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Monthly climate in Castle Rock, Colorado, United States

Last updated: March 2, 2024

Under the Köppen–Geiger climate classification Castle Rock features a cold semi-arid climate (BSk). Temperatures typically range between -3 °C (26 °F) and 21 °C (70 °F) through the year, but rarely can drop to -30 °C (-22 °F) or can rise to as high as 35 °C (96 °F). The average annual precipitation amounts to about 468 mm (18.4 inches) and receives 87 rainy days on the 1 mm (0.04 inches) threshold annually. Castle Rock enjoys an average of 3529 hours of sunshine throughout the year, and daylight varies from 9 hours 25 minutes to 14 hours 53 minutes per day.

Monthly average temperatures in Castle Rock, Colorado, United States §

The warmest months in Castle Rock are June, July and August, with daily mean temperatures ranging from 18 to 21 °C (65 - 70 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from -3 to -1 °C (26 - 30 °F) throughout the day. On average each year, Castle Rock experiences 81 days above 25 °C (77.0 °F) and 164 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Castle Rock, Colorado, United States. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to June 2022.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Maximum 17°C
(62°F)		 22°C
(72°F)		 24°C
(76°F)		 27°C
(82°F)		 31°C
(88°F)		 35°C
(96°F)		 35°C
(95°F)		 33°C
(92°F)		 33°C
(92°F)		 28°C
(83°F)		 24°C
(75°F)		 21°C
(70°F)
Mean maximum 14°C
(57°F)		 16°C
(62°F)		 20°C
(68°F)		 24°C
(75°F)		 27°C
(82°F)		 30°C
(87°F)		 34°C
(93°F)		 32°C
(89°F)		 33°C
(91°F)		 27°C
(80°F)		 21°C
(70°F)		 16°C
(60°F)
Average high 5°C
(42°F)		 5°C
(41°F)		 10°C
(50°F)		 14°C
(57°F)		 19°C
(66°F)		 26°C
(79°F)		 29°C
(84°F)		 28°C
(82°F)		 25°C
(77°F)		 16°C
(61°F)		 11°C
(52°F)		 7°C
(45°F)
Daily mean -3°C
(27°F)		 -3°C
(26°F)		 2°C
(36°F)		 6°C
(43°F)		 11°C
(53°F)		 18°C
(65°F)		 21°C
(70°F)		 20°C
(68°F)		 17°C
(62°F)		 8°C
(46°F)		 2°C
(37°F)		 -1°C
(30°F)
Average low -10°C
(15°F)		 -10°C
(14°F)		 -5°C
(23°F)		 -1°C
(30°F)		 4°C
(40°F)		 10°C
(51°F)		 13°C
(56°F)		 12°C
(55°F)		 9°C
(48°F)		 0°C
(33°F)		 -5°C
(24°F)		 -8°C
(18°F)
Mean minimum -22°C
(-7°F)		 -23°C
(-10°F)		 -17°C
(2°F)		 -11°C
(12°F)		 -4°C
(26°F)		 4°C
(39°F)		 9°C
(48°F)		 9°C
(48°F)		 2°C
(35°F)		 -13°C
(8°F)		 -14°C
(7°F)		 -17°C
(1°F)
Minimum -26°C
(-15°F)		 -30°C
(-22°F)		 -24°C
(-10°F)		 -18°C
(0°F)		 -8°C
(17°F)		 2°C
(35°F)		 8°C
(47°F)		 7°C
(45°F)		 -4°C
(26°F)		 -23°C
(-9°F)		 -23°C
(-9°F)		 -21°C
(-5°F)

Compare climate in Castle Rock with other places

Compare temperature, precipitation, sunshine, UV index in Castle Rock, Colorado, United States with other places around the world.

Monthly average precipitation in Castle Rock, Colorado, United States §

Castle Rock usually has the most precipitation in March, May and July, with an average of 10 rainy days and 68 mm (2.7 inches) of precipitation per month. The driest months in Castle Rock are January, November and December. On average, 15 mm (0.6 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Castle Rock, Colorado, United States. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to January 2022.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Average precipitation mm (inches) 17 (0.7) 22 (0.9) 59 (2.3) 42 (1.7) 87 (3.4) 45 (1.8) 59 (2.3) 42 (1.6) 34 (1.3) 33 (1.3) 20 (0.8) 9 (0.4)
Average precipitation days (≥ 1 mm) 3 7 7 9 14 8 11 9 6 6 4 3

Monthly sunshine hours in Castle Rock, Colorado, United States §

The sunniest months in Castle Rock are June, July and August, when the sun shines an average of 11 hours 49 minutes a day. Least sunny months in Castle Rock: January, February and December receive an average of 7 hours 25 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Castle Rock, Colorado, United States. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2017 to January 2022.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Mean monthly sunshine hours 189 241 291 310 332 364 371 352 307 273 249 244
Mean daily daylight hours 9h 44m 10h 43m 11h 58m 13h 16m 14h 20m 14h 53m 14h 35m 13h 37m 12h 23m 11h 6m 9h 59m 9h 25m

Solar UV radiation in Castle Rock, Colorado, United States §

Castle Rock experiences the highest level of ultraviolet (UV) radiation in May, June and July, when the maximum UV index can reach values of 12 - 12, which corresponds to the Extreme category of sun exposure. January, November and December are in the Moderate exposure category. In these months, the maximum values of the UV index do not exceed 5. For more detailed information, check out our hourly Castle Rock UV Index data.

Average daily maximum UV levels by month for Castle Rock, Colorado, United States. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2022 to January 2023.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
UV Index (month maximum) 4 6 9 11 12 12 12 11 10 7 5 4

Detailed Monthly Weather Insights for Castle Rock, Colorado, United States

Discover in-depth weather details for every month in Castle Rock. Click through the links below for comprehensive overviews of temperature trends, precipitation levels, sunshine hours, and solar UV radiation specifics. Whether planning a visit or simply curious about Castle Rock's climate nuances, these monthly breakdowns provide the information you need for an informed understanding of what to expect throughout the year.

Each link leads to a detailed account of the typical weather conditions for that month, providing both locals and tourists with vital information to plan their daily activities, wardrobe, and travel itineraries accordingly.