Last updated: June 24, 2025
In December, the average temperature in Windham, United States hovers around 1°C (35°F), making it a chilly time of year. Be prepared for a wide range of temperatures, where the minimum can plunge to -16°C (3°F), while the maximum can reach a mild 17°C (64°F). During this month, anticipate 90 mm (3.6 in) of precipitation spread over about 11 days, contributing to an average humidity of 86%. Stay warm and dry!
In December in Windham, the average temperature is 1°C (35°F). The maximum can reach 17°C (64°F) and the minimum can be as low as -16°C (3°F). Be prepared for a wide range of temperatures during your visit, so pack accordingly!
In Windham in December, the precipitation amount is 90 mm (3.6 in) spread over 11 days.
In Windham in December, humidity is 86%. With an average temperature of 1°C (35°F), this humidity feels like a biting chill that wraps around you, making outdoor exploration uncomfortable and requiring extra layers to stay warm while navigating the damp air.
In Windham 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 Windham, you can visit Hourly UV Index in Windham.
UV Risk Categories
Weather in Windham varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Windham, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -2°C (29°F) | 86 mm (3.4 inches) | 88% | moderate |
| February Weather | 0°C (32°F) | 95 mm (3.8 inches) | 88% | moderate |
| March Weather | 4°C (39°F) | 107 mm (4.2 inches) | 87% | high |
| April Weather | 9°C (49°F) | 131 mm (5.2 inches) | 87% | very high |
| May Weather | 16°C (61°F) | 125 mm (4.9 inches) | 81% | very high |
| June Weather | 21°C (69°F) | 141 mm (5.5 inches) | 83% | very high |
| July Weather | 23°C (74°F) | 140 mm (5.5 inches) | 82% | very high |
| August Weather | 22°C (72°F) | 104 mm (4.1 inches) | 76% | very high |
| September Weather | 19°C (67°F) | 109 mm (4.3 inches) | 77% | very high |
| October Weather | 13°C (56°F) | 112 mm (4.4 inches) | 82% | high |
| November Weather | 5°C (41°F) | 94 mm (3.7 inches) | 89% | moderate |
| December Weather | 1°C (35°F) | 90 mm (3.6 inches) | 86% | low |