Last updated: June 24, 2025
In December, the average temperature in Amherst, United States hovers around 5°C (42°F), with a range that can swing from a chilly -16°C (4°F) to a warm 21°C (71°F). Expect 105 mm (4.1 in) of precipitation spread across about 8 days, contributing to an average humidity level of 85%. Perfect for cozy indoor activities or bundling up for outdoor adventures!
In December in Amherst, the average temperature is 5°C (42°F). Maximum temperatures can reach 21°C (71°F), while minimum temperatures can drop as low as -16°C (4°F). Be prepared for a wide range of temperatures when traveling to Amherst during this month.
In Amherst in December, the precipitation amount is 105 mm (4.1 in) over the course of 8 days.
In Amherst in December, humidity is 85%. With an average temperature of 5°C (42°F), this humidity feels like a damp chill that clings to your skin, making outdoor activities uncomfortable and requiring extra layers to stay warm while exploring.
In Amherst in December, the maximum UV index is 3, which corresponds to a moderate Exposure Category. The time to burn is approximately 30 minutes. For more details on the hourly UV index in Amherst, you can check the information here.
UV Risk Categories
Weather in Amherst varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Amherst, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | 3°C (38°F) | 70 mm (2.8 inches) | 84% | moderate |
| February Weather | 6°C (44°F) | 108 mm (4.2 inches) | 84% | high |
| March Weather | 9°C (49°F) | 69 mm (2.7 inches) | 84% | very high |
| April Weather | 14°C (58°F) | 126 mm (5.0 inches) | 82% | very high |
| May Weather | 19°C (67°F) | 112 mm (4.4 inches) | 82% | very high |
| June Weather | 23°C (74°F) | 94 mm (3.7 inches) | 83% | extreme |
| July Weather | 27°C (80°F) | 55 mm (2.2 inches) | 79% | very high |
| August Weather | 25°C (77°F) | 89 mm (3.5 inches) | 77% | very high |
| September Weather | 22°C (72°F) | 102 mm (4.0 inches) | 75% | very high |
| October Weather | 17°C (62°F) | 112 mm (4.4 inches) | 81% | high |
| November Weather | 8°C (47°F) | 75 mm (3.0 inches) | 87% | moderate |
| December Weather | 5°C (42°F) | 105 mm (4.1 inches) | 85% | moderate |