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Longview, Washington climate
Csb Warm-summer Mediterranean
Longview has a seasonal cool-temperate climate (Warm-summer Mediterranean, Köppen Csb). The hottest month is August with an average daily high near 26°C, while the coldest is December averaging around 2°C at night. Precipitation totals about 597 mm a year and is strongly seasonal — December alone averages 97 mm while July barely receives 7 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)Longview climate normals (1991–2020)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°C) | 8 | 11 | 14 | 16 | 20 | 22 | 26 | 26 | 24 | 17 | 11 | 8 |
| Avg temp (°C) | 5 | 6 | 9 | 11 | 14 | 17 | 20 | 20 | 17 | 12 | 8 | 5 |
| Avg low (°C) | 2 | 2 | 4 | 5 | 8 | 11 | 13 | 13 | 11 | 7 | 5 | 2 |
| Precipitation (mm) | 82 | 57 | 61 | 45 | 41 | 23 | 7 | 8 | 29 | 56 | 91 | 97 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°C) | 8 | 11 | 14 | 16 | 20 | 22 |
| Avg temp (°C) | 5 | 6 | 9 | 11 | 14 | 17 |
| Avg low (°C) | 2 | 2 | 4 | 5 | 8 | 11 |
| Precipitation (mm) | 82 | 57 | 61 | 45 | 41 | 23 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°C) | 26 | 26 | 24 | 17 | 11 | 8 |
| Avg temp (°C) | 20 | 20 | 17 | 12 | 8 | 5 |
| Avg low (°C) | 13 | 13 | 11 | 7 | 5 | 2 |
| Precipitation (mm) | 7 | 8 | 29 | 56 | 91 | 97 |
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 (%) | 94 | 91 | 89 | 86 | 84 | 84 | 80 | 79 | 80 | 87 | 93 | 94 |
| Wind speed (km/h) | 0.5 | 0.5 | 0.5 | 0.5 | 0.4 | 0.4 | 0.3 | 0.4 | 0.5 | 0.6 | 0.6 | 0.5 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 76 | 73 | 75 | 74 | 71 | 67 |
| Relative humidity (%) | 94 | 91 | 89 | 86 | 84 | 84 |
| Wind speed (km/h) | 0.5 | 0.5 | 0.5 | 0.5 | 0.4 | 0.4 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 50 | 49 | 51 | 65 | 75 | 76 |
| Relative humidity (%) | 80 | 79 | 80 | 87 | 93 | 94 |
| Wind speed (km/h) | 0.3 | 0.4 | 0.5 | 0.6 | 0.6 | 0.5 |
Methodology & sources
Temperature & precipitation — 1991–2020 normals computed from 25 years of daily observations at Kelso-longview Airport, a weather station, about 4 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.