May weather forecast
Washington, PA

Weather in May

The last month of the spring, May, is a pleasant month in Washington, Pennsylvania, with average temperature ranging between min 51.4°F (10.8°C) and max 72.1°F (22.3°C).

Temperature

In May, the average high-temperature increases, from a comfortable 61.3°F (16.3°C) in April, to an agreeable 72.1°F (22.3°C). In Washington, the average low-temperature is 51.4°F (10.8°C).

Humidity

In Washington, the average relative humidity is 79%.

Rainfall

In Washington, Pennsylvania, during May, the rain falls for 17.2 days and regularly aggregates up to 1.61" (41mm) of precipitation. In Washington, Pennsylvania, during the entire year, the rain falls for 143 days and collects up to 14.8" (376mm) of precipitation.

Snowfall

Months with snowfall in Washington, Pennsylvania, are January through May, October through December. May is the last month it regularly snows. During 0.2 snowfall days, in May, Washington aggregates 0.04" (1mm) of snow. Throughout the year, there are 33.5 snowfall days, and 4.88" (124mm) of snow is accumulated.

Daylight

In May, the average length of the day in Washington, Pennsylvania, is 14.4h.

Sunshine

The average sunshine in Washington is 8.8h.

UV index

In May, the average daily maximum UV index is 5. A UV Index reading of 3 to 5 represents a moderate health risk from the exposure to the Sun's UV radiation for the average person.
Note: The average daily UV index of 5 in May transform into the following instructions:
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. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes. 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 average humidity in May in Washington?

In May, the average relative humidity in Washington is 79%.

How much does it rain in Washington in May?

In Washington, in May, during 17.2 rainfall days, 1.61" (41mm) of precipitation is typically accumulated.

What is the last month it snows in Washington?

May is the last month it regularly snows in Washington. During 0.2 snowfall days, in May, Washington aggregates 0.04" (1mm) of snow.

How many hours of daylight does Washington have in May?

In May, the average length of the day in Washington is 14.4h.

How long on average sun shines in May in Washington?

In Washington, Pennsylvania, the average sunshine in May is 8.8h.

What is the UV index intensity in May in Washington?

In Washington, the average daily maximum UV index in May is 5. A UV Index value of 3 to 5 symbolizes a moderate health threat from unsafe exposure to the Sun's UV rays.

Average temperature in May
Washington, PA

Average temperature in May - Washington, PA
  • Average high temperature in May: 22.3°C

The warmest month (with the highest average high temperature) is July (28.5°C).
The month with the lowest average high temperature is January (0.9°C).

  • Average low temperature in May: 10.8°C

The month with the highest average low temperature is July (16.6°C).
The coldest month (with the lowest average low temperature) is January (-6.2°C).

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Average pressure in May
Washington, PA

Average pressure in May - Washington, PA
  • Average pressure in May: 1015.8mbar

The month with the highest atmospheric pressure is November (1020.5mbar).
The month with the lowest atmospheric pressure is June (1014.2mbar).

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Average wind speed in May
Washington, PA

Average wind speed in May - Washington, PA
  • Average wind speed in May: 9.6km/h

The windiest month (with the highest average wind speed) is January (12.5km/h).
The calmest month (with the lowest average wind speed) is August (7.3km/h).

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Average humidity in May
Washington, PA

Average humidity in May - Washington, PA
  • Average humidity in May: 79%

The month with the highest relative humidity is February (85%).
The months with the lowest relative humidity are April, July and August (77%).

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Average rainfall in May
Washington, PA

Average rainfall in May - Washington, PA
  • Average rainfall in May: 41mm

The wettest month (with the highest rainfall) is July (42mm).
The driest months (with the least rainfall) are January and November (24mm).

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Average rainfall days in May
Washington, PA

Average rainfall days in May - Washington, PA
  • Average rainfall days in May: 17.2 days

The month with the highest number of rainy days is May (17.2 days).
The month with the least rainy days is February (7.3 days).

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Average snowfall in May
Washington, PA

Average snowfall in May - Washington, PA
  • Average snowfall in May: 1mm

The month with the highest snowfall is February (32mm).
The months with the least snowfall are June, July, August and September (0mm).

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Average snowfall days in May
Washington, PA

Average snowfall days in May - Washington, PA
  • Average snowfall days in May: 0.2 days

The month with the highest number of snowfall days is January (9.8 days).
The 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
Washington, PA

Average daylight in May / Average sunshine in May - Washington, PA
  • Average daylight in May: 14.4h

The month with the longest days is June (Average daylight: 15h).
The month with the shortest days is December (Average daylight: 9.4h).

  • Average sunshine in May: 8.8h

The month with the most sunshine is August (Average sunshine: 10.2h).
The month with the least sunshine is January (Average sunshine: 3h).

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Average sunshine days in May
Washington, PA

Average sunshine days in May - Washington, PA
  • Average sunshine days in May: 11.8 days

The month with the most sunshine days is November (19.1 days).
The month with the least sunshine days is May (11.8 days).

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Average UV index in May
Washington, PA

Average UV index in May - Washington, PA
  • Average UV index in May: 5

The months with the highest UV index are June, July and August (UV index 6).
The month with the lowest UV index is December (UV index 1).

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Average cloud cover in May
Washington, PA

Average cloud cover in May - Washington, PA
  • Average cloud cover in May: 45

The month with the most cloud cover is January (Cloud cover 68).
The month with the least cloud cover is August (Cloud cover 33).

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Average visibility in May
Washington, PA

Average visibility in May - Washington, PA
  • Average visibility in May: 8km

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

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