Greenwater weather by month
What a typical year looks like in Greenwater, Washington: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at Mud Mountain Dam, 23 km from Greenwater; records cover 1939–2026.
The year at a glance
- Precipitation a year
- 60.1 in1527 mm
- Snow a year
- Rare
- Last spring freeze
- Apr 23
- First fall freeze
- Oct 28
- Heating degree days
- 5,654
- Cooling degree days
- 154
Freeze dates are medians (half of years earlier, half later). Degree days use a 65°F base; HVAC design temperatures here are 19°−7° (heating, 99%) and 89°32° (cooling, 1%).
Month by month
Greenwater in January
Highs average 46°8° and lows 33°1°, with 7 in179 mm of precipitation in a typical January.
- Record high
- 74°23° (1940)
- Record low
- −2°−19° (1950)
- Heating degree days
- 794
- Cooling degree days
- 0
Greenwater in February
Highs average 47°9° and lows 33°1°, with 5.2 in132 mm of precipitation in a typical February.
- Record high
- 73°23° (1991)
- Record low
- 2°−17° (1950)
- Heating degree days
- 692
- Cooling degree days
- 0
Greenwater in March
Highs average 51°10° and lows 35°2°, with 6.6 in168 mm of precipitation in a typical March.
- Record high
- 75°24° (2019)
- Record low
- 11°−12° (1955)
- Heating degree days
- 684
- Cooling degree days
- 0
Greenwater in April
Highs average 56°13° and lows 38°3°, with 5.6 in142 mm of precipitation in a typical April.
- Record high
- 87°31° (2016)
- Record low
- 24°−4° (1982)
- Heating degree days
- 548
- Cooling degree days
- 1
Greenwater in May
Highs average 63°17° and lows 44°6°, with 5 in127 mm of precipitation in a typical May.
- Record high
- 92°33° (1983)
- Record low
- 26°−3° (2002)
- Heating degree days
- 376
- Cooling degree days
- 6
Greenwater in June
Highs average 67°20° and lows 48°9°, with 3.9 in98 mm of precipitation in a typical June.
- Record high
- 107°42° (2021)
- Record low
- 32°0° (2002)
- Heating degree days
- 239
- Cooling degree days
- 17
Greenwater in July
Highs average 75°24° and lows 52°11°, with 1.5 in38 mm of precipitation in a typical July.
- Record high
- 99°37° (1942)
- Record low
- 35°2° (2002)
- Heating degree days
- 106
- Cooling degree days
- 54
Greenwater in August
Highs average 76°24° and lows 52°11°, with 1.7 in42 mm of precipitation in a typical August.
- Record high
- 98°37° (1981)
- Record low
- 35°2° (1995)
- Heating degree days
- 89
- Cooling degree days
- 55
Greenwater in September
Highs average 70°21° and lows 48°9°, with 3.4 in86 mm of precipitation in a typical September.
- Record high
- 94°34° (1979)
- Record low
- 28°−2° (2008)
- Heating degree days
- 203
- Cooling degree days
- 20
Greenwater in OctoberThis month
Highs average 59°15° and lows 42°6°, with 6 in152 mm of precipitation in a typical October.
- Record high
- 90°32° (1987)
- Record low
- 22°−6° (2003)
- Heating degree days
- 449
- Cooling degree days
- 1
Greenwater in November
Highs average 50°10° and lows 36°2°, with 8 in204 mm of precipitation in a typical November.
- Record high
- 76°24° (1999)
- Record low
- 7°−14° (1985)
- Heating degree days
- 654
- Cooling degree days
- 0
Greenwater in December
Highs average 45°7° and lows 33°0°, with 6.3 in160 mm of precipitation in a typical December.
- Record high
- 66°19° (1993)
- Record low
- 0°−18° (2008)
- Heating degree days
- 820
- Cooling degree days
- 0