Florissant weather by month
What a typical year looks like in Florissant, Colorado: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at LAKE GEORGE 8 SW, 16 km from Florissant; records cover 1960–2026.
The year at a glance
- Precipitation a year
- 11.3 in287 mm
- Snow a year
- 50 in128 cm
- Last spring freeze
- May 31
- First fall freeze
- Sep 17
- Heating degree days
- 9,493
- Cooling degree days
- 11
Freeze dates are medians (half of years earlier, half later). Degree days use a 65°F base; HVAC design temperatures here are −21°−29° (heating, 99%) and 84°29° (cooling, 1%).
Month by month
Florissant in January
Highs average 33°0° and lows −1°−18°, with 0.3 in7.6 mm of precipitation and 6 in15 cm of snow in a typical January.
- Record high
- 61°16° (1997)
- Record low
- −50°−46° (1962)
- Heating degree days
- 1517
- Cooling degree days
- 0
Florissant in February
Highs average 36°2° and lows 3°−16°, with 0.27 in6.9 mm of precipitation and 6 in15 cm of snow in a typical February.
- Record high
- 60°16° (1986)
- Record low
- −42°−41° (1989)
- Heating degree days
- 1282
- Cooling degree days
- 0
Florissant in March
Highs average 45°7° and lows 13°−10°, with 0.57 in14 mm of precipitation and 10 in25 cm of snow in a typical March.
- Record high
- 76°24° (2026)
- Record low
- −30°−34° (1965)
- Heating degree days
- 1121
- Cooling degree days
- 0
Florissant in April
Highs average 51°10° and lows 23°−5°, with 0.92 in23 mm of precipitation and 9 in23 cm of snow in a typical April.
- Record high
- 73°23° (1992)
- Record low
- −14°−26° (1970)
- Heating degree days
- 849
- Cooling degree days
- 0
Florissant in May
Highs average 61°16° and lows 32°0°, with 1.4 in36 mm of precipitation and 2.4 in6.1 cm of snow in a typical May.
- Record high
- 83°28° (2002)
- Record low
- 10°−12° (1982)
- Heating degree days
- 581
- Cooling degree days
- 0
Florissant in June
Highs average 72°22° and lows 41°5°, with 1.2 in30 mm of precipitation and 0.1 in0.3 cm of snow in a typical June.
- Record high
- 88°31° (2018)
- Record low
- 24°−4° (1975)
- Heating degree days
- 259
- Cooling degree days
- 1
Florissant in July
Highs average 77°25° and lows 46°8°, with 2.2 in55 mm of precipitation in a typical July.
- Record high
- 89°32° (2026)
- Record low
- 26°−3° (1995)
- Heating degree days
- 108
- Cooling degree days
- 7
Florissant in August
Highs average 75°24° and lows 45°7°, with 2.2 in55 mm of precipitation in a typical August.
- Record high
- 88°31° (2009)
- Record low
- 30°−1° (1964)
- Heating degree days
- 161
- Cooling degree days
- 3
Florissant in September
Highs average 69°20° and lows 37°3°, with 1.1 in28 mm of precipitation and 0.8 in2 cm of snow in a typical September.
- Record high
- 85°29° (2019)
- Record low
- 8°−13° (1965)
- Heating degree days
- 368
- Cooling degree days
- 0
Florissant in OctoberThis month
Highs average 57°14° and lows 26°−3°, with 0.57 in14 mm of precipitation and 4 in10 cm of snow in a typical October.
- Record high
- 79°26° (1980)
- Record low
- −6°−21° (2020)
- Heating degree days
- 725
- Cooling degree days
- 0
Florissant in November
Highs average 45°7° and lows 15°−9°, with 0.36 in9.1 mm of precipitation and 5 in13 cm of snow in a typical November.
- Record high
- 69°21° (2025)
- Record low
- −33°−36° (1972)
- Heating degree days
- 1059
- Cooling degree days
- 0
Florissant in December
Highs average 34°1° and lows 2°−17°, with 0.27 in6.9 mm of precipitation and 7 in17 cm of snow in a typical December.
- Record high
- 58°14° (1980)
- Record low
- −40° (1978)
- Heating degree days
- 1463
- Cooling degree days
- 0
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