January Weather in Londonderry, United States

Last updated: June 24, 2025

In January, the average temperature in Londonderry, United States hovers around -6°C (21°F). However, be prepared for extreme fluctuations, as temperatures can dip as low as -30°C (-22°F) and climb to a balmy 15°C (60°F). Expect about 78 mm (3.1 in) of precipitation spread over 10 days, with an average humidity level of 89%, creating a chilly and damp atmosphere.

January Temperature in Londonderry

In January in Londonderry, the average temperature is -6°C (21°F). The maximum can reach 15°C (60°F), while the minimum can drop as low as -30°C (-22°F). Travelers should be prepared for a wide range of temperatures and pack accordingly to enjoy their visit.

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

The chart illustrates January temperature patterns in Londonderry, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Londonderry, January typically has an average temperature of -6°C (21°F), with highs reaching up to 15°C (60°F) and lows dropping to around -30°C (-22°F).

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

January Precipitation in Londonderry

In Londonderry in January, the precipitation amount is 78 mm (3.1 in) over the course of 10 days.

January Precipitation Trends in Londonderry

The chart displays monthly precipitation patterns in Londonderry, 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 Londonderry, January typically receives around 78 mm (3.1 inches) of precipitation spread over approximately 10 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 Londonderry

In Londonderry in January, humidity is 89%. With an average temperature of -6°C (21°F), this humidity feels like an uncomfortable chill that seeps into your bones, making traveling outdoors an arduous task as the cold air mixes with dampness, often leaving you feeling cold and clammy despite layers of clothing.

January Average Humidity in Londonderry

This chart illustrates the average monthly humidity levels in Londonderry, 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 Londonderry is approximately 89%, 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 Londonderry

In Londonderry 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 Londonderry, you can check the information here.

Maximum UV Index Levels in Londonderry for January

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

Data source: Londonderry 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 Londonderry Compares to Other Months

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

This table compares monthly weather conditions in Londonderry, showing how January’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-6°C (21°F)	78 mm (3.1 inches)	89%	moderate
February Weather	-5°C (24°F)	91 mm (3.6 inches)	88%	moderate
March Weather	-1°C (31°F)	78 mm (3.1 inches)	86%	high
April Weather	6°C (43°F)	131 mm (5.2 inches)	84%	very high
May Weather	13°C (55°F)	103 mm (4.0 inches)	76%	very high
June Weather	18°C (64°F)	114 mm (4.5 inches)	72%	very high
July Weather	21°C (69°F)	163 mm (6.4 inches)	66%	very high
August Weather	20°C (67°F)	120 mm (4.7 inches)	64%	very high
September Weather	16°C (61°F)	95 mm (3.7 inches)	72%	high
October Weather	9°C (49°F)	157 mm (6.2 inches)	81%	high
November Weather	1°C (35°F)	107 mm (4.2 inches)	87%	moderate
December Weather	-4°C (26°F)	105 mm (4.1 inches)	84%	low