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Seattle, Washington Climate & Temperature

  • Seattle, Washington, Usa is at 47°36'N, 122°19'W, 60 m (197 ft). See map.
  • Seattle, Washington has a warm mediterranean/ dry-summer subtropical climate that is mild with dry, warm summers and moderate seasonality. Regions with this subtype of the Mediterranean climate closely resemble an oceanic climate with generally cloudier and damper conditions than typical Mediterranean climates tho they are still susceptible to fire in the warm dry summer months. (Köppen-Geiger classification: Csb)
  • According to the Holdridge life zones system of bioclimatic classification Seattle, Washington is situated in or near the cool temperate wet forest biome.
  • The annual mean temperature is 11.5 degrees Celsius (52.7 degrees Fahrenheit). See the temperatures page for a monthly breakdown and the fixed scale graph.
  • Average monthly temperatures vary by 13.5 °C (24.3°F). This indicates that the continentality type is oceanic, subtype truly oceanic. Seattle, Washington Climate Graph
  • In the winter time records indicate temperatures by day reach 8.7°C (47.6°F) on average falling to 2.8°C (37.1°F) overnight.
  • In spring time temperatures climb reaching 14.8°C (58.7°F) generally in the afternoon with overnight lows of 6.3°C (43.3°F).
  • During summer average high temperatures are 22.6°C (72.6°F) and average low temperatures are 13.1°C (55.6°F).
  • Come autumn/ fall temperatures decrease achieving average highs of 15.6°C (60.1°F) during the day and lows of 8.3°C (46.9°F) generally shortly after sunrise.
  • Total annual Precipitation averages 965.4 mm (38 inches) which is equivalent to 965.4 Litres/m² (23.68 Gallons/ft²).
  • On average there are 2044 hours of sunshine per year. Visit the sunshine and daylight section to check monthly details including how high in the sky the sun reaches each month.
  • Were you to burrow down through the centre of the Earth from Seattle, Washington you would pop up nearest to the climate station at Port-Aux-Francais, kerguelen islands, French Southern Lands where you would find a Tundra climate (Boreal rain forest biome).

Seattle, Washington Climate Table

  Climate Variable Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Annual
 
Average Max Temperature °C ( °F) 8 (46) 10 (51) 12 (54) 15 (58) 18 (64) 21 (70) 23 (74) 23 (74) 20 (69) 16 (60) 11 (51) 8 (46) 15 (60)
 
Average Temperature °C ( °F) 5 (41) 7 (44) 8 (47) 10 (50) 13 (56) 16 (61) 19 (65) 19 (66) 16 (61) 12 (53) 8 (46) 5 (42) 12 (53)
 
Average Min Temperature °C ( °F) 2 (36) 3 (38) 4 (40) 6 (43) 9 (48) 12 (53) 14 (56) 14 (57) 12 (53) 8 (47) 5 (41) 3 (37) 8 (46)
 
Average Precipitation mm (in) 136 (5) 102 (4) 96 (4) 64 (3) 47 (2) 40 (2) 22 (1) 31 (1) 49 (2) 83 (3) 144 (6) 152 (6) 965 (38)
Number of Wet Days (probability of rain on a day %) 19 (61) 15 (53) 16 (52) 12 (40) 11 (35) 9 (30) 5 (16) 5 (16) 8 (27) 14 (45) 17 (57) 19 (61) 150 (41)
Average Sunlight Hours/ Day 2h 00' 3h 34' 5h 15' 6h 52' 7h 36' 7h 46' 10h 09' 8h 05' 6h 32' 4h 23' 2h 50' 1h 56' 5h 35'
Average Daylight Hours/ Day 8h 53' 10h 09' 11h 49' 13h 35' 15h 06' 15h 53' 15h 32' 14h 13' 12h 30' 10h 44' 9h 14' 8h 29' 12h 00'
Percentage of Sunny (Cloudy) Daylight Hours 23 (77) 36 (64) 45 (55) 51 (49) 51 (49) 49 (51) 66 (34) 58 (42) 53 (47) 42 (58) 31 (69) 23 (77) 47 (53)
Sun altitude at solar noon on the 21st day (°). 22.6 32 42.8 54.4 62.7 65.8 62.7 54.3 42.9 31.4 22.3 19 42.7

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