January Weather in Guernsey, United States

Last updated: June 24, 2025

In January, the average temperature in Guernsey, United States hovers around -1°C (31°F), but be prepared for extremes—minimums can plunge to -28°C (-19°F) while maxima reach up to 17°C (63°F). During this time, expect 12 mm (0.5 in) of precipitation spread over approximately 3 days, and a relatively high average humidity of 73%. Stay warm and dry!

January Temperature in Guernsey

In January in Guernsey, the average temperature is -1°C (31°F). The maximum can reach 17°C (63°F), while the minimum can dip as low as -28°C (-19°F). Be prepared for a wide range of temperatures if you're planning to travel during this month.

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

The chart illustrates January temperature patterns in Guernsey, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Guernsey, January typically has an average temperature of -1°C (31°F), with highs reaching up to 17°C (63°F) and lows dropping to around -28°C (-19°F).

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

January Precipitation in Guernsey

In Guernsey in January, the precipitation amount is 12 mm (0.5 in) during a span of 3 days.

January Precipitation Trends in Guernsey

The chart displays monthly precipitation patterns in Guernsey, 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 Guernsey, January typically receives around 12 mm (0.5 inches) of precipitation spread over approximately 3 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 Guernsey

In Guernsey in January, humidity is 73%. With an average temperature of -1°C (31°F), this humidity feels like a chilling embrace, making travel quite uncomfortable as it seeps into your clothes and skin, leaving you shivering and longing for warmth.

January Average Humidity in Guernsey

This chart illustrates the average monthly humidity levels in Guernsey, 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 Guernsey is approximately 73%, 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 Guernsey

In Guernsey 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 Guernsey, you can check the information here.

Maximum UV Index Levels in Guernsey for January

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

Data source: Guernsey 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 Guernsey Compares to Other Months

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

This table compares monthly weather conditions in Guernsey, 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)	12 mm (0.5 inches)	73%	moderate
February Weather	-2°C (29°F)	23 mm (0.9 inches)	78%	moderate
March Weather	4°C (39°F)	50 mm (2.0 inches)	64%	high
April Weather	8°C (46°F)	45 mm (1.8 inches)	66%	very high
May Weather	13°C (55°F)	85 mm (3.3 inches)	74%	very high
June Weather	21°C (70°F)	37 mm (1.5 inches)	84%	extreme
July Weather	25°C (77°F)	27 mm (1.1 inches)	85%	extreme
August Weather	23°C (74°F)	16 mm (0.6 inches)	85%	very high
September Weather	19°C (66°F)	24 mm (0.9 inches)	76%	very high
October Weather	8°C (47°F)	33 mm (1.3 inches)	71%	high
November Weather	4°C (40°F)	17 mm (0.7 inches)	73%	moderate
December Weather	1°C (33°F)	17 mm (0.7 inches)	75%	moderate