May weather forecastWilliamsville, NY
May
Weather in May
The last month of the spring, May, is a comfortable month in Williamsville, New York, with an average temperature fluctuating between 48°F (8.9°C) and 66°F (18.9°C).Temperature
Williamsville in May sees a temperature change, with average high-temperatures moving from a cool 52.7°F (11.5°C) in April to an enjoyable 66°F (18.9°C). An average nighttime temperature of 48°F (8.9°C) is noted during the month of May.Humidity
In Williamsville, New York, the average relative humidity in May is 76%.Rainfall
In Williamsville, during May, the rain falls for 14.6 days and regularly aggregates up to 1.5" (38mm) of precipitation. Throughout the year, there are 139.2 rainfall days, and 14.84" (377mm) of precipitation is accumulated.Snowfall
Months with snowfall in Williamsville are January through May, October through December. May is the last month it regularly snows. During 0.3 snowfall days, in May, Williamsville aggregates 0.12" (3mm) of snow. Throughout the year, in Williamsville, New York, there are 62.1 snowfall days, and 12.68" (322mm) of snow is accumulated.Daylight
In May, the average length of the day in Williamsville is 14h and 40min.On the first day of the month, sunrise is at 6:07 am and sunset at 8:16 pm. On the last day of May, in Williamsville, sunrise is at 5:38 am and sunset at 8:46 pm EDT.
Sunshine
The average sunshine in May in Williamsville is 8.9h.UV index
In May, the average daily maximum UV index is 5. A UV Index reading of 3 to 5 represents a moderate threat to health from unprotected exposure to Sun's UV rays for average individuals.Note: The maximum UV index of 5 during May translates into these guidelines:
Preventative actions are necessary - Recommendations to ward off sunburn are given. During midday, the Sun's radiation is strongest, and it's advisable to reduce direct exposure. On days when the sun blazes, arm yourself with sunglasses that block UVA and UVB radiation. Watch out! The Sun's UV radiation can be nearly magnified twofold due to snow reflection.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in May
Williamsville, NY
- Average high temperature in May: 66°F
The warmest month (with the highest average high temperature) is July (79.3°F).
The month with the lowest average high temperature is January (29.3°F).
- Average low temperature in May: 48°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 (18.7°F).
Average pressure in May
Williamsville, 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
Williamsville, NY
- Average wind speed in May: 7.5mph
The windiest month (with the highest average wind speed) is January (10.7mph).
The calmest month (with the lowest average wind speed) is July (6.5mph).
Average humidity in May
Williamsville, NY
- Average humidity in May: 76%
The months with the highest relative humidity are January and February (86%).
The months with the lowest relative humidity are July and August (75%).
Average rainfall in May
Williamsville, NY
- Average rainfall in May: 1.5"
The wettest month (with the highest rainfall) is July (1.61").
The driest month (with the least rainfall) is September (0.91").
Average rainfall days in May
Williamsville, NY
- Average rainfall days in May: 14.6 days
The month with the highest number of rainy days is July (15.8 days).
The month with the least rainy days is February (6.4 days).
Average snowfall in May
Williamsville, NY
- Average snowfall in May: 0.12"
The months with the highest snowfall are January and February (2.95").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in May
Williamsville, NY
- Average snowfall days in May: 0.3 days
The month with the highest number of snowfall days is January (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
Williamsville, NY
- Average daylight in May: 14h and 42min
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 54min
The months with the most sunshine are July and August (Average sunshine: 10h and 24min).
The month with the least sunshine is January (Average sunshine: 2h and 24min).
Average sunshine days in May
Williamsville, NY
- Average sunshine days in May: 13.7 days
The month with the most sunshine days is September (15.5 days).
The month with the least sunshine days is February (10.2 days).
Average UV index in May
Williamsville, 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, February and December (UV index 1).
Average cloud cover in May
Williamsville, NY
- Average cloud cover in May: 42
The month with the most cloud cover is January (Cloud cover 77).
The month with the least cloud cover is August (Cloud cover 29).
Average visibility in May
Williamsville, NY
- Average visibility in May: 6mi
The months with the highest visibility are April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February and March (5mi).
