Last updated: June 24, 2025
In December, the average temperature in Littleton, United States hovers around -6°C (22°F), with extremes ranging from a chilly -30°C (-21°F) to a mild 13°C (56°F). Expect 100 mm (3.9 in) of precipitation spread over approximately 15 days, and be prepared for a high average humidity of 85%. Stay cozy and ready for the wet, cold days ahead!
In December in Littleton, the average temperature is -6°C (22°F). The maximum can reach 13°C (56°F), while the minimum can plunge as low as -30°C (-21°F). Be sure to dress warmly and prepare for a wide range of temperatures if you plan to travel during this time.
In Littleton in December, the precipitation amount is 100 mm (3.9 in) over a span of 15 days.
In Littleton in December humidity is 85%. With an average temperature of -6°C (22°F), this humidity feels like an icy mist clinging to your skin, making outdoor activities uncomfortably chilly and causing your breath to cloud in the cold air, leaving you yearning for warmth and cozy indoor retreats while traveling.
In Littleton in December, the maximum UV index is 2, which corresponds to a low exposure category. With this level of UV radiation, the time to burn is approximately 45 minutes. To learn more about the hourly UV index in Littleton, you can visit Hourly UV Index in Littleton.
UV Risk Categories
Weather in Littleton varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Littleton, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -8°C (17°F) | 86 mm (3.4 inches) | 91% | low |
| February Weather | -7°C (20°F) | 85 mm (3.4 inches) | 89% | moderate |
| March Weather | -3°C (27°F) | 77 mm (3.0 inches) | 85% | high |
| April Weather | 4°C (40°F) | 125 mm (4.9 inches) | 84% | very high |
| May Weather | 12°C (53°F) | 104 mm (4.1 inches) | 78% | very high |
| June Weather | 17°C (62°F) | 109 mm (4.3 inches) | 72% | very high |
| July Weather | 19°C (67°F) | 119 mm (4.7 inches) | 75% | very high |
| August Weather | 18°C (66°F) | 91 mm (3.6 inches) | 74% | very high |
| September Weather | 15°C (58°F) | 69 mm (2.7 inches) | 77% | high |
| October Weather | 8°C (47°F) | 140 mm (5.5 inches) | 85% | moderate |
| November Weather | 0°C (32°F) | 116 mm (4.6 inches) | 86% | moderate |
| December Weather | -6°C (22°F) | 100 mm (3.9 inches) | 85% | low |