Last updated: June 24, 2025
In December, the average temperature in Waterville, United States hovers around -1°C (30°F). Expect chilly extremes, with minimum temperatures plummeting to -22°C (-7°F) and the occasional maximum reaching up to 17°C (62°F). This month typically sees 110 mm (4.3 in) of precipitation spread over 17 days, contributing to an average humidity of 86%.
In December in Waterville, the average temperature is -1°C (30°F), with maximums reaching 17°C (62°F) and minimums dropping as low as -22°C (-7°F). It's advisable to pack warm clothing and be prepared for a wide range of temperatures if you plan to travel during this time.
In Waterville in December, the precipitation amount is 110 mm (4.3 in) spread over 17 days.
In Waterville in December, humidity is 86%. With an average temperature of -1°C (30°F), this humidity feels like a heavy blanket wrapping around you, making traveling feel much colder and more uncomfortable than the temperature suggests.
In Waterville 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 Waterville, you can visit Hourly UV Index in Waterville.
UV Risk Categories
Weather in Waterville varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Waterville, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -5°C (24°F) | 97 mm (3.8 inches) | 90% | moderate |
| February Weather | -3°C (27°F) | 106 mm (4.2 inches) | 90% | moderate |
| March Weather | 1°C (33°F) | 99 mm (3.9 inches) | 87% | high |
| April Weather | 7°C (45°F) | 125 mm (4.9 inches) | 88% | very high |
| May Weather | 14°C (57°F) | 135 mm (5.3 inches) | 82% | very high |
| June Weather | 19°C (66°F) | 122 mm (4.8 inches) | 79% | very high |
| July Weather | 22°C (71°F) | 175 mm (6.9 inches) | 78% | very high |
| August Weather | 20°C (69°F) | 136 mm (5.4 inches) | 76% | very high |
| September Weather | 17°C (63°F) | 94 mm (3.7 inches) | 78% | very high |
| October Weather | 11°C (52°F) | 175 mm (6.9 inches) | 84% | high |
| November Weather | 3°C (38°F) | 117 mm (4.6 inches) | 89% | moderate |
| December Weather | -1°C (30°F) | 110 mm (4.3 inches) | 86% | low |