January Weather in Allen, United States

Last updated: June 24, 2025

In Allen, United States, the average temperature in January hovers around 5°C (42°F). Be prepared for a wide temperature range, with minimums dipping to -15°C (6°F) and maximums soaring to 25°C (77°F). Expect 68 mm (2.7 in) of precipitation spread over approximately 6 days, and enjoy the relatively high average humidity of 79%.

January Temperature in Allen

In January in Allen, the average temperature is 5°C (42°F). The maximum can reach 25°C (77°F) and the minimum can be as low as -15°C (6°F). This variability in temperature makes it essential for travelers to pack layers and be prepared for both warm and cold conditions.

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

The chart illustrates January temperature patterns in Allen, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Allen, January typically has an average temperature of 5°C (42°F), with highs reaching up to 25°C (77°F) and lows dropping to around -15°C (6°F).

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

January Precipitation in Allen

In Allen in January, the precipitation amount is 68 mm (2.7 in) spread over the course of 6 days.

January Precipitation Trends in Allen

The chart displays monthly precipitation patterns in Allen, 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 Allen, January typically receives around 68 mm (2.7 inches) of precipitation spread over approximately 6 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 Allen

In Allen in January, humidity is 79%. With an average temperature of 5°C (42°F), this humidity feels like a chilly mist enveloping you, making outdoor activities challenging and travel less appealing, as the dampness clings to your skin and the cold bites through your layers.

January Average Humidity in Allen

This chart illustrates the average monthly humidity levels in Allen, 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 Allen is approximately 79%, 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 Allen

In Allen in January, the maximum UV index reaches 4, which corresponds to a moderate Exposure Category. With a time to burn of 30 minutes, it’s important to take precautions to protect your skin. You can find more details in the Hourly UV Index in Allen for better planning.

Maximum UV Index Levels in Allen for January

The chart shows the monthly maximum UV Index (UVI) for Allen 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 Allen typically reaches 4, which falls under the moderate exposure category.

Data source: Allen 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 Allen Compares to Other Months

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

This table compares monthly weather conditions in Allen, showing how January’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	5°C (42°F)	68 mm (2.7 inches)	79%	moderate
February Weather	6°C (44°F)	81 mm (3.2 inches)	78%	high
March Weather	13°C (56°F)	89 mm (3.5 inches)	75%	high
April Weather	16°C (61°F)	136 mm (5.4 inches)	75%	very high
May Weather	21°C (71°F)	171 mm (6.7 inches)	83%	very high
June Weather	26°C (79°F)	77 mm (3.0 inches)	81%	extreme
July Weather	28°C (83°F)	68 mm (2.7 inches)	78%	extreme
August Weather	27°C (82°F)	70 mm (2.8 inches)	68%	extreme
September Weather	25°C (77°F)	106 mm (4.2 inches)	64%	very high
October Weather	17°C (64°F)	117 mm (4.6 inches)	71%	high
November Weather	11°C (52°F)	51 mm (2.0 inches)	82%	moderate
December Weather	8°C (47°F)	57 mm (2.2 inches)	87%	moderate