Last updated: June 24, 2025
In December, the average temperature in Watertown, United States is a brisk 1°C (35°F), with a minimum dipping down to -19°C (-2°F) and peaking at a comfortable 17°C (63°F). Expect 118 mm (4.6 in) of precipitation spread over about 10 days, contributing to an average humidity of 81%. Whether you're braving the chill or dodging the drizzle, this month offers a unique climate experience!
In December in Watertown, the average temperature is 1°C (35°F). The maximum can reach 17°C (63°F) and the minimum can be as low as -19°C (-2°F). Be prepared for a wide range of temperatures and pack accordingly for your trip!
In Watertown in December, the total precipitation amount is 118 mm (4.6 in) over a span of 10 days.
In Watertown in December, humidity is 81%. With an average temperature of 1°C (35°F), this humidity feels like a thick, cold blanket wrapping around you, making travel uncomfortable and the air heavy, which can dampen your spirits as you navigate through the chilly conditions.
In Watertown 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 Watertown, you can visit Hourly UV Index in Watertown.
UV Risk Categories
Weather in Watertown varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Watertown, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -1°C (31°F) | 70 mm (2.8 inches) | 86% | moderate |
| February Weather | 1°C (34°F) | 86 mm (3.4 inches) | 84% | moderate |
| March Weather | 3°C (38°F) | 94 mm (3.7 inches) | 82% | moderate |
| April Weather | 9°C (49°F) | 126 mm (5.0 inches) | 80% | very high |
| May Weather | 15°C (59°F) | 90 mm (3.5 inches) | 72% | very high |
| June Weather | 20°C (69°F) | 87 mm (3.4 inches) | 72% | very high |
| July Weather | 23°C (74°F) | 126 mm (5.0 inches) | 67% | very high |
| August Weather | 23°C (74°F) | 84 mm (3.3 inches) | 66% | very high |
| September Weather | 19°C (67°F) | 84 mm (3.3 inches) | 71% | high |
| October Weather | 13°C (56°F) | 138 mm (5.4 inches) | 78% | high |
| November Weather | 6°C (43°F) | 95 mm (3.7 inches) | 84% | moderate |
| December Weather | 1°C (35°F) | 118 mm (4.6 inches) | 81% | low |