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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 79°F, while the coldest is December averaging around 36°F at night. Precipitation totals about 24 inches a year and is strongly seasonal — December alone averages 3.8 inches while July barely receives 0.26 inches.
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 (°F) | 47 | 51 | 56 | 62 | 68 | 72 | 79 | 79 | 75 | 63 | 52 | 46 |
| Avg temp (°F) | 42 | 44 | 48 | 52 | 58 | 62 | 67 | 67 | 63 | 54 | 46 | 41 |
| Avg low (°F) | 36 | 36 | 39 | 42 | 47 | 51 | 55 | 55 | 51 | 45 | 40 | 36 |
| Precipitation (in) | 3.2 | 2.3 | 2.4 | 1.8 | 1.6 | 0.9 | 0.3 | 0.3 | 1.1 | 2.2 | 3.6 | 3.8 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°F) | 47 | 51 | 56 | 62 | 68 | 72 |
| Avg temp (°F) | 42 | 44 | 48 | 52 | 58 | 62 |
| Avg low (°F) | 36 | 36 | 39 | 42 | 47 | 51 |
| Precipitation (in) | 3.2 | 2.3 | 2.4 | 1.8 | 1.6 | 0.9 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°F) | 79 | 79 | 75 | 63 | 52 | 46 |
| Avg temp (°F) | 67 | 67 | 63 | 54 | 46 | 41 |
| Avg low (°F) | 55 | 55 | 51 | 45 | 40 | 36 |
| Precipitation (in) | 0.3 | 0.3 | 1.1 | 2.2 | 3.6 | 3.8 |
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 (mph) | 0.3 | 0.3 | 0.3 | 0.3 | 0.2 | 0.2 | 0.2 | 0.2 | 0.3 | 0.4 | 0.4 | 0.3 |
| 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 (mph) | 0.3 | 0.3 | 0.3 | 0.3 | 0.2 | 0.2 |
| 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 (mph) | 0.2 | 0.2 | 0.3 | 0.4 | 0.4 | 0.3 |
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.