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Monthly climate in Keystone, Colorado, United States

Last updated: March 2, 2024

Under the Köppen–Geiger climate classification Keystone features a subarctic climate (Dfc). Temperatures typically range between -11 °C (13 °F) and 11 °C (53 °F) through the year, but rarely can drop to -29 °C (-20 °F) or can rise to as high as 24 °C (75 °F). The average annual precipitation amounts to about 696 mm (27.4 inches) and receives 137 rainy days on the 1 mm (0.04 inches) threshold annually. Keystone enjoys an average of 3577 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 Keystone, Colorado, United States §

The warmest months in Keystone are June, July and August, with daily mean temperatures ranging from 8 to 11 °C (46 - 53 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from -11 to -10 °C (13 - 14 °F) throughout the day. On average each year, Keystone experiences 0 days above 25 °C (77.0 °F) and 248 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Keystone, 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 5°C
(42°F)		 9°C
(48°F)		 9°C
(49°F)		 10°C
(50°F)		 17°C
(63°F)		 24°C
(75°F)		 23°C
(74°F)		 22°C
(73°F)		 22°C
(72°F)		 17°C
(63°F)		 10°C
(50°F)		 8°C
(47°F)
Mean maximum 3°C
(38°F)		 4°C
(40°F)		 7°C
(45°F)		 10°C
(49°F)		 13°C
(56°F)		 18°C
(65°F)		 23°C
(74°F)		 21°C
(70°F)		 21°C
(71°F)		 15°C
(59°F)		 8°C
(46°F)		 4°C
(40°F)
Average high -4°C
(25°F)		 -4°C
(24°F)		 0°C
(33°F)		 3°C
(38°F)		 7°C
(46°F)		 15°C
(59°F)		 19°C
(66°F)		 18°C
(65°F)		 15°C
(59°F)		 6°C
(43°F)		 1°C
(34°F)		 -4°C
(26°F)
Daily mean -11°C
(13°F)		 -10°C
(14°F)		 -5°C
(22°F)		 -3°C
(27°F)		 2°C
(35°F)		 8°C
(46°F)		 11°C
(53°F)		 11°C
(52°F)		 7°C
(46°F)		 -1°C
(31°F)		 -7°C
(20°F)		 -11°C
(13°F)
Average low -16°C
(4°F)		 -15°C
(5°F)		 -11°C
(13°F)		 -8°C
(18°F)		 -4°C
(25°F)		 0°C
(32°F)		 4°C
(39°F)		 4°C
(39°F)		 0°C
(33°F)		 -7°C
(20°F)		 -14°C
(8°F)		 -17°C
(2°F)
Mean minimum -25°C
(-13°F)		 -26°C
(-14°F)		 -20°C
(-4°F)		 -18°C
(0°F)		 -10°C
(15°F)		 -6°C
(21°F)		 -1°C
(30°F)		 1°C
(34°F)		 -6°C
(21°F)		 -19°C
(-2°F)		 -24°C
(-12°F)		 -26°C
(-15°F)
Minimum -26°C
(-15°F)		 -28°C
(-19°F)		 -25°C
(-12°F)		 -21°C
(-5°F)		 -13°C
(10°F)		 -9°C
(15°F)		 -2°C
(28°F)		 0°C
(32°F)		 -11°C
(13°F)		 -24°C
(-10°F)		 -27°C
(-17°F)		 -29°C
(-20°F)

Compare climate in Keystone with other places

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

Monthly average precipitation in Keystone, Colorado, United States §

Keystone usually has the most precipitation in April, May and July, with an average of 14 rainy days and 81 mm (3.2 inches) of precipitation per month. The driest months in Keystone are January, September and November. On average, 42 mm (1.6 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Keystone, 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) 41 (1.6) 59 (2.3) 67 (2.7) 78 (3.1) 81 (3.2) 50 (2.0) 83 (3.3) 53 (2.1) 43 (1.7) 56 (2.2) 41 (1.6) 43 (1.7)
Average precipitation days (≥ 1 mm) 10 14 14 13 14 10 15 11 9 9 8 10

Monthly sunshine hours in Keystone, Colorado, United States §

The sunniest months in Keystone are June, July and August, when the sun shines an average of 12 hours 11 minutes a day. Least sunny months in Keystone: January, February and December receive an average of 7 hours 10 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Keystone, 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 182 232 291 316 355 382 382 357 314 280 246 237
Mean daily daylight hours 9h 44m 10h 43m 11h 58m 13h 16m 14h 21m 14h 53m 14h 35m 13h 37m 12h 23m 11h 6m 9h 59m 9h 25m

Solar UV radiation in Keystone, Colorado, United States §

Keystone experiences the highest level of ultraviolet (UV) radiation in May, June and July, when the maximum UV index can reach values of 13 - 14, 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 Keystone UV Index data.

Average daily maximum UV levels by month for Keystone, 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 12 13 14 13 12 11 7 5 4

Detailed Monthly Weather Insights for Keystone, Colorado, United States

Discover in-depth weather details for every month in Keystone. 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 Keystone'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.