Soap Lake weather by month
What a typical year looks like in Soap Lake, Washington: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at Ephrata Airport, 10 km from Soap Lake; records cover 1949–2026.
The year at a glance
- Precipitation a year
- 7.6 in193 mm
- Snow a year
- Rare
- Last spring freeze
- Apr 23
- First fall freeze
- Oct 15
- Heating degree days
- 5,755
- Cooling degree days
- 843
Freeze dates are medians (half of years earlier, half later). Degree days use a 65°F base; HVAC design temperatures here are 6°−14° (heating, 99%) and 101°38° (cooling, 1%).
Month by month
Soap Lake in January
Highs average 36°2° and lows 24°−5°, with 0.91 in23 mm of precipitation in a typical January.
- Record high
- 61°16° (1953)
- Record low
- −22°−30° (1950)
- Heating degree days
- 1099
- Cooling degree days
- 0
Soap Lake in February
Highs average 43°6° and lows 27°−3°, with 0.64 in16 mm of precipitation in a typical February.
- Record high
- 65°18° (1977)
- Record low
- −24°−31° (1950)
- Heating degree days
- 841
- Cooling degree days
- 0
Soap Lake in March
Highs average 54°12° and lows 32°0°, with 0.7 in18 mm of precipitation in a typical March.
- Record high
- 75°24° (1960)
- Record low
- 2°−17° (1955)
- Heating degree days
- 684
- Cooling degree days
- 0
Soap Lake in April
Highs average 63°17° and lows 39°4°, with 0.58 in15 mm of precipitation in a typical April.
- Record high
- 94°34° (1977)
- Record low
- 19°−7° (2022)
- Heating degree days
- 428
- Cooling degree days
- 2
Soap Lake in May
Highs average 73°23° and lows 48°9°, with 0.75 in19 mm of precipitation in a typical May.
- Record high
- 101°38° (1986)
- Record low
- 28°−2° (2002)
- Heating degree days
- 181
- Cooling degree days
- 40
Soap Lake in June
Highs average 80°27° and lows 54°12°, with 0.65 in17 mm of precipitation in a typical June.
- Record high
- 116°47° (2021)
- Record low
- 34°1° (1976)
- Heating degree days
- 53
- Cooling degree days
- 119
Soap Lake in July
Highs average 89°32° and lows 61°16°, with 0.3 in7.6 mm of precipitation in a typical July.
- Record high
- 109°43° (1960)
- Record low
- 40°4° (1981)
- Heating degree days
- 5
- Cooling degree days
- 324
Soap Lake in August
Highs average 88°31° and lows 59°15°, with 0.18 in4.6 mm of precipitation in a typical August.
- Record high
- 115°46° (1961)
- Record low
- 36°2° (1960)
- Heating degree days
- 8
- Cooling degree days
- 276
Soap Lake in September
Highs average 79°26° and lows 51°10°, with 0.22 in5.6 mm of precipitation in a typical September.
- Record high
- 106°41° (1988)
- Record low
- 28°−2° (2000)
- Heating degree days
- 94
- Cooling degree days
- 80
Soap Lake in OctoberThis month
Highs average 62°17° and lows 39°4°, with 0.66 in17 mm of precipitation in a typical October.
- Record high
- 88°31° (2014)
- Record low
- 8°−13° (2002)
- Heating degree days
- 441
- Cooling degree days
- 2
Soap Lake in November
Highs average 46°8° and lows 30°−1°, with 0.86 in22 mm of precipitation in a typical November.
- Record high
- 72°22° (1989)
- Record low
- −15°−26° (1985)
- Heating degree days
- 822
- Cooling degree days
- 0
Soap Lake in December
Highs average 36°2° and lows 24°−5°, with 1.1 in29 mm of precipitation in a typical December.
- Record high
- 69°21° (2021)
- Record low
- −21°−29° (1983)
- Heating degree days
- 1099
- Cooling degree days
- 0