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Fort Collins, Colorado climate
Cfa Humid subtropical
Fort Collins has a seasonal cool-temperate climate (Humid subtropical, Köppen Cfa). The hottest month is July with an average daily high near 31°C, while the coldest is December averaging around −8°C at night. Precipitation totals about 403 mm a year and is strongly seasonal — May alone averages 69 mm while January barely receives 10 mm. Winters bring significant snowfall (131 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 countsFort Collins climate normals (1991–2020)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°C) | 7 | 8 | 14 | 17 | 22 | 28 | 31 | 29 | 25 | 18 | 11 | 7 |
| Avg temp (°C) | 0 | 1 | 6 | 9 | 14 | 20 | 23 | 22 | 17 | 10 | 4 | −1 |
| Avg low (°C) | −8 | −6 | −2 | 2 | 7 | 12 | 15 | 14 | 9 | 2 | −3 | −8 |
| Precipitation (mm) | 10 | 12 | 33 | 53 | 69 | 48 | 41 | 37 | 36 | 32 | 19 | 12 |
| Snowfall (cm) | 17 | 19 | 24 | 16 | 4 | — | — | — | 2 | 10 | 19 | 19 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°C) | 7 | 8 | 14 | 17 | 22 | 28 |
| Avg temp (°C) | 0 | 1 | 6 | 9 | 14 | 20 |
| Avg low (°C) | −8 | −6 | −2 | 2 | 7 | 12 |
| Precipitation (mm) | 10 | 12 | 33 | 53 | 69 | 48 |
| Snowfall (cm) | 17 | 19 | 24 | 16 | 4 | — |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°C) | 31 | 29 | 25 | 18 | 11 | 7 |
| Avg temp (°C) | 23 | 22 | 17 | 10 | 4 | −1 |
| Avg low (°C) | 15 | 14 | 9 | 2 | −3 | −8 |
| Precipitation (mm) | 41 | 37 | 36 | 32 | 19 | 12 |
| Snowfall (cm) | — | — | 2 | 10 | 19 | 19 |
How often — frequency of weather events
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 4 | 5 | 6 | 9 | 12 | 9 | 9 | 9 | 7 | 6 | 5 | 4 |
| Days with high ≥ 32°C (days) | — | — | — | — | 0.4 | 6 | 13 | 8 | 2 | — | — | — |
| Days with low ≤ 0°C (days) | 29 | 26 | 21 | 9 | 1 | — | — | — | 0.5 | 9 | 24 | 30 |
| Days with snowfall ≥ 2.5 cm (days) | 2 | 3 | 2 | 2 | 0.4 | 0.0 | — | — | 0.1 | 0.8 | 2 | 2 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 4 | 5 | 6 | 9 | 12 | 9 |
| Days with high ≥ 32°C (days) | — | — | — | — | 0.4 | 6 |
| Days with low ≤ 0°C (days) | 29 | 26 | 21 | 9 | 1 | — |
| Days with snowfall ≥ 2.5 cm (days) | 2 | 3 | 2 | 2 | 0.4 | 0.0 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 9 | 9 | 7 | 6 | 5 | 4 |
| Days with high ≥ 32°C (days) | 13 | 8 | 2 | — | — | — |
| Days with low ≤ 0°C (days) | — | — | 0.5 | 9 | 24 | 30 |
| Days with snowfall ≥ 2.5 cm (days) | — | — | 0.1 | 0.8 | 2 | 2 |
Sky & atmosphere
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cloud cover (%) | 63 | 67 | 68 | 71 | 69 | 56 | 57 | 60 | 54 | 55 | 59 | 63 |
| Clear days (≤ 30% cloud) | 3 | 2 | 3 | 2 | 2 | 5 | 5 | 4 | 7 | 8 | 5 | 4 |
| Partly cloudy days (30–70%) | 14 | 11 | 12 | 10 | 12 | 15 | 16 | 14 | 12 | 12 | 13 | 14 |
| Cloudy days (≥ 70%) | 14 | 15 | 16 | 18 | 18 | 9 | 10 | 12 | 10 | 11 | 12 | 14 |
| Relative humidity (%) | 57 | 57 | 53 | 51 | 51 | 44 | 44 | 45 | 44 | 49 | 53 | 58 |
| Wind speed (km/h) | 11.6 | 10.9 | 10.7 | 10.5 | 8.7 | 8.1 | 7.7 | 7.4 | 7.6 | 8.6 | 9.4 | 10.5 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 63 | 67 | 68 | 71 | 69 | 56 |
| Clear days (≤ 30% cloud) | 3 | 2 | 3 | 2 | 2 | 5 |
| Partly cloudy days (30–70%) | 14 | 11 | 12 | 10 | 12 | 15 |
| Cloudy days (≥ 70%) | 14 | 15 | 16 | 18 | 18 | 9 |
| Relative humidity (%) | 57 | 57 | 53 | 51 | 51 | 44 |
| Wind speed (km/h) | 11.6 | 10.9 | 10.7 | 10.5 | 8.7 | 8.1 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 57 | 60 | 54 | 55 | 59 | 63 |
| Clear days (≤ 30% cloud) | 5 | 4 | 7 | 8 | 5 | 4 |
| Partly cloudy days (30–70%) | 16 | 14 | 12 | 12 | 13 | 14 |
| Cloudy days (≥ 70%) | 10 | 12 | 10 | 11 | 12 | 14 |
| Relative humidity (%) | 44 | 45 | 44 | 49 | 53 | 58 |
| Wind speed (km/h) | 7.7 | 7.4 | 7.6 | 8.6 | 9.4 | 10.5 |
Methodology & sources
Temperature & precipitation — the official 1991–2020 climate normals from NOAA's U.S. Climate Normals, measured at FT Collins (NOAA GHCN station USC00053005), inside the city.
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.