Last updated: June 24, 2025
In December, the average temperature in Chelsea, United States hovers around 0°C (33°F). Expect chilly days with minimum temperatures dipping as low as -24°C (-10°F) and occasionally warming up to 17°C (62°F). You might also encounter 53 mm (2.1 in) of precipitation over 9 days, contributing to a high average humidity of 86%. Prepare accordingly for a potentially brisk and wet month!
In December in Chelsea, the average temperature is 0°C (33°F). Maximums can reach 17°C (62°F), while minimums can drop as low as -24°C (-10°F). Overall, travelers should be prepared for a wide range of temperatures, so layers and warm clothing are essential.
In Chelsea in December, the total precipitation amount is 53 mm (2.1 in) spread over 9 days.
In Chelsea in December humidity is 86%. With an average temperature of 0°C (33°F), this humidity feels like a damp chill that permeates your clothes, making traveling uncomfortable and necessitating warm, layered clothing to stay dry and cozy.
In Chelsea 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 Chelsea, you can visit Hourly UV Index in Chelsea.
UV Risk Categories
Weather in Chelsea varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Chelsea, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -3°C (27°F) | 64 mm (2.5 inches) | 88% | low |
| February Weather | -2°C (28°F) | 67 mm (2.6 inches) | 87% | moderate |
| March Weather | 3°C (37°F) | 77 mm (3.0 inches) | 85% | moderate |
| April Weather | 8°C (47°F) | 90 mm (3.6 inches) | 86% | very high |
| May Weather | 15°C (60°F) | 120 mm (4.7 inches) | 80% | very high |
| June Weather | 21°C (70°F) | 82 mm (3.2 inches) | 80% | very high |
| July Weather | 24°C (75°F) | 95 mm (3.8 inches) | 80% | very high |
| August Weather | 22°C (72°F) | 65 mm (2.5 inches) | 80% | very high |
| September Weather | 19°C (66°F) | 69 mm (2.7 inches) | 80% | high |
| October Weather | 12°C (54°F) | 104 mm (4.1 inches) | 84% | moderate |
| November Weather | 4°C (39°F) | 76 mm (3.0 inches) | 89% | moderate |
| December Weather | 0°C (33°F) | 53 mm (2.1 inches) | 86% | low |