January Weather in Annandale, United States

Last updated: June 24, 2025

In January, the average temperature in Annandale, United States hovers around -9°C (15°F), but be prepared for extremes; it can dip as low as -34°C (-29°F) or rise to a mild 7°C (45°F). Expect about 21 mm (0.8 in) of precipitation over 4 days, combined with a high average humidity of 87%.

January Temperature in Annandale

In January in Annandale, the average temperature is -9°C (15°F). The maximum can reach 7°C (45°F) and the minimum can be as low as -34°C (-29°F). Travelers should be prepared for very cold weather and extreme temperature fluctuations.

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

The chart illustrates January temperature patterns in Annandale, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Annandale, January typically has an average temperature of -9°C (15°F), with highs reaching up to 7°C (45°F) and lows dropping to around -34°C (-29°F).

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

January Precipitation in Annandale

In Annandale in January, the precipitation amount is 21 mm (0.8 in) over a span of 4 days.

January Precipitation Trends in Annandale

The chart displays monthly precipitation patterns in Annandale, 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 Annandale, January typically receives around 21 mm (0.8 inches) of precipitation spread over approximately 4 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 Annandale

In Annandale in January, humidity is 87%. With an average temperature of -9°C (15°F), this humidity feels like a biting chill that cuts through layers of clothing, making travel uncomfortable and requiring extra preparation to stay warm and dry.

January Average Humidity in Annandale

This chart illustrates the average monthly humidity levels in Annandale, 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 Annandale is approximately 87%, 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 Annandale

In Annandale 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 Annandale, you can visit Hourly UV Index in Annandale.

Maximum UV Index Levels in Annandale for January

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

Data source: Annandale 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 Annandale Compares to Other Months

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

This table compares monthly weather conditions in Annandale, showing how January’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-9°C (15°F)	21 mm (0.8 inches)	87%	low
February Weather	-9°C (16°F)	27 mm (1.0 inches)	90%	moderate
March Weather	0°C (32°F)	53 mm (2.1 inches)	85%	moderate
April Weather	6°C (42°F)	83 mm (3.3 inches)	84%	high
May Weather	15°C (59°F)	105 mm (4.1 inches)	78%	very high
June Weather	22°C (71°F)	74 mm (2.9 inches)	80%	very high
July Weather	23°C (74°F)	93 mm (3.7 inches)	81%	very high
August Weather	21°C (70°F)	149 mm (5.9 inches)	81%	very high
September Weather	17°C (63°F)	113 mm (4.5 inches)	81%	high
October Weather	9°C (48°F)	103 mm (4.0 inches)	84%	moderate
November Weather	0°C (32°F)	31 mm (1.2 inches)	88%	moderate
December Weather	-6°C (22°F)	44 mm (1.7 inches)	84%	low