Morrison weather by month
What a typical year looks like in Morrison, Colorado: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at KASSLER, 19 km from Morrison; records cover 1918–2026.
The year at a glance
- Precipitation a year
- 18.2 in463 mm
- Snow a year
- 62 in158 cm
- Last spring freeze
- May 11
- First fall freeze
- Oct 5
- Heating degree days
- 6,013
- Cooling degree days
- 645
Freeze dates are medians (half of years earlier, half later). Degree days use a 65°F base; HVAC design temperatures here are −5°−21° (heating, 99%) and 97°36° (cooling, 1%).
Month by month
Morrison in January
Highs average 47°8° and lows 17°−8°, with 0.61 in15 mm of precipitation and 9 in22 cm of snow in a typical January.
- Record high
- 76°24° (1997)
- Record low
- −32°−36° (1930)
- Heating degree days
- 1026
- Cooling degree days
- 0
Morrison in February
Highs average 47°9° and lows 18°−8°, with 0.74 in19 mm of precipitation and 10 in26 cm of snow in a typical February.
- Record high
- 79°26° (2017)
- Record low
- −29°−34° (1951)
- Heating degree days
- 904
- Cooling degree days
- 0
Morrison in March
Highs average 55°13° and lows 26°−3°, with 1.7 in43 mm of precipitation and 10 in24 cm of snow in a typical March.
- Record high
- 89°32° (2026)
- Record low
- −20°−29° (1943)
- Heating degree days
- 763
- Cooling degree days
- 0
Morrison in April
Highs average 61°16° and lows 33°0°, with 2.4 in60 mm of precipitation and 9 in22 cm of snow in a typical April.
- Record high
- 88°31° (1989)
- Record low
- −10°−23° (1975)
- Heating degree days
- 551
- Cooling degree days
- 1
Morrison in May
Highs average 69°21° and lows 43°6°, with 2.5 in63 mm of precipitation and 1.2 in3 cm of snow in a typical May.
- Record high
- 97°36° (1932)
- Record low
- 17°−8° (1954)
- Heating degree days
- 296
- Cooling degree days
- 15
Morrison in June
Highs average 81°27° and lows 52°11°, with 1.8 in46 mm of precipitation in a typical June.
- Record high
- 105°41° (1994)
- Record low
- 30°−1° (1919)
- Heating degree days
- 66
- Cooling degree days
- 112
Morrison in July
Highs average 87°30° and lows 59°15°, with 1.7 in43 mm of precipitation in a typical July.
- Record high
- 105°41° (1995)
- Record low
- 37°3° (1987)
- Heating degree days
- 8
- Cooling degree days
- 248
Morrison in August
Highs average 85°29° and lows 57°14°, with 2 in51 mm of precipitation in a typical August.
- Record high
- 101°38° (2002)
- Record low
- 40°4° (1987)
- Heating degree days
- 16
- Cooling degree days
- 199
Morrison in September
Highs average 78°25° and lows 48°9°, with 1.7 in43 mm of precipitation and 0.6 in1.5 cm of snow in a typical September.
- Record high
- 99°37° (1930)
- Record low
- 18°−8° (1985)
- Heating degree days
- 131
- Cooling degree days
- 66
Morrison in OctoberThis month
Highs average 66°19° and lows 36°2°, with 1.5 in38 mm of precipitation and 4 in9 cm of snow in a typical October.
- Record high
- 90°32° (1926)
- Record low
- −8°−22° (1993)
- Heating degree days
- 448
- Cooling degree days
- 4
Morrison in November
Highs average 54°12° and lows 25°−4°, with 0.92 in23 mm of precipitation and 8 in20 cm of snow in a typical November.
- Record high
- 82°28° (1978)
- Record low
- −14°−26° (1952)
- Heating degree days
- 758
- Cooling degree days
- 0
Morrison in December
Highs average 46°8° and lows 17°−9°, with 0.73 in19 mm of precipitation and 12 in29 cm of snow in a typical December.
- Record high
- 78°26° (1939)
- Record low
- −31°−35° (1990)
- Heating degree days
- 1046
- Cooling degree days
- 0
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