May weather forecast
Hellertown, PA

Weather in May

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

Temperature

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

Humidity

In May, the average relative humidity is 79%.

Rainfall

In Hellertown, Pennsylvania, during May, the rain falls for 17.8 days and regularly aggregates up to 2.72" (69mm) of precipitation. Throughout the year, in Hellertown, there are 153 rainfall days, and 26.81" (681mm) of precipitation is accumulated.

Snowfall

Months with snowfall in Hellertown are January through May, October through December. May is the last month it regularly snows. During 0.1 snowfall days, in May, Hellertown aggregates 0.12" (3mm) of snow. In Hellertown, 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 is 14h and 28min.
On the first day of May, sunrise is at 5:59 am and sunset at 7:57 pm. On the last day of the month, sunrise is at 5:33 am and sunset at 8:25 pm EDT.

Sunshine

In May, the average sunshine is 8.3h.

UV index

May through July, with an average maximum UV index of 6, are months with the highest UV index. A UV Index estimate of 6 to 7 represents a high health risk from unprotected exposure to Sun's UV rays for the average person.
Note: In May, the average maximum UV index of 6 translate into the following recommendations:
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. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects. 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 Hellertown?

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

How many days does it rain in May in Hellertown?

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

What is the last month it snows in Hellertown?

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

How many hours of daylight does Hellertown have in May?

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

What time are sunrise and sunset in May in Hellertown?

In May, on the first day of the month, sunrise is at 5:59 am and sunset at 7:57 pm. On the last day of the month, in Hellertown, sunrise is at 5:33 am and sunset at 8:25 pm EDT.

How long on average sun shines in May in Hellertown?

The average sunshine duration in May in Hellertown, Pennsylvania, is 8.3h.

What are the months with the highest UV index in Hellertown?

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

How high is the UV index in May in Hellertown?

In May, the average daily maximum UV index in Hellertown, Pennsylvania, is 6. A UV Index value of 6 to 7 symbolizes a high health vulnerability from unsafe exposure to Sun's UV rays.

Average temperature in May
Hellertown, PA

Average temperature in May - Hellertown, 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
Hellertown, PA

Average pressure in May - Hellertown, 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
Hellertown, PA

Average wind speed in May - Hellertown, 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
Hellertown, PA

Average humidity in May - Hellertown, 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
Hellertown, PA

Average rainfall in May - Hellertown, 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
Hellertown, PA

Average rainfall days in May - Hellertown, 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
Hellertown, PA

Average snowfall in May - Hellertown, 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
Hellertown, PA

Average snowfall days in May - Hellertown, 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
Hellertown, PA

Average daylight in May / Average sunshine in May - Hellertown, 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 20min).

  • Average sunshine in May: 8.3h

The month with the most sunshine is July (Average sunshine: 10.4h).
The month with the least sunshine is February (Average sunshine: 4.5h).

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Average sunshine days in May
Hellertown, PA

Average sunshine days in May - Hellertown, 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
Hellertown, PA

Average UV index in May - Hellertown, 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
Hellertown, PA

Average cloud cover in May - Hellertown, 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
Hellertown, PA

Average visibility in May - Hellertown, 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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