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
May brings a temperature change, with average high-temperatures moving from April's moderate 55.9°F (13.3°C) to an enjoyable 67.1°F (19.5°C). Wellesley records an average low-temperature of 49.1°F (9.5°C) throughout the month of May.Humidity
The average relative humidity in May is 73%.Rainfall
In Wellesley, in May, it is raining for 14.7 days, with typically 1.85" (47mm) of accumulated precipitation. Throughout the year, there are 141.8 rainfall days, and 24.21" (615mm) of precipitation is accumulated.Snowfall
January through May, October through December are months with snowfall in Wellesley. May is the last month it regularly snows. During 0.1 snowfall days, in May, Wellesley aggregates 0.08" (2mm) of snow. Throughout the year, there are 28.5 snowfall days, and 15.91" (404mm) of snow is accumulated.Daylight
In May, the average length of the day in Wellesley is 14h and 37min.On the first day of May in Wellesley, sunrise is at 5:39 am and sunset at 7:45 pm. On the last day of the month, sunrise is at 5:11 am and sunset at 8:14 pm EDT.
Sunshine
The average sunshine in May is 8.6h.UV index
The average daily maximum UV index in May in Wellesley is 5. A UV Index of 3 to 5 symbolizes a moderate health risk from exposure to the Sun's UV rays for the ordinary person.Note: In May, the maximum UV index of 5 suggests these recommendations:
Be careful. Light complexion individuals might get burns in fewer than 30 minutes. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. On days when the sun blazes, arm yourself with sunglasses that block UVA and UVB radiation. Consider this! The reflection from snow can almost double the intensity of the Sun's UV radiation.
Frequently asked questions
What are the temperatures in Wellesley in May?
What is the average humidity in May in Wellesley?
How many days does it rain in May in Wellesley?
What is the last month it snows in Wellesley?
What is the average length of the day in May in Wellesley?
When are sunrise and sunset in May in Wellesley?
How many hours of sunshine does Wellesley have in May?
What is the UV index reading in May in Wellesley?
Average temperature in May
Wellesley, MA
- Average high temperature in May: 67.1°F
The warmest month (with the highest average high temperature) is July (82.4°F).
The month with the lowest average high temperature is January (33.1°F).
- Average low temperature in May: 49.1°F
The month with the highest average low temperature is July (63.5°F).
The coldest month (with the lowest average low temperature) is January (21.2°F).
Average pressure in May
Wellesley, 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
Wellesley, MA
- Average wind speed in May: 6.9mph
The windiest month (with the highest average wind speed) is January (8.8mph).
The calmest month (with the lowest average wind speed) is August (5.7mph).
Average humidity in May
Wellesley, MA
- Average humidity in May: 73%
The month with the highest relative humidity is February (79%).
The month with the lowest relative humidity is April (70%).
Average rainfall in May
Wellesley, MA
- Average rainfall in May: 1.85"
The wettest month (with the highest rainfall) is March (2.4").
The driest month (with the least rainfall) is September (1.18").
Average rainfall days in May
Wellesley, MA
- Average rainfall days in May: 14.7 days
The month with the highest number of rainy days is July (15.6 days).
The month with the least rainy days is January (7.3 days).
Average snowfall in May
Wellesley, MA
- Average snowfall in May: 0.08"
The month with the highest snowfall is February (4.17").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in May
Wellesley, MA
- Average snowfall days in May: 0.1 days
The month with the highest number of snowfall days is January (7.2 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in May /
Average sunshine in May
Wellesley, 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 4min
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 48min).
Average sunshine days in May
Wellesley, MA
- Average sunshine days in May: 14.4 days
The month with the most sunshine days is November (18.5 days).
The month with the least sunshine days is April (13.2 days).
Average UV index in May
Wellesley, 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
Wellesley, MA
- Average cloud cover in May: 46
The month with the most cloud cover is March (Cloud cover 49).
The month with the least cloud cover is August (Cloud cover 32).
Average visibility in May
Wellesley, MA
- Average visibility in May: 6mi
The months with the highest visibility are January, March, April, May, June, July, August, September, October, November and December (6mi).
The month with the lowest visibility is February (5mi).
Wellesley, Massachusetts, USA
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