Last updated: June 24, 2025
In January, the average temperature in New Haven, United States hovers around 0°C (33°F), with a range that can dip as low as -20°C (-4°F) and soar to 20°C (68°F). Expect about 74 mm (2.9 in) of precipitation spread over 7 days, contributing to an average humidity of 82%. Prepare for a month that balances chilly winds and occasional wet weather!
In January in New Haven, the average temperature is 0°C (33°F). Maximums can reach 20°C (68°F), and minimums can be as low as -20°C (-4°F). Travelers should be prepared for a wide range of temperatures and dress in layers for comfort.
In New Haven in January, the precipitation amount is 74 mm (2.9 in) over a period of 7 days.
In New Haven in January, humidity is 82%. With an average temperature of 0°C (33°F), this humidity feels like a damp chill that seeps into your bones, making outdoor adventures feel much colder than the mercury suggests, and reminding you to bundle up as you explore.
In New Haven in January, the maximum UV index is 3, which corresponds to a moderate Exposure Category. The time to burn is approximately 30 minutes. For more details on the hourly UV index in New Haven, you can check the information here.
UV Risk Categories
Weather in New Haven varies notably across the year, with each month offering distinct climate conditions. This page compares January’s weather to other months in New Haven, focusing on differences in temperature, rainfall, humidity, and UV levels.
Temperature | Precipitation | Humidity | UV | |
---|---|---|---|---|
January Weather | 0°C (33°F) | 74 mm (2.9 inches) | 82% | moderate |
February Weather | 2°C (36°F) | 79 mm (3.1 inches) | 80% | moderate |
March Weather | 8°C (47°F) | 128 mm (5.1 inches) | 80% | high |
April Weather | 13°C (55°F) | 128 mm (5.0 inches) | 80% | very high |
May Weather | 19°C (66°F) | 161 mm (6.3 inches) | 82% | very high |
June Weather | 24°C (76°F) | 87 mm (3.4 inches) | 83% | extreme |
July Weather | 26°C (79°F) | 102 mm (4.0 inches) | 81% | extreme |
August Weather | 24°C (76°F) | 141 mm (5.5 inches) | 80% | very high |
September Weather | 22°C (72°F) | 52 mm (2.0 inches) | 76% | very high |
October Weather | 15°C (59°F) | 104 mm (4.1 inches) | 76% | high |
November Weather | 7°C (45°F) | 67 mm (2.6 inches) | 85% | moderate |
December Weather | 4°C (39°F) | 51 mm (2.0 inches) | 86% | moderate |