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Grand Junction, Colorado climate
BSk Cold semi-arid
Grand Junction has a strongly seasonal cool-temperate climate (Cold semi-arid, Köppen BSk). The hottest month is July with an average daily high near 35°C, while the coldest is January averaging around −7°C at night. Around 289 mm of precipitation falls each year, peaking in September (37 mm) and easing off in June (15 mm).
Temperature & precipitation
Daily high–low temperature range with the monthly average, plus monthly precipitation · 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 countsGrand Junction climate normals (1991–2020)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°C) | 4 | 8 | 15 | 19 | 25 | 32 | 35 | 33 | 28 | 20 | 11 | 4 |
| Avg temp (°C) | −2 | 2 | 8 | 12 | 17 | 23 | 27 | 25 | 20 | 13 | 5 | −1 |
| Avg low (°C) | −7 | −3 | 1 | 5 | 10 | 15 | 19 | 18 | 13 | 5 | −1 | −6 |
| Precipitation (mm) | 20 | 17 | 22 | 27 | 32 | 15 | 23 | 26 | 37 | 32 | 21 | 17 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°C) | 4 | 8 | 15 | 19 | 25 | 32 |
| Avg temp (°C) | −2 | 2 | 8 | 12 | 17 | 23 |
| Avg low (°C) | −7 | −3 | 1 | 5 | 10 | 15 |
| Precipitation (mm) | 20 | 17 | 22 | 27 | 32 | 15 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°C) | 35 | 33 | 28 | 20 | 11 | 4 |
| Avg temp (°C) | 27 | 25 | 20 | 13 | 5 | −1 |
| Avg low (°C) | 19 | 18 | 13 | 5 | −1 | −6 |
| Precipitation (mm) | 23 | 26 | 37 | 32 | 21 | 17 |
How often — frequency of weather events
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 6 | 5 | 5 | 5 | 6 | 3 | 6 | 5 | 5 | 5 | 4 | 7 |
| Days with high ≥ 32°C (days) | — | — | — | 0.1 | 1 | 18 | 24 | 19 | 6 | 0.1 | — | — |
| Days with low ≤ 0°C (days) | 27 | 21 | 9 | 3 | 0.1 | — | — | — | — | 3 | 18 | 30 |
| Days with snowfall ≥ 2.5 cm (days) | 2 | 1 | 0.5 | 0.2 | — | — | — | — | — | 0.1 | 0.6 | 2 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 6 | 5 | 5 | 5 | 6 | 3 |
| Days with high ≥ 32°C (days) | — | — | — | 0.1 | 1 | 18 |
| Days with low ≤ 0°C (days) | 27 | 21 | 9 | 3 | 0.1 | — |
| Days with snowfall ≥ 2.5 cm (days) | 2 | 1 | 0.5 | 0.2 | — | — |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 6 | 5 | 5 | 5 | 4 | 7 |
| Days with high ≥ 32°C (days) | 24 | 19 | 6 | 0.1 | — | — |
| Days with low ≤ 0°C (days) | — | — | — | 3 | 18 | 30 |
| Days with snowfall ≥ 2.5 cm (days) | — | — | — | 0.1 | 0.6 | 2 |
Sky & atmosphere
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cloud cover (%) | 56 | 63 | 60 | 61 | 57 | 42 | 49 | 50 | 40 | 44 | 50 | 58 |
| Clear days (≤ 30% cloud) | 7 | 4 | 5 | 5 | 7 | 12 | 9 | 9 | 14 | 13 | 10 | 7 |
| Partly cloudy days (30–70%) | 13 | 11 | 13 | 12 | 12 | 11 | 14 | 13 | 9 | 10 | 11 | 12 |
| Cloudy days (≥ 70%) | 11 | 13 | 13 | 13 | 12 | 6 | 8 | 9 | 7 | 9 | 9 | 12 |
| Relative humidity (%) | 72 | 65 | 57 | 51 | 44 | 33 | 36 | 41 | 42 | 48 | 58 | 69 |
| Wind speed (km/h) | 6.9 | 8.1 | 8.9 | 9.8 | 9.3 | 9.5 | 7.5 | 7.0 | 7.6 | 7.6 | 7.1 | 6.7 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 56 | 63 | 60 | 61 | 57 | 42 |
| Clear days (≤ 30% cloud) | 7 | 4 | 5 | 5 | 7 | 12 |
| Partly cloudy days (30–70%) | 13 | 11 | 13 | 12 | 12 | 11 |
| Cloudy days (≥ 70%) | 11 | 13 | 13 | 13 | 12 | 6 |
| Relative humidity (%) | 72 | 65 | 57 | 51 | 44 | 33 |
| Wind speed (km/h) | 6.9 | 8.1 | 8.9 | 9.8 | 9.3 | 9.5 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 49 | 50 | 40 | 44 | 50 | 58 |
| Clear days (≤ 30% cloud) | 9 | 9 | 14 | 13 | 10 | 7 |
| Partly cloudy days (30–70%) | 14 | 13 | 9 | 10 | 11 | 12 |
| Cloudy days (≥ 70%) | 8 | 9 | 7 | 9 | 9 | 12 |
| Relative humidity (%) | 36 | 41 | 42 | 48 | 58 | 69 |
| Wind speed (km/h) | 7.5 | 7.0 | 7.6 | 7.6 | 7.1 | 6.7 |
Methodology & sources
Temperature & precipitation — the official 1991–2020 climate normals from NOAA's U.S. Climate Normals, measured at Grand Junction Wfo (NOAA GHCN station USC00053486), about 7 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.