March Weather in Alton, United States

Last updated: June 24, 2025

In Alton, United States, the average temperature in March hovers around 2°C (36°F), with a possible minimum of -25°C (-12°F) and a maximum of 24°C (76°F). Expect about 72 mm (2.8 in) of precipitation over 8 days, while the average humidity levels reach a comfortable 75%. Stay prepared for a chilly yet potentially bright month!

March Temperature in Alton

In March in Alton, the average temperature is 2°C (36°F). The maximum can reach 24°C (76°F), while the minimum can drop as low as -25°C (-12°F). Travelers should be prepared for a wide range of temperatures and pack accordingly.

March Weather in Alton: Daily Temperature Highs, Lows, and Averages

The chart illustrates March temperature patterns in Alton, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Alton, March typically has an average temperature of 2°C (36°F), with highs reaching up to 24°C (76°F) and lows dropping to around -25°C (-12°F).

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

March Precipitation in Alton

In Alton in March, the precipitation amount is 72 mm (2.8 in) over the course of 8 days.

March Precipitation Trends in Alton

The chart displays monthly precipitation patterns in Alton, with values for each month alongside March’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how March’s conditions compare to those of other months. In Alton, March typically receives around 72 mm (2.8 inches) of precipitation spread over approximately 8 days.

Data source: Precipitation data for March generated using information from the Copernicus Climate Change Service.

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Millimeters (mm) Inches (in)

March Humidity in Alton

In Alton in March, humidity is 75%. With an average temperature of 2°C (36°F), this humidity feels like a crisp chill that penetrates through layers of clothing, making outdoor exploration invigorating yet a bit uncomfortable for travelers who may not be prepared for such damp conditions.

March Average Humidity in Alton

This chart illustrates the average monthly humidity levels in Alton, with March’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In March, average humidity in Alton is approximately 75%, offering insight into how humid the weather typically is during this month.

Data source: Humidity data for March generated using information from the Copernicus Climate Change Service.

March UV Index in Alton

In Alton in March, the maximum UV index reaches 5, which corresponds to a moderate Exposure Category. Under these conditions, the estimated time to burn is approximately 30 minutes. For more details, you can check the Hourly UV Index in Alton.

Maximum UV Index Levels in Alton for March

The chart shows the monthly maximum UV Index (UVI) for Alton in March, 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 March, the maximum UV index in Alton typically reaches 5, which falls under the moderate exposure category.

Data source: Alton March 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 March Weather in Alton Compares to Other Months

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

This table compares monthly weather conditions in Alton, showing how March’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-6°C (21°F)	26 mm (1.0 inches)	80%	low
February Weather	-6°C (21°F)	32 mm (1.3 inches)	84%	moderate
March Weather	2°C (36°F)	72 mm (2.8 inches)	75%	moderate
April Weather	8°C (46°F)	95 mm (3.7 inches)	79%	very high
May Weather	15°C (60°F)	140 mm (5.5 inches)	74%	very high
June Weather	23°C (73°F)	114 mm (4.5 inches)	81%	extreme
July Weather	24°C (76°F)	72 mm (2.8 inches)	82%	very high
August Weather	22°C (72°F)	100 mm (3.9 inches)	80%	very high
September Weather	19°C (66°F)	101 mm (4.0 inches)	75%	very high
October Weather	9°C (49°F)	82 mm (3.2 inches)	77%	moderate
November Weather	2°C (36°F)	28 mm (1.1 inches)	85%	moderate
December Weather	-3°C (27°F)	39 mm (1.5 inches)	83%	moderate