Last updated: June 24, 2025
In Calais, United States, the average temperature in December is a chilly -3°C (26°F). Expect extremes, with minimums plummeting to -23°C (-9°F) and maximums rising to 15°C (59°F). During this month, precipitation amounts to 122 mm (4.8 in) spread over approximately 11 days, coupled with an average humidity of 82%. Stay cozy and prepared for the weather fluctuations!
In December in Calais, the average temperature is -3°C (26°F), with maximums reaching 15°C (59°F) and minimums dropping as low as -23°C (-9°F). Be prepared for a wide range of temperatures when traveling to Calais during this month.
In Calais in December, the total precipitation amount is 122 mm (4.8 in) over a span of 11 days.
In Calais in December, humidity is 82%. With an average temperature of -3°C (26°F), this humidity feels like an uncomfortable chill that makes traveling outside feel more biting and penetrating, as the cold damp air clings to your skin, intensifying the cold sensation and making even short excursions feel more daunting.
In Calais 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 Calais, you can visit Hourly UV Index in Calais.
UV Risk Categories
Weather in Calais varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Calais, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -6°C (22°F) | 98 mm (3.9 inches) | 83% | low |
| February Weather | -5°C (23°F) | 90 mm (3.5 inches) | 84% | moderate |
| March Weather | -1°C (30°F) | 72 mm (2.8 inches) | 82% | moderate |
| April Weather | 5°C (42°F) | 119 mm (4.7 inches) | 80% | high |
| May Weather | 11°C (53°F) | 107 mm (4.2 inches) | 78% | very high |
| June Weather | 17°C (62°F) | 91 mm (3.6 inches) | 82% | very high |
| July Weather | 20°C (68°F) | 91 mm (3.6 inches) | 84% | very high |
| August Weather | 20°C (68°F) | 76 mm (3.0 inches) | 82% | very high |
| September Weather | 16°C (61°F) | 88 mm (3.5 inches) | 82% | high |
| October Weather | 10°C (50°F) | 109 mm (4.3 inches) | 82% | moderate |
| November Weather | 3°C (37°F) | 136 mm (5.4 inches) | 84% | moderate |
| December Weather | -3°C (26°F) | 122 mm (4.8 inches) | 82% | low |