nomadseason

Monthly climate in Grand Junction, Colorado, United States

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification Grand Junction features a humid continental climate (Dfb).Temperatures typically range between -4 °C (24 °F) and 25 °C (77 °F) through the year, but rarely can drop to -23 °C (-10 °F) or can rise to as high as 38 °C (101 °F).The average annual precipitation amounts to about 478 mm (18.8 inches) and receives 84 rainy days on the 1 mm (0.04 inches) threshold annually.Grand Junction enjoys an average of 3524 hours of sunshine throughout the year, and daylight varies from 9 hours 27 minutes to 14 hours 51 minutes per day.

Monthly average temperatures in Grand Junction, Colorado, United States §

The warmest months in Grand Junction are June, July and August, with daily mean temperatures ranging from 22 to 25 °C (72 - 77 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from -4 to -2 °C (24 - 29 °F) throughout the day. On average each year, Grand Junction experiences 103 days above 25 °C (77.0 °F) and 132 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Grand Junction, 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 12°C
(54°F)		 14°C
(57°F)		 23°C
(74°F)		 27°C
(81°F)		 32°C
(90°F)		 38°C
(100°F)		 38°C
(101°F)		 36°C
(97°F)		 35°C
(96°F)		 27°C
(81°F)		 20°C
(68°F)		 15°C
(59°F)
Mean maximum 8°C
(46°F)		 11°C
(51°F)		 19°C
(66°F)		 25°C
(77°F)		 29°C
(85°F)		 33°C
(91°F)		 37°C
(98°F)		 35°C
(95°F)		 34°C
(93°F)		 25°C
(78°F)		 18°C
(64°F)		 10°C
(50°F)
Average high 2°C
(36°F)		 4°C
(40°F)		 10°C
(51°F)		 17°C
(63°F)		 22°C
(73°F)		 30°C
(86°F)		 32°C
(91°F)		 31°C
(89°F)		 27°C
(80°F)		 17°C
(62°F)		 11°C
(53°F)		 4°C
(39°F)
Daily mean -4°C
(24°F)		 -2°C
(29°F)		 4°C
(39°F)		 9°C
(49°F)		 15°C
(59°F)		 22°C
(72°F)		 25°C
(77°F)		 23°C
(74°F)		 19°C
(66°F)		 9°C
(49°F)		 4°C
(39°F)		 -3°C
(28°F)
Average low -10°C
(14°F)		 -8°C
(18°F)		 -2°C
(29°F)		 2°C
(36°F)		 7°C
(45°F)		 13°C
(56°F)		 17°C
(63°F)		 16°C
(60°F)		 11°C
(52°F)		 3°C
(37°F)		 -2°C
(29°F)		 -8°C
(18°F)
Mean minimum -20°C
(-3°F)		 -18°C
(-0°F)		 -11°C
(13°F)		 -4°C
(24°F)		 1°C
(34°F)		 6°C
(43°F)		 12°C
(53°F)		 11°C
(52°F)		 3°C
(38°F)		 -7°C
(19°F)		 -9°C
(15°F)		 -18°C
(-1°F)
Minimum -23°C
(-9°F)		 -23°C
(-10°F)		 -17°C
(2°F)		 -7°C
(21°F)		 -3°C
(27°F)		 2°C
(37°F)		 9°C
(49°F)		 8°C
(46°F)		 0°C
(33°F)		 -14°C
(7°F)		 -16°C
(4°F)		 -22°C
(-8°F)

Compare climate in Grand Junction with other places

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

Monthly average precipitation in Grand Junction, Colorado, United States §

Grand Junction usually has the most precipitation in February, March and October, with an average of 9 rainy days and 58 mm (2.3 inches) of precipitation per month.The driest months in Grand Junction are June, August and November. On average, 26 mm (1.0 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Grand Junction, 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) 40 (1.6) 49 (1.9) 69 (2.7) 33 (1.3) 42 (1.7) 26 (1.0) 34 (1.3) 29 (1.1) 40 (1.6) 55 (2.2) 23 (0.9) 37 (1.5)
Average precipitation days (≥ 1 mm) 7 9 11 8 8 4 7 5 6 8 4 7

Monthly sunshine hours in Grand Junction, Colorado, United States §

The sunniest months in Grand Junction are May, June and July, when the sun shines an average of 12 hours 13 minutes a day.Least sunny months in Grand Junction: January, February and December receive an average of 6 hours 44 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Grand Junction, 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 172 221 277 313 360 382 382 358 315 278 243 219
Mean daily daylight hours 9h 45m 10h 44m 11h 58m 13h 15m 14h 19m 14h 51m 14h 33m 13h 36m 12h 23m 11h 7m 10h 0m 9h 27m

Solar UV radiation in Grand Junction, Colorado, United States §

Grand Junction experiences the highest level of ultraviolet (UV) radiation in June, July and August, when the maximum UV index can reach values of 11 - 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 Grand Junction UV Index data.

Average daily maximum UV levels by month for Grand Junction, 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 7 8 10 11 12 12 11 10 7 5 4