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Walla Walla, Washington Climate & Temperature

  • Walla Walla, Washington, Usa is at 461'N, 11819'W, 289 m (948 ft). See map.
  • Walla Walla, Washington has a hot mediterranean/ dry-summer subtropical climate (Kppen-Geiger classification: Csa) that is mild with moderate seasonality. Summers are dry and hot due to the domination of subtropical high pressure systems while winters experience moderate temperatures and changeable, rainy weather due to the polar front. These climates usually occur on the western sides of continents between the latitudes of 30 and 45. Vegetation is adapted to the dry summers and is fragrant and oily making it susceptible to fire. The typical Mediterranean climate average monthly temperatures in excess of 22.0 C (71.6 F) in its warmest month and an average in the coldest month between 18 to -3 C (64 to 27 F) with at least four months above 10 C (50 F). Seasonality is moderate (Kppen-Geiger classification: Csa).
  • According to the Holdridge life zones system of bioclimatic classification Walla Walla, Washington is situated in or near the cool temperate steppe biome.
  • The average annual temperature is 12.3 degrees Celsius (54.2 degrees Fahrenheit). See the temperatures page for a monthly breakdown and the fixed scale graph.
  • Average monthly temperatures vary by 24 °C (43.2°F). This indicates that the continentality type is continental, subtype subcontinental. Walla Walla, Washington Climate Graph
  • In the winter time records indicate temperatures by day reach 6°C (42.8°F) on average falling to -1°C (30.2°F) overnight.
  • In spring time temperatures climb reaching 17.3°C (63.2°F) generally in the afternoon with overnight lows of 6.7°C (44°F).
  • During summer average high temperatures are 29.3°C (84.8°F) and average low temperatures are 15.3°C (59.6°F).
  • Come autumn/ fall temperatures decrease achieving average highs of 17.7°C (63.8°F) during the day and lows of 7.3°C (45.2°F) generally shortly after sunrise.
  • Total annual Precipitation averages 393 mm (15.5 inches) which is equivalent to 393 Litres/m (9.64 Gallons/ft).
  • On average there are 2740 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 Walla Walla, 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).

Walla Walla, Washington Climate Table

  Climate Variable Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Annual
 
Average Max Temperature °C ( °F) 4 (39) 7 (45) 12 (54) 18 (64) 22 (72) 26 (79) 32 (90) 30 (86) 26 (79) 18 (64) 9 (48) 7 (45) 18 (64)
 
Average Temperature °C ( °F) 1 (33) 4 (38) 8 (46) 13 (55) 16 (61) 20 (67) 25 (76) 23 (73) 19 (66) 13 (55) 6 (42) 4 (38) 12 (54)
 
Average Min Temperature °C ( °F) -3 (27) 0 (32) 3 (37) 7 (45) 10 (50) 13 (55) 17 (63) 16 (61) 12 (54) 8 (46) 2 (36) 0 (32) 7 (45)
 
Average Precipitation mm (in) 48 (2) 38 (1) 41 (2) 36 (1) 38 (1) 30 (1) 5 (0) 8 (0) 20 (1) 38 (1) 43 (2) 48 (2) 393 (15)
Number of Wet Days (probability of rain on a day %) 14 (45) 11 (39) 12 (39) 9 (30) 9 (29) 8 (27) 3 (10) 3 (10) 5 (17) 9 (29) 11 (37) 14 (45) 108 (30)
Average Sunlight Hours/ Day 2h 07' 3h 51' 6h 07' 8h 42' 10h 15' 11h 28' 13h 44' 11h 54' 9h 50' 6h 44' 3h 20' 1h 42' 7h 30'
Average Daylight Hours/ Day 9h 04' 10h 16' 11h 50' 13h 30' 14h 56' 15h 40' 15h 20' 14h 06' 12h 29' 10h 49' 9h 24' 8h 41' 12h 00'
Percentage of Sunny (Cloudy) Daylight Hours 24 (76) 38 (62) 53 (47) 65 (35) 70 (30) 74 (26) 91 (9) 86 (14) 80 (20) 63 (37) 36 (64) 20 (80) 63 (37)
Sun altitude at solar noon on the 21st day (). 24.2 33.5 44.4 56 64.3 67.4 64.3 55.9 44.5 33 23.9 20.6 44.3

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