Last updated: June 24, 2025
In December, the average temperature in Waterville, United States hovers around -2°C (29°F), with extremes dipping to a chilly -19°C (-1°F) and peaking at a mild 14°C (58°F). Expect 70 mm (2.8 in) of precipitation spread across 12 days, contributing to a high average humidity of 88%. Don't forget to bundle up!
In December in Waterville, the average temperature is -2°C (29°F). The maximum can reach 14°C (58°F), and the minimum can be as low as -19°C (-1°F). Travelers should prepare for a wide range of temperatures, from chilly days to surprisingly mild afternoons.
In Waterville in December, the precipitation amount is 70 mm (2.8 in) over the course of 12 days.
In Waterville in December, humidity is 88%. With an average temperature of -2°C (29°F), this humidity feels like a biting chill in the air that penetrates layers of clothing, making outdoor activities challenging and potentially uncomfortable for travelers.
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 | -2°C (28°F) | 76 mm (3.0 inches) | 86% | low |
| February Weather | -2°C (29°F) | 62 mm (2.4 inches) | 86% | moderate |
| March Weather | 3°C (38°F) | 41 mm (1.6 inches) | 87% | moderate |
| April Weather | 8°C (47°F) | 36 mm (1.4 inches) | 84% | high |
| May Weather | 14°C (58°F) | 22 mm (0.9 inches) | 81% | very high |
| June Weather | 18°C (65°F) | 9 mm (0.4 inches) | 82% | very high |
| July Weather | 22°C (72°F) | 2 mm (0.1 inches) | 79% | very high |
| August Weather | 22°C (71°F) | 4 mm (0.2 inches) | 63% | very high |
| September Weather | 16°C (61°F) | 23 mm (0.9 inches) | 62% | high |
| October Weather | 8°C (47°F) | 48 mm (1.9 inches) | 83% | moderate |
| November Weather | 3°C (37°F) | 57 mm (2.2 inches) | 89% | moderate |
| December Weather | -2°C (29°F) | 70 mm (2.8 inches) | 88% | low |