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
With the onset of May, Williamstown sees a temperature rise, with the average high-temperature moving from April's cool 51.6°F (10.9°C) to a comfortable 65.1°F (18.4°C). In Williamstown, the average nighttime temperature during May is a chilly 45.1°F (7.3°C).Humidity
In Williamstown, the average relative humidity in May is 78%.Rainfall
In May, the rain falls for 17 days. Throughout May, 3.31" (84mm) of precipitation is accumulated. Throughout the year, there are 167.1 rainfall days, and 35.98" (914mm) of precipitation is accumulated.Snowfall
Months with snowfall are January through May, October through December. May is the last month it regularly snows. During 0.5 snowfall days, in May, Williamstown aggregates 0.47" (12mm) of snow. Throughout the year, there are 66.1 snowfall days, and 39.09" (993mm) of snow is accumulated.Daylight
In May, the average length of the day is 14h and 39min.On the first day of the month, sunrise is at 5:46 am and sunset at 7:53 pm. On the last day of May, sunrise is at 5:17 am and sunset at 8:23 pm EDT.
Sunshine
The average sunshine in May in Williamstown is 8.2h.UV index
The average daily maximum UV index in May is 4. A UV Index reading of 3 to 5 represents a moderate health risk from exposure to the Sun's UV rays for ordinary individuals.Note: During May, 4 as the daily maximum UV index converts into the following advice:
Guard yourself - Avoiding sunburn is suggested. The Sun is most powerful around mid-day, so it's a good practice to reduce direct exposure. During bright days, sunglasses that offer UVA and UVB defense are recommended. On your guard! Snow's reflection can almost double the intensity of the Sun's UV radiation.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the usual temperature for Williamstown in May?
What is the average humidity in May?
How much does it rain in May?
What is the last month it snows?
What is the average length of the day in May?
When are sunrise and sunset in May?
How long on average sun shines in May?
What is the UV index intensity in May?
Average temperature in May
Williamstown, MA
- Average high temperature in May: 65.1°F
The warmest month (with the highest average high temperature) is July (78.6°F).
The month with the lowest average high temperature is January (27°F).
- Average low temperature in May: 45.1°F
The month with the highest average low temperature is July (57°F).
The coldest month (with the lowest average low temperature) is January (14.7°F).
Average pressure in May
Williamstown, MA
- Average pressure in May: 30"Hg
The month with the highest atmospheric pressure is November (30.09"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).
Average wind speed in May
Williamstown, MA
- Average wind speed in May: 6.6mph
The windiest months (with the highest average wind speed) are January and February (8.8mph).
The calmest month (with the lowest average wind speed) is August (5.3mph).
Average humidity in May
Williamstown, MA
- Average humidity in May: 78%
The month with the highest relative humidity is February (86%).
The month with the lowest relative humidity is April (77%).
Average rainfall in May
Williamstown, MA
- Average rainfall in May: 3.31"
The wettest month (with the highest rainfall) is October (3.62").
The driest month (with the least rainfall) is March (2.6").
Average rainfall days in May
Williamstown, MA
- Average rainfall days in May: 17 days
The month with the highest number of rainy days is July (17.8 days).
The month with the least rainy days is February (7.8 days).
Average snowfall in May
Williamstown, MA
- Average snowfall in May: 0.47"
The month with the highest snowfall is February (10").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in May
Williamstown, MA
- Average snowfall days in May: 0.5 days
The month with the highest number of snowfall days is February (15.8 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in May /
Average sunshine in May
Williamstown, MA
- Average daylight in May: 14h and 4min
The month with the longest days is June (Average daylight: 15h and 18min).
The month with the shortest days is December (Average daylight: 9h and 6min).
- Average sunshine in May: 8h and 1min
The month with the most sunshine is July (Average sunshine: 9h and 54min).
The month with the least sunshine is February (Average sunshine: 3h and 24min).
Average sunshine days in May
Williamstown, MA
- Average sunshine days in May: 11.8 days
The month with the most sunshine days is September (14.3 days).
The month with the least sunshine days is February (9 days).
Average UV index in May
Williamstown, MA
- Average UV index in May: 4
The months with the highest UV index are June, July and August (UV index 5).
The months with the lowest UV index are February and December (UV index 1).
Average cloud cover in May
Williamstown, MA
- Average cloud cover in May: 50
The month with the most cloud cover is February (Cloud cover 64).
The months with the least cloud cover are July and August (Cloud cover 38).
Average visibility in May
Williamstown, MA
- Average visibility in May: 5mi
The months with the highest visibility are January, March, April, May, June, July, August, September, October, November and December (5mi).
The month with the lowest visibility is February (4mi).
Williamstown, Massachusetts, USA
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