Last updated: June 24, 2025
In December, the average temperature in _ Westfield, United States _ hovers around -3°C (27°F), with extremes that can plunge to a chilling -25°C (-13°F) or soar to a comfortable 17°C (62°F). Expect about 48 mm (1.9 in) of precipitation over the month, spread across roughly 7 days. Don't forget your layers; the average humidity sits at a notable 81%, adding a brisk touch to the air!
In December in Westfield, the average temperature is -3°C (27°F), with maximums reaching up to 17°C (62°F) and minimums dropping as low as -25°C (-13°F). Travelers should be prepared for a wide range of temperatures and dress accordingly for both chilly and milder conditions.
In Westfield in December, the total precipitation amount is 48 mm (1.9 in) over a span of 7 days.
In Westfield in December humidity is 81%. With an average temperature of -3°C (27°F), this humidity feels like a biting chill that seeps into your bones, making traveling uncomfortable and forcing you to bundle up tightly to fend off the cold dampness.
In Westfield 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 Westfield, you can visit Hourly UV Index in Westfield.
UV Risk Categories
Weather in Westfield varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Westfield, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -7°C (20°F) | 42 mm (1.6 inches) | 85% | low |
| February Weather | -7°C (20°F) | 53 mm (2.1 inches) | 85% | moderate |
| March Weather | 1°C (34°F) | 63 mm (2.5 inches) | 85% | moderate |
| April Weather | 7°C (44°F) | 96 mm (3.8 inches) | 85% | very high |
| May Weather | 15°C (59°F) | 114 mm (4.5 inches) | 78% | very high |
| June Weather | 21°C (70°F) | 111 mm (4.4 inches) | 80% | very high |
| July Weather | 23°C (74°F) | 117 mm (4.6 inches) | 78% | very high |
| August Weather | 21°C (70°F) | 115 mm (4.5 inches) | 76% | very high |
| September Weather | 17°C (64°F) | 95 mm (3.7 inches) | 79% | high |
| October Weather | 10°C (50°F) | 102 mm (4.0 inches) | 83% | moderate |
| November Weather | 2°C (35°F) | 49 mm (1.9 inches) | 88% | moderate |
| December Weather | -3°C (27°F) | 48 mm (1.9 inches) | 81% | low |