May weather forecast
Bethlehem, PA

A tranquil setting of dry trees and neat fields behind this large hall in the Lehigh University in Bethlehem, Pennsylvania
A tranquil setting of dry trees and neat fields behind this large hall in the Lehigh University in Bethlehem, Pennsylvania

Weather in May

May, the last month of the spring in Bethlehem, is an agreeable month, with an average temperature varying between 50.5°F (10.3°C) and 69.6°F (20.9°C).

Temperature

In Bethlehem, the average high-temperature in May rises from a mild 58.6°F (14.8°C) in April to a pleasant 69.6°F (20.9°C). The average low-temperature, in Bethlehem, is 50.5°F (10.3°C).

Humidity

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

Rainfall

In Bethlehem, in May, during 17.8 rainfall days, 2.72" (69mm) of precipitation is typically accumulated. Throughout the year, in Bethlehem, Pennsylvania, there are 153 rainfall days, and 26.81" (681mm) of precipitation is accumulated.

Snowfall

Months with snowfall in Bethlehem, Pennsylvania, are January through May, October through December. May is the last month it regularly snows. During 0.1 snowfall days, in May, Bethlehem aggregates 0.12" (3mm) of snow. In Bethlehem, Pennsylvania, during the entire year, snow falls for 26.7 days and aggregates up to 14.49" (368mm) of snow.

Daylight

The average length of the day in May in Bethlehem, Pennsylvania, is 14h and 28min.
On the first day of the month, sunrise is at 6:00 am and sunset at 7:57 pm. On the last day of May, sunrise is at 5:33 am and sunset at 8:25 pm EDT.

Sunshine

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

UV index

The months with the highest UV index in Bethlehem are May through July, with an average maximum UV index of 6. A UV Index value of 6 to 7 symbolizes a high health risk from exposure to the Sun's UV radiation for ordinary individuals.
Note: The average daily UV index of 6 in May transform into the following instructions:
Take precautions against overexposure. Fair-skinned people may get burned in less than 20 minutes. The Sun's UV radiation is most powerful between 10 a.m. and 4 p.m. To the extent possible, limit exposure to the direct sun during these hours. A wide-brim hat offers excellent sun protection for the eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun. 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 Bethlehem?

In May, in Bethlehem, the average high-temperature is 69.6°F (20.9°C), and the average low-temperature is 50.5°F (10.3°C).

What is the average humidity in May in Bethlehem?

In May, the average relative humidity is 79%.

How much does it rain in Bethlehem in May?

In May, in Bethlehem, the rain falls for 17.8 days. Throughout May, 2.72" (69mm) of precipitation is accumulated.

What is the last month it snows in Bethlehem?

May is the last month it regularly snows in Bethlehem. During 0.1 snowfall days, in May, Bethlehem aggregates 0.12" (3mm) of snow.

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

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

What time are sunrise and sunset in May in Bethlehem?

In May, on the first day of the month, sunrise is at 6:00 am and sunset at 7:57 pm. On the last day of the month, in Bethlehem, Pennsylvania, sunrise is at 5:33 am and sunset at 8:25 pm EDT.

How long on average sun shines in May in Bethlehem?

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

What is the month with the highest UV index in Bethlehem?

The months with the highest UV index in Bethlehem are May through July, with an average maximum UV index of 6.

What is the UV index reading in May in Bethlehem?

The average daily maximum UV index in May is 6. A UV Index reading of 6 to 7 represents a high health threat from exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in May
Bethlehem, PA

Average temperature in May - Bethlehem, PA
  • Average high temperature in May: 69.6°F

The warmest month (with the highest average high temperature) is July (83.5°F).
The month with the lowest average high temperature is January (34°F).

  • Average low temperature in May: 50.5°F

The month with the highest average low temperature is July (63.5°F).
The coldest month (with the lowest average low temperature) is January (21.6°F).

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Average pressure in May
Bethlehem, PA

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

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

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Average wind speed in May
Bethlehem, PA

Average wind speed in May - Bethlehem, 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 (5mph).

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Average humidity in May
Bethlehem, PA

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

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

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Average rainfall in May
Bethlehem, PA

Average rainfall in May - Bethlehem, PA
  • Average rainfall in May: 2.72"

The wettest month (with the highest rainfall) is July (2.91").
The driest month (with the least rainfall) is September (1.57").

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Average rainfall days in May
Bethlehem, PA

Average rainfall days in May - Bethlehem, PA
  • Average rainfall days in May: 17.8 days

The month with the highest number of rainy days is May (17.8 days).
The month with the least rainy days is January (7.8 days).

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Average snowfall in May
Bethlehem, PA

Average snowfall in May - Bethlehem, PA
  • Average snowfall in May: 0.12"

The month with the highest snowfall is March (4.13").
The months with the least snowfall are June, July, August and September (0").

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Average snowfall days in May
Bethlehem, PA

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

The months with the highest number of snowfall days are January and February (7.8 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
Bethlehem, PA

Average daylight in May / Average sunshine in May - Bethlehem, PA
  • Average daylight in May: 14h and 28min

The month with the longest days is June (Average daylight: 15h and 2min).
The month with the shortest days is December (Average daylight: 9h and 19min).

  • Average sunshine in May: 8h and 18min

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
Bethlehem, PA

Average sunshine days in May - Bethlehem, PA
  • Average sunshine days in May: 11 days

The month with the most sunshine days is November (18.9 days).
The month with the least sunshine days is May (11 days).

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Average UV index in May
Bethlehem, PA

Average UV index in May - Bethlehem, PA
  • Average UV index in May: 6

The months with the highest UV index are May, June and July (UV index 6).
The months with the lowest UV index are January, February, March, November and December (UV index 2).

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Average cloud cover in May
Bethlehem, PA

Average cloud cover in May - Bethlehem, 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
Bethlehem, PA

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

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

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