Louisville weather by month
What a typical year looks like in Louisville, Colorado: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at LONGMONT 2 ESE, 23 km from Louisville; records cover 1893–2026.
The year at a glance
- Precipitation a year
- 15.2 in386 mm
- Snow a year
- Rare
- Last spring freeze
- May 10
- First fall freeze
- Sep 26
- Heating degree days
- 6,111
- Cooling degree days
- 657
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 99°37° (cooling, 1%).
Month by month
Louisville in January
Highs average 45°7° and lows 14°−10°, with 0.56 in14 mm of precipitation in a typical January.
- Record high
- 75°24° (1982)
- Record low
- −38°−39° (1930)
- Heating degree days
- 1102
- Cooling degree days
- 0
Louisville in February
Highs average 47°8° and lows 17°−8°, with 0.57 in14 mm of precipitation in a typical February.
- Record high
- 79°26° (1932)
- Record low
- −36°−38° (1951)
- Heating degree days
- 925
- Cooling degree days
- 0
Louisville in March
Highs average 57°14° and lows 26°−3°, with 1.2 in30 mm of precipitation in a typical March.
- Record high
- 92°33° (2026)
- Record low
- −26°−32° (1932)
- Heating degree days
- 730
- Cooling degree days
- 0
Louisville in April
Highs average 63°17° and lows 32°0°, with 2 in52 mm of precipitation in a typical April.
- Record high
- 91°33° (2022)
- Record low
- −7°−22° (1975)
- Heating degree days
- 518
- Cooling degree days
- 1
Louisville in May
Highs average 73°23° and lows 41°5°, with 2 in50 mm of precipitation in a typical May.
- Record high
- 100°38° (2003)
- Record low
- 18°−8° (1917)
- Heating degree days
- 265
- Cooling degree days
- 19
Louisville in June
Highs average 84°29° and lows 51°10°, with 1.8 in44 mm of precipitation in a typical June.
- Record high
- 106°41° (1994)
- Record low
- 29°−2° (1998)
- Heating degree days
- 58
- Cooling degree days
- 124
Louisville in July
Highs average 91°33° and lows 55°13°, with 1.7 in43 mm of precipitation in a typical July.
- Record high
- 106°41° (1973)
- Record low
- 38°3° (1994)
- Heating degree days
- 7
- Cooling degree days
- 257
Louisville in August
Highs average 88°31° and lows 54°12°, with 2 in50 mm of precipitation in a typical August.
- Record high
- 104°40° (1995)
- Record low
- 37°3° (1992)
- Heating degree days
- 11
- Cooling degree days
- 189
Louisville in September
Highs average 80°27° and lows 46°8°, with 1.3 in32 mm of precipitation in a typical September.
- Record high
- 101°38° (2020)
- Record low
- 18°−8° (1985)
- Heating degree days
- 124
- Cooling degree days
- 66
Louisville in OctoberThis month
Highs average 66°19° and lows 33°0°, with 1 in26 mm of precipitation in a typical October.
- Record high
- 92°33° (1926)
- Record low
- −5°−21° (1917)
- Heating degree days
- 480
- Cooling degree days
- 1
Louisville in November
Highs average 54°12° and lows 24°−5°, with 0.75 in19 mm of precipitation in a typical November.
- Record high
- 83°28° (1931)
- Record low
- −16°−27° (1952)
- Heating degree days
- 795
- Cooling degree days
- 0
Louisville in December
Highs average 45°7° and lows 15°−10°, with 0.46 in12 mm of precipitation in a typical December.
- Record high
- 78°26° (1939)
- Record low
- −32°−36° (1924)
- Heating degree days
- 1096
- Cooling degree days
- 0
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