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
In Williston, the average high-temperature in May increases from a fresh 52.7°F (11.5°C) in April to a refreshing 66.6°F (19.2°C). Williston's May nights cool down to an average low-temperature of 47.8°F (8.8°C).Humidity
The months with the lowest humidity are May, July and August, with an average relative humidity of 77%.Rainfall
May is the month with the most rainfall. Rain falls for 16.8 days and accumulates 2.44" (62mm) of precipitation.Snowfall
January through May, October through December are months with snowfall in Williston. May is the last month it regularly snows. During 0.7 snowfall days, in May, Williston aggregates 0.35" (9mm) of snow. In Williston, during the entire year, snow falls for 78.6 days and aggregates up to 25.24" (641mm) of snow.Daylight
In May, the average length of the day is 14h and 40min.On the first day of the month, sunrise is at 6:07 am and sunset at 8:15 pm. On the last day of May, sunrise is at 5:38 am and sunset at 8:45 pm EDT.
Sunshine
In May, the average sunshine is 8.8h.UV index
The average daily maximum UV index in May is 5. A UV Index value of 3 to 5 symbolizes a moderate threat to health from exposure to the Sun's UV rays for ordinary individuals.Note: The daily high UV index of 5 during May translates into the following recommendations:
Heed the precautions - Suggestions to avoid sunburn are made. Around midday, solar radiation is most harmful; hence, exposure should be limited. Limit sun-induced ocular harm with sunglasses that feature UVA and UVB filtration. Be on the lookout! Nearly twofold UV radiation from the Sun can be reflected by snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are May temperatures?
What is the least humid month in Williston?
What is the average humidity in May?
What is the wettest month?
How much does it rain in May?
What is the last month it snows?
What is the average length of the day in May?
What time are sunrise and sunset in May in Williston?
How long on average sun shines in May?
What is the UV index intensity in May?
Average temperature in May
Williston, NY
- Average high temperature in May: 66.6°F
The warmest month (with the highest average high temperature) is July (79.2°F).
The month with the lowest average high temperature is January (28.9°F).
- Average low temperature in May: 47.8°F
The month with the highest average low temperature is July (61°F).
The coldest month (with the lowest average low temperature) is January (18.1°F).
Average pressure in May
Williston, NY
- Average pressure in May: 29.99"Hg
The month with the highest atmospheric pressure is November (30.09"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).
Average wind speed in May
Williston, NY
- Average wind speed in May: 7.5mph
The windiest month (with the highest average wind speed) is January (10.3mph).
The calmest month (with the lowest average wind speed) is July (6.4mph).
Average humidity in May
Williston, NY
- Average humidity in May: 77%
The months with the highest relative humidity are January and February (87%).
The months with the lowest relative humidity are May, July and August (77%).
Average rainfall in May
Williston, NY
- Average rainfall in May: 2.44"
The wettest month (with the highest rainfall) is May (2.44").
The driest month (with the least rainfall) is September (1.34").
Average rainfall days in May
Williston, NY
- Average rainfall days in May: 16.8 days
The month with the highest number of rainy days is July (18 days).
The month with the least rainy days is February (6.8 days).
Average snowfall in May
Williston, NY
- Average snowfall in May: 0.35"
The month with the highest snowfall is February (6.61").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in May
Williston, NY
- Average snowfall days in May: 0.7 days
The month with the highest number of snowfall days is January (19 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in May /
Average sunshine in May
Williston, NY
- 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 5min
The month with the most sunshine is July (Average sunshine: 10h and 18min).
The month with the least sunshine is January (Average sunshine: 2h and 18min).
Average sunshine days in May
Williston, NY
- Average sunshine days in May: 12.1 days
The month with the most sunshine days is June (13.4 days).
The month with the least sunshine days is February (6.7 days).
Average UV index in May
Williston, NY
- Average UV index in May: 5
The month with the highest UV index is July (UV index 6).
The months with the lowest UV index are January and December (UV index 1).
Average cloud cover in May
Williston, NY
- Average cloud cover in May: 44
The month with the most cloud cover is January (Cloud cover 78).
The month with the least cloud cover is August (Cloud cover 32).
Average visibility in May
Williston, NY
- Average visibility in May: 6mi
The months with the highest visibility are April, May, June, July, August, September, October and November (6mi).
The months with the lowest visibility are January, February, March and December (5mi).
Williston, New York, USA
Weather forecast for your location
2. Allow the app to use your location