May weather forecast
Belfast, PA

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Weather in May

May, the last month of the spring in Belfast, is a pleasant month, with an average temperature fluctuating between 68.5°F (20.3°C) and 49.8°F (9.9°C).

Temperature

In May, the average high-temperature increases from a refreshing 57.6°F (14.2°C) in April to an agreeable 68.5°F (20.3°C). Belfast, in the month of May, anticipates a consistent average low-temperature of 49.8°F (9.9°C).

Humidity

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

Rainfall

In Belfast, during May, the rain falls for 14.9 days and regularly aggregates up to 1.89" (48mm) of precipitation. Throughout the year, there are 139.9 rainfall days, and 19.88" (505mm) of precipitation is accumulated.

Snowfall

January through May, October through December are months with snowfall. May is the last month it regularly snows in Belfast. During 0.2 snowfall days, in May, Belfast aggregates 0.31" (8mm) of snow. Throughout the year, in Belfast, there are 24.7 snowfall days, and 10.94" (278mm) of snow is accumulated.

Daylight

In May, the average length of the day in Belfast, Pennsylvania, is 14h and 28min.
On the first day of May, sunrise is at 5:58 am and sunset at 7:57 pm. On the last day of the month, sunrise is at 5:31 am and sunset at 8:25 pm EDT.

Sunshine

In May, the average sunshine in Belfast is 8.3h.

UV index

In May, the average daily maximum UV index is 5. A UV Index estimate of 3 to 5 represents a medium health hazard from unprotected exposure to Sun's UV rays for the average person.
Note: The daily high UV index of 5 during May translates into the following recommendations:
Heed the precautions - It is counselled to guard against solar damage. When the Sun is at its strongest around midday, find shade and limit exposure. Shield yourself from the harmful effects of UV radiation with sun-protective attire, a hat, and quality sunglasses. Remember this! The UV radiation of the Sun can be nearly doubled by the reflective properties of snow.
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Frequently asked questions

What is the usual temperature for Belfast in May?

During May, Belfast experiences an average high-temperature of 68.5°F (20.3°C) and a low-temperature of 49.8°F (9.9°C).

What is the average humidity in May in Belfast?

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

How many days does it rain in May in Belfast?

In May, in Belfast, Pennsylvania, the rain falls for 14.9 days. Throughout May, 1.89" (48mm) of precipitation is accumulated.

What is the last month it snows in Belfast?

May is the last month it regularly snows. During 0.2 snowfall days, in May, Belfast aggregates 0.31" (8mm) of snow.

How many hours of daylight does Belfast have in May?

In Belfast, Pennsylvania, the average day length in May is 14h and 28min.

When are sunrise and sunset in May in Belfast?

In May, on the first day of the month, sunrise is at 5:58 am and sunset at 7:57 pm. On the last day of the month, in Belfast, Pennsylvania, sunrise is at 5:31 am and sunset at 8:25 pm EDT.

How long on average sun shines in May in Belfast?

In May, the average sunshine duration in Belfast is 8.3h.

How high is the UV index in May in Belfast?

The average daily maximum UV index in May in Belfast is 5. A UV Index value of 3 to 5 symbolizes a medium hazard to health from unprotected exposure to 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
Belfast, PA

Average temperature in May - Belfast, PA
  • Average high temperature in May: 68.5°F

The warmest month (with the highest average high temperature) is July (82.9°F).
The month with the lowest average high temperature is January (33.4°F).

  • Average low temperature in May: 49.8°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 (20.7°F).

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Average pressure in May
Belfast, PA

Average pressure in May - Belfast, PA
  • Average pressure in May: 30.01"Hg

The month with the highest atmospheric pressure is November (30.11"Hg).
The month with the lowest atmospheric pressure is June (29.94"Hg).

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Average wind speed in May
Belfast, PA

Average wind speed in May - Belfast, PA
  • Average wind speed in May: 6.2mph

The windiest month (with the highest average wind speed) is March (8.1mph).
The calmest month (with the lowest average wind speed) is August (4.9mph).

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Average humidity in May
Belfast, PA

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

The month with the highest relative humidity is February (82%).
The month with the lowest relative humidity is April (76%).

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Average rainfall in May
Belfast, PA

Average rainfall in May - Belfast, PA
  • Average rainfall in May: 1.89"

The wettest month (with the highest rainfall) is July (2.32").
The driest month (with the least rainfall) is September (1.02").

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Average rainfall days in May
Belfast, PA

Average rainfall days in May - Belfast, PA
  • Average rainfall days in May: 14.9 days

The month with the highest number of rainy days is July (15.1 days).
The month with the least rainy days is January (7.3 days).

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Average snowfall in May
Belfast, PA

Average snowfall in May - Belfast, PA
  • Average snowfall in May: 0.31"

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

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Average snowfall days in May
Belfast, PA

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

The month with the highest number of snowfall days is February (6.8 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
Belfast, PA

Average daylight in May / Average sunshine in May - Belfast, PA
  • Average daylight in May: 14h and 3min

The month with the longest days is June (Average daylight: 15h and 6min).
The month with the shortest days is December (Average daylight: 9h and 18min).

  • Average sunshine in May: 8h and 2min

The month with the most sunshine is July (Average sunshine: 10h and 24min).
The month with the least sunshine is February (Average sunshine: 4h and 30min).

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Average sunshine days in May
Belfast, PA

Average sunshine days in May - Belfast, PA
  • Average sunshine days in May: 13.1 days

The month with the most sunshine days is January (19.3 days).
The month with the least sunshine days is July (13 days).

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Average UV index in May
Belfast, PA

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

The month with the highest UV index is June (UV index 6).
The month with the lowest UV index is December (UV index 1).

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Average cloud cover in May
Belfast, PA

Average cloud cover in May - Belfast, PA
  • Average cloud cover in May: 48

The month with the most cloud cover is February (Cloud cover 51).
The month with the least cloud cover is July (Cloud cover 34).

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Average visibility in May
Belfast, PA

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

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

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Belfast, Pennsylvania, USA

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