Last updated: June 24, 2025
In December, the average temperature in Littleton, United States hovers around -6°C (21°F), with extremes ranging from a chilling -24°C (-11°F) to a milder 15°C (59°F). Expect about 113 mm (4.4 in) of precipitation spread over 10 days, contributing to an average humidity of 90%. Stay warm and prepared for the wet conditions!
In December in Littleton, the average temperature is -6°C (21°F). Maximum temperatures can reach 15°C (59°F), while minimums can plummet to as low as -24°C (-11°F). It's essential to pack warm clothing and prepare for a wide range of temperatures if you're planning to visit during this time.
In Littleton in December, the total precipitation amount is 113 mm (4.4 in) over a span of 10 days.
In Littleton in December humidity is 90%. With an average temperature of -6°C (21°F), this humidity feels like a heavy, icy mist that clings to your skin, making every breath feel sharp and cold, which can be quite challenging for 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 | -9°C (16°F) | 94 mm (3.7 inches) | 93% | low |
| February Weather | -8°C (18°F) | 83 mm (3.3 inches) | 92% | moderate |
| March Weather | -3°C (26°F) | 77 mm (3.0 inches) | 90% | moderate |
| April Weather | 4°C (40°F) | 109 mm (4.3 inches) | 87% | high |
| May Weather | 11°C (52°F) | 108 mm (4.2 inches) | 82% | very high |
| June Weather | 16°C (62°F) | 95 mm (3.8 inches) | 77% | very high |
| July Weather | 20°C (68°F) | 101 mm (4.0 inches) | 81% | very high |
| August Weather | 19°C (66°F) | 88 mm (3.5 inches) | 83% | very high |
| September Weather | 14°C (58°F) | 98 mm (3.8 inches) | 85% | high |
| October Weather | 8°C (47°F) | 118 mm (4.6 inches) | 87% | moderate |
| November Weather | 0°C (33°F) | 117 mm (4.6 inches) | 87% | moderate |
| December Weather | -6°C (21°F) | 113 mm (4.4 inches) | 90% | low |