Superior climate — normals and trends
Superior (United States) has a warm-summer humid continental climate (Dfb) under the Köppen-Geiger classification. Its mean annual temperature is 4.9 °C and it receives 917 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 (20.3 °C on average) and the coldest is January (-11.5 °C). Rainfall peaks in June.
Superior averages 152 frost days, 1 hot days (≥ 30 °C) and 117 rainy days per year.
Superior has warmed by +1.4 °C between 1940 and 2025, or +0.17 °C per decade. This trend is statistically significant.
The number of frost days there went from about 161 to 143 per year over the period.
The hottest day of the period reached 33.5 °C (on 15 July 2006) and the coldest -36.8 °C (on 15 January 1972).
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
SuperiorWisconsin
- coords
- 46.72°, -92.10°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
4.9°C
Average daily high
7.8°C
Average daily low
2.3°C
Annual rainfall
917mm
Sunshine / day
8.6h
Mean relative humidity
75%
Average peak wind
23.9km/h
Seasonal range
31.8°C
Frost days (< 0 °C)
152 d/yr
Hot days (≥ 30 °C)
1 d/yr
Rainy days (≥ 1 mm)
117 d/yr
Annual snowfall
119.8 cm
Average feels-like high
4.7 °C
Average feels-like low
-1.9 °C
Average peak gust
36.1 km/h
Tropical nights (≥ 20 °C)
13 d/yr
Solar radiation
13.8 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+1.4 °C
since 1940
+0.2 °C per decade · r² = 0.18 · 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
33.5 °C
15 July 2006
Coldest day
-36.8 °C
15 January 1972
Wettest day
92 mm
16 July 1952
Windiest day
63.0 km/h
10 October 1949
Strongest gust
105.8 km/h
4 March 1985
Hottest feels-like
39.8 °C
30 July 1999
Coldest feels-like
-43.0 °C
15 January 1972
Snowiest day
40.2 cm
1 November 1991
Sunniest day
15.7 h
20 June 2003
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 | -7.9 °C | +0.4 °C | 13 mm | -17 mm |
| Feb | -6.9 °C | -0.4 °C | 22 mm | -6 mm |
| Mar | 2.1 °C | +3.0 °C | 61 mm | +6 mm |
| Apr | 5.9 °C | +1.0 °C | 120 mm | +34 mm |
| May | 11.6 °C | +0.5 °C | 56 mm | -45 mm |
| Jun | 17.0 °C | -1.1 °C | 151 mm | +41 mm |
| Jul | 21.5 °C | -1.6 °C | 166 mm | +71 mm |
| Aug | 21.9 °C | -1.1 °C | 39 mm | -67 mm |
| Sep | 19.0 °C | +0.5 °C | 73 mm | -33 mm |
| Oct | 14.2 °C | +2.5 °C | 33 mm | -55 mm |
| Nov | 4.9 °C | +1.6 °C | 49 mm | -21 mm |
| Dec | -4.5 °C | -0.6 °C | 40 mm | -4 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 Superior?
Superior has a warm-summer humid continental climate (Köppen Dfb). Over 1940-2025, the average annual temperature is 4.9 °C and it receives 917 mm of precipitation per year.
What is the hottest day ever recorded in Superior?
The hottest day measured in Superior between 1940 and 2025 was 15 July 2006, reaching 33.5 °C.
What is the coldest day in Superior?
The coldest day measured in Superior between 1940 and 2025 was 15 January 1972, at -36.8 °C.
Does it snow in Superior?
Yes. Superior gets on average 119.8 cm of snow per year and has around 152 frost days.
Has the climate of Superior warmed?
Yes: Superior warmed by +1.4 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Superior?
The wettest day measured in Superior between 1940 and 2025 was 16 July 1952, with 92 mm of rain in 24 hours.
What was the windiest day in Superior?
The windiest day measured in Superior between 1940 and 2025 was 10 October 1949, with winds reaching 63.0 km/h.
What is the warmest month in Superior?
The warmest month in Superior is July (20.3 °C on average); the coldest is January (-11.5 °C).
How much does it rain in Superior?
Superior receives on average 917 mm of precipitation per year, spread over about 117 rainy days.
Is it sunny in Superior?
Superior gets on average 8.6 hours of sunshine per day, roughly 3,139 hours per year over 1940-2025.
What is the biggest single-day snowfall in Superior?
The heaviest 24-hour snowfall measured in Superior between 1940 and 2025 was 1 November 1991, with 40.2 cm.
Are there tropical nights in Superior?
Yes: Superior has on average 13 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Superior?
In Superior, between 1940 and 2025, the highest apparent temperature reached 39.8 °C on 30 July 1999, and the lowest was -43.0 °C on 15 January 1972.
Compare Superior with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Superior