May weather forecastBolton, MA
May
Weather in May
May, the last month of the spring in Bolton, is a comfortable month, with an average temperature fluctuating between 67.5°F (19.7°C) and 47.8°F (8.8°C).Temperature
With the onset of May, Bolton's average high-temperature sees a rise, moving from April's refreshing 55.6°F (13.1°C) to an enjoyable 67.5°F (19.7°C). During May, Bolton records a consistent average nighttime temperature of 47.8°F (8.8°C).Humidity
The average relative humidity in May is 74%.Rainfall
In Bolton, during May, the rain falls for 15.8 days and regularly aggregates up to 2.2" (56mm) of precipitation. Throughout the year, there are 150.4 rainfall days, and 28.86" (733mm) of precipitation is accumulated.Snowfall
January through May, October through December are months with snowfall in Bolton, Massachusetts. May is the last month it regularly snows. During 0.1 snowfall days, in May, Bolton aggregates 0.12" (3mm) of snow. Throughout the year, there are 36.5 snowfall days, and 23.82" (605mm) of snow is accumulated.Daylight
In May, the average length of the day is 14h and 37min.On the first day of May, sunrise is at 5:40 am and sunset at 7:46 pm. On the last day of the month, sunrise is at 5:11 am and sunset at 8:16 pm EDT.
Sunshine
In Bolton, the average sunshine in May is 8.3h.UV index
In Bolton, the average daily maximum UV index in May is 5. A UV Index reading of 3 to 5 represents a medium vulnerability from unsafe exposure to UV radiation for the average person.Note: In May, a regular UV index of 5 translates into these guidelines:
Take precautions - Protection against skin and eye damage is obliged. The Sun's most harmful UV rays are emitted around midday; avoid staying outdoors for long during this time. To mitigate harm from sun exposure, pick sunglasses offering UVA and UVB defense. Keep in mind! Snow's reflective quality can nearly double the intensity of the Sun's UV radiation.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in May
Bolton, MA
- Average high temperature in May: 67.5°F
The warmest month (with the highest average high temperature) is July (81.9°F).
The month with the lowest average high temperature is January (31.5°F).
- Average low temperature in May: 47.8°F
The month with the highest average low temperature is July (62.2°F).
The coldest month (with the lowest average low temperature) is January (19.8°F).
Average pressure in May
Bolton, MA
- Average pressure in May: 30.01"Hg
The month with the highest atmospheric pressure is November (30.07"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).
Average wind speed in May
Bolton, MA
- Average wind speed in May: 6.7mph
The windiest month (with the highest average wind speed) is January (8.6mph).
The calmest month (with the lowest average wind speed) is August (5.5mph).
Average humidity in May
Bolton, MA
- Average humidity in May: 74%
The month with the highest relative humidity is February (81%).
The month with the lowest relative humidity is April (71%).
Average rainfall in May
Bolton, MA
- Average rainfall in May: 2.2"
The wettest month (with the highest rainfall) is December (2.91").
The driest month (with the least rainfall) is September (1.57").
Average rainfall days in May
Bolton, MA
- Average rainfall days in May: 15.8 days
The month with the highest number of rainy days is July (16 days).
The month with the least rainy days is February (7.3 days).
Average snowfall in May
Bolton, MA
- Average snowfall in May: 0.12"
The month with the highest snowfall is February (6.1").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in May
Bolton, MA
- Average snowfall days in May: 0.1 days
The month with the highest number of snowfall days is February (9.4 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in May /
Average sunshine in May
Bolton, MA
- Average daylight in May: 14h and 36min
The month with the longest days is June (Average daylight: 15h and 12min).
The month with the shortest days is December (Average daylight: 9h and 6min).
- Average sunshine in May: 8h and 18min
The month with the most sunshine is August (Average sunshine: 10h and 12min).
The month with the least sunshine is February (Average sunshine: 4h and 36min).
Average sunshine days in May
Bolton, MA
- Average sunshine days in May: 13.8 days
The month with the most sunshine days is November (17.4 days).
The month with the least sunshine days is July (12.8 days).
Average UV index in May
Bolton, MA
- Average UV index in May: 5
The months with the highest UV index are June, July and August (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
Bolton, MA
- Average cloud cover in May: 47
The month with the most cloud cover is March (Cloud cover 50).
The month with the least cloud cover is August (Cloud cover 34).
Average visibility in May
Bolton, MA
- Average visibility in May: 5mi
The months with the highest visibility are March, April, October, November and December (6mi).
The months with the lowest visibility are January, February, May, June, July, August and September (5mi).
