Last updated: June 24, 2025
In December, the average temperature in New Haven, United States hovers around 4°C (39°F), with a minimum dip to -12°C (11°F) and a maximum rise to 16°C (60°F). This month typically sees 160 mm (6.3 in) of precipitation spread over 11 days, contributing to an average humidity level of 80%. Prepare for a chilly and damp atmosphere!
In December in New Haven, the average temperature is 4°C (39°F). The maximum can reach 16°C (60°F), while the minimum can drop as low as -12°C (11°F). Travelers should be prepared for a wide range of temperatures and pack accordingly to enjoy their visit.
In New Haven in December, the precipitation amount is 160 mm (6.3 in) over a span of 11 days.
In New Haven in December, humidity is 80%. With an average temperature of 4°C (39°F), this humidity feels like a damp chill that seeps into your bones, making travel uncomfortable and requiring extra layers to stay warm while navigating through the misty streets.
In New Haven 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 New Haven, you can visit Hourly UV Index in New Haven.
UV Risk Categories
Weather in New Haven varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in New Haven, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | 1°C (34°F) | 90 mm (3.5 inches) | 84% | moderate |
| February Weather | 1°C (35°F) | 132 mm (5.2 inches) | 82% | moderate |
| March Weather | 4°C (39°F) | 109 mm (4.3 inches) | 81% | high |
| April Weather | 8°C (47°F) | 153 mm (6.0 inches) | 78% | very high |
| May Weather | 14°C (57°F) | 130 mm (5.1 inches) | 69% | very high |
| June Weather | 19°C (67°F) | 93 mm (3.7 inches) | 69% | very high |
| July Weather | 23°C (74°F) | 132 mm (5.2 inches) | 62% | very high |
| August Weather | 23°C (74°F) | 96 mm (3.8 inches) | 65% | very high |
| September Weather | 20°C (69°F) | 108 mm (4.3 inches) | 68% | very high |
| October Weather | 15°C (60°F) | 171 mm (6.7 inches) | 74% | high |
| November Weather | 8°C (47°F) | 112 mm (4.4 inches) | 82% | moderate |
| December Weather | 4°C (39°F) | 160 mm (6.3 inches) | 80% | low |