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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 95°F, while the coldest is January averaging around 19°F at night. Around 11 inches of precipitation falls each year, peaking in September (1.5 inches) and easing off in June (0.6 inches).
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 (°F) | 39 | 47 | 59 | 67 | 77 | 89 | 95 | 91 | 82 | 67 | 52 | 39 |
| Avg temp (°F) | 29 | 36 | 47 | 54 | 63 | 74 | 80 | 77 | 69 | 55 | 41 | 30 |
| Avg low (°F) | 19 | 26 | 35 | 41 | 50 | 59 | 66 | 64 | 55 | 42 | 30 | 21 |
| Precipitation (in) | 0.8 | 0.7 | 0.9 | 1.1 | 1.3 | 0.6 | 0.9 | 1.0 | 1.5 | 1.3 | 0.8 | 0.7 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°F) | 39 | 47 | 59 | 67 | 77 | 89 |
| Avg temp (°F) | 29 | 36 | 47 | 54 | 63 | 74 |
| Avg low (°F) | 19 | 26 | 35 | 41 | 50 | 59 |
| Precipitation (in) | 0.8 | 0.7 | 0.9 | 1.1 | 1.3 | 0.6 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°F) | 95 | 91 | 82 | 67 | 52 | 39 |
| Avg temp (°F) | 80 | 77 | 69 | 55 | 41 | 30 |
| Avg low (°F) | 66 | 64 | 55 | 42 | 30 | 21 |
| Precipitation (in) | 0.9 | 1.0 | 1.5 | 1.3 | 0.8 | 0.7 |
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 ≥ 90°F (days) | — | — | — | 0.1 | 1 | 18 | 24 | 19 | 6 | 0.1 | — | — |
| Days with low ≤ 32°F (days) | 27 | 21 | 9 | 3 | 0.1 | — | — | — | — | 3 | 18 | 30 |
| Days with snowfall ≥ 1 in (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 ≥ 90°F (days) | — | — | — | 0.1 | 1 | 18 |
| Days with low ≤ 32°F (days) | 27 | 21 | 9 | 3 | 0.1 | — |
| Days with snowfall ≥ 1 in (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 ≥ 90°F (days) | 24 | 19 | 6 | 0.1 | — | — |
| Days with low ≤ 32°F (days) | — | — | — | 3 | 18 | 30 |
| Days with snowfall ≥ 1 in (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 (mph) | 4.3 | 5.0 | 5.5 | 6.1 | 5.8 | 5.9 | 4.7 | 4.4 | 4.7 | 4.7 | 4.4 | 4.2 |
| 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 (mph) | 4.3 | 5.0 | 5.5 | 6.1 | 5.8 | 5.9 |
| 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 (mph) | 4.7 | 4.4 | 4.7 | 4.7 | 4.4 | 4.2 |
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.