May Weather in Frederick, United States

Last updated: June 24, 2025

In May, the average temperature in Frederick, United States hovers around 13°C (56°F). Expect a wide range of temperatures, with a minimum dipping to -6°C (21°F) and reaching a maximum of 31°C (89°F). Be prepared for some rain as 109 mm (4.3 in) of precipitation can be expected over 14 days, and maintain a comfortable average humidity of 66% throughout the month.

May Temperature in Frederick

In May in Frederick, the average temperature is 13°C (56°F), with maximums reaching 31°C (89°F) and minimums dipping as low as -6°C (21°F). Travelers should be prepared for a wide range of temperatures, so layering clothing is advisable.

May Weather in Frederick: Daily Temperature Highs, Lows, and Averages

The chart illustrates May temperature patterns in Frederick, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Frederick, May typically has an average temperature of 13°C (56°F), with highs reaching up to 31°C (89°F) and lows dropping to around -6°C (21°F).

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

May Precipitation in Frederick

In Frederick in May, the precipitation amount is 109 mm (4.3 in) over the course of 14 days.

May Precipitation Trends in Frederick

The chart displays monthly precipitation patterns in Frederick, with values for each month alongside May’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how May’s conditions compare to those of other months. In Frederick, May typically receives around 109 mm (4.3 inches) of precipitation spread over approximately 14 days.

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

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Millimeters (mm) Inches (in)

May Humidity in Frederick

In Frederick in May, humidity is 66%. With an average temperature of 13°C (56°F), this humidity feels like a refreshing embrace, making travel comfortable yet occasionally brisk, inviting you to explore while ensuring you stay hydrated and take breaks from time to time.

May Average Humidity in Frederick

This chart illustrates the average monthly humidity levels in Frederick, with May’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In May, average humidity in Frederick is approximately 66%, offering insight into how humid the weather typically is during this month.

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

May UV Index in Frederick

In Frederick in May, the maximum UV index reaches 11, which corresponds to an extreme Exposure Category. With a time to burn of just 10 minutes, it's essential to take precautions. For more details, you can check the Hourly UV Index in Frederick.

Maximum UV Index Levels in Frederick for May

The chart shows the monthly maximum UV Index (UVI) for Frederick in May, 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 May, the maximum UV index in Frederick typically reaches 11, which falls under the extreme exposure category.

Data source: Frederick May 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 May Weather in Frederick Compares to Other Months

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

This table compares monthly weather conditions in Frederick, showing how May’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-1°C (30°F)	21 mm (0.8 inches)	88%	moderate
February Weather	-2°C (30°F)	27 mm (1.1 inches)	87%	high
March Weather	4°C (40°F)	55 mm (2.2 inches)	81%	very high
April Weather	9°C (48°F)	56 mm (2.2 inches)	76%	extreme
May Weather	13°C (56°F)	109 mm (4.3 inches)	66%	extreme
June Weather	20°C (69°F)	46 mm (1.8 inches)	58%	extreme
July Weather	23°C (74°F)	35 mm (1.4 inches)	52%	extreme
August Weather	22°C (73°F)	41 mm (1.6 inches)	56%	extreme
September Weather	19°C (66°F)	28 mm (1.1 inches)	65%	very high
October Weather	9°C (49°F)	37 mm (1.5 inches)	76%	high
November Weather	5°C (40°F)	24 mm (0.9 inches)	82%	moderate
December Weather	0°C (33°F)	14 mm (0.6 inches)	89%	moderate