Last updated: June 24, 2025
In December, the average temperature in Foster Brook, United States hovers around -1°C (31°F). During this month, temperatures can dip as low as -25°C (-13°F) or rise to a pleasant 15°C (59°F). Rainfall is fairly common, with an average precipitation of 92 mm (3.6 in) over approximately 15 days. You'll also find the atmosphere quite humid, with an average humidity level of 88%.
In December in Foster Brook, the average temperature is -1°C (31°F), with maximums reaching up to 15°C (59°F) and minimums dipping as low as -25°C (-13°F). This dramatic temperature range makes it essential for travelers to prepare for both chilly days and surprisingly mild spells.
In Foster Brook in December, the precipitation amount is 92 mm (3.6 in) distributed over 15 days.
In Foster Brook in December, humidity is 88%. With an average temperature of -1°C (31°F), this humidity feels like a biting cold that penetrates your clothing, making outdoor exploration challenging and the air clingy, adding an extra chill that can make you feel even colder than the temperature suggests.
In Foster Brook 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 Foster Brook, you can visit Hourly UV Index in Foster Brook.
UV Risk Categories
Weather in Foster Brook varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Foster Brook, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -4°C (25°F) | 86 mm (3.4 inches) | 89% | moderate |
| February Weather | -3°C (28°F) | 101 mm (4.0 inches) | 90% | moderate |
| March Weather | 1°C (34°F) | 91 mm (3.6 inches) | 89% | high |
| April Weather | 7°C (45°F) | 117 mm (4.6 inches) | 88% | very high |
| May Weather | 14°C (57°F) | 130 mm (5.1 inches) | 80% | very high |
| June Weather | 18°C (65°F) | 117 mm (4.6 inches) | 79% | very high |
| July Weather | 21°C (70°F) | 116 mm (4.6 inches) | 74% | very high |
| August Weather | 20°C (68°F) | 90 mm (3.6 inches) | 64% | very high |
| September Weather | 17°C (62°F) | 93 mm (3.7 inches) | 67% | very high |
| October Weather | 11°C (52°F) | 123 mm (4.8 inches) | 81% | high |
| November Weather | 3°C (37°F) | 94 mm (3.7 inches) | 89% | moderate |
| December Weather | -1°C (31°F) | 92 mm (3.6 inches) | 88% | low |