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Astoria, Oregon climate
Csb Warm-summer Mediterranean
Astoria has a mildly seasonal cool-temperate climate (Warm-summer Mediterranean, Köppen Csb). The hottest month is August with an average daily high near 20°C, while the coldest is December averaging around 3°C at night. Precipitation totals about 1785 mm a year and is strongly seasonal — November alone averages 281 mm while July barely receives 21 mm.
Temperature & precipitation
Daily high–low temperature range with the monthly average, plus monthly precipitation · 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)Astoria climate normals (1991–2020)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°C) | 10 | 11 | 12 | 13 | 16 | 18 | 20 | 20 | 20 | 16 | 12 | 9 |
| Avg temp (°C) | 7 | 7 | 8 | 9 | 12 | 14 | 16 | 16 | 15 | 12 | 8 | 6 |
| Avg low (°C) | 3 | 3 | 4 | 5 | 8 | 10 | 12 | 12 | 10 | 7 | 5 | 3 |
| Precipitation (mm) | 269 | 182 | 201 | 147 | 86 | 58 | 21 | 28 | 68 | 171 | 281 | 271 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°C) | 10 | 11 | 12 | 13 | 16 | 18 |
| Avg temp (°C) | 7 | 7 | 8 | 9 | 12 | 14 |
| Avg low (°C) | 3 | 3 | 4 | 5 | 8 | 10 |
| Precipitation (mm) | 269 | 182 | 201 | 147 | 86 | 58 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°C) | 20 | 20 | 20 | 16 | 12 | 9 |
| Avg temp (°C) | 16 | 16 | 15 | 12 | 8 | 6 |
| Avg low (°C) | 12 | 12 | 10 | 7 | 5 | 3 |
| Precipitation (mm) | 21 | 28 | 68 | 171 | 281 | 271 |
How often — frequency of weather events
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 22 | 19 | 21 | 19 | 16 | 14 | 8 | 8 | 10 | 17 | 21 | 22 |
| Days with high ≥ 32°C (days) | — | — | — | — | 0.1 | 0.1 | 0.1 | 0.3 | 0.1 | — | — | — |
| Days with low ≤ 0°C (days) | 6 | 7 | 4 | 0.9 | 0.0 | — | — | — | — | 0.6 | 4 | 7 |
| Days with snowfall ≥ 2.5 cm (days) | 0.0 | 0.1 | — | — | — | — | — | — | — | — | — | 0.0 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 22 | 19 | 21 | 19 | 16 | 14 |
| Days with high ≥ 32°C (days) | — | — | — | — | 0.1 | 0.1 |
| Days with low ≤ 0°C (days) | 6 | 7 | 4 | 0.9 | 0.0 | — |
| Days with snowfall ≥ 2.5 cm (days) | 0.0 | 0.1 | — | — | — | — |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 8 | 8 | 10 | 17 | 21 | 22 |
| Days with high ≥ 32°C (days) | 0.1 | 0.3 | 0.1 | — | — | — |
| Days with low ≤ 0°C (days) | — | — | — | 0.6 | 4 | 7 |
| Days with snowfall ≥ 2.5 cm (days) | — | — | — | — | — | 0.0 |
Sky & atmosphere
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cloud cover (%) | 76 | 73 | 75 | 74 | 71 | 67 | 50 | 49 | 51 | 65 | 75 | 76 |
| Relative humidity (%) | 91 | 89 | 88 | 86 | 85 | 85 | 86 | 87 | 87 | 88 | 90 | 91 |
| Wind speed (km/h) | 6.6 | 5.9 | 5.4 | 4.9 | 4.4 | 4.2 | 3.6 | 3.4 | 3.9 | 5.0 | 6.2 | 6.7 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 76 | 73 | 75 | 74 | 71 | 67 |
| Relative humidity (%) | 91 | 89 | 88 | 86 | 85 | 85 |
| Wind speed (km/h) | 6.6 | 5.9 | 5.4 | 4.9 | 4.4 | 4.2 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 50 | 49 | 51 | 65 | 75 | 76 |
| Relative humidity (%) | 86 | 87 | 87 | 88 | 90 | 91 |
| Wind speed (km/h) | 3.6 | 3.4 | 3.9 | 5.0 | 6.2 | 6.7 |
Methodology & sources
Temperature & precipitation — the official 1991–2020 climate normals from NOAA's U.S. Climate Normals, measured at Astoria AP (port Of) (NOAA GHCN station USW00094224), about 5 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.