January Weather in Saint Johnsbury, United States

Last updated: June 24, 2025

In January, the average temperature in Saint 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 Saint Johnsbury

In January in Saint 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 Saint Johnsbury: Daily Temperature Highs, Lows, and Averages

The chart illustrates January temperature patterns in Saint Johnsbury, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Saint 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).

Data source: Temperature data for Saint Johnsbury generated using information from the Copernicus Climate Change Service.

January Precipitation in Saint Johnsbury

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

January Precipitation Trends in Saint Johnsbury

The chart displays monthly precipitation patterns in Saint 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 Saint Johnsbury, January typically receives around 80 mm (3.1 inches) of precipitation spread over approximately 12 days.

Data source: Precipitation data for January generated using information from the Copernicus Climate Change Service.

Choose your preferred precipitation unit

Millimeters (mm) Inches (in)

January Humidity in Saint Johnsbury

In Saint 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 Saint Johnsbury

This chart illustrates the average monthly humidity levels in Saint 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 Saint Johnsbury is approximately 91%, offering insight into how humid the weather typically is during this month.

Data source: Humidity data for January generated using information from the Copernicus Climate Change Service.

January UV Index in Saint Johnsbury

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

Maximum UV Index Levels in Saint Johnsbury for January

The chart shows the monthly maximum UV Index (UVI) for Saint 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 Saint Johnsbury typically reaches 2, which falls under the low exposure category.

Data source: Saint 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 Saint Johnsbury Compares to Other Months

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

This table compares monthly weather conditions in Saint Johnsbury, showing how January’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
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 Weather	5°C (42°F)	110 mm (4.3 inches)	84%	very high
May Weather	12°C (55°F)	95 mm (3.7 inches)	78%	very high
June Weather	17°C (63°F)	98 mm (3.9 inches)	72%	very high
July Weather	20°C (69°F)	106 mm (4.2 inches)	75%	very high
August Weather	19°C (67°F)	88 mm (3.5 inches)	74%	very high
September Weather	15°C (60°F)	64 mm (2.5 inches)	77%	high
October Weather	9°C (48°F)	138 mm (5.5 inches)	85%	moderate
November Weather	0°C (33°F)	103 mm (4.0 inches)	86%	moderate
December Weather	-5°C (23°F)	85 mm (3.3 inches)	85%	low