May Weather in Granby, United States

Last updated: June 24, 2025

In May, the average temperature in Granby, United States hovers around 4°C (39°F). Temperatures can swing dramatically, with a minimum of -13°C (8°F) and a maximum reaching up to 22°C (72°F). Expect 64 mm (2.5 in) of precipitation spread across 12 days, accompanied by an average humidity of 66%. Be prepared for variable weather as you explore!

May Temperature in Granby

In May in Granby, the average temperature is 4°C (39°F), with maximums potentially reaching 22°C (72°F) and minimums dropping as low as -13°C (8°F). Be prepared for a wide range of temperatures if you're planning to travel during this time.

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

The chart illustrates May temperature patterns in Granby, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Granby, May typically has an average temperature of 4°C (39°F), with highs reaching up to 22°C (72°F) and lows dropping to around -13°C (8°F).

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

May Precipitation in Granby

In Granby in May, the total precipitation amount is 64 mm (2.5 in) over the course of 12 days.

May Precipitation Trends in Granby

The chart displays monthly precipitation patterns in Granby, 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 Granby, May typically receives around 64 mm (2.5 inches) of precipitation spread over approximately 12 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 Granby

In Granby in May, humidity is 66%. With an average temperature of 4°C (39°F), this humidity feels like a damp chill that seeps into your bones, making outdoor activities less enjoyable and requiring warm, layered clothing to stay comfortable while traveling.

May Average Humidity in Granby

This chart illustrates the average monthly humidity levels in Granby, 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 Granby 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 Granby

In Granby in May, the maximum UV index reaches 13, which corresponds to an extreme Exposure Category. With a time to burn of just 10 minutes, it's crucial to take protective measures. For detailed information, you can check the Hourly UV Index in Granby.

Maximum UV Index Levels in Granby for May

The chart shows the monthly maximum UV Index (UVI) for Granby 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 Granby typically reaches 13, which falls under the extreme exposure category.

Data source: Granby 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 Granby Compares to Other Months

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

This table compares monthly weather conditions in Granby, showing how May’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-9°C (16°F)	38 mm (1.5 inches)	88%	moderate
February Weather	-8°C (19°F)	54 mm (2.1 inches)	87%	high
March Weather	-3°C (27°F)	58 mm (2.3 inches)	81%	very high
April Weather	0°C (32°F)	62 mm (2.4 inches)	76%	extreme
May Weather	4°C (39°F)	64 mm (2.5 inches)	66%	extreme
June Weather	11°C (52°F)	33 mm (1.3 inches)	58%	extreme
July Weather	15°C (59°F)	25 mm (1.0 inches)	52%	extreme
August Weather	14°C (58°F)	27 mm (1.1 inches)	56%	extreme
September Weather	11°C (51°F)	26 mm (1.0 inches)	65%	very high
October Weather	2°C (36°F)	50 mm (2.0 inches)	76%	high
November Weather	-4°C (24°F)	40 mm (1.6 inches)	82%	moderate
December Weather	-9°C (15°F)	41 mm (1.6 inches)	89%	moderate