C
Average daily low
4.2°C
Annual rainfall
833mm
Sunshine / day
8.7h
Mean relative humidity
70%
Average peak wind
18.8km/h
Seasonal range
28.9°C
Frost days (< 0 °C)
130 d/yr
Hot days (≥ 30 °C)
18 d/yr
Rainy days (≥ 1 mm)
114 d/yr
Annual snowfall
89.1 cm
Average feels-like high
10.8 °C
Average feels-like low
1.0 °C
Average peak gust
39.8 km/h
Tropical nights (≥ 20 °C)
19 d/yr
Solar radiation
14.5 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+2.0 °C
since 1940
+0.2 °C per decade · r² = 0.36 · 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
38.9 °C
14 July 1995
Coldest day
-32.4 °C
3 February 1996
Wettest day
109 mm
13 September 1961
Windiest day
53.4 km/h
30 April 1984
Strongest gust
109.8 km/h
30 April 1984
Hottest feels-like
43.9 °C
6 July 2012
Coldest feels-like
-39.5 °C
30 January 2019
Snowiest day
25.3 cm
15 December 1987
Sunniest day
14.8 h
20 June 2022
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 | +0.5 °C | 5 mm | -40 mm |
| Feb | -0.7 °C | -0.1 °C | 25 mm | -13 mm |
| Mar | 10.5 °C | +5.0 °C | 95 mm | +30 mm |
| Apr | 13.6 °C | +0.8 °C | 60 mm | -32 mm |
| May | 17.8 °C | -1.4 °C | 91 mm | +3 mm |
| Jun | 26.4 °C | +1.7 °C | 88 mm | -0 mm |
| Jul | 28.0 °C | +0.8 °C | 119 mm | +32 mm |
| Aug | 25.7 °C | -0.5 °C | 116 mm | +34 mm |
| Sep | 23.7 °C | +1.7 °C | 65 mm | -10 mm |
| Oct | 17.2 °C | +1.8 °C | 35 mm | -30 mm |
| Nov | 8.0 °C | +1.1 °C | 49 mm | -8 mm |
| Dec | -0.9 °C | -0.9 °C | 54 mm | +5 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 Waukesha?
Waukesha has a hot-summer humid continental climate (Köppen Dfa). Over 1940-2025, the average annual temperature is 8.5 °C and it receives 833 mm of precipitation per year.
What is the hottest day ever recorded in Waukesha?
The hottest day measured in Waukesha between 1940 and 2025 was 14 July 1995, reaching 38.9 °C.
What is the coldest day in Waukesha?
The coldest day measured in Waukesha between 1940 and 2025 was 3 February 1996, at -32.4 °C.
Does it snow in Waukesha?
Yes. Waukesha gets on average 89.1 cm of snow per year and has around 130 frost days.
Has the climate of Waukesha warmed?
Yes: Waukesha warmed by +2.0 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Waukesha?
The wettest day measured in Waukesha between 1940 and 2025 was 13 September 1961, with 109 mm of rain in 24 hours.
What was the windiest day in Waukesha?
The windiest day measured in Waukesha between 1940 and 2025 was 30 April 1984, with winds reaching 53.4 km/h.
What is the warmest month in Waukesha?
The warmest month in Waukesha is July (22.3 °C on average); the coldest is January (-6.6 °C).
How much does it rain in Waukesha?
Waukesha receives on average 833 mm of precipitation per year, spread over about 114 rainy days.
Is it sunny in Waukesha?
Waukesha 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 Waukesha?
The heaviest 24-hour snowfall measured in Waukesha between 1940 and 2025 was 15 December 1987, with 25.3 cm.
Are there tropical nights in Waukesha?
Yes: Waukesha has on average 19 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Waukesha?
In Waukesha, between 1940 and 2025, the highest apparent temperature reached 43.9 °C on 6 July 2012, and the lowest was -39.5 °C on 30 January 2019.
Compare Waukesha with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Waukesha