Owatonna climate — normals and trends
Owatonna (United States) has a hot-summer humid continental climate (Dfa) under the Köppen-Geiger classification. Its mean annual temperature is 7.1 °C and it receives 871 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 (22.1 °C on average) and the coldest is January (-10.3 °C). Rainfall peaks in June.
Owatonna averages 149 frost days, 15 hot days (≥ 30 °C) and 108 rainy days per year.
Owatonna has warmed by +2.1 °C between 1940 and 2025, or +0.25 °C per decade. This trend is statistically significant.
The number of frost days there went from about 157 to 141 per year over the period.
The hottest day of the period reached 39.8 °C (on 31 July 1988) and the coldest -36.8 °C (on 2 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
OwatonnaMinnesota
- coords
- 44.08°, -93.23°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
7.1°C
Average daily high
11.9°C
Average daily low
2.4°C
Annual rainfall
871mm
Sunshine / day
8.8h
Mean relative humidity
72%
Average peak wind
23.0km/h
Seasonal range
32.4°C
Frost days (< 0 °C)
149 d/yr
Hot days (≥ 30 °C)
15 d/yr
Rainy days (≥ 1 mm)
108 d/yr
Annual snowfall
93.2 cm
Average feels-like high
9.1 °C
Average feels-like low
-1.2 °C
Average peak gust
41.2 km/h
Tropical nights (≥ 20 °C)
15 d/yr
Solar radiation
14.7 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+2.1 °C
since 1940
+0.3 °C per decade · r² = 0.32 · 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
39.8 °C
31 July 1988
Coldest day
-36.8 °C
2 February 1996
Wettest day
119 mm
28 August 1960
Windiest day
76.9 km/h
10 October 1949
Strongest gust
124.2 km/h
10 October 1949
Hottest feels-like
44.4 °C
6 July 1948
Coldest feels-like
-44.3 °C
2 February 1996
Snowiest day
23.7 cm
22 January 2018
Sunniest day
14.9 h
2 July 2025
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 | -3.9 °C | +2.3 °C | 3 mm | -24 mm |
| Feb | -3.1 °C | +0.5 °C | 14 mm | -13 mm |
| Mar | 10.0 °C | +6.6 °C | 91 mm | +30 mm |
| Apr | 14.2 °C | +1.3 °C | 100 mm | +10 mm |
| May | 20.5 °C | +0.7 °C | 64 mm | -49 mm |
| Jun | 25.6 °C | +0.8 °C | 195 mm | +73 mm |
| Jul | 27.3 °C | +0.4 °C | 129 mm | +31 mm |
| Aug | 25.1 °C | -0.7 °C | 152 mm | +47 mm |
| Sep | 23.9 °C | +2.3 °C | 55 mm | -32 mm |
| Oct | 17.0 °C | +2.1 °C | 47 mm | -13 mm |
| Nov | 7.5 °C | +2.4 °C | 55 mm | +7 mm |
| Dec | -2.7 °C | +0.3 °C | 36 mm | +1 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 Owatonna?
Owatonna has a hot-summer humid continental climate (Köppen Dfa). Over 1940-2025, the average annual temperature is 7.1 °C and it receives 871 mm of precipitation per year.
What is the hottest day ever recorded in Owatonna?
The hottest day measured in Owatonna between 1940 and 2025 was 31 July 1988, reaching 39.8 °C.
What is the coldest day in Owatonna?
The coldest day measured in Owatonna between 1940 and 2025 was 2 February 1996, at -36.8 °C.
Does it snow in Owatonna?
Yes. Owatonna gets on average 93.2 cm of snow per year and has around 149 frost days.
Has the climate of Owatonna warmed?
Yes: Owatonna warmed by +2.1 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Owatonna?
The wettest day measured in Owatonna between 1940 and 2025 was 28 August 1960, with 119 mm of rain in 24 hours.
What was the windiest day in Owatonna?
The windiest day measured in Owatonna between 1940 and 2025 was 10 October 1949, with winds reaching 76.9 km/h.
What is the warmest month in Owatonna?
The warmest month in Owatonna is July (22.1 °C on average); the coldest is January (-10.3 °C).
How much does it rain in Owatonna?
Owatonna receives on average 871 mm of precipitation per year, spread over about 108 rainy days.
Is it sunny in Owatonna?
Owatonna gets on average 8.8 hours of sunshine per day, roughly 3,212 hours per year over 1940-2025.
What is the biggest single-day snowfall in Owatonna?
The heaviest 24-hour snowfall measured in Owatonna between 1940 and 2025 was 22 January 2018, with 23.7 cm.
Are there tropical nights in Owatonna?
Yes: Owatonna has on average 15 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Owatonna?
In Owatonna, between 1940 and 2025, the highest apparent temperature reached 44.4 °C on 6 July 1948, and the lowest was -44.3 °C on 2 February 1996.
Compare Owatonna with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Owatonna