Onalaska climate — normals and trends
Onalaska (United States) has a hot-summer humid continental climate (Dfa) under the Köppen-Geiger classification. Its mean annual temperature is 7.8 °C and it receives 863 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 (-8.8 °C). Rainfall peaks in June.
Onalaska averages 140 frost days, 17 hot days (≥ 30 °C) and 110 rainy days per year.
Onalaska has warmed by +1.9 °C between 1940 and 2025, or +0.23 °C per decade. This trend is statistically significant.
The number of frost days there went from about 149 to 131 per year over the period.
The hottest day of the period reached 38.4 °C (on 16 August 1988) and the coldest -37.3 °C (on 30 January 1951).
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
OnalaskaWisconsin
- coords
- 43.88°, -91.24°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
7.8°C
Average daily high
12.6°C
Average daily low
3.2°C
Annual rainfall
863mm
Sunshine / day
8.7h
Mean relative humidity
70%
Average peak wind
17.5km/h
Seasonal range
31.1°C
Frost days (< 0 °C)
140 d/yr
Hot days (≥ 30 °C)
17 d/yr
Rainy days (≥ 1 mm)
110 d/yr
Annual snowfall
91.0 cm
Average feels-like high
10.3 °C
Average feels-like low
0.2 °C
Average peak gust
37.6 km/h
Tropical nights (≥ 20 °C)
16 d/yr
Solar radiation
14.3 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+1.9 °C
since 1940
+0.2 °C per decade · r² = 0.33 · 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
38.4 °C
16 August 1988
Coldest day
-37.3 °C
30 January 1951
Wettest day
95 mm
1 June 2000
Windiest day
50.3 km/h
5 May 1950
Strongest gust
126.0 km/h
13 April 1964
Hottest feels-like
42.6 °C
5 July 2012
Coldest feels-like
-42.6 °C
30 January 1951
Snowiest day
28.5 cm
18 November 1957
Sunniest day
15.0 h
21 June 2023
Normals computed over complete calendar years 1940–2025.
A specific year
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Across the whole year
Month by month
| High | vs. normal | Precipitation | vs. normal | |
|---|---|---|---|---|
| Jan | -3.5 °C | +0.9 °C | 3 mm | -28 mm |
| Feb | -2.2 °C | -0.8 °C | 20 mm | -10 mm |
| Mar | 10.6 °C | +5.5 °C | 123 mm | +60 mm |
| Apr | 14.0 °C | +0.7 °C | 114 mm | +24 mm |
| May | 20.3 °C | +0.4 °C | 80 mm | -23 mm |
| Jun | 25.9 °C | +0.9 °C | 113 mm | +3 mm |
| Jul | 28.0 °C | +0.7 °C | 129 mm | +34 mm |
| Aug | 25.3 °C | -0.7 °C | 88 mm | -8 mm |
| Sep | 23.9 °C | +2.3 °C | 67 mm | -21 mm |
| Oct | 17.0 °C | +2.1 °C | 28 mm | -36 mm |
| Nov | 7.5 °C | +1.9 °C | 58 mm | +4 mm |
| Dec | -2.5 °C | -0.7 °C | 45 mm | +7 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 Onalaska?
Onalaska has a hot-summer humid continental climate (Köppen Dfa). Over 1940-2025, the average annual temperature is 7.8 °C and it receives 863 mm of precipitation per year.
What is the hottest day ever recorded in Onalaska?
The hottest day measured in Onalaska between 1940 and 2025 was 16 August 1988, reaching 38.4 °C.
What is the coldest day in Onalaska?
The coldest day measured in Onalaska between 1940 and 2025 was 30 January 1951, at -37.3 °C.
Does it snow in Onalaska?
Yes. Onalaska gets on average 91.0 cm of snow per year and has around 140 frost days.
Has the climate of Onalaska warmed?
Yes: Onalaska warmed by +1.9 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Onalaska?
The wettest day measured in Onalaska between 1940 and 2025 was 1 June 2000, with 95 mm of rain in 24 hours.
What was the windiest day in Onalaska?
The windiest day measured in Onalaska between 1940 and 2025 was 5 May 1950, with winds reaching 50.3 km/h.
What is the warmest month in Onalaska?
The warmest month in Onalaska is July (22.3 °C on average); the coldest is January (-8.8 °C).
How much does it rain in Onalaska?
Onalaska receives on average 863 mm of precipitation per year, spread over about 110 rainy days.
Is it sunny in Onalaska?
Onalaska 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 Onalaska?
The heaviest 24-hour snowfall measured in Onalaska between 1940 and 2025 was 18 November 1957, with 28.5 cm.
Are there tropical nights in Onalaska?
Yes: Onalaska has on average 16 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Onalaska?
In Onalaska, between 1940 and 2025, the highest apparent temperature reached 42.6 °C on 5 July 2012, and the lowest was -42.6 °C on 30 January 1951.
Compare Onalaska with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Onalaska