nomadseason

January Weather in Trenton, United States

Last updated: June 24, 2025

In January, the average temperature in Trenton, United States hovers around -2°C (28°F), with the possibility of dipping to a chilling -25°C (-13°F) at times, while sunny days can reach a pleasant 14°C (57°F). Expect about 68 mm (2.7 in) of precipitation over 8 days, and be prepared for high humidity levels averaging 88%.

January Temperature in Trenton

In January in Trenton, the average temperature is -2°C (28°F). The maximum can reach 14°C (57°F), while the minimum can drop as low as -25°C (-13°F). It's essential to pack warm clothing and be prepared for a wide range of temperatures if you're planning to visit during this time.

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

The chart illustrates January temperature patterns in Trenton, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Trenton, January typically has an average temperature of -2°C (28°F), with highs reaching up to 14°C (57°F) and lows dropping to around -25°C (-13°F).
JanFebMarAprMayJunJulAugSepOctNovDec282937475970757367554033
Data source: Temperature data for Trenton generated using information from the Copernicus Climate Change Service.
Choose your preferred temperature unit
The average of daily temperatures (24 hours) calculated across all days in the month.

January Precipitation in Trenton

In Trenton in January, the precipitation amount is 68 mm (2.7 in) spread over 8 days.

January Precipitation Trends in Trenton

The chart displays monthly precipitation patterns in Trenton, 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 Trenton, January typically receives around 68 mm (2.7 inches) of precipitation spread over approximately 8 days.
JanFebMarAprMayJunJulAugSepOctNovDec68697389114828675611008259
Data source: Precipitation data for January generated using information from the Copernicus Climate Change Service.
Choose your preferred precipitation unit

January Humidity in Trenton

In Trenton in January humidity is 88%. With an average temperature of -2°C (28°F), this humidity feels like an icy cling to your skin, making every breath feel brisk and sharp, while the dampness cuts through layers of clothing, leaving travelers yearning for warmth and comfort.

January Average Humidity in Trenton

This chart illustrates the average monthly humidity levels in Trenton, 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 Trenton is approximately 88%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec88%87%85%86%80%80%80%81%80%84%90%86%
Data source: Humidity data for January generated using information from the Copernicus Climate Change Service.

January UV Index in Trenton

In Trenton in January, 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 Trenton, you can visit Hourly UV Index in Trenton.

Maximum UV Index Levels in Trenton for January

The chart shows the monthly maximum UV Index (UVI) for Trenton 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 Trenton typically reaches 2, which falls under the low exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec24599101098542
Data source: Trenton 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 Trenton Compares to Other Months

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

This table compares monthly weather conditions in Trenton, showing how January’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-2°C (28°F)68 mm (2.7 inches)88%low
February Weather-2°C (29°F)69 mm (2.7 inches)87%moderate
March Weather3°C (37°F)73 mm (2.9 inches)85%moderate
April Weather8°C (47°F)89 mm (3.5 inches)86%very high
May Weather15°C (60°F)114 mm (4.5 inches)80%very high
June Weather21°C (71°F)82 mm (3.2 inches)80%very high
July Weather24°C (76°F)86 mm (3.4 inches)80%very high
August Weather23°C (74°F)75 mm (3.0 inches)80%very high
September Weather19°C (67°F)61 mm (2.4 inches)80%very high
October Weather13°C (55°F)100 mm (3.9 inches)84%moderate
November Weather4°C (40°F)81 mm (3.2 inches)89%moderate
December Weather1°C (33°F)59 mm (2.3 inches)86%low

Compare Trenton's Climate with Cities Worldwide