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Rock Springs, Wyoming climate
BSk Cold semi-arid
Rock Springs has a strongly seasonal cold-temperate climate (Cold semi-arid, Köppen BSk). The hottest month is July with an average daily high near 29°C, while the coldest is December averaging around −10°C at night. Precipitation totals about 192 mm a year and is strongly seasonal — May alone averages 32 mm while December barely receives 8 mm. Winters bring significant snowfall (137 cm of snow per year on average).
Temperature & precipitation
Daily high–low temperature range with the monthly average, plus monthly precipitation split into rain and snow · 1991–2020 normals · hover a month for the exact figuresClear vs cloudy days
Share of days each month that are clear, partly cloudy or cloudy · 1991–2020 · hover a month for the day countsRock Springs climate normals (1991–2020)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°C) | −1 | 1 | 7 | 12 | 17 | 24 | 29 | 28 | 22 | 13 | 5 | −1 |
| Avg temp (°C) | −6 | −4 | 1 | 5 | 10 | 16 | 21 | 20 | 14 | 7 | 0 | −6 |
| Avg low (°C) | −10 | −9 | −4 | −1 | 4 | 8 | 13 | 12 | 7 | 1 | −6 | −10 |
| Precipitation (mm) | 10 | 9 | 15 | 23 | 32 | 18 | 12 | 14 | 20 | 21 | 10 | 8 |
| Snowfall (cm) | 21 | 20 | 16 | 22 | 7 | 1 | — | — | 3 | 17 | 15 | 15 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°C) | −1 | 1 | 7 | 12 | 17 | 24 |
| Avg temp (°C) | −6 | −4 | 1 | 5 | 10 | 16 |
| Avg low (°C) | −10 | −9 | −4 | −1 | 4 | 8 |
| Precipitation (mm) | 10 | 9 | 15 | 23 | 32 | 18 |
| Snowfall (cm) | 21 | 20 | 16 | 22 | 7 | 1 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°C) | 29 | 28 | 22 | 13 | 5 | −1 |
| Avg temp (°C) | 21 | 20 | 14 | 7 | 0 | −6 |
| Avg low (°C) | 13 | 12 | 7 | 1 | −6 | −10 |
| Precipitation (mm) | 12 | 14 | 20 | 21 | 10 | 8 |
| Snowfall (cm) | — | — | 3 | 17 | 15 | 15 |
How often — frequency of weather events
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 5 | 5 | 7 | 8 | 9 | 5 | 5 | 6 | 6 | 6 | 5 | 5 |
| Days with high ≥ 32°C (days) | — | — | — | — | 0.0 | 1 | 7 | 2 | 0.1 | — | — | — |
| Days with low ≤ 0°C (days) | 30 | 28 | 27 | 21 | 7 | 0.7 | — | — | 2 | 15 | 27 | 31 |
| Days with snowfall ≥ 2.5 cm (days) | 0.9 | 0.8 | 0.8 | 0.9 | 0.4 | 0.1 | — | — | 0.1 | 0.7 | 0.6 | 0.9 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 5 | 5 | 7 | 8 | 9 | 5 |
| Days with high ≥ 32°C (days) | — | — | — | — | 0.0 | 1 |
| Days with low ≤ 0°C (days) | 30 | 28 | 27 | 21 | 7 | 0.7 |
| Days with snowfall ≥ 2.5 cm (days) | 0.9 | 0.8 | 0.8 | 0.9 | 0.4 | 0.1 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 5 | 6 | 6 | 6 | 5 | 5 |
| Days with high ≥ 32°C (days) | 7 | 2 | 0.1 | — | — | — |
| Days with low ≤ 0°C (days) | — | — | 2 | 15 | 27 | 31 |
| Days with snowfall ≥ 2.5 cm (days) | — | — | 0.1 | 0.7 | 0.6 | 0.9 |
Sky & atmosphere
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cloud cover (%) | 59 | 62 | 60 | 61 | 59 | 46 | 44 | 45 | 42 | 48 | 56 | 61 |
| Clear days (≤ 30% cloud) | 5 | 4 | 5 | 5 | 6 | 10 | 11 | 10 | 13 | 11 | 6 | 5 |
| Partly cloudy days (30–70%) | 14 | 12 | 13 | 12 | 12 | 12 | 13 | 14 | 10 | 11 | 13 | 14 |
| Cloudy days (≥ 70%) | 12 | 13 | 12 | 13 | 13 | 8 | 7 | 6 | 7 | 9 | 11 | 13 |
| Relative humidity (%) | 80 | 72 | 60 | 55 | 50 | 40 | 35 | 37 | 42 | 53 | 65 | 77 |
| Wind speed (mph) | 9.9 | 10.0 | 9.6 | 9.2 | 8.0 | 8.0 | 6.7 | 6.6 | 7.4 | 8.3 | 9.0 | 9.6 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 59 | 62 | 60 | 61 | 59 | 46 |
| Clear days (≤ 30% cloud) | 5 | 4 | 5 | 5 | 6 | 10 |
| Partly cloudy days (30–70%) | 14 | 12 | 13 | 12 | 12 | 12 |
| Cloudy days (≥ 70%) | 12 | 13 | 12 | 13 | 13 | 8 |
| Relative humidity (%) | 80 | 72 | 60 | 55 | 50 | 40 |
| Wind speed (mph) | 9.9 | 10.0 | 9.6 | 9.2 | 8.0 | 8.0 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 44 | 45 | 42 | 48 | 56 | 61 |
| Clear days (≤ 30% cloud) | 11 | 10 | 13 | 11 | 6 | 5 |
| Partly cloudy days (30–70%) | 13 | 14 | 10 | 11 | 13 | 14 |
| Cloudy days (≥ 70%) | 7 | 6 | 7 | 9 | 11 | 13 |
| Relative humidity (%) | 35 | 37 | 42 | 53 | 65 | 77 |
| Wind speed (mph) | 6.7 | 6.6 | 7.4 | 8.3 | 9.0 | 9.6 |
Methodology & sources
Temperature & precipitation — the official 1991–2020 climate normals from NOAA's U.S. Climate Normals, measured at Rock Springs AP (NOAA GHCN station USW00024027), about 13 km from the city centre.
Cloud, humidity, wind & sunshine — modelled estimates from NASA POWER, NASA's satellite-and-reanalysis climatology. This is the standard global source for atmospheric variables, which are not measured at most weather stations.