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Monthly climate in Granby, Colorado, United States

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification Granby features a subarctic climate (Dfc).Temperatures typically range between -9 °C (15 °F) and 15 °C (59 °F) through the year, but rarely can drop to -28 °C (-19 °F) or can rise to as high as 28 °C (82 °F).The average annual precipitation amounts to about 517 mm (20.4 inches) and receives 110 rainy days on the 1 mm (0.04 inches) threshold annually.Granby enjoys an average of 3535 hours of sunshine throughout the year, and daylight varies from 9 hours 21 minutes to 14 hours 57 minutes per day.

Monthly average temperatures in Granby, Colorado, United States §

The warmest months in Granby are June, July and August, with daily mean temperatures ranging from 11 to 15 °C (52 - 59 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from -9 to -8 °C (15 - 19 °F) throughout the day. On average each year, Granby experiences 9 days above 25 °C (77.0 °F) and 229 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Granby, 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 7°C
(44°F)		 11°C
(52°F)		 12°C
(53°F)		 14°C
(57°F)		 22°C
(72°F)		 28°C
(82°F)		 28°C
(82°F)		 27°C
(80°F)		 26°C
(80°F)		 21°C
(70°F)		 12°C
(54°F)		 9°C
(49°F)
Mean maximum 4°C
(40°F)		 6°C
(43°F)		 10°C
(50°F)		 13°C
(55°F)		 18°C
(64°F)		 22°C
(73°F)		 27°C
(81°F)		 26°C
(79°F)		 26°C
(78°F)		 18°C
(65°F)		 9°C
(49°F)		 6°C
(42°F)
Average high -3°C
(28°F)		 -2°C
(29°F)		 3°C
(38°F)		 6°C
(43°F)		 11°C
(51°F)		 19°C
(67°F)		 23°C
(73°F)		 22°C
(72°F)		 19°C
(66°F)		 9°C
(48°F)		 3°C
(38°F)		 -2°C
(29°F)
Daily mean -9°C
(16°F)		 -8°C
(19°F)		 -3°C
(27°F)		 -0°C
(32°F)		 4°C
(39°F)		 11°C
(52°F)		 15°C
(59°F)		 14°C
(58°F)		 11°C
(51°F)		 2°C
(36°F)		 -4°C
(24°F)		 -9°C
(15°F)
Average low -15°C
(6°F)		 -13°C
(9°F)		 -9°C
(16°F)		 -6°C
(21°F)		 -3°C
(26°F)		 2°C
(36°F)		 6°C
(43°F)		 6°C
(43°F)		 3°C
(37°F)		 -4°C
(24°F)		 -11°C
(12°F)		 -16°C
(3°F)
Mean minimum -26°C
(-15°F)		 -24°C
(-11°F)		 -17°C
(1°F)		 -15°C
(5°F)		 -9°C
(15°F)		 -4°C
(26°F)		 1°C
(34°F)		 3°C
(37°F)		 -4°C
(25°F)		 -18°C
(-0°F)		 -24°C
(-10°F)		 -26°C
(-15°F)
Minimum -28°C
(-19°F)		 -27°C
(-16°F)		 -23°C
(-9°F)		 -19°C
(-1°F)		 -13°C
(8°F)		 -6°C
(22°F)		 -0°C
(32°F)		 2°C
(36°F)		 -6°C
(22°F)		 -28°C
(-17°F)		 -27°C
(-16°F)		 -28°C
(-19°F)

Compare climate in Granby with other places

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

Monthly average precipitation in Granby, Colorado, United States §

Granby usually has the most precipitation in March, April and May, with an average of 12 rainy days and 61 mm (2.4 inches) of precipitation per month.The driest months in Granby are July, August and September. On average, 26 mm (1.0 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Granby, 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) 38 (1.5) 54 (2.1) 58 (2.3) 62 (2.4) 64 (2.5) 33 (1.3) 25 (1.0) 27 (1.1) 26 (1.0) 50 (2.0) 40 (1.6) 41 (1.6)
Average precipitation days (≥ 1 mm) 10 13 12 12 12 7 7 6 4 9 8 10

Monthly sunshine hours in Granby, Colorado, United States §

The sunniest months in Granby are June, July and August, when the sun shines an average of 12 hours 13 minutes a day.Least sunny months in Granby: January, February and December receive an average of 6 hours 59 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Granby, 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 178 227 287 308 350 382 384 357 313 275 240 230
Mean daily daylight hours 9h 40m 10h 41m 11h 58m 13h 18m 14h 24m 14h 57m 14h 39m 13h 39m 12h 23m 11h 5m 9h 56m 9h 21m

Solar UV radiation in Granby, Colorado, United States §

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

Average daily maximum UV levels by month for Granby, 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 13 13 12 10 7 5 4