Last updated: June 24, 2025
In December, the average temperature in Westwood, United States hovers around 1°C (33°F). Expect a chilly range, with minimums dipping to -24°C (-10°F) and maximums peaking at 17°C (62°F). During this time, anticipate approximately 65 mm (2.6 in) of precipitation spread over 11 days, contributing to a staggering average humidity of 86%. Stay warm and prepared for a mix of weather!
In December in Westwood, the average temperature is 1°C (33°F). Maximum temperatures can reach 17°C (62°F), while minimums can plummet to as low as -24°C (-10°F). Be sure to pack for both chilly and mild conditions when traveling during this time.
In Westwood in December, the precipitation amount is 65 mm (2.6 in) over a span of 11 days.
In Westwood in December humidity is 86%. With average temperature 1°C (33°F), this humidity feels like a biting chill that seeps into your bones, making travel uncomfortable and necessitating extra layers for warmth to counteract the dampness in the air.
In Westwood 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 Westwood, you can visit Hourly UV Index in Westwood.
UV Risk Categories
Weather in Westwood varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Westwood, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -3°C (27°F) | 74 mm (2.9 inches) | 87% | moderate |
| February Weather | -2°C (28°F) | 75 mm (3.0 inches) | 87% | moderate |
| March Weather | 3°C (38°F) | 86 mm (3.4 inches) | 86% | high |
| April Weather | 8°C (47°F) | 99 mm (3.9 inches) | 87% | very high |
| May Weather | 15°C (60°F) | 158 mm (6.2 inches) | 82% | very high |
| June Weather | 21°C (71°F) | 131 mm (5.1 inches) | 81% | very high |
| July Weather | 24°C (75°F) | 111 mm (4.4 inches) | 78% | very high |
| August Weather | 22°C (72°F) | 83 mm (3.3 inches) | 79% | very high |
| September Weather | 19°C (66°F) | 88 mm (3.5 inches) | 79% | high |
| October Weather | 12°C (54°F) | 141 mm (5.6 inches) | 82% | moderate |
| November Weather | 4°C (39°F) | 72 mm (2.8 inches) | 87% | moderate |
| December Weather | 1°C (33°F) | 65 mm (2.6 inches) | 86% | low |