Colorado weather in December
December is one of the least pleasant months in Colorado: highs of 4°C (39°F) and about 19 mm (0.7 in) of rain on average. Nights average -8°C (18°F) and cloud cover 56% (NASA POWER, 2001–2025 averages). It is the 3rd driest month of the year and the coolest. Compared with November, it is cooler and about as wet; January brings highs of 4°C (40°F) and 17 mm (0.7 in) of rain.
Figures are long-term averages for Denver, the largest city in Colorado. See below for other places.
Is December a good time to visit Colorado?
least pleasant month Weather score 46/100.
December is one of the least pleasant months for weather in Colorado. For better conditions, consider May–Oct.
Does it rain a lot in Colorado in December?
No, it is usually dry: about 19 mm (0.7 in) falls in an average December. It is the 3rd driest month of the year.
How warm is Colorado in December?
Days average 4°C (39°F) and nights -8°C (18°F).
Colorado weather by month
| Month | High | Low | Rain | Cloud | Weather |
|---|---|---|---|---|---|
| January | 4°C (40°F) | -7°C (19°F) | 17 mm | 56% | least pleasant |
| February | 5°C (41°F) | -8°C (18°F) | 21 mm | 57% | least pleasant |
| March | 10°C (51°F) | -4°C (25°F) | 34 mm | 55% | least pleasant |
| April | 15°C (59°F) | -1°C (31°F) | 51 mm | 55% | fair |
| May | 21°C (69°F) | 4°C (40°F) | 58 mm | 56% | best |
| June | 28°C (83°F) | 11°C (51°F) | 42 mm | 46% | best |
| July | 30°C (86°F) | 15°C (58°F) | 62 mm | 47% | best |
| August | 28°C (83°F) | 13°C (55°F) | 52 mm | 47% | best |
| September | 24°C (76°F) | 8°C (47°F) | 36 mm | 38% | best |
| October | 17°C (62°F) | 1°C (34°F) | 30 mm | 44% | best |
| November | 10°C (49°F) | -4°C (25°F) | 18 mm | 48% | least pleasant |
| December | 4°C (39°F) | -8°C (18°F) | 19 mm | 56% | least pleasant |
Sources: 2001–2025 monthly averages from NASA POWER (MERRA-2 reanalysis). Page updated . How we rate months
Weather across Colorado in December
Weather can differ a lot within Colorado: coasts, hills and mountains each have their own climate.
| Place | High | Low | Rain | Weather |
|---|---|---|---|---|
| Denver | 4°C (39°F) | -8°C (18°F) | 19 mm | least pleasant |
| Colorado Springs | 3°C (37°F) | -10°C (15°F) | 14 mm | least pleasant |
| Aurora | 4°C (39°F) | -8°C (18°F) | 19 mm | least pleasant |
| Fort Collins | 4°C (39°F) | -7°C (20°F) | 21 mm | least pleasant |
| Lakewood | 4°C (39°F) | -8°C (18°F) | 19 mm | least pleasant |
| Thornton | 4°C (40°F) | -7°C (20°F) | 21 mm | least pleasant |
| Westminster | 4°C (40°F) | -7°C (20°F) | 21 mm | least pleasant |
| Arvada | 4°C (40°F) | -7°C (20°F) | 21 mm | least pleasant |
| Centennial | 4°C (39°F) | -8°C (18°F) | 19 mm | least pleasant |
| Pueblo | 6°C (43°F) | -6°C (22°F) | 11 mm | least pleasant |
| Greeley | 4°C (39°F) | -7°C (20°F) | 21 mm | least pleasant |
| Boulder | 4°C (40°F) | -7°C (20°F) | 21 mm | least pleasant |