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Valdez, Alaska climate
Dfc Subarctic
Valdez has a seasonal cold-temperate climate (Subarctic, Köppen Dfc). The hottest month is July with an average daily high near 18°C, while the coldest is January averaging around −7°C at night. Around 1725 mm of precipitation falls each year, peaking in September (248 mm) and easing off in June (62 mm). Snowfall is heavy (826 cm of snow per year on average). At latitude 61°N, day length swings from 5.1 hours in midwinter to 18.9 hours at midsummer.
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)Valdez climate normals (1991–2020)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°C) | −2 | 0 | 3 | 8 | 13 | 17 | 18 | 17 | 13 | 7 | 1 | −1 |
| Avg temp (°C) | −5 | −3 | −1 | 4 | 9 | 12 | 14 | 13 | 9 | 4 | −1 | −3 |
| Avg low (°C) | −7 | −6 | −5 | 0 | 4 | 8 | 10 | 8 | 5 | 1 | −4 | −6 |
| Precipitation (mm) | 167 | 150 | 104 | 86 | 77 | 62 | 98 | 178 | 248 | 203 | 156 | 197 |
| Snowfall (cm) | 169 | 161 | 116 | 57 | 9 | — | — | — | 2 | 23 | 110 | 179 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°C) | −2 | 0 | 3 | 8 | 13 | 17 |
| Avg temp (°C) | −5 | −3 | −1 | 4 | 9 | 12 |
| Avg low (°C) | −7 | −6 | −5 | 0 | 4 | 8 |
| Precipitation (mm) | 167 | 150 | 104 | 86 | 77 | 62 |
| Snowfall (cm) | 169 | 161 | 116 | 57 | 9 | — |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°C) | 18 | 17 | 13 | 7 | 1 | −1 |
| Avg temp (°C) | 14 | 13 | 9 | 4 | −1 | −3 |
| Avg low (°C) | 10 | 8 | 5 | 1 | −4 | −6 |
| Precipitation (mm) | 98 | 178 | 248 | 203 | 156 | 197 |
| Snowfall (cm) | — | — | 2 | 23 | 110 | 179 |
How often — frequency of weather events
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 16 | 15 | 14 | 14 | 14 | 13 | 17 | 18 | 20 | 19 | 15 | 17 |
| Days with high ≥ 32°C (days) | — | — | — | — | — | 0.0 | — | — | — | — | — | — |
| Days with low ≤ 0°C (days) | 30 | 27 | 28 | 16 | 1 | — | — | — | 1 | 13 | 25 | 29 |
| Days with snowfall ≥ 2.5 cm (days) | 11 | 10 | 9 | 4 | 0.8 | — | — | — | 0.1 | 2 | 8 | 11 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 16 | 15 | 14 | 14 | 14 | 13 |
| Days with high ≥ 32°C (days) | — | — | — | — | — | 0.0 |
| Days with low ≤ 0°C (days) | 30 | 27 | 28 | 16 | 1 | — |
| Days with snowfall ≥ 2.5 cm (days) | 11 | 10 | 9 | 4 | 0.8 | — |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 17 | 18 | 20 | 19 | 15 | 17 |
| Days with high ≥ 32°C (days) | — | — | — | — | — | — |
| Days with low ≤ 0°C (days) | — | — | 1 | 13 | 25 | 29 |
| Days with snowfall ≥ 2.5 cm (days) | — | — | 0.1 | 2 | 8 | 11 |
Sky & atmosphere
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cloud cover (%) | 66 | 65 | 60 | 66 | 76 | 77 | 79 | 78 | 77 | 75 | 69 | 70 |
| Relative humidity (%) | 90 | 88 | 87 | 85 | 83 | 83 | 85 | 85 | 86 | 88 | 90 | 90 |
| Wind speed (km/h) | 14.9 | 13.7 | 13.6 | 8.1 | 6.4 | 5.3 | 5.3 | 6.5 | 8.4 | 10.4 | 14.2 | 14.1 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 66 | 65 | 60 | 66 | 76 | 77 |
| Relative humidity (%) | 90 | 88 | 87 | 85 | 83 | 83 |
| Wind speed (km/h) | 14.9 | 13.7 | 13.6 | 8.1 | 6.4 | 5.3 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 79 | 78 | 77 | 75 | 69 | 70 |
| Relative humidity (%) | 85 | 85 | 86 | 88 | 90 | 90 |
| Wind speed (km/h) | 5.3 | 6.5 | 8.4 | 10.4 | 14.2 | 14.1 |
Methodology & sources
Temperature & precipitation — the official 1991–2020 climate normals from NOAA's U.S. Climate Normals, measured at Valdez Wso (NOAA GHCN station USW00026442), 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.