May weather forecast
Monroeville, PA

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Weather in May

The last month of the spring, May, is a pleasant month in Monroeville, Pennsylvania, with an average temperature fluctuating between 71.8°F (22.1°C) and 51.1°F (10.6°C).

Temperature

May's arrival sees a rise in the average high-temperature, jumping from April's refreshing 60.1°F (15.6°C) to a pleasant 71.8°F (22.1°C). Throughout the May nights, Monroeville encounters a low-temperature of 51.1°F (10.6°C).

Humidity

In May, the average relative humidity is 78%.

Rainfall

May is the month with the most rainfall. Rain falls for 18.2 days and accumulates 2.56" (65mm) of precipitation.

Snowfall

Months with snowfall are January through May, October through December. May is the last month it regularly snows. During 0.1 snowfall days, in May, Monroeville aggregates 0.04" (1mm) of snow. Throughout the year, there are 35.4 snowfall days, and 10.35" (263mm) of snow is accumulated.

Daylight

In Monroeville, the average length of the day in May is 14h and 26min.
On the first day of the month, sunrise is at 6:17 am and sunset at 8:15 pm. On the last day of May, sunrise is at 5:51 am and sunset at 8:42 pm EDT.

Sunshine

The average sunshine in May is 8.8h.

UV index

The average daily maximum UV index in May is 5. A UV Index reading of 3 to 5 represents a moderate health risk from exposure to the Sun's UV radiation for average individuals.
Note: The maximum daily UV index of 5 in May converts into the following recommendations:
Take precautions - Protection against sun damage is advised. The best time to avoid the Sun's harmful UV radiation is during midday when it's most potent. Protect your eyes, ears, face, and neck from the Sun by wearing a wide-brimmed hat. Note this! The Sun's UV radiation can nearly be doubled by the reflection off snow.
Updated: Aug 30, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What is the average May temperature?

In May, the average high-temperature and low-temperature are 71.8°F (22.1°C) and 51.1°F (10.6°C) respectively.

What is the average humidity in May?

In Monroeville, the average relative humidity in May is 78%.

What is the wettest month?

May is the month with the most rainfall. Rain falls for 18.2 days and accumulates 2.56" (65mm) of precipitation.

How many days does it rain in May?

In Monroeville, in May, it is raining for 18.2 days, with typically 2.56" (65mm) of accumulated precipitation.

What is the last month it snows?

May is the last month it regularly snows. During 0.1 snowfall days, in May, Monroeville aggregates 0.04" (1mm) of snow.

How many hours of daylight does Monroeville have in May?

The average day length in May is 14h and 26min.

When is the sunrise / sunset in May?

In May, on the first day of the month, sunrise is at 6:17 am and sunset at 8:15 pm. On the last day of the month, sunrise is at 5:51 am and sunset at 8:42 pm EDT.

How many hours of sunshine does Monroeville have in May?

In Monroeville, the average sunshine duration in May is 8.8h.

What is the UV index intensity in May?

The average daily maximum UV index in May is 5. A UV Index of 3 to 5 symbolizes a medium health risk from exposure to the Sun's UV radiation.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in May
Monroeville, PA

Average temperature in May - Monroeville, PA
  • Average high temperature in May: 71.8°F

The warmest month (with the highest average high temperature) is July (83.1°F).
The month with the lowest average high temperature is January (33.1°F).

  • Average low temperature in May: 51.1°F

The month with the highest average low temperature is July (61.3°F).
The coldest month (with the lowest average low temperature) is January (20.7°F).

Average pressure in May
Monroeville, PA

Average pressure in May - Monroeville, PA
  • Average pressure in May: 30"Hg

The month with the highest atmospheric pressure is November (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.95"Hg).

Average wind speed in May
Monroeville, PA

Average wind speed in May - Monroeville, PA
  • Average wind speed in May: 6.1mph

The windiest month (with the highest average wind speed) is January (8.1mph).
The calmest month (with the lowest average wind speed) is August (4.7mph).

Average humidity in May
Monroeville, PA

Average humidity in May - Monroeville, PA
  • Average humidity in May: 78%

The month with the highest relative humidity is February (85%).
The months with the lowest relative humidity are April, July and August (76%).

Average rainfall in May
Monroeville, PA

Average rainfall in May - Monroeville, PA
  • Average rainfall in May: 2.56"

The wettest month (with the highest rainfall) is May (2.56").
The driest month (with the least rainfall) is November (1.06").

Average rainfall days in May
Monroeville, PA

Average rainfall days in May - Monroeville, PA
  • Average rainfall days in May: 18.2 days

The month with the highest number of rainy days is May (18.2 days).
The month with the least rainy days is January (7.7 days).

Average snowfall in May
Monroeville, PA

Average snowfall in May - Monroeville, PA
  • Average snowfall in May: 0.04"

The month with the highest snowfall is February (2.52").
The months with the least snowfall are June, July, August and September (0").

Average snowfall days in May
Monroeville, PA

Average snowfall days in May - Monroeville, PA
  • Average snowfall days in May: 0.1 days

The month with the highest number of snowfall days is January (9.7 days).
The months with the least snowfall days are June, July, August and September (0 days).

Average daylight in May /
Average sunshine in May
Monroeville, PA

Average daylight in May / Average sunshine in May - Monroeville, PA
  • Average daylight in May: 14h and 2min

The month with the longest days is June (Average daylight: 15h and 0min).
The month with the shortest days is December (Average daylight: 9h and 18min).

  • Average sunshine in May: 8h and 5min

The month with the most sunshine is August (Average sunshine: 10h and 12min).
The month with the least sunshine is January (Average sunshine: 2h and 54min).

Average sunshine days in May
Monroeville, PA

Average sunshine days in May - Monroeville, PA
  • Average sunshine days in May: 10.1 days

The month with the most sunshine days is November (19.6 days).
The month with the least sunshine days is May (10.1 days).

Average UV index in May
Monroeville, PA

Average UV index in May - Monroeville, 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).

Average cloud cover in May
Monroeville, PA

Average cloud cover in May - Monroeville, PA
  • Average cloud cover in May: 44

The month with the most cloud cover is January (Cloud cover 69).
The month with the least cloud cover is August (Cloud cover 33).

Average visibility in May
Monroeville, PA

Average visibility in May - Monroeville, PA
  • Average visibility in May: 5mi

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

Monroeville, Pennsylvania, USA

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