Rock Springs climate — normals and trends
Rock Springs (United States) has a warm-summer humid continental climate (Dfb) under the Köppen-Geiger classification. Its mean annual temperature is 5.7 °C and it receives 291 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 (21.6 °C on average) and the coldest is January (-8.7 °C). Rainfall peaks in April.
Rock Springs averages 179 frost days, 19 hot days (≥ 30 °C) and 76 rainy days per year.
Rock Springs has warmed by +2.6 °C between 1940 and 2025, or +0.31 °C per decade. This trend is statistically significant.
The number of frost days there went from about 191 to 167 per year over the period.
The hottest day of the period reached 36.7 °C (on 19 July 2021) and the coldest -35.5 °C (on 3 January 1974).
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
Rock SpringsWyoming
- coords
- 41.59°, -109.20°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
5.7°C
Average daily high
11.6°C
Average daily low
-0.2°C
Annual rainfall
291mm
Sunshine / day
10.9h
Mean relative humidity
56%
Average peak wind
21.5km/h
Seasonal range
30.3°C
Frost days (< 0 °C)
179 d/yr
Hot days (≥ 30 °C)
19 d/yr
Rainy days (≥ 1 mm)
76 d/yr
Annual snowfall
106.7 cm
Average feels-like high
7.3 °C
Average feels-like low
-4.2 °C
Average peak gust
41.0 km/h
Tropical nights (≥ 20 °C)
0 d/yr
Solar radiation
19.0 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+2.6 °C
since 1940
+0.3 °C per decade · r² = 0.41 · 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
36.7 °C
19 July 2021
Coldest day
-35.5 °C
3 January 1974
Wettest day
44 mm
11 June 1970
Windiest day
55.6 km/h
12 January 1972
Strongest gust
102.6 km/h
3 May 2001
Hottest feels-like
34.7 °C
19 July 2021
Coldest feels-like
-40.9 °C
3 January 1974
Snowiest day
18.6 cm
14 January 1953
Sunniest day
14.8 h
7 July 2025
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 | -5.5 °C | -1.5 °C | 14 mm | -5 mm |
| Feb | 1.5 °C | +3.0 °C | 21 mm | +3 mm |
| Mar | 6.4 °C | +2.9 °C | 46 mm | +15 mm |
| Apr | 11.8 °C | +1.9 °C | 27 mm | -15 mm |
| May | 18.9 °C | +2.1 °C | 20 mm | -21 mm |
| Jun | 26.7 °C | +3.1 °C | 5 mm | -18 mm |
| Jul | 29.4 °C | +1.0 °C | 11 mm | -2 mm |
| Aug | 27.7 °C | +0.8 °C | 15 mm | +1 mm |
| Sep | 22.8 °C | +1.5 °C | 16 mm | -5 mm |
| Oct | 14.1 °C | +0.9 °C | 26 mm | -1 mm |
| Nov | 9.4 °C | +5.8 °C | 22 mm | -0 mm |
| Dec | 6.0 °C | +8.4 °C | 19 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 Rock Springs?
Rock Springs has a warm-summer humid continental climate (Köppen Dfb). Over 1940-2025, the average annual temperature is 5.7 °C and it receives 291 mm of precipitation per year.
What is the hottest day ever recorded in Rock Springs?
The hottest day measured in Rock Springs between 1940 and 2025 was 19 July 2021, reaching 36.7 °C.
What is the coldest day in Rock Springs?
The coldest day measured in Rock Springs between 1940 and 2025 was 3 January 1974, at -35.5 °C.
Does it snow in Rock Springs?
Yes. Rock Springs gets on average 106.7 cm of snow per year and has around 179 frost days.
Has the climate of Rock Springs warmed?
Yes: Rock Springs warmed by +2.6 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Rock Springs?
The wettest day measured in Rock Springs between 1940 and 2025 was 11 June 1970, with 44 mm of rain in 24 hours.
What was the windiest day in Rock Springs?
The windiest day measured in Rock Springs between 1940 and 2025 was 12 January 1972, with winds reaching 55.6 km/h.
What is the warmest month in Rock Springs?
The warmest month in Rock Springs is July (21.6 °C on average); the coldest is January (-8.7 °C).
How much does it rain in Rock Springs?
Rock Springs receives on average 291 mm of precipitation per year, spread over about 76 rainy days.
Is it sunny in Rock Springs?
Rock Springs gets on average 10.9 hours of sunshine per day, roughly 3,979 hours per year over 1940-2025.
What is the biggest single-day snowfall in Rock Springs?
The heaviest 24-hour snowfall measured in Rock Springs between 1940 and 2025 was 14 January 1953, with 18.6 cm.
Are there tropical nights in Rock Springs?
Almost never: tropical nights (temperature staying above 20 °C) are virtually non-existent in Rock Springs.
What was the most extreme apparent temperature in Rock Springs?
In Rock Springs, between 1940 and 2025, the highest apparent temperature reached 34.7 °C on 19 July 2021, and the lowest was -40.9 °C on 3 January 1974.
Compare Rock Springs with another city
Pick a second city: its normals will be set against these, indicator by indicator.