Wyoming climate — normals and trends
Wyoming (United States) has a hot-summer humid continental climate (Dfa) under the Köppen-Geiger classification. Its mean annual temperature is 8.9 °C and it receives 927 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 (22.0 °C on average) and the coldest is January (-4.8 °C). Rainfall peaks in May.
Wyoming averages 126 frost days, 14 hot days (≥ 30 °C) and 127 rainy days per year.
Wyoming has warmed by +2.2 °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 141 to 111 per year over the period.
The hottest day of the period reached 37.4 °C (on 20 June 1953) and the coldest -30.4 °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
WyomingMichigan
- coords
- 42.91°, -85.71°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
8.9°C
Average daily high
13.4°C
Average daily low
4.5°C
Annual rainfall
927mm
Sunshine / day
8.6h
Mean relative humidity
72%
Average peak wind
18.3km/h
Seasonal range
26.8°C
Frost days (< 0 °C)
126 d/yr
Hot days (≥ 30 °C)
14 d/yr
Rainy days (≥ 1 mm)
127 d/yr
Annual snowfall
97.2 cm
Average feels-like high
11.3 °C
Average feels-like low
1.5 °C
Average peak gust
39.2 km/h
Tropical nights (≥ 20 °C)
16 d/yr
Solar radiation
14.5 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+2.2 °C
since 1940
+0.3 °C per decade · r² = 0.43 · 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
37.4 °C
20 June 1953
Coldest day
-30.4 °C
3 February 1996
Wettest day
82 mm
28 June 1945
Windiest day
56.6 km/h
6 April 1979
Strongest gust
108.4 km/h
30 April 1984
Hottest feels-like
42.2 °C
6 July 2012
Coldest feels-like
-35.9 °C
3 February 1996
Snowiest day
28.8 cm
26 January 1978
Sunniest day
14.9 h
14 June 1940
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 | -0.8 °C | 34 mm | -23 mm |
| Feb | -0.7 °C | -0.6 °C | 30 mm | -17 mm |
| Mar | 10.9 °C | +5.0 °C | 86 mm | +17 mm |
| Apr | 14.8 °C | +1.4 °C | 73 mm | -20 mm |
| May | 19.4 °C | -0.3 °C | 106 mm | +10 mm |
| Jun | 26.8 °C | +1.9 °C | 106 mm | +15 mm |
| Jul | 28.2 °C | +1.3 °C | 82 mm | -10 mm |
| Aug | 27.0 °C | +1.1 °C | 58 mm | -32 mm |
| Sep | 24.7 °C | +2.8 °C | 36 mm | -45 mm |
| Oct | 17.7 °C | +2.4 °C | 82 mm | +5 mm |
| Nov | 7.6 °C | 0.0 °C | 49 mm | -24 mm |
| Dec | 0.5 °C | -0.8 °C | 71 mm | +9 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 Wyoming?
Wyoming has a hot-summer humid continental climate (Köppen Dfa). Over 1940-2025, the average annual temperature is 8.9 °C and it receives 927 mm of precipitation per year.
What is the hottest day ever recorded in Wyoming?
The hottest day measured in Wyoming between 1940 and 2025 was 20 June 1953, reaching 37.4 °C.
What is the coldest day in Wyoming?
The coldest day measured in Wyoming between 1940 and 2025 was 3 February 1996, at -30.4 °C.
Does it snow in Wyoming?
Yes. Wyoming gets on average 97.2 cm of snow per year and has around 126 frost days.
Has the climate of Wyoming warmed?
Yes: Wyoming warmed by +2.2 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Wyoming?
The wettest day measured in Wyoming between 1940 and 2025 was 28 June 1945, with 82 mm of rain in 24 hours.
What was the windiest day in Wyoming?
The windiest day measured in Wyoming between 1940 and 2025 was 6 April 1979, with winds reaching 56.6 km/h.
What is the warmest month in Wyoming?
The warmest month in Wyoming is July (22.0 °C on average); the coldest is January (-4.8 °C).
How much does it rain in Wyoming?
Wyoming receives on average 927 mm of precipitation per year, spread over about 127 rainy days.
Is it sunny in Wyoming?
Wyoming 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 Wyoming?
The heaviest 24-hour snowfall measured in Wyoming between 1940 and 2025 was 26 January 1978, with 28.8 cm.
Are there tropical nights in Wyoming?
Yes: Wyoming has on average 16 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Wyoming?
In Wyoming, between 1940 and 2025, the highest apparent temperature reached 42.2 °C on 6 July 2012, and the lowest was -35.9 °C on 3 February 1996.
Compare Wyoming with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Wyoming