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January Weather in Hartford, United States

Last updated: June 24, 2025

In January, the average temperature in Hartford, United States hovers around 5°C (42°F). Temperatures can vary significantly, dipping as low as -16°C (3°F) and soaring to a pleasant 24°C (75°F). Expect about 74 mm (2.9 in) of precipitation over 8 days, contributing to an average humidity level of 82%. 🌧️

January Temperature in Hartford

In January in Hartford, the average temperature is 5°C (42°F). The maximum can reach 24°C (75°F), while the minimum can drop as low as -16°C (3°F). This wide range of temperatures means visitors should be prepared for both mild and chilly weather when traveling.

January Weather in Hartford: Daily Temperature Highs, Lows, and Averages

The chart illustrates January temperature patterns in Hartford, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Hartford, January typically has an average temperature of 5°C (42°F), with highs reaching up to 24°C (75°F) and lows dropping to around -16°C (3°F).
JanFebMarAprMayJunJulAugSepOctNovDec414455607078818076635146
Data source: Temperature data for Hartford 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 Hartford

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

January Precipitation Trends in Hartford

The chart displays monthly precipitation patterns in Hartford, 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 Hartford, January typically receives around 74 mm (2.9 inches) of precipitation spread over approximately 8 days.
JanFebMarAprMayJunJulAugSepOctNovDec751201141371888782106611236285
Data source: Precipitation data for January generated using information from the Copernicus Climate Change Service.
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January Humidity in Hartford

In Hartford in January humidity is 82%. With an average temperature of 5°C (42°F), this humidity feels like a wet chill that seeps into your bones, making outdoor exploration uncomfortable and dampening the joy of traveling.

January Average Humidity in Hartford

This chart illustrates the average monthly humidity levels in Hartford, 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 Hartford is approximately 82%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec82%79%77%78%82%81%75%61%59%69%82%88%
Data source: Humidity data for January generated using information from the Copernicus Climate Change Service.

January UV Index in Hartford

In Hartford in January, the maximum UV index reaches 4, which corresponds to a moderate Exposure Category. With a time to burn of 30 minutes, it’s important to take precautions to protect your skin. You can find more details in the Hourly UV Index in Hartford for better planning.

Maximum UV Index Levels in Hartford for January

The chart shows the monthly maximum UV Index (UVI) for Hartford 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 Hartford typically reaches 4, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec46710111111109754
Data source: Hartford 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 Hartford Compares to Other Months

Weather in Hartford varies notably across the year, with each month offering distinct climate conditions. This page compares January’s weather to other months in Hartford, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in Hartford, showing how January’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather5°C (42°F)74 mm (2.9 inches)82%moderate
February Weather7°C (45°F)119 mm (4.7 inches)79%high
March Weather13°C (55°F)114 mm (4.5 inches)77%high
April Weather16°C (61°F)137 mm (5.4 inches)78%very high
May Weather21°C (70°F)188 mm (7.4 inches)82%extreme
June Weather26°C (78°F)87 mm (3.4 inches)81%extreme
July Weather27°C (82°F)82 mm (3.2 inches)75%extreme
August Weather26°C (80°F)106 mm (4.2 inches)61%very high
September Weather24°C (76°F)61 mm (2.4 inches)59%very high
October Weather17°C (63°F)123 mm (4.8 inches)69%high
November Weather11°C (51°F)62 mm (2.5 inches)82%moderate
December Weather8°C (47°F)85 mm (3.4 inches)87%moderate

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