Kapowsin weather by month
What a typical year looks like in Kapowsin, Washington: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at MCMILLIN RESERVOIR, 19 km from Kapowsin; records cover 1941–2026.
The year at a glance
- Precipitation a year
- 45.1 in1146 mm
- Snow a year
- 6 in14 cm
- Last spring freeze
- Apr 11
- First fall freeze
- Oct 28
- Heating degree days
- 5,397
- Cooling degree days
- 119
Freeze dates are medians (half of years earlier, half later). Degree days use a 65°F base; HVAC design temperatures here are 21°−6° (heating, 99%) and 88°31° (cooling, 1%).
Month by month
Kapowsin in January
Highs average 46°8° and lows 33°1°, with 6.1 in155 mm of precipitation and 1.5 in3.8 cm of snow in a typical January.
- Record high
- 66°19° (2005)
- Record low
- 0°−18° (1950)
- Heating degree days
- 784
- Cooling degree days
- 0
Kapowsin in February
Highs average 48°9° and lows 33°1°, with 4.3 in110 mm of precipitation and 0.5 in1.3 cm of snow in a typical February.
- Record high
- 67°19° (1962)
- Record low
- 3°−16° (1950)
- Heating degree days
- 684
- Cooling degree days
- 0
Kapowsin in March
Highs average 52°11° and lows 36°2°, with 4.8 in122 mm of precipitation and 0.6 in1.5 cm of snow in a typical March.
- Record high
- 79°26° (2004)
- Record low
- 9°−13° (1955)
- Heating degree days
- 650
- Cooling degree days
- 0
Kapowsin in April
Highs average 57°14° and lows 39°4°, with 3.9 in99 mm of precipitation in a typical April.
- Record high
- 84°29° (2016)
- Record low
- 23°−5° (2004)
- Heating degree days
- 510
- Cooling degree days
- 0
Kapowsin in May
Highs average 64°18° and lows 45°7°, with 3 in75 mm of precipitation in a typical May.
- Record high
- 92°33° (1983)
- Record low
- 26°−3° (1954)
- Heating degree days
- 331
- Cooling degree days
- 2
Kapowsin in June
Highs average 69°21° and lows 49°9°, with 2.3 in58 mm of precipitation in a typical June.
- Record high
- 99°37° (2021)
- Record low
- 32°0° (1976)
- Heating degree days
- 192
- Cooling degree days
- 12
Kapowsin in July
Highs average 76°24° and lows 52°11°, with 0.92 in23 mm of precipitation in a typical July.
- Record high
- 102°39° (2009)
- Record low
- 36°2° (1949)
- Heating degree days
- 78
- Cooling degree days
- 48
Kapowsin in August
Highs average 77°25° and lows 53°11°, with 0.9 in23 mm of precipitation in a typical August.
- Record high
- 100°38° (1981)
- Record low
- 37°3° (1980)
- Heating degree days
- 63
- Cooling degree days
- 49
Kapowsin in September
Highs average 70°21° and lows 48°9°, with 1.8 in45 mm of precipitation in a typical September.
- Record high
- 95°35° (1988)
- Record low
- 29°−2° (1972)
- Heating degree days
- 191
- Cooling degree days
- 8
Kapowsin in OctoberThis month
Highs average 59°15° and lows 42°5°, with 4.1 in104 mm of precipitation in a typical October.
- Record high
- 86°30° (1987)
- Record low
- 21°−6° (1971)
- Heating degree days
- 453
- Cooling degree days
- 0
Kapowsin in November
Highs average 50°10° and lows 36°2°, with 7.1 in179 mm of precipitation and 1.5 in3.8 cm of snow in a typical November.
- Record high
- 73°23° (1949)
- Record low
- 0°−18° (1955)
- Heating degree days
- 654
- Cooling degree days
- 0
Kapowsin in December
Highs average 45°7° and lows 33°0°, with 6 in152 mm of precipitation and 1.5 in3.8 cm of snow in a typical December.
- Record high
- 66°19° (2005)
- Record low
- −1°−18° (1983)
- Heating degree days
- 807
- Cooling degree days
- 0