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Gillette, Wyoming climate
Dfa Hot-summer humid continental
Gillette has a strongly seasonal cool-temperate climate (Hot-summer humid continental, Köppen Dfa). The hottest month is July with an average daily high near 30°C, while the coldest is December averaging around −9°C at night. Precipitation totals about 447 mm a year and is strongly seasonal — May alone averages 83 mm while January barely receives 15 mm. Winters bring significant snowfall (141 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 countsGillette climate normals (1991–2020)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°C) | 2 | 3 | 9 | 14 | 19 | 25 | 30 | 30 | 24 | 15 | 8 | 2 |
| Avg temp (°C) | −3 | −3 | 3 | 7 | 12 | 18 | 22 | 21 | 16 | 8 | 2 | −3 |
| Avg low (°C) | −9 | −8 | −4 | 0 | 5 | 10 | 14 | 13 | 8 | 1 | −4 | −9 |
| Precipitation (mm) | 15 | 20 | 29 | 54 | 83 | 65 | 43 | 35 | 32 | 40 | 16 | 16 |
| Snowfall (cm) | 21 | 23 | 22 | 24 | 3 | 0 | — | — | 1 | 11 | 15 | 21 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°C) | 2 | 3 | 9 | 14 | 19 | 25 |
| Avg temp (°C) | −3 | −3 | 3 | 7 | 12 | 18 |
| Avg low (°C) | −9 | −8 | −4 | 0 | 5 | 10 |
| Precipitation (mm) | 15 | 20 | 29 | 54 | 83 | 65 |
| Snowfall (cm) | 21 | 23 | 22 | 24 | 3 | 0 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°C) | 30 | 30 | 24 | 15 | 8 | 2 |
| Avg temp (°C) | 22 | 21 | 16 | 8 | 2 | −3 |
| Avg low (°C) | 14 | 13 | 8 | 1 | −4 | −9 |
| Precipitation (mm) | 43 | 35 | 32 | 40 | 16 | 16 |
| Snowfall (cm) | — | — | 1 | 11 | 15 | 21 |
How often — frequency of weather events
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 7 | 8 | 8 | 11 | 12 | 10 | 8 | 6 | 6 | 8 | 6 | 6 |
| Days with high ≥ 32°C (days) | — | — | — | — | 0.3 | 3 | 11 | 10 | 3 | 0.0 | — | — |
| Days with low ≤ 0°C (days) | 28 | 26 | 24 | 17 | 5 | 0.1 | — | — | 2 | 13 | 24 | 28 |
| Days with snowfall ≥ 2.5 cm (days) | 3 | 3 | 3 | 2 | 0.4 | 0.1 | — | — | 0.2 | 2 | 2 | 3 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 7 | 8 | 8 | 11 | 12 | 10 |
| Days with high ≥ 32°C (days) | — | — | — | — | 0.3 | 3 |
| Days with low ≤ 0°C (days) | 28 | 26 | 24 | 17 | 5 | 0.1 |
| Days with snowfall ≥ 2.5 cm (days) | 3 | 3 | 3 | 2 | 0.4 | 0.1 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 8 | 6 | 6 | 8 | 6 | 6 |
| Days with high ≥ 32°C (days) | 11 | 10 | 3 | 0.0 | — | — |
| Days with low ≤ 0°C (days) | — | — | 2 | 13 | 24 | 28 |
| Days with snowfall ≥ 2.5 cm (days) | — | — | 0.2 | 2 | 2 | 3 |
Sky & atmosphere
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cloud cover (%) | 66 | 67 | 66 | 67 | 64 | 54 | 44 | 45 | 48 | 59 | 63 | 66 |
| Clear days (≤ 30% cloud) | 4 | 3 | 4 | 4 | 5 | 7 | 11 | 11 | 11 | 7 | 5 | 4 |
| Partly cloudy days (30–70%) | 12 | 10 | 11 | 10 | 11 | 13 | 14 | 13 | 10 | 10 | 10 | 12 |
| Cloudy days (≥ 70%) | 16 | 15 | 16 | 16 | 15 | 10 | 6 | 7 | 9 | 14 | 15 | 15 |
| Relative humidity (%) | 73 | 68 | 62 | 60 | 57 | 54 | 47 | 44 | 47 | 58 | 65 | 72 |
| Wind speed (mph) | 7.5 | 7.9 | 7.8 | 7.8 | 7.4 | 6.8 | 6.4 | 6.6 | 6.9 | 7.4 | 7.0 | 7.2 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 66 | 67 | 66 | 67 | 64 | 54 |
| Clear days (≤ 30% cloud) | 4 | 3 | 4 | 4 | 5 | 7 |
| Partly cloudy days (30–70%) | 12 | 10 | 11 | 10 | 11 | 13 |
| Cloudy days (≥ 70%) | 16 | 15 | 16 | 16 | 15 | 10 |
| Relative humidity (%) | 73 | 68 | 62 | 60 | 57 | 54 |
| Wind speed (mph) | 7.5 | 7.9 | 7.8 | 7.8 | 7.4 | 6.8 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 44 | 45 | 48 | 59 | 63 | 66 |
| Clear days (≤ 30% cloud) | 11 | 11 | 11 | 7 | 5 | 4 |
| Partly cloudy days (30–70%) | 14 | 13 | 10 | 10 | 10 | 12 |
| Cloudy days (≥ 70%) | 6 | 7 | 9 | 14 | 15 | 15 |
| Relative humidity (%) | 47 | 44 | 47 | 58 | 65 | 72 |
| Wind speed (mph) | 6.4 | 6.6 | 6.9 | 7.4 | 7.0 | 7.2 |
Methodology & sources
Temperature & precipitation — the official 1991–2020 climate normals from NOAA's U.S. Climate Normals, measured at Gillette 3se (NOAA GHCN station USC00483855), about 5 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.