May Weather in Hartley, United States

Last updated: June 24, 2025

In Hartley, United States, the average temperature in May is a pleasant 20°C (68°F). However, be prepared for a temperature range that can dip to a chilly 4°C (40°F) or soar up to a scorching 40°C (103°F). With an average precipitation of 18 mm (0.7 in) spread over just 2 days, you might want to keep an umbrella handy. The overall atmosphere is quite humid, with an average humidity level of 74%.

May Temperature in Hartley

In May in Hartley, the average temperature is 20°C (68°F). Maximum temperatures can reach 40°C (103°F), while minimums can drop to as low as 4°C (40°F). This variety in temperature makes it essential for travelers to pack accordingly for both warm and cool conditions.

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

The chart illustrates May temperature patterns in Hartley, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Hartley, May typically has an average temperature of 20°C (68°F), with highs reaching up to 40°C (103°F) and lows dropping to around 4°C (40°F).

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

May Precipitation in Hartley

In Hartley in May, the precipitation amount is 18 mm (0.7 in) over the course of 2 days.

May Precipitation Trends in Hartley

The chart displays monthly precipitation patterns in Hartley, 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 Hartley, May typically receives around 18 mm (0.7 inches) of precipitation spread over approximately 2 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 Hartley

In Hartley in May humidity is 74%. With an average temperature of 20°C (68°F), this humidity feels like a warm, sticky embrace that can make outdoor activities feel exhausting, prompting travelers to seek shade and hydration more often.

May Average Humidity in Hartley

This chart illustrates the average monthly humidity levels in Hartley, 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 Hartley is approximately 74%, 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 Hartley

In Hartley in May, the maximum UV index reaches 10, which corresponds to a very high Exposure Category. With a time to burn of just 15 minutes, it's crucial to take precautions. For more detailed information, you can check the Hourly UV Index in Hartley.

Maximum UV Index Levels in Hartley for May

The chart shows the monthly maximum UV Index (UVI) for Hartley 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 Hartley typically reaches 10, which falls under the very high exposure category.

Data source: Hartley 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 Hartley Compares to Other Months

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

This table compares monthly weather conditions in Hartley, showing how May’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	10°C (50°F)	124 mm (4.9 inches)	84%	moderate
February Weather	12°C (54°F)	106 mm (4.2 inches)	84%	moderate
March Weather	13°C (56°F)	79 mm (3.1 inches)	83%	high
April Weather	17°C (62°F)	30 mm (1.2 inches)	81%	very high
May Weather	20°C (68°F)	18 mm (0.7 inches)	74%	very high
June Weather	24°C (75°F)	2 mm (0.1 inches)	64%	extreme
July Weather	25°C (77°F)	0 mm (0.0 inches)	44%	extreme
August Weather	24°C (76°F)	0 mm (0.0 inches)	36%	very high
September Weather	23°C (74°F)	1 mm (0.0 inches)	44%	very high
October Weather	19°C (66°F)	27 mm (1.1 inches)	65%	high
November Weather	13°C (56°F)	38 mm (1.5 inches)	84%	moderate
December Weather	10°C (50°F)	85 mm (3.3 inches)	83%	moderate