May weather forecast and climate
Williston, NY

The last month of the spring, May, is a comfortable month in Williston, New York, with average temperature fluctuating between 66.6°F (19.2°C) and 47.8°F (8.8°C).

Temperature

In May, the average high-temperature rises, from a fresh 52.7°F (11.5°C) in April, to an enjoyable 66.6°F (19.2°C). In May, in Williston, New York, the average low-temperature is 47.8°F (8.8°C).

Humidity

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 in Williston. Rain falls for 16.8 days and accumulates 2.44" (62mm) of precipitation.

Snowfall

January through May, October through December are months with snowfall. May is the last month it regularly snows in Williston. During 0.7 snowfall days, Williston aggregates 0.35" (9mm) of snow. In Williston, New York, 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 14.7h.

Sunshine

The average sunshine in May is 8.8h.

UV index

In Williston, the average daily maximum UV index is 5. A UV Index of 3 to 5 symbolizes a medium vulnerability from unprotected exposure to the Sun's UV rays for ordinary individuals.
Note: In May, the average maximum UV index of 5 translate into the following recommendations:
Take precautions. Light skin individuals may get burned in less than 30 minutes. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects. Caution! The reflection of snow can nearly double the intensity of the Sun's UV radiation.

What is the temperature in May in Williston?

The average high-temperature, in May, is 66.6°F (19.2°C), while the average low-temperature is 47.8°F (8.8°C).

What is the least humid month in Williston?

Months with the lowest humidity in Williston, New York, are May, July and August, with an average relative humidity of 77%.

What is the average humidity in May in Williston?

The average relative humidity in May in Williston, New York, is 77%.

How much does it rain in Williston in May?

In Williston, New York, in May, it is raining for 16.8 days, with typically 2.44" (62mm) of accumulated precipitation.

What is the wettest month in Williston?

May is the month with the most rainfall in Williston, New York. Rain falls for 16.8 days and accumulates 2.44" (62mm) of precipitation.

What is the last month it snows in Williston?

May is the last month it regularly snows. During 0.7 snowfall days, in May, Williston aggregates 0.35" (9mm) of snow.

What is the average length of the day in May in Williston?

The average length of the day in May in Williston, New York, is 14.7h.

How long on average sun shines in May in Williston?

In Williston, the average sunshine in May is 8.8h.

How high is the UV index in May in Williston?

The average daily maximum UV index in May in Williston, New York, is 5. A UV Index value of 3 to 5 symbolizes a moderate vulnerability from the exposure to the Sun's UV radiation.
Average temperature in May - Williston, NY
  • Average high temperature in May: 19.2°C

The warmest month (with the highest average high temperature) is July (26.2°C).
The month with the lowest average high temperature is January (-1.7°C).

  • Average low temperature in May: 8.8°C

The month with the highest average low temperature is July (16.1°C).
The coldest month (with the lowest average low temperature) is January (-7.7°C).

Average pressure in May - Williston, NY
  • Average pressure in May: 1015.5mbar

The month with the highest atmospheric pressure is November (1018.9mbar).
The month with the lowest atmospheric pressure is June (1013.4mbar).

Average wind speed in May - Williston, NY
  • Average wind speed in May: 12km/h

The windiest month (with the highest average wind speed) is January (16.6km/h).
The calmest month (with the lowest average wind speed) is July (10.3km/h).

Average humidity in May - Williston, NY
  • Average humidity in May: 77%

Months with the highest relative humidity are January and February (87%).
Months with the lowest relative humidity are May, July and August (77%).

Average rainfall in May - Williston, NY
  • Average rainfall in May: 62mm

The wettest month (with the highest rainfall) is May (62mm).
The driest month (with the least rainfall) is September (34mm).

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: 9mm

The month with the highest snowfall is February (168mm).
Months with the least snowfall are June, July, August and September (0mm).

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).
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: 14.7h

The month with the longest days is June (Average daylight: 15.3h).
The month with the shortest days is December (Average daylight: 9.1h).

  • Average sunshine in May: 8.8h

The month with the most sunshine is July (Average sunshine: 10.3h).
The month with the least sunshine is January (Average sunshine: 2.3h).

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).
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: 9km

Months with the highest visibility are April, May, June, July, August, September, October and November (9km).
Months with the lowest visibility are January, February, March and December (8km).