May weather forecast and climate
Williamsville, NY

Weather in May

The last month of the spring, May, is an enjoyable month in Williamsville, New York, with temperature in the range of an average high of 66°F (18.9°C) and an average low of 48°F (8.9°C).

Temperature

In Williamsville, the average high-temperature rises, from a cool 52.7°F (11.5°C) in April, to an enjoyable 66°F (18.9°C). The average low-temperature, in May, is 48°F (8.9°C).

Humidity

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, in Williamsville, 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 in Williamsville, New York. During 0.3 snowfall days, in May, Williamsville aggregates 0.12" (3mm) of snow. Throughout the year, 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 14.7h.

Sunshine

In Williamsville, the average sunshine is 8.9h.

UV index

The average daily maximum UV index in May is 5. A UV Index value of 3 to 5 symbolizes a moderate health risk from the 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. Beware! The strength of the UV rays is increased nearly double-fold by the reflection of the snow.
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FAQ

What is the temperature in May in Williamsville?

In Williamsville, in May, the average high-temperature is 66°F (18.9°C), and the average low-temperature is 48°F (8.9°C).

What is the average humidity in May in Williamsville?

The average relative humidity in May in Williamsville is 76%.

How much does it rain in Williamsville in May?

In May, in Williamsville, New York, the rain falls for 14.6 days. Throughout May, 1.5" (38mm) of precipitation is accumulated.

What is the last month it snows in Williamsville?

May is the last month it regularly snows in Williamsville. During 0.3 snowfall days, in May, Williamsville aggregates 0.12" (3mm) of snow.

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

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

How long on average sun shines in May in Williamsville?

In Williamsville, New York, the average sunshine in May is 8.9h.

What is the UV index reading in May in Williamsville?

In Williamsville, the average daily maximum UV index in May is 5. A UV Index of 3 to 5 symbolizes a moderate vulnerability from the exposure to the Sun's UV rays.

Average temperature in May
Williamsville, NY

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).

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Average pressure in May
Williamsville, NY

Average pressure in May - Williamsville, NY
  • Average pressure in May: 29.99"

The month with the highest atmospheric pressure is November (30.09").
The month with the lowest atmospheric pressure is June (29.93").

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Average wind speed in May
Williamsville, NY

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).

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Average humidity in May
Williamsville, NY

Average humidity in May - Williamsville, NY
  • Average humidity in May: 76%

Months with the highest relative humidity are January and February (86%).
Months with the lowest relative humidity are July and August (75%).

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Average rainfall in May
Williamsville, NY

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").

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Average rainfall days in May
Williamsville, NY

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).

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Average snowfall in May
Williamsville, NY

Average snowfall in May - Williamsville, NY
  • Average snowfall in May: 0.12"

Months with the highest snowfall are January and February (2.95").
Months with the least snowfall are June, July, August and September (0").

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Average snowfall days in May
Williamsville, NY

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).
Months with the least snowfall days are June, July, August and September (0 days).

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Average daylight in May /
Average sunshine in May
Williamsville, NY

Average daylight in May / Average sunshine in May - Williamsville, 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: 8.9h

Months with the most sunshine are July and August (Average sunshine: 10.4h).
The month with the least sunshine is January (Average sunshine: 2.4h).

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Average sunshine days in May
Williamsville, NY

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).

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Average UV index in May
Williamsville, NY

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).
Months with the lowest UV index are January, February and December (UV index 1).

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Average cloud cover in May
Williamsville, NY

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).

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Average visibility in May
Williamsville, NY

Average visibility in May - Williamsville, NY
  • Average visibility in May: 6mi

Months with the highest visibility are April, May, June, July, August, September, October, November and December (6mi).
Months with the lowest visibility are January, February and March (5mi).

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