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West Lake Stevens, Washington climate
Csb Warm-summer Mediterranean
West Lake Stevens has a seasonal cool-temperate climate (Warm-summer Mediterranean, Köppen Csb). The hottest month is August with an average daily high near 24°C, while the coldest is December averaging around 1°C at night. Precipitation totals about 1022 mm a year and is strongly seasonal — November alone averages 148 mm while July barely receives 26 mm.
Temperature & precipitation
Daily high–low temperature range with the monthly average, plus monthly precipitation · 1991–2020 normals · hover a month for the exact figuresClear vs cloudy days
Share of days each month that are clear, partly cloudy or cloudy · 1991–2020 · hover a month for the day countsWest Lake Stevens climate normals (1991–2020)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°C) | 9 | 10 | 13 | 15 | 19 | 21 | 24 | 24 | 21 | 16 | 11 | 8 |
| Avg temp (°C) | 5 | 6 | 8 | 10 | 14 | 16 | 18 | 19 | 16 | 11 | 7 | 5 |
| Avg low (°C) | 1 | 1 | 3 | 5 | 8 | 11 | 13 | 13 | 10 | 6 | 3 | 1 |
| Precipitation (mm) | 128 | 94 | 104 | 86 | 69 | 58 | 26 | 29 | 59 | 94 | 148 | 126 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°C) | 9 | 10 | 13 | 15 | 19 | 21 |
| Avg temp (°C) | 5 | 6 | 8 | 10 | 14 | 16 |
| Avg low (°C) | 1 | 1 | 3 | 5 | 8 | 11 |
| Precipitation (mm) | 128 | 94 | 104 | 86 | 69 | 58 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°C) | 24 | 24 | 21 | 16 | 11 | 8 |
| Avg temp (°C) | 18 | 19 | 16 | 11 | 7 | 5 |
| Avg low (°C) | 13 | 13 | 10 | 6 | 3 | 1 |
| Precipitation (mm) | 26 | 29 | 59 | 94 | 148 | 126 |
How often — frequency of weather events
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 18 | 15 | 19 | 15 | 12 | 11 | 6 | 6 | 9 | 17 | 16 | 18 |
| Days with high ≥ 32°C (days) | — | — | — | — | 0.0 | 0.0 | 0.6 | 0.2 | — | — | — | — |
| Days with low ≤ 0°C (days) | 10 | 10 | 6 | 0.9 | 0.2 | 0.1 | — | 0.0 | 0.1 | 2 | 7 | 10 |
| Days with snowfall ≥ 2.5 cm (days) | — | 0.0 | — | 0.0 | — | — | — | — | — | — | — | 0.0 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 18 | 15 | 19 | 15 | 12 | 11 |
| Days with high ≥ 32°C (days) | — | — | — | — | 0.0 | 0.0 |
| Days with low ≤ 0°C (days) | 10 | 10 | 6 | 0.9 | 0.2 | 0.1 |
| Days with snowfall ≥ 2.5 cm (days) | — | 0.0 | — | 0.0 | — | — |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 6 | 6 | 9 | 17 | 16 | 18 |
| Days with high ≥ 32°C (days) | 0.6 | 0.2 | — | — | — | — |
| Days with low ≤ 0°C (days) | — | 0.0 | 0.1 | 2 | 7 | 10 |
| 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 | 72 | 74 | 73 | 69 | 66 | 48 | 48 | 51 | 66 | 75 | 75 |
| Clear days (≤ 30% cloud) | 3 | 4 | 3 | 3 | 4 | 4 | 11 | 11 | 10 | 5 | 3 | 2 |
| Partly cloudy days (30–70%) | 7 | 7 | 6 | 8 | 8 | 9 | 10 | 10 | 9 | 9 | 6 | 7 |
| Cloudy days (≥ 70%) | 22 | 18 | 22 | 19 | 19 | 17 | 10 | 10 | 11 | 17 | 21 | 21 |
| Relative humidity (%) | 91 | 87 | 84 | 81 | 79 | 79 | 76 | 75 | 77 | 84 | 89 | 91 |
| Wind speed (km/h) | 2.9 | 2.7 | 2.6 | 2.2 | 1.7 | 1.4 | 1.3 | 1.4 | 1.7 | 2.2 | 2.9 | 3.1 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 76 | 72 | 74 | 73 | 69 | 66 |
| Clear days (≤ 30% cloud) | 3 | 4 | 3 | 3 | 4 | 4 |
| Partly cloudy days (30–70%) | 7 | 7 | 6 | 8 | 8 | 9 |
| Cloudy days (≥ 70%) | 22 | 18 | 22 | 19 | 19 | 17 |
| Relative humidity (%) | 91 | 87 | 84 | 81 | 79 | 79 |
| Wind speed (km/h) | 2.9 | 2.7 | 2.6 | 2.2 | 1.7 | 1.4 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 48 | 48 | 51 | 66 | 75 | 75 |
| Clear days (≤ 30% cloud) | 11 | 11 | 10 | 5 | 3 | 2 |
| Partly cloudy days (30–70%) | 10 | 10 | 9 | 9 | 6 | 7 |
| Cloudy days (≥ 70%) | 10 | 10 | 11 | 17 | 21 | 21 |
| Relative humidity (%) | 76 | 75 | 77 | 84 | 89 | 91 |
| Wind speed (km/h) | 1.3 | 1.4 | 1.7 | 2.2 | 2.9 | 3.1 |
Methodology & sources
Temperature & precipitation — the official 1991–2020 climate normals from NOAA's U.S. Climate Normals, measured at Everett (NOAA GHCN station USC00452675), about 7 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.