Contents
- Weather in May
- Frequently asked questions
- Average temperature in May
- Average pressure in May
- Average wind speed in May
- Average humidity in May
- Average rainfall in May
- Average rainfall days in May
- Average snowfall in May
- Average snowfall days in May
- Average daylight in May
- Average sunshine in May
- Average sunshine days in May
- Average UV index in May
- Average cloud cover in May
- Average visibility in May
Weather in May
Temperature
The shift from April to May is marked by an increase in the average high-temperature, moving from a moderate 55.6°F (13.1°C) to an enjoyable 66.7°F (19.3°C). Throughout May, an average nighttime temperature of 49.8°F (9.9°C) is experienced.Humidity
In May, the average relative humidity is 72%.Rainfall
In May, the rain falls for 4.3 days. Throughout May, 0.28" (7mm) of precipitation is accumulated. In Charlestown, Massachusetts, during the entire year, the rain falls for 47.8 days and collects up to 4.13" (105mm) of precipitation.Snowfall
Months with snowfall are January through May, November and December. May is the last month it regularly snows. During 0.1 snowfall days, in May, Charlestown aggregates 0.04" (1mm) of snow. Throughout the year, there are 13.2 snowfall days, and 2.17" (55mm) of snow is accumulated.Daylight
The average length of the day in May is 14h and 37min.On the first day of the month, sunrise is at 5:38 am and sunset at 7:44 pm. On the last day of May, sunrise is at 5:09 am and sunset at 8:14 pm EDT.
Sunshine
In May, the average sunshine is 8.4h.UV index
In May, the average daily maximum UV index in Charlestown is 5. A UV Index estimate of 3 to 5 represents a moderate health risk from exposure to the Sun's UV rays for average individuals.Note: The UV index of 5 in May translates into these instructions:
Be mindful. Those with pale skin might receive burns in fewer than 30 minutes. The intensity of the Sun's UV radiation during midday suggests reducing time spent outdoors. Your best bet for sun defense on the face, eyes, and neck is a hat with a wide brim. Remember this! The UV radiation of the Sun can be nearly doubled by the reflective properties of snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are May temperatures?
What is the average humidity in May?
How many days does it rain in May?
What is the last month it snows?
How many hours of daylight does Charlestown have in May?
When is the sunrise / sunset in May?
How many hours of sunshine does Charlestown have in May?
What is the UV index intensity in May?
Average temperature in May
Charlestown, MA
- Average high temperature in May: 66.7°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 (33.8°F).
- Average low temperature in May: 49.8°F
The month with the highest average low temperature is July (64.8°F).
The coldest month (with the lowest average low temperature) is January (22.5°F).
Average pressure in May
Charlestown, MA
- Average pressure in May: 30.01"Hg
The month with the highest atmospheric pressure is November (30.06"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).
Average wind speed in May
Charlestown, MA
- Average wind speed in May: 7.2mph
The windiest month (with the highest average wind speed) is January (9.6mph).
The calmest month (with the lowest average wind speed) is August (6mph).
Average humidity in May
Charlestown, MA
- Average humidity in May: 72%
The month with the highest relative humidity is February (78%).
The month with the lowest relative humidity is April (69%).
Average rainfall in May
Charlestown, MA
- Average rainfall in May: 0.28"
The wettest month (with the highest rainfall) is November (0.55").
The driest month (with the least rainfall) is September (0.12").
Average rainfall days in May
Charlestown, MA
- Average rainfall days in May: 4.3 days
The month with the highest number of rainy days is April (5.9 days).
The months with the least rainy days are January and September (2.9 days).
Average snowfall in May
Charlestown, MA
- Average snowfall in May: 0.04"
The month with the highest snowfall is December (0.71").
The months with the least snowfall are June, July, August, September and October (0").
Average snowfall days in May
Charlestown, MA
- Average snowfall days in May: 0.1 days
The month with the highest number of snowfall days is January (3.4 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in May /
Average sunshine in May
Charlestown, MA
- Average daylight in May: 14h and 4min
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 2min
The month with the most sunshine is August (Average sunshine: 10h and 30min).
The month with the least sunshine is February (Average sunshine: 4h and 36min).
Average sunshine days in May
Charlestown, MA
- Average sunshine days in May: 24.3 days
The month with the most sunshine days is December (25.5 days).
The month with the least sunshine days is July (22.8 days).
Average UV index in May
Charlestown, 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
Charlestown, MA
- Average cloud cover in May: 46
The month with the most cloud cover is March (Cloud cover 50).
The month with the least cloud cover is August (Cloud cover 32).
Average visibility in May
Charlestown, MA
- 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).
Charlestown, Massachusetts, USA
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