Last updated: June 24, 2025
In December, the average temperature in Boylston, United States hovers around 0°C (32°F). Expect a chilly range, with minimum temperatures dipping to -21°C (-5°F) and reaching a maximum of 17°C (62°F). During this month, anticipate 125 mm (4.9 in) of precipitation spread over approximately 10 days, contributing to an average humidity level of 81%. Prepare accordingly for a mix of winter's chill and the potential for wet weather!
In December in Boylston, the average temperature is 0°C (32°F). The maximum can reach 17°C (62°F), while the minimum can drop as low as -21°C (-5°F). Travelers should be prepared for a wide range of temperatures, ensuring both warm and warm clothing options are packed.
In Boylston in December, the precipitation amount is 125 mm (4.9 in) spread over a period of 10 days.
In Boylston in December, humidity is 81%. With an average temperature of 0°C (32°F), this humidity feels like a damp chill that seeps into your bones, making outdoor activities less enjoyable and requiring extra layers to stay warm and dry while traveling.
In Boylston 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 Boylston, you can visit Hourly UV Index in Boylston.
UV Risk Categories
Weather in Boylston varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Boylston, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -2°C (28°F) | 74 mm (2.9 inches) | 86% | moderate |
| February Weather | -1°C (31°F) | 90 mm (3.5 inches) | 84% | moderate |
| March Weather | 2°C (36°F) | 87 mm (3.4 inches) | 82% | high |
| April Weather | 8°C (47°F) | 132 mm (5.2 inches) | 80% | very high |
| May Weather | 14°C (58°F) | 91 mm (3.6 inches) | 72% | very high |
| June Weather | 20°C (68°F) | 93 mm (3.7 inches) | 72% | very high |
| July Weather | 23°C (73°F) | 154 mm (6.1 inches) | 67% | very high |
| August Weather | 22°C (72°F) | 99 mm (3.9 inches) | 66% | very high |
| September Weather | 18°C (65°F) | 89 mm (3.5 inches) | 71% | high |
| October Weather | 12°C (54°F) | 137 mm (5.4 inches) | 78% | high |
| November Weather | 5°C (41°F) | 102 mm (4.0 inches) | 84% | moderate |
| December Weather | 0°C (32°F) | 125 mm (4.9 inches) | 81% | low |