January Weather in Crystal Lake, United States

Last updated: June 24, 2025

In Crystal Lake, United States, the average temperature in January hovers around -1°C (30°F), with extremes ranging from a chilly -24°C (-10°F) to a pleasant 19°C (67°F). Expect about 69 mm (2.7 in) of precipitation over 8 days, contributing to an average humidity of 84%, making this month a mix of cold and wet weather.

January Temperature in Crystal Lake

In January in Crystal Lake, the average temperature is -1°C (30°F), with a maximum that can reach 19°C (67°F) and a minimum that can drop as low as -24°C (-10°F). Travelers should be prepared for a wide range of temperatures, from chilly to surprisingly warm, making it essential to pack layers and stay versatile in their clothing choices.

January Weather in Crystal Lake: Daily Temperature Highs, Lows, and Averages

The chart illustrates January temperature patterns in Crystal Lake, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Crystal Lake, January typically has an average temperature of -1°C (30°F), with highs reaching up to 19°C (67°F) and lows dropping to around -24°C (-10°F).

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

January Precipitation in Crystal Lake

In Crystal Lake in January, the precipitation amount is 69 mm (2.7 in) that falls over a period of 8 days.

January Precipitation Trends in Crystal Lake

The chart displays monthly precipitation patterns in Crystal Lake, 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 Crystal Lake, January typically receives around 69 mm (2.7 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 Crystal Lake

In Crystal Lake in January, humidity is 84%. With an average temperature of -1°C (30°F), this humidity feels like a sharp chill that seeps into your bones, making travel uncomfortable as the wetness in the air intensifies the cold, leaving you yearning for warmth and shelter.

January Average Humidity in Crystal Lake

This chart illustrates the average monthly humidity levels in Crystal Lake, 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 Crystal Lake 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 Crystal Lake

In Crystal Lake 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 Crystal Lake, you can check the information here.

Maximum UV Index Levels in Crystal Lake for January

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

Data source: Crystal Lake 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 Crystal Lake Compares to Other Months

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

This table compares monthly weather conditions in Crystal Lake, 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 (30°F)	69 mm (2.7 inches)	84%	moderate
February Weather	0°C (32°F)	88 mm (3.5 inches)	82%	moderate
March Weather	3°C (38°F)	85 mm (3.4 inches)	81%	high
April Weather	9°C (49°F)	128 mm (5.0 inches)	78%	very high
May Weather	15°C (59°F)	110 mm (4.3 inches)	69%	very high
June Weather	20°C (69°F)	79 mm (3.1 inches)	69%	very high
July Weather	23°C (74°F)	141 mm (5.6 inches)	62%	very high
August Weather	23°C (73°F)	86 mm (3.4 inches)	65%	very high
September Weather	19°C (66°F)	101 mm (4.0 inches)	68%	very high
October Weather	13°C (56°F)	138 mm (5.4 inches)	74%	high
November Weather	5°C (42°F)	92 mm (3.6 inches)	82%	moderate
December Weather	1°C (34°F)	121 mm (4.8 inches)	80%	low