May weather forecast
Saint Marys, PA

Weather in May

The last month of the spring, May, is a comfortable month in Saint Marys, Pennsylvania, with average temperature fluctuating between 66.9°F (19.4°C) and 46.8°F (8.2°C).

Temperature

In Saint Marys, the average high-temperature in May increases, from a fresh 54.3°F (12.4°C) in April, to an enjoyable 66.9°F (19.4°C). In Saint Marys, Pennsylvania,, the average low-temperature is 46.8°F (8.2°C).

Humidity

The average relative humidity in May is 79%.

Rainfall

In Saint Marys, it is raining for 15.7 days, with typically 1.42" (36mm) of accumulated precipitation. In Saint Marys, during the entire year, the rain falls for 118.9 days and collects up to 13.31" (338mm) of precipitation.

Snowfall

January through May, October through December are months with snowfall. May is the last month it regularly snows. During 0.5 snowfall days, Saint Marys aggregates 0.75" (19mm) of snow. In Saint Marys, during the entire year, snow falls for 52.7 days, and aggregates up to 16.14" (410mm) of snow.

Daylight

The average length of the day in Saint Marys is 14.5h.

Sunshine

The average sunshine in May is 8h.

UV index

May through August, with an average maximum UV index of 5, are months with the highest UV index. A UV Index value of 3 to 5 symbolizes a medium vulnerability from the exposure to the Sun's UV rays for the average person.
Note: The daily maximum UV index of 5 interpret into the following advice:
Take precautions - Protection against the skin and eye damage is obliged. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. 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 Saint Marys?

In May, the average relative humidity is 79%.

How much does it rain in Saint Marys in May?

In Saint Marys, in May, it is raining for 15.7 days, with typically 1.42" (36mm) of accumulated precipitation.

What is the last month it snows in Saint Marys?

May is the last month it regularly snows in Saint Marys, Pennsylvania. During 0.5 snowfall days, in May, Saint Marys aggregates 0.75" (19mm) of snow.

What is the average length of the day in May in Saint Marys?

In May, the average length of the day is 14.5h.

How many hours of sunshine does Saint Marys have in May?

In Saint Marys, the average sunshine in May is 8h.

What are the months with the highest UV index in Saint Marys?

Months with the highest UV index are May through August, with an average maximum UV index of 5.

What is the UV index intensity in May in Saint Marys?

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

Average temperature in May
Saint Marys, PA

Average temperature in May - Saint Marys, PA
  • Average high temperature in May: 66.9°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 (28.8°F).

  • Average low temperature in May: 46.8°F

The month with the highest average low temperature is July (57.2°F).
The coldest month (with the lowest average low temperature) is January (16.3°F).

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Average pressure in May
Saint Marys, PA

Average pressure in May - Saint Marys, PA
  • Average pressure in May: 30"

The month with the highest atmospheric pressure is November (30.12").
The month with the lowest atmospheric pressure is June (29.94").

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Average wind speed in May
Saint Marys, PA

Average wind speed in May - Saint Marys, PA
  • Average wind speed in May: 7mph

The windiest month (with the highest average wind speed) is January (8.9mph).
The calmest month (with the lowest average wind speed) is August (5.5mph).

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Average humidity in May
Saint Marys, PA

Average humidity in May - Saint Marys, PA
  • Average humidity in May: 79%

The month with the highest relative humidity is February (89%).
Months with the lowest relative humidity are June and July (78%).

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Average rainfall in May
Saint Marys, PA

Average rainfall in May - Saint Marys, PA
  • Average rainfall in May: 1.42"

The wettest month (with the highest rainfall) is April (1.5").
The driest months (with the least rainfall) are January and November (0.83").

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Average rainfall days in May
Saint Marys, PA

Average rainfall days in May - Saint Marys, PA
  • Average rainfall days in May: 15.7 days

The month with the highest number of rainy days is May (15.7 days).
The month with the least rainy days is February (5.1 days).

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Average snowfall in May
Saint Marys, PA

Average snowfall in May - Saint Marys, PA
  • Average snowfall in May: 0.75"

The month with the highest snowfall is February (4.21").
Months with the least snowfall are June, July, August and September (0").

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Average snowfall days in May
Saint Marys, PA

Average snowfall days in May - Saint Marys, PA
  • Average snowfall days in May: 0.5 days

The month with the highest number of snowfall days is January (12.2 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
Saint Marys, PA

Average daylight in May / Average sunshine in May - Saint Marys, PA
  • Average daylight in May: 14.5h

The month with the longest days is June (Average daylight: 15.1h).
The month with the shortest days is December (Average daylight: 9.2h).

  • Average sunshine in May: 8h

Months with the most sunshine are July and August (Average sunshine: 9.5h).
The month with the least sunshine is January (Average sunshine: 2.5h).

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Average sunshine days in May
Saint Marys, PA

Average sunshine days in May - Saint Marys, PA
  • Average sunshine days in May: 13 days

The month with the most sunshine days is November (18.9 days).
The month with the least sunshine days is May (13 days).

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Average UV index in May
Saint Marys, PA

Average UV index in May - Saint Marys, PA
  • Average UV index in May: 5

Months with the highest UV index are May, June, July and August (UV index 5).
Months with the lowest UV index are January and December (UV index 1).

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Average cloud cover in May
Saint Marys, PA

Average cloud cover in May - Saint Marys, PA
  • Average cloud cover in May: 52

The month with the most cloud cover is January (Cloud cover 77).
The month with the least cloud cover is July (Cloud cover 42).

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Average visibility in May
Saint Marys, PA

Average visibility in May - Saint Marys, PA
  • Average visibility in May: 5mi

Months with the highest visibility are January, February, March, April, May, June, July, October, November and December (5mi).
Months with the lowest visibility are August and September (4mi).

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