January Weather in Glastonbury, United States

Last updated: June 24, 2025

In Glastonbury, United States during January, the average temperature hovers around -1°C (31°F), with a minimum drop to -22°C (-7°F) and a maximum rise to 20°C (68°F). Expect about 66 mm (2.6 in) of precipitation spread over 8 days, contributing to an average humidity of 84%. Prepare for chilly conditions and potential rain if you plan to visit!

January Temperature in Glastonbury

In January in Glastonbury, the average temperature is -1°C (31°F), with maximums reaching 20°C (68°F) and minimums plummeting to -22°C (-7°F). This wide temperature range makes it essential to pack layers and be prepared for both chilly and warmer spells while traveling.

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

The chart illustrates January temperature patterns in Glastonbury, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Glastonbury, January typically has an average temperature of -1°C (31°F), with highs reaching up to 20°C (68°F) and lows dropping to around -22°C (-7°F).

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

January Precipitation in Glastonbury

In Glastonbury in January, the total precipitation amount is 66 mm (2.6 in) over the course of 8 days.

January Precipitation Trends in Glastonbury

The chart displays monthly precipitation patterns in Glastonbury, 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 Glastonbury, January typically receives around 66 mm (2.6 inches) of precipitation spread over approximately 8 days.

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

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Millimeters (mm) Inches (in)

January Humidity in Glastonbury

In Glastonbury in January humidity is 84%. With an average temperature of -1°C (31°F), this humidity feels like a biting chill that seeps through layers of clothing, making outdoor excursions brisk and invigorating, yet challenging for those unaccustomed to such damp conditions.

January Average Humidity in Glastonbury

This chart illustrates the average monthly humidity levels in Glastonbury, 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 Glastonbury is approximately 84%, 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 Glastonbury

In Glastonbury 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 Glastonbury, you can check the information here.

Maximum UV Index Levels in Glastonbury for January

The chart shows the monthly maximum UV Index (UVI) for Glastonbury 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 Glastonbury typically reaches 3, which falls under the moderate exposure category.

Data source: Glastonbury 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 Glastonbury Compares to Other Months

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

This table compares monthly weather conditions in Glastonbury, showing how January’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-1°C (31°F)	66 mm (2.6 inches)	84%	moderate
February Weather	1°C (33°F)	86 mm (3.4 inches)	82%	moderate
March Weather	4°C (39°F)	89 mm (3.5 inches)	81%	high
April Weather	9°C (49°F)	125 mm (4.9 inches)	78%	very high
May Weather	15°C (60°F)	113 mm (4.5 inches)	69%	very high
June Weather	20°C (69°F)	85 mm (3.4 inches)	69%	very high
July Weather	24°C (75°F)	144 mm (5.7 inches)	62%	very high
August Weather	23°C (74°F)	90 mm (3.5 inches)	65%	very high
September Weather	19°C (67°F)	98 mm (3.8 inches)	68%	very high
October Weather	13°C (56°F)	132 mm (5.2 inches)	74%	high
November Weather	6°C (43°F)	91 mm (3.6 inches)	82%	moderate
December Weather	1°C (34°F)	123 mm (4.9 inches)	80%	low