January Weather in Castalia, United States

Last updated: June 24, 2025

In January, the average temperature in Castalia, United States hovers around -1°C (30°F), with extremes swinging from a chilling -21°C (-6°F) to a mild 15°C (59°F). Expect 76 mm (3.0 in) of precipitation over about 10 days, contributing to a high average humidity of 88%. Prepare for a wintery mix of conditions!

January Temperature in Castalia

In January in Castalia, the average temperature is -1°C (30°F), with a maximum reaching 15°C (59°F) and a minimum that can drop as low as -21°C (-6°F). Travelers should be prepared for cold weather and pack accordingly, with layers to stay warm during this chilly period.

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

The chart illustrates January temperature patterns in Castalia, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Castalia, January typically has an average temperature of -1°C (30°F), with highs reaching up to 15°C (59°F) and lows dropping to around -21°C (-6°F).

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

January Precipitation in Castalia

In Castalia in January, the total precipitation amount is 76 mm (3.0 in) spread over a period of 10 days.

January Precipitation Trends in Castalia

The chart displays monthly precipitation patterns in Castalia, 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 Castalia, January typically receives around 76 mm (3.0 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 Castalia

In Castalia in January humidity is 88%. With an average temperature of -1°C (30°F), this humidity feels like a biting chill that penetrates through your layers, making travel uncomfortable as every gust of wind becomes a sharp reminder of the cold and damp air surrounding you.

January Average Humidity in Castalia

This chart illustrates the average monthly humidity levels in Castalia, 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 Castalia is approximately 88%, 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 Castalia

In Castalia 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 Castalia, you can check the information here.

Maximum UV Index Levels in Castalia for January

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

Data source: Castalia 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 Castalia Compares to Other Months

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

This table compares monthly weather conditions in Castalia, 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)	76 mm (3.0 inches)	88%	moderate
February Weather	-1°C (31°F)	83 mm (3.3 inches)	87%	moderate
March Weather	3°C (39°F)	87 mm (3.4 inches)	87%	high
April Weather	9°C (48°F)	106 mm (4.2 inches)	87%	very high
May Weather	16°C (60°F)	124 mm (4.9 inches)	81%	very high
June Weather	21°C (71°F)	108 mm (4.3 inches)	82%	very high
July Weather	24°C (76°F)	121 mm (4.8 inches)	81%	very high
August Weather	23°C (74°F)	82 mm (3.2 inches)	78%	very high
September Weather	20°C (69°F)	70 mm (2.8 inches)	78%	very high
October Weather	14°C (58°F)	99 mm (3.9 inches)	82%	high
November Weather	6°C (42°F)	98 mm (3.9 inches)	89%	moderate
December Weather	2°C (35°F)	72 mm (2.8 inches)	86%	low