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March Weather in McHenry, United States

Last updated: August 27, 2025

In McHenry, United States, the average temperature in March hovers around 3°C (38°F). However, temperatures can swing dramatically, with a minimum of -21°C (-6°F) and a maximum of 25°C (78°F). Expect about 71 mm (2.8 in) of precipitation spread over 10 days, contributing to an average humidity level of 85%. Stay prepared for a variety of weather conditions!

March Temperature in McHenry

In March in McHenry, the average temperature is 3°C (38°F). Maximums can reach 25°C (78°F) and minimums can be as low as -21°C (-6°F). Travelers should be prepared for a wide range of temperatures, ensuring they pack both warm and lighter clothing.

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

The chart illustrates March temperature patterns in McHenry, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In McHenry, March typically has an average temperature of 3°C (38°F), with highs reaching up to 25°C (78°F) and lows dropping to around -21°C (-6°F).
JanFebMarAprMayJunJulAugSepOctNovDec242638475970757267533832
Data source: Temperature data for McHenry generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

March Precipitation in McHenry

In McHenry in March, the precipitation amount is 71 mm (2.8 in) over a duration of 10 days.

March Precipitation Trends in McHenry

The chart displays monthly precipitation patterns in McHenry, 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 McHenry, March typically receives around 71 mm (2.8 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec6159711151631149191891215053
Data source: Precipitation data for March generated using information from the Copernicus Climate Change Service.
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March Humidity in McHenry

In McHenry in March, humidity is 85%. With an average temperature of 3°C (38°F), this humidity feels like a damp chill that seeps into your bones, making outdoor activities uncomfortable and travel less enjoyable as you contend with the heavy, cold air surrounding you.

March Average Humidity in McHenry

This chart illustrates the average monthly humidity levels in McHenry, 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 McHenry is approximately 85%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec85%85%85%85%78%80%78%76%79%83%88%82%
Data source: Humidity data for March generated using information from the Copernicus Climate Change Service.

March UV Index in McHenry

In McHenry in March, the maximum UV index is 6, which corresponds to a high Exposure Category. The time to burn is approximately 25 minutes. To find the hourly UV index in McHenry, you can refer to this Hourly UV Index in McHenry.

Maximum UV Index Levels in McHenry for March

The chart shows the monthly maximum UV Index (UVI) for McHenry 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 McHenry typically reaches 6, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec34689101098532
Data source: McHenry 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 McHenry Compares to Other Months

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

This table compares monthly weather conditions in McHenry, showing how March’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-4°C (24°F)61 mm (2.4 inches)85%moderate
February Weather-3°C (27°F)59 mm (2.3 inches)85%moderate
March Weather3°C (38°F)71 mm (2.8 inches)85%high
April Weather8°C (47°F)114 mm (4.5 inches)85%very high
May Weather15°C (60°F)163 mm (6.4 inches)78%very high
June Weather21°C (71°F)114 mm (4.5 inches)80%very high
July Weather24°C (75°F)91 mm (3.6 inches)78%very high
August Weather22°C (73°F)91 mm (3.6 inches)76%very high
September Weather19°C (67°F)89 mm (3.5 inches)79%very high
October Weather12°C (54°F)121 mm (4.8 inches)83%moderate
November Weather3°C (38°F)50 mm (2.0 inches)88%moderate
December Weather0°C (32°F)53 mm (2.1 inches)81%low

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