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Flagstaff, Arizona climate
Csb Warm-summer Mediterranean
Flagstaff has a seasonal cool-temperate climate (Warm-summer Mediterranean, Köppen Csb). The hottest month is July with an average daily high near 82°F, while the coldest is December averaging around 17°F at night. Precipitation totals about 21 inches a year and is strongly seasonal — August alone averages 3.0 inches while June barely receives 0.30 inches. Snowfall is heavy (90 inches 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 countsFlagstaff climate normals (1991–2020)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°F) | 43 | 46 | 52 | 59 | 68 | 79 | 82 | 79 | 74 | 64 | 52 | 43 |
| Avg temp (°F) | 31 | 33 | 38 | 44 | 51 | 61 | 67 | 65 | 58 | 48 | 38 | 30 |
| Avg low (°F) | 18 | 20 | 24 | 28 | 35 | 43 | 51 | 51 | 43 | 32 | 23 | 17 |
| Precipitation (in) | 2.1 | 2.2 | 1.9 | 0.9 | 0.8 | 0.3 | 2.6 | 3.0 | 1.8 | 1.5 | 1.6 | 1.9 |
| Snowfall (in) | 20.9 | 19.3 | 15.6 | 5.0 | 1.1 | — | — | — | — | 1.5 | 8.2 | 18.5 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°F) | 43 | 46 | 52 | 59 | 68 | 79 |
| Avg temp (°F) | 31 | 33 | 38 | 44 | 51 | 61 |
| Avg low (°F) | 18 | 20 | 24 | 28 | 35 | 43 |
| Precipitation (in) | 2.1 | 2.2 | 1.9 | 0.9 | 0.8 | 0.3 |
| Snowfall (in) | 20.9 | 19.3 | 15.6 | 5.0 | 1.1 | — |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°F) | 82 | 79 | 74 | 64 | 52 | 43 |
| Avg temp (°F) | 67 | 65 | 58 | 48 | 38 | 30 |
| Avg low (°F) | 51 | 51 | 43 | 32 | 23 | 17 |
| Precipitation (in) | 2.6 | 3.0 | 1.8 | 1.5 | 1.6 | 1.9 |
| Snowfall (in) | — | — | — | 1.5 | 8.2 | 18.5 |
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 | 7 | 5 | 5 | 2 | 12 | 13 | 8 | 5 | 4 | 7 |
| Days with high ≥ 90°F (days) | — | — | — | — | — | 0.8 | 2 | 0.6 | 0.1 | — | — | — |
| Days with low ≤ 32°F (days) | 30 | 28 | 29 | 24 | 11 | 2 | — | — | 2 | 18 | 28 | 30 |
| Days with snowfall ≥ 1 in (days) | 3 | 3 | 2 | 0.9 | 0.3 | — | — | — | — | 0.2 | 1 | 3 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 7 | 8 | 7 | 5 | 5 | 2 |
| Days with high ≥ 90°F (days) | — | — | — | — | — | 0.8 |
| Days with low ≤ 32°F (days) | 30 | 28 | 29 | 24 | 11 | 2 |
| Days with snowfall ≥ 1 in (days) | 3 | 3 | 2 | 0.9 | 0.3 | — |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 12 | 13 | 8 | 5 | 4 | 7 |
| Days with high ≥ 90°F (days) | 2 | 0.6 | 0.1 | — | — | — |
| Days with low ≤ 32°F (days) | — | — | 2 | 18 | 28 | 30 |
| Days with snowfall ≥ 1 in (days) | — | — | — | 0.2 | 1 | 3 |
Sky & atmosphere
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cloud cover (%) | 48 | 49 | 46 | 42 | 38 | 30 | 54 | 52 | 34 | 33 | 36 | 47 |
| Clear days (≤ 30% cloud) | 11 | 10 | 11 | 12 | 15 | 19 | 8 | 8 | 16 | 18 | 15 | 11 |
| Partly cloudy days (30–70%) | 11 | 10 | 12 | 12 | 11 | 8 | 12 | 13 | 9 | 7 | 9 | 11 |
| Cloudy days (≥ 70%) | 9 | 9 | 8 | 6 | 5 | 4 | 11 | 10 | 5 | 6 | 5 | 9 |
| Relative humidity (%) | 63 | 61 | 53 | 44 | 38 | 28 | 44 | 52 | 47 | 46 | 52 | 62 |
| Wind speed (mph) | 1.6 | 1.7 | 1.8 | 1.7 | 1.6 | 1.7 | 1.3 | 1.2 | 1.4 | 1.4 | 1.4 | 1.4 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 48 | 49 | 46 | 42 | 38 | 30 |
| Clear days (≤ 30% cloud) | 11 | 10 | 11 | 12 | 15 | 19 |
| Partly cloudy days (30–70%) | 11 | 10 | 12 | 12 | 11 | 8 |
| Cloudy days (≥ 70%) | 9 | 9 | 8 | 6 | 5 | 4 |
| Relative humidity (%) | 63 | 61 | 53 | 44 | 38 | 28 |
| Wind speed (mph) | 1.6 | 1.7 | 1.8 | 1.7 | 1.6 | 1.7 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 54 | 52 | 34 | 33 | 36 | 47 |
| Clear days (≤ 30% cloud) | 8 | 8 | 16 | 18 | 15 | 11 |
| Partly cloudy days (30–70%) | 12 | 13 | 9 | 7 | 9 | 11 |
| Cloudy days (≥ 70%) | 11 | 10 | 5 | 6 | 5 | 9 |
| Relative humidity (%) | 44 | 52 | 47 | 46 | 52 | 62 |
| Wind speed (mph) | 1.3 | 1.2 | 1.4 | 1.4 | 1.4 | 1.4 |
Methodology & sources
Temperature & precipitation — the official 1991–2020 climate normals from NOAA's U.S. Climate Normals, measured at Flagstaff AP (NOAA GHCN station USW00003103), about 6 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.