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Index, Washington Climate Averages

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Index Monthly Climate Averages

January
February
March
April
May
June
July
August
September
October
November
December
Hi 35°F Lo 23°F Hi 33°F Lo 21°F Hi 37°F Lo 24°F Hi 43°F Lo 29°F Hi 52°F Lo 35°F Hi 58°F Lo 39°F Hi 67°F Lo 43°F Hi 68°F Lo 44°F Hi 61°F Lo 41°F Hi 49°F Lo 35°F Hi 39°F Lo 28°F Hi 33°F Lo 21°F
5 mph 4 mph 4 mph 4 mph 4 mph 4 mph 4 mph 3 mph 3 mph 4 mph 4 mph 4 mph
19.2 in 16.2 in 16.1 in 10.1 in 7.4 in 5.2 in 1.7 in 2.2 in 5.5 in 14.4 in 17.5 in 17.2 in
92% 94% 93% 88% 82% 78% 71% 73% 76% 82% 89% 92%
69% 72% 73% 68% 57% 52% 33% 33% 44% 55% 69% 70%
30.1 in 30.1 in 30.0 in 30.0 in 30.0 in 30.0 in 30.0 in 30.0 in 30.0 in 30.0 in 30.1 in 30.1 in
8 5 4 9 18 22 28 28 22 19 8 5
15 14 18 16 12 8 3 3 8 12 17 14
9 13 11 5 0 0 0 0 0 0 4 13
12 11 11 12 12 14 13 13 11 9 9 10
1 1 2 2 3 4 5 3 3 2 1 1
156 141 153 187 248 272 335 332 286 232 158 156
January
February
March
April
May
June
July
August
September
October
November
December
Hi 1°C Lo -5°C Hi 1°C Lo -6°C Hi 3°C Lo -4°C Hi 6°C Lo -2°C Hi 11°C Lo 2°C Hi 15°C Lo 4°C Hi 19°C Lo 6°C Hi 20°C Lo 7°C Hi 16°C Lo 5°C Hi 10°C Lo 1°C Hi 4°C Lo -2°C Hi 1°C Lo -6°C
8 km/h 7 km/h 6 km/h 6 km/h 6 km/h 6 km/h 6 km/h 6 km/h 5 km/h 6 km/h 7 km/h 7 km/h
488 mm 412 mm 408 mm 256 mm 189 mm 131 mm 43 mm 57 mm 140 mm 365 mm 443 mm 436 mm
92% 94% 93% 88% 82% 78% 71% 73% 76% 82% 89% 92%
69% 72% 73% 68% 57% 52% 33% 33% 44% 55% 69% 70%
1020 mb 1019 mb 1017 mb 1017 mb 1016 mb 1015 mb 1016 mb 1015 mb 1016 mb 1017 mb 1018 mb 1019 mb
8 5 4 9 18 22 28 28 22 19 8 5
15 14 18 16 12 8 3 3 8 12 17 14
9 13 11 5 0 0 0 0 0 0 4 13
12 11 11 12 12 14 13 13 11 9 9 10
1 1 2 2 3 4 5 3 3 2 1 1
156 141 153 187 248 272 335 332 286 232 158 156
Month
Avg. Temperatures
Avg. Wind Speed
Avg. Precipitation
Average Humidity
Avg. Cloud Cover
Pressure Average
Average Dry Days
Avg. Precip. Days
Avg. Snow Days
Average Fog Days
Average UV Index
Avg. Hours of Sun
Averages are based on historical weather data from the past 10 years.

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