January Weather in Mason City, United States

Last updated: June 24, 2025

The average temperature in Mason City, United States during January hovers around -8°C (19°F). While the mercury can dip as low as -34°C (-28°F), it can also reach a maximum of 11°C (52°F). Expect 36 mm (1.4 in) of precipitation spread over 5 days, with a notable average humidity of 82%.

January Temperature in Mason City

In January in Mason City, the average temperature is -8°C (19°F), with maximums reaching 11°C (52°F) and minimums dropping as low as -34°C (-28°F). Travelers should be prepared for extreme cold, with a significant range in temperatures that may require careful planning for outdoor activities.

January Weather in Mason City: Daily Temperature Highs, Lows, and Averages

The chart illustrates January temperature patterns in Mason City, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Mason City, January typically has an average temperature of -8°C (19°F), with highs reaching up to 11°C (52°F) and lows dropping to around -34°C (-28°F).

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

January Precipitation in Mason City

In Mason City in January, the precipitation amount is 36 mm (1.4 in) over the course of 5 days.

January Precipitation Trends in Mason City

The chart displays monthly precipitation patterns in Mason City, 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 Mason City, January typically receives around 36 mm (1.4 inches) of precipitation spread over approximately 5 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 Mason City

In Mason City in January humidity is 82%. With an average temperature of -8°C (19°F), this humidity feels like a biting chill enveloping you, making it crucial to dress in layers for traveling, as the dampness in the air penetrates clothing and adds an extra layer of discomfort to the cold.

January Average Humidity in Mason City

This chart illustrates the average monthly humidity levels in Mason City, 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 Mason City is approximately 82%, 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 Mason City

In Mason City 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 Mason City, you can check the information here.

Maximum UV Index Levels in Mason City for January

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

Data source: Mason City 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 Mason City Compares to Other Months

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

This table compares monthly weather conditions in Mason City, showing how January’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-8°C (19°F)	36 mm (1.4 inches)	82%	moderate
February Weather	-8°C (18°F)	47 mm (1.9 inches)	84%	moderate
March Weather	1°C (35°F)	71 mm (2.8 inches)	80%	moderate
April Weather	7°C (45°F)	80 mm (3.1 inches)	81%	very high
May Weather	15°C (60°F)	159 mm (6.3 inches)	74%	very high
June Weather	22°C (72°F)	132 mm (5.2 inches)	80%	extreme
July Weather	23°C (74°F)	98 mm (3.8 inches)	80%	very high
August Weather	21°C (71°F)	118 mm (4.7 inches)	77%	very high
September Weather	18°C (65°F)	108 mm (4.2 inches)	75%	very high
October Weather	10°C (49°F)	112 mm (4.4 inches)	80%	moderate
November Weather	1°C (35°F)	49 mm (1.9 inches)	87%	moderate
December Weather	-3°C (27°F)	35 mm (1.4 inches)	83%	moderate