What is the hottest month in Louisville?

July is the warmest month in Louisville, with an average high of 88.0°F.

What is the coldest month in Louisville?

December is the coldest month in Louisville, with an average low of 21.1°F.

What month does Louisville get the most rain?

May is typically the wettest month in Louisville, with about 3.21 inches of precipitation.

What plant hardiness zone is Louisville in?

Louisville is approximately in USDA plant hardiness Zone 7b, based on the average annual extreme minimum temperature.

Has the climate in Louisville changed recently?

19.4% of Louisville's all-time daily heat records were set in the last decade (since 2015), compared to roughly 5% if records were evenly distributed over time.

Louisville, CO

Climate overview — based on NOAA 1991-2020 normals from BOULDER, CO US.

Cfa Humid subtropical climate 7b USDA hardiness Zone 7b

Year-round temperatures (°F)

Avg high Avg low

Climate summary

Louisville has an annual average temperature of 51.5°F with about 21.2 inches of precipitation per year and 92.8 inches of snow. The warmest month is July (average high 88.0°F), and the coldest is December (average low 21.1°F). May is typically the wettest month (3.21 in) and December the driest (0.81 in). Snow typically falls from September through May.

Annual swing

38.8°F

warmest to coldest month

Heating need

5,298

HDD/yr

Cooling need

450

CDD/yr

Best time to visit Louisville

Full guide →

Climate change signal

All-time records →

71 of 366 (19.4%) of Louisville's all-time daily heat records have been set since 2015. If records were spread evenly across the station's history, only about 5% would fall in any given decade.

1890s		2
1900s		16
1910s		12
1920s		15
1930s		23
1940s		24
1950s		44
1960s		20
1970s		12
1980s		43
1990s		25
2000s		42
2010s		39
2020s		49

Bars: number of all-time daily heat records still standing that were set in each decade.

Monthly averages

Month	Avg High	Avg Low	Avg Temp	Precipitation	Snow	Rainy days
January	47.0°F	21.5°F	34.3°F	0.83 in	11.3 in	6
February	48.3°F	22.3°F	35.3°F	0.99 in	15.0 in	7
March	57.0°F	29.0°F	43.0°F	1.99 in	15.7 in	8
April	62.8°F	34.5°F	48.7°F	3.05 in	14.7 in	10
May	71.3°F	42.7°F	57.0°F	3.21 in	2.0 in	13
June	82.5°F	51.1°F	66.8°F	1.95 in	—	10
July	88.0°F	57.0°F	72.5°F	1.83 in	—	11
August	86.0°F	55.5°F	70.7°F	1.68 in	—	11
September	78.8°F	48.1°F	63.5°F	2.09 in	1.0 in	8
October	65.9°F	37.2°F	51.6°F	1.62 in	7.0 in	7
November	54.5°F	28.1°F	41.3°F	1.18 in	13.1 in	6
December	46.3°F	21.1°F	33.7°F	0.81 in	13.0 in	5