Last updated: June 24, 2025
In December, the average temperature in Hopkinton, United States hovers around -2°C (29°F). However, be prepared for extremes: temperatures can dip as low as -22°C (-7°F) or soar to a pleasant 15°C (60°F). Rainfall is also a factor, with an average precipitation of 115 mm (4.5 in) spread over 9 days. Plus, expect the air to feel quite humid, with average humidity levels around 81%.
In December in Hopkinton, the average temperature is -2°C (29°F). The maximum can reach 15°C (60°F) and the minimum can be as low as -22°C (-7°F). Be prepared for a wide range of temperatures and pack accordingly when traveling to Hopkinton during this month.
In Hopkinton in December, the precipitation amount is 115 mm (4.5 in) over the course of 9 days, indicating a relatively wet period for the region.
In Hopkinton in December humidity is 81%. With an average temperature of -2°C (29°F), this humidity feels like an uncomfortable chill that seeps into your bones, making outdoor activities less enjoyable and requiring extra layers to stay warm while traveling.
In Hopkinton 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 Hopkinton, you can visit Hourly UV Index in Hopkinton.
UV Risk Categories
Weather in Hopkinton varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Hopkinton, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -4°C (25°F) | 70 mm (2.8 inches) | 86% | moderate |
| February Weather | -3°C (27°F) | 83 mm (3.3 inches) | 84% | moderate |
| March Weather | 1°C (34°F) | 77 mm (3.0 inches) | 82% | moderate |
| April Weather | 7°C (45°F) | 127 mm (5.0 inches) | 80% | very high |
| May Weather | 14°C (57°F) | 78 mm (3.1 inches) | 72% | very high |
| June Weather | 20°C (68°F) | 85 mm (3.4 inches) | 72% | very high |
| July Weather | 22°C (73°F) | 136 mm (5.3 inches) | 67% | very high |
| August Weather | 21°C (71°F) | 93 mm (3.7 inches) | 66% | very high |
| September Weather | 17°C (64°F) | 76 mm (3.0 inches) | 71% | high |
| October Weather | 11°C (52°F) | 130 mm (5.1 inches) | 78% | moderate |
| November Weather | 3°C (38°F) | 105 mm (4.1 inches) | 84% | moderate |
| December Weather | -2°C (29°F) | 115 mm (4.5 inches) | 81% | low |