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January Weather in St Johnsbury, United States

Last updated: June 24, 2025

In January, the average temperature in St Johnsbury, United States hovers around -8°C (18°F). Be prepared for extreme variations, as temperatures can plummet to a chilling -35°C (-31°F) or rise to a mild 13°C (56°F). Expect about 80 mm (3.1 in) of precipitation over 12 days, contributing to an average humidity of 91%. Bundle up and stay dry!

January Temperature in St Johnsbury

In January in St Johnsbury, the average temperature is -8°C (18°F). Maximum temperatures can reach 13°C (56°F), while minimums can drop as low as -35°C (-31°F). It's essential to prepare for a wide range of temperatures when traveling during this time.

January Weather in St Johnsbury: Daily Temperature Highs, Lows, and Averages

The chart illustrates January temperature patterns in St Johnsbury, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In St Johnsbury, January typically has an average temperature of -8°C (18°F), with highs reaching up to 13°C (56°F) and lows dropping to around -35°C (-31°F).
JanFebMarAprMayJunJulAugSepOctNovDec182128425463686659483323
Data source: Temperature data for St Johnsbury 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 St Johnsbury

In St Johnsbury in January, the total precipitation amount is 80 mm (3.1 in) spread over 12 days.

January Precipitation Trends in St Johnsbury

The chart displays monthly precipitation patterns in St Johnsbury, 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 St Johnsbury, January typically receives around 80 mm (3.1 inches) of precipitation spread over approximately 12 days.
JanFebMarAprMayJunJulAugSepOctNovDec8078691109598106886413910385
Data source: Precipitation data for January generated using information from the Copernicus Climate Change Service.
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January Humidity in St Johnsbury

In St Johnsbury in January humidity is 91%. With an average temperature of -8°C (18°F), this humidity feels like an icy blanket that clings to your skin, making every step feel heavier as you navigate the frigid air while wrapped in layers, leaving you longing for warmth.

January Average Humidity in St Johnsbury

This chart illustrates the average monthly humidity levels in St Johnsbury, 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 St Johnsbury is approximately 91%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec91%89%85%84%78%72%75%74%77%85%86%85%
Data source: Humidity data for January generated using information from the Copernicus Climate Change Service.

January UV Index in St Johnsbury

In St Johnsbury 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 St Johnsbury, you can visit Hourly UV Index in St Johnsbury.

Maximum UV Index Levels in St Johnsbury for January

The chart shows the monthly maximum UV Index (UVI) for St Johnsbury 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 St Johnsbury typically reaches 2, which falls under the low exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec2458910997532
Data source: St Johnsbury 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 St Johnsbury Compares to Other Months

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

This table compares monthly weather conditions in St Johnsbury, showing how January’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-8°C (18°F)80 mm (3.1 inches)91%low
February Weather-6°C (21°F)78 mm (3.1 inches)89%moderate
March Weather-2°C (29°F)69 mm (2.7 inches)85%moderate
April Weather5°C (42°F)110 mm (4.3 inches)84%very high
May Weather12°C (55°F)95 mm (3.7 inches)78%very high
June Weather17°C (63°F)98 mm (3.9 inches)72%very high
July Weather20°C (69°F)106 mm (4.2 inches)75%very high
August Weather19°C (67°F)88 mm (3.5 inches)74%very high
September Weather15°C (60°F)64 mm (2.5 inches)77%high
October Weather9°C (48°F)138 mm (5.5 inches)85%moderate
November Weather0°C (33°F)103 mm (4.0 inches)86%moderate
December Weather-5°C (23°F)85 mm (3.3 inches)85%low

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