Grand Lake weather by month
What a typical year looks like in Grand Lake, Colorado: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at GRAND LAKE 1 NW, 1 km from Grand Lake; records cover 1939–2026.
The year at a glance
- Precipitation a year
- 18.6 in472 mm
- Snow a year
- 155 in393 cm
- Last spring freeze
- Jun 22
- First fall freeze
- Aug 1
- Heating degree days
- 10,222
- Cooling degree days
- 1
Freeze dates are medians (half of years earlier, half later). Degree days use a 65°F base; HVAC design temperatures here are −14°−26° (heating, 99%) and 85°29° (cooling, 1%).
Month by month
Grand Lake in January
Highs average 30°−1° and lows 5°−15°, with 1.7 in42 mm of precipitation and 31 in78 cm of snow in a typical January.
- Record high
- 53°12° (1986)
- Record low
- −43°−42° (1963)
- Heating degree days
- 1477
- Cooling degree days
- 0
Grand Lake in February
Highs average 34°1° and lows 6°−14°, with 1.5 in38 mm of precipitation and 25 in64 cm of snow in a typical February.
- Record high
- 56°13° (1950)
- Record low
- −41° (1942)
- Heating degree days
- 1250
- Cooling degree days
- 0
Grand Lake in March
Highs average 42°6° and lows 14°−10°, with 1.2 in31 mm of precipitation and 18 in45 cm of snow in a typical March.
- Record high
- 71°22° (2026)
- Record low
- −36°−38° (1943)
- Heating degree days
- 1149
- Cooling degree days
- 0
Grand Lake in April
Highs average 49°10° and lows 21°−6°, with 1.6 in39 mm of precipitation and 17 in43 cm of snow in a typical April.
- Record high
- 73°23° (1943)
- Record low
- −21°−29° (1945)
- Heating degree days
- 906
- Cooling degree days
- 0
Grand Lake in May
Highs average 59°15° and lows 28°−2°, with 1.6 in40 mm of precipitation and 5 in13 cm of snow in a typical May.
- Record high
- 82°28° (2003)
- Record low
- 1°−17° (2013)
- Heating degree days
- 668
- Cooling degree days
- 0
Grand Lake in June
Highs average 71°21° and lows 34°1°, with 1.4 in35 mm of precipitation and 0.4 in1 cm of snow in a typical June.
- Record high
- 89°32° (1988)
- Record low
- 16°−9° (1978)
- Heating degree days
- 380
- Cooling degree days
- 0
Grand Lake in July
Highs average 76°24° and lows 40°4°, with 2 in50 mm of precipitation in a typical July.
- Record high
- 92°33° (1978)
- Record low
- 21°−6° (1959)
- Heating degree days
- 222
- Cooling degree days
- 1
Grand Lake in August
Highs average 73°23° and lows 38°4°, with 2.1 in53 mm of precipitation in a typical August.
- Record high
- 92°33° (1995)
- Record low
- 18°−8° (1978)
- Heating degree days
- 284
- Cooling degree days
- 0
Grand Lake in September
Highs average 68°20° and lows 32°0°, with 1.6 in40 mm of precipitation and 0.4 in1 cm of snow in a typical September.
- Record high
- 89°32° (1978)
- Record low
- 7°−14° (1959)
- Heating degree days
- 459
- Cooling degree days
- 0
Grand Lake in OctoberThis month
Highs average 55°13° and lows 23°−5°, with 1.3 in32 mm of precipitation and 7 in19 cm of snow in a typical October.
- Record high
- 80°27° (1996)
- Record low
- −15°−26° (2019)
- Heating degree days
- 806
- Cooling degree days
- 0
Grand Lake in November
Highs average 40°5° and lows 13°−10°, with 1.3 in33 mm of precipitation and 23 in57 cm of snow in a typical November.
- Record high
- 68°20° (1999)
- Record low
- −28°−33° (1957)
- Heating degree days
- 1150
- Cooling degree days
- 0
Grand Lake in December
Highs average 30°−1° and lows 5°−15°, with 1.5 in38 mm of precipitation and 29 in72 cm of snow in a typical December.
- Record high
- 55°13° (1939)
- Record low
- −35°−37° (1990)
- Heating degree days
- 1471
- Cooling degree days
- 0
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