May weather forecastHarlowton, MT
May
Weather in May
May, the last month of the spring in Harlowton, is a mild month, with an average temperature varying between 39.7°F (4.3°C) and 59.4°F (15.2°C).Temperature
May's arrival coincides with a rise in the average high-temperature, moving from April's chilly 49.3°F (9.6°C) to a mild 59.4°F (15.2°C). The average temperature during May nights dips to a wintry 39.7°F (4.3°C).Humidity
The average relative humidity in May is 62%.Rainfall
May is the month with the most rainfall in Harlowton. Rain falls for 18.7 days and accumulates 2.4" (61mm) of precipitation.Snowfall
Months with snowfall are January through May, September through December. May is the last month it regularly snows. During 2.5 snowfall days, in May, Harlowton aggregates 1.18" (30mm) of snow. Throughout the year, there are 72.8 snowfall days, and 33.5" (851mm) of snow is accumulated.Daylight
In May, the average length of the day is 15h and 2min.On the first day of May in Harlowton, sunrise is at 6:03 am and sunset at 8:29 pm. On the last day of the month, sunrise is at 5:30 am and sunset at 9:03 pm MDT.
Sunshine
In Harlowton, Montana, the average sunshine in May is 10.5h.UV index
In Harlowton, the average daily maximum UV index in May is 4. A UV Index estimate of 3 to 5 represents a moderate threat to health from exposure to the Sun's UV rays for the average person.Note: In May, a daily maximum UV index of 4 leads to the following instructions:
Preventative actions are necessary - The mandate to avoid skin and eye damage is in place. Direct exposure to the Sun during its peak hours around mid-day should be minimized for safety. Sunglasses providing both UVA and UVB protection are non-negotiable on sunlit days. Take careful note! The UV radiation of the Sun can be nearly doubled by snow reflection.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in May
Harlowton, MT
- Average high temperature in May: 59.4°F
The warmest month (with the highest average high temperature) is July (80.1°F).
The month with the lowest average high temperature is December (29.3°F).
- Average low temperature in May: 39.7°F
The months with the highest average low temperature are July and August (54.3°F).
The coldest month (with the lowest average low temperature) is February (16.3°F).
Average pressure in May
Harlowton, MT
- Average pressure in May: 29.93"Hg
The months with the highest atmospheric pressure are January and December (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.87"Hg).
Average wind speed in May
Harlowton, MT
- Average wind speed in May: 7.9mph
The windiest month (with the highest average wind speed) is January (10.9mph).
The calmest months (with the lowest average wind speed) are July and August (6.8mph).
Average humidity in May
Harlowton, MT
- Average humidity in May: 62%
The month with the highest relative humidity is January (78%).
The month with the lowest relative humidity is August (45%).
Average rainfall in May
Harlowton, MT
- Average rainfall in May: 2.4"
The wettest month (with the highest rainfall) is May (2.4").
The driest month (with the least rainfall) is December (0.47").
Average rainfall days in May
Harlowton, MT
- Average rainfall days in May: 18.7 days
The month with the highest number of rainy days is May (18.7 days).
The months with the least rainy days are January and December (7.2 days).
Average snowfall in May
Harlowton, MT
- Average snowfall in May: 1.18"
The month with the highest snowfall is April (6.61").
The months with the least snowfall are June, July and August (0").
Average snowfall days in May
Harlowton, MT
- Average snowfall days in May: 2.5 days
The month with the highest number of snowfall days is February (14.2 days).
The months with the least snowfall days are June, July and August (0 days).
Average daylight in May /
Average sunshine in May
Harlowton, MT
- Average daylight in May: 15h and 0min
The month with the longest days is June (Average daylight: 15h and 48min).
The month with the shortest days is December (Average daylight: 8h and 42min).
- Average sunshine in May: 10h and 30min
The month with the most sunshine is July (Average sunshine: 11h and 48min).
The month with the least sunshine is February (Average sunshine: 6h and 24min).
Average sunshine days in May
Harlowton, MT
- Average sunshine days in May: 9.2 days
The month with the most sunshine days is September (19.2 days).
The month with the least sunshine days is April (9 days).
Average UV index in May
Harlowton, MT
- Average UV index in May: 4
The month with the highest UV index is July (UV index 6).
The months with the lowest UV index are January, February, March, November and December (UV index 2).
Average cloud cover in May
Harlowton, MT
- Average cloud cover in May: 32
The month with the most cloud cover is February (Cloud cover 38).
The month with the least cloud cover is August (Cloud cover 15).
Average visibility in May
Harlowton, MT
- Average visibility in May: 6mi
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
