What is the hottest month in Castle Pines?

July is the warmest month in Castle Pines, with an average high of 85.7°F.

What is the coldest month in Castle Pines?

January is the coldest month in Castle Pines, with an average low of 18.0°F.

What month does Castle Pines get the most rain?

August is typically the wettest month in Castle Pines, with about 2.52 inches of precipitation.

What plant hardiness zone is Castle Pines in?

Castle Pines is approximately in USDA plant hardiness Zone 7a, based on the average annual extreme minimum temperature.

Has the climate in Castle Pines changed recently?

36.9% of Castle Pines'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.

Castle Pines, CO

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

BSk Semi-arid (cold) climate 7a USDA hardiness Zone 7a

Year-round temperatures (°F)

Avg high Avg low

Climate summary

Castle Pines has an annual average temperature of 49.5°F with about 17.6 inches of precipitation per year and 57.5 inches of snow. The warmest month is July (average high 85.7°F), and the coldest is January (average low 18.0°F). August is typically the wettest month (2.52 in) and January the driest (0.55 in). Snow typically falls from September through May.

Annual swing

39.3°F

warmest to coldest month

Heating need

5,877

HDD/yr

Cooling need

315

CDD/yr

Best time to visit Castle Pines

Full guide →

Climate change signal

All-time records →

135 of 366 (36.9%) of Castle Pines'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		19
1900s		22
1910s		21
1920s		24
1940s		0
1950s		0
1960s		15
1970s		25
1980s		32
1990s		22
2000s		39
2010s		36
2020s		111

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	45.6°F	18.0°F	31.8°F	0.55 in	8.0 in	4
February	46.7°F	19.9°F	33.3°F	0.70 in	10.7 in	5
March	53.8°F	26.5°F	40.2°F	1.54 in	10.7 in	5
April	59.1°F	32.5°F	45.8°F	2.08 in	8.3 in	6
May	68.4°F	41.6°F	55.0°F	1.97 in	1.1 in	8
June	80.2°F	50.5°F	65.3°F	2.20 in	—	8
July	85.7°F	56.4°F	71.1°F	2.32 in	—	8
August	83.6°F	54.7°F	69.1°F	2.52 in	—	10
September	76.7°F	46.6°F	61.7°F	1.39 in	0.4 in	6
October	64.8°F	34.6°F	49.7°F	0.85 in	2.7 in	4
November	53.9°F	25.7°F	39.8°F	0.79 in	6.7 in	4
December	45.7°F	18.0°F	31.8°F	0.69 in	8.9 in	5