Grand Mound weather by month
What a typical year looks like in Grand Mound, Washington: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at Olympia Airport, 21 km from Grand Mound; records cover 1948–2026.
The year at a glance
- Precipitation a year
- 50.6 in1286 mm
- Snow a year
- 4 in10 cm
- Last spring freeze
- May 2
- First fall freeze
- Oct 11
- Heating degree days
- 5,376
- Cooling degree days
- 113
Freeze dates are medians (half of years earlier, half later). Degree days use a 65°F base; HVAC design temperatures here are 18°−8° (heating, 99%) and 92°33° (cooling, 1%).
Month by month
Grand Mound in January
Highs average 46°8° and lows 33°1°, with 7.8 in198 mm of precipitation and 2 in5.1 cm of snow in a typical January.
- Record high
- 64°18° (2005)
- Record low
- −8°−22° (1979)
- Heating degree days
- 787
- Cooling degree days
- 0
Grand Mound in February
Highs average 49°10° and lows 32°0°, with 5.1 in129 mm of precipitation and 0.6 in1.5 cm of snow in a typical February.
- Record high
- 73°23° (1986)
- Record low
- −1°−18° (1950)
- Heating degree days
- 680
- Cooling degree days
- 0
Grand Mound in March
Highs average 54°12° and lows 35°1°, with 5.7 in144 mm of precipitation and 0.1 in0.3 cm of snow in a typical March.
- Record high
- 79°26° (2004)
- Record low
- 9°−13° (1989)
- Heating degree days
- 648
- Cooling degree days
- 0
Grand Mound in April
Highs average 59°15° and lows 38°3°, with 3.7 in93 mm of precipitation in a typical April.
- Record high
- 88°31° (2016)
- Record low
- 23°−5° (1975)
- Heating degree days
- 504
- Cooling degree days
- 0
Grand Mound in May
Highs average 66°19° and lows 43°6°, with 2.3 in57 mm of precipitation in a typical May.
- Record high
- 96°36° (1983)
- Record low
- 25°−4° (1954)
- Heating degree days
- 326
- Cooling degree days
- 2
Grand Mound in June
Highs average 71°22° and lows 47°9°, with 1.5 in37 mm of precipitation in a typical June.
- Record high
- 110°43° (2021)
- Record low
- 30°−1° (1976)
- Heating degree days
- 189
- Cooling degree days
- 12
Grand Mound in July
Highs average 78°25° and lows 51°10°, with 0.53 in13 mm of precipitation in a typical July.
- Record high
- 104°40° (2009)
- Record low
- 35°2° (1962)
- Heating degree days
- 73
- Cooling degree days
- 47
Grand Mound in August
Highs average 78°26° and lows 51°10°, with 0.96 in24 mm of precipitation in a typical August.
- Record high
- 104°40° (1981)
- Record low
- 33°1° (1973)
- Heating degree days
- 67
- Cooling degree days
- 44
Grand Mound in September
Highs average 72°22° and lows 46°8°, with 2 in52 mm of precipitation in a typical September.
- Record high
- 98°37° (1988)
- Record low
- 25°−4° (1972)
- Heating degree days
- 183
- Cooling degree days
- 8
Grand Mound in OctoberThis month
Highs average 60°16° and lows 41°5°, with 5.1 in129 mm of precipitation in a typical October.
- Record high
- 90°32° (1987)
- Record low
- 14°−10° (2002)
- Heating degree days
- 454
- Cooling degree days
- 0
Grand Mound in November
Highs average 51°10° and lows 36°2°, with 8.2 in209 mm of precipitation in a typical November.
- Record high
- 74°23° (1949)
- Record low
- −1°−18° (1955)
- Heating degree days
- 654
- Cooling degree days
- 0
Grand Mound in December
Highs average 45°7° and lows 33°0°, with 7.9 in199 mm of precipitation and 1.2 in3 cm of snow in a typical December.
- Record high
- 64°18° (1958)
- Record low
- −7°−22° (1983)
- Heating degree days
- 811
- Cooling degree days
- 0