Moses Lake weather by month
What a typical year looks like in Moses Lake, Washington: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at Moses Lake Grant County Airport, 8 km from Moses Lake; records cover 1949–2026.
The year at a glance
- Precipitation a year
- 7.8 in198 mm
- Snow a year
- Rare
- Last spring freeze
- May 1
- First fall freeze
- Oct 6
- Heating degree days
- 5,791
- Cooling degree days
- 677
Freeze dates are medians (half of years earlier, half later). Degree days use a 65°F base; HVAC design temperatures here are 4°−16° (heating, 99%) and 101°38° (cooling, 1%).
Month by month
Moses Lake in January
Highs average 36°2° and lows 24°−5°, with 1 in26 mm of precipitation in a typical January.
- Record high
- 60°16° (2020)
- Record low
- −22°−30° (1950)
- Heating degree days
- 1082
- Cooling degree days
- 0
Moses Lake in February
Highs average 44°7° and lows 27°−3°, with 0.65 in17 mm of precipitation in a typical February.
- Record high
- 65°18° (2018)
- Record low
- −9°−23° (1957)
- Heating degree days
- 830
- Cooling degree days
- 0
Moses Lake in March
Highs average 55°13° and lows 32°0°, with 0.73 in19 mm of precipitation in a typical March.
- Record high
- 75°24° (1960)
- Record low
- 1°−17° (2019)
- Heating degree days
- 673
- Cooling degree days
- 0
Moses Lake in April
Highs average 64°18° and lows 37°3°, with 0.65 in17 mm of precipitation in a typical April.
- Record high
- 89°32° (1998)
- Record low
- 21°−6° (2011)
- Heating degree days
- 436
- Cooling degree days
- 1
Moses Lake in May
Highs average 74°23° and lows 45°7°, with 0.72 in18 mm of precipitation in a typical May.
- Record high
- 97°36° (2001)
- Record low
- 25°−4° (2010)
- Heating degree days
- 196
- Cooling degree days
- 27
Moses Lake in June
Highs average 80°27° and lows 52°11°, with 0.73 in19 mm of precipitation in a typical June.
- Record high
- 114°46° (2021)
- Record low
- 37°3° (1952)
- Heating degree days
- 58
- Cooling degree days
- 95
Moses Lake in July
Highs average 90°32° and lows 57°14°, with 0.26 in6.6 mm of precipitation in a typical July.
- Record high
- 109°43° (2020)
- Record low
- 42°6° (1999)
- Heating degree days
- 6
- Cooling degree days
- 268
Moses Lake in August
Highs average 88°31° and lows 56°13°, with 0.15 in3.8 mm of precipitation in a typical August.
- Record high
- 112°44° (1961)
- Record low
- 42°6° (2006)
- Heating degree days
- 9
- Cooling degree days
- 232
Moses Lake in September
Highs average 79°26° and lows 47°8°, with 0.26 in6.6 mm of precipitation in a typical September.
- Record high
- 100°38° (1950)
- Record low
- 27°−3° (2000)
- Heating degree days
- 117
- Cooling degree days
- 53
Moses Lake in OctoberThis month
Highs average 63°17° and lows 37°3°, with 0.66 in17 mm of precipitation in a typical October.
- Record high
- 86°30° (1958)
- Record low
- 5°−15° (2002)
- Heating degree days
- 470
- Cooling degree days
- 1
Moses Lake in November
Highs average 46°8° and lows 29°−2°, with 0.87 in22 mm of precipitation in a typical November.
- Record high
- 70°21° (2020)
- Record low
- −19°−28° (2010)
- Heating degree days
- 824
- Cooling degree days
- 0
Moses Lake in December
Highs average 36°2° and lows 24°−5°, with 1.1 in28 mm of precipitation in a typical December.
- Record high
- 68°20° (1998)
- Record low
- −13°−25° (1964)
- Heating degree days
- 1090
- Cooling degree days
- 0