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Aspen, Colorado climate
Dfb Warm-summer humid continental
Aspen has a seasonal cold-temperate climate (Warm-summer humid continental, Köppen Dfb). The hottest month is July with an average daily high near 26°C, while the coldest is December averaging around −12°C at night. Around 620 mm of precipitation falls each year, peaking in April (69 mm) and easing off in June (28 mm). Snowfall is heavy (440 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 figuresHours of sunshine per day
Estimated sunny hours each month — daylight length × clear-sky fraction · 1991–2020 monthly cloud cover (NASA POWER)Aspen climate normals (1991–2020)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°C) | 1 | 3 | 7 | 11 | 17 | 23 | 26 | 24 | 21 | 14 | 7 | 1 |
| Avg temp (°C) | −5 | −4 | 0 | 4 | 9 | 14 | 17 | 16 | 13 | 6 | 0 | −6 |
| Avg low (°C) | −12 | −11 | −7 | −3 | 1 | 6 | 9 | 8 | 4 | −1 | −7 | −12 |
| Precipitation (mm) | 53 | 57 | 63 | 69 | 55 | 28 | 50 | 44 | 48 | 49 | 53 | 51 |
| Snowfall (cm) | 71 | 73 | 68 | 54 | 17 | 1 | — | — | 3 | 25 | 61 | 67 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°C) | 1 | 3 | 7 | 11 | 17 | 23 |
| Avg temp (°C) | −5 | −4 | 0 | 4 | 9 | 14 |
| Avg low (°C) | −12 | −11 | −7 | −3 | 1 | 6 |
| Precipitation (mm) | 53 | 57 | 63 | 69 | 55 | 28 |
| Snowfall (cm) | 71 | 73 | 68 | 54 | 17 | 1 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°C) | 26 | 24 | 21 | 14 | 7 | 1 |
| Avg temp (°C) | 17 | 16 | 13 | 6 | 0 | −6 |
| Avg low (°C) | 9 | 8 | 4 | −1 | −7 | −12 |
| Precipitation (mm) | 50 | 44 | 48 | 49 | 53 | 51 |
| Snowfall (cm) | — | — | 3 | 25 | 61 | 67 |
How often — frequency of weather events
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 13 | 13 | 11 | 13 | 11 | 7 | 11 | 13 | 10 | 9 | 10 | 11 |
| Days with low ≤ 0°C (days) | 31 | 28 | 29 | 25 | 11 | 2 | 0.1 | 0.1 | 4 | 19 | 28 | 29 |
| Days with snowfall ≥ 2.5 cm (days) | 8 | 8 | 7 | 6 | 2 | 0.1 | — | — | 0.3 | 3 | 6 | 8 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 13 | 13 | 11 | 13 | 11 | 7 |
| Days with low ≤ 0°C (days) | 31 | 28 | 29 | 25 | 11 | 2 |
| Days with snowfall ≥ 2.5 cm (days) | 8 | 8 | 7 | 6 | 2 | 0.1 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 11 | 13 | 10 | 9 | 10 | 11 |
| Days with low ≤ 0°C (days) | 0.1 | 0.1 | 4 | 19 | 28 | 29 |
| Days with snowfall ≥ 2.5 cm (days) | — | — | 0.3 | 3 | 6 | 8 |
Sky & atmosphere
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cloud cover (%) | 58 | 64 | 64 | 69 | 66 | 50 | 55 | 58 | 48 | 51 | 55 | 59 |
| Relative humidity (%) | 91 | 94 | 89 | 76 | 64 | 52 | 56 | 59 | 57 | 63 | 77 | 89 |
| Wind speed (mph) | 2.3 | 2.5 | 2.4 | 2.1 | 1.5 | 1.1 | 0.8 | 0.8 | 1.0 | 1.3 | 1.8 | 2.1 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 58 | 64 | 64 | 69 | 66 | 50 |
| Relative humidity (%) | 91 | 94 | 89 | 76 | 64 | 52 |
| Wind speed (mph) | 2.3 | 2.5 | 2.4 | 2.1 | 1.5 | 1.1 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 55 | 58 | 48 | 51 | 55 | 59 |
| Relative humidity (%) | 56 | 59 | 57 | 63 | 77 | 89 |
| Wind speed (mph) | 0.8 | 0.8 | 1.0 | 1.3 | 1.8 | 2.1 |
Methodology & sources
Temperature & precipitation — 1991–2020 normals computed from 30 years of daily observations at Aspen 1sw, a weather station, about 2 km from the city centre. The underlying daily records come from NOAA's global station network.
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.