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January Weather in New Haven, United States

Last updated: June 24, 2025

In January, the average temperature in New Haven, United States hovers around -2°C (29°F). Temperatures can dip as low as -26°C (-14°F), while occasionally peaking at a milder 18°C (64°F). Expect approximately 74 mm (2.9 in) of precipitation spread over 8 days, along with a high average humidity of 85%.

January Temperature in New Haven

In January in New Haven, the average temperature is -2°C (29°F). Maximums can reach 18°C (64°F), while minimums can drop as low as -26°C (-14°F). Be prepared for a wide range of temperatures, making layering essential for your travels.

January Weather in New Haven: Daily Temperature Highs, Lows, and Averages

The chart illustrates January temperature patterns in New Haven, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In New Haven, January typically has an average temperature of -2°C (29°F), with highs reaching up to 18°C (64°F) and lows dropping to around -26°C (-14°F).
JanFebMarAprMayJunJulAugSepOctNovDec283140506272767368564135
Data source: Temperature data for New Haven generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

January Precipitation in New Haven

In New Haven in January, the precipitation amount is 74 mm (2.9 in) over a period of 8 days.

January Precipitation Trends in New Haven

The chart displays monthly precipitation patterns in New Haven, with values for each month alongside January’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how January’s conditions compare to those of other months. In New Haven, January typically receives around 74 mm (2.9 inches) of precipitation spread over approximately 8 days.
JanFebMarAprMayJunJulAugSepOctNovDec74801029212712110497651018261
Data source: Precipitation data for January generated using information from the Copernicus Climate Change Service.
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January Humidity in New Haven

In New Haven in January, humidity is 85%. With an average temperature of -2°C (29°F), this humidity feels like a chilling, damp blanket that clings to your skin, making travel uncomfortable and often prompting an urgent search for warmth and shelter.

January Average Humidity in New Haven

This chart illustrates the average monthly humidity levels in New Haven, with January’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In January, average humidity in New Haven is approximately 85%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec85%85%86%87%81%82%81%79%78%81%89%86%
Data source: Humidity data for January generated using information from the Copernicus Climate Change Service.

January UV Index in New Haven

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.

Maximum UV Index Levels in New Haven for January

The chart shows the monthly maximum UV Index (UVI) for New Haven in January, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In January, the maximum UV index in New Haven typically reaches 3, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec35699101098642
Data source: New Haven January UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

  •  Extreme (11+): Avoid the sun, stay in shade.
  •  Very High (8-10): Limit sun exposure.
  •  High (6-7): Use SPF 30+ and protective clothing.
  •  Moderate (3-5): Midday shade recommended.
  •  Low (0-2): No protection needed.

How January Weather in New Haven Compares to Other Months

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.

This table compares monthly weather conditions in New Haven, showing how January’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-2°C (29°F)74 mm (2.9 inches)85%moderate
February Weather-1°C (31°F)80 mm (3.2 inches)85%moderate
March Weather5°C (41°F)102 mm (4.0 inches)86%high
April Weather10°C (50°F)92 mm (3.6 inches)87%very high
May Weather17°C (63°F)127 mm (5.0 inches)81%very high
June Weather22°C (72°F)121 mm (4.8 inches)82%very high
July Weather24°C (76°F)104 mm (4.1 inches)81%very high
August Weather23°C (74°F)96 mm (3.8 inches)79%very high
September Weather20°C (68°F)65 mm (2.5 inches)78%very high
October Weather14°C (57°F)101 mm (4.0 inches)81%high
November Weather5°C (41°F)82 mm (3.2 inches)89%moderate
December Weather1°C (35°F)61 mm (2.4 inches)86%low

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