May weather forecast
Marcus Hook, PA

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Weather in May

May, the last month of the spring in Marcus Hook, is a pleasant month, with an average temperature varying between 72°F (22.2°C) and 55°F (12.8°C).

Temperature

Noticing a change, the average high-temperature during May moves from April's refreshing 61.5°F (16.4°C) to a pleasant 72°F (22.2°C). The temperature dips to an average of 55°F (12.8°C) during May nights.

Humidity

In May, the average relative humidity is 76%.

Rainfall

In Marcus Hook, Pennsylvania, in May, during 16.3 rainfall days, 2.32" (59mm) of precipitation is typically accumulated. Throughout the year, there are 148.4 rainfall days, and 25.94" (659mm) of precipitation is accumulated.

Snowfall

January through May, November and December are months with snowfall in Marcus Hook. May is the last month it regularly snows. During 0.1 snowfall days, in May, Marcus Hook aggregates 0.16" (4mm) of snow. In Marcus Hook, during the entire year, snow falls for 12.6 days and aggregates up to 7.28" (185mm) of snow.

Ocean temperature

In Marcus Hook, the average seawater temperature in May is 54°F (12.2°C).
Note: One needs to be cautious in 54°F (12.2°C) waters. 55.4°F (13°C) is already forbidding, but sub14°F (-10°C) can seriously disrupt your breathing and lead to a frigid shock, considering one's well-being.

Daylight

The average length of the day in May is 14h and 23min.
On the first day of the month, sunrise is at 6:00 am and sunset at 7:56 pm. On the last day of May, in Marcus Hook, Pennsylvania, sunrise is at 5:35 am and sunset at 8:23 pm EDT.

Sunshine

In May, the average sunshine is 8.7h.

UV index

The months with the highest UV index in Marcus Hook are May through August, with an average maximum UV index of 6. A UV Index value of 6 to 7 symbolizes a high health vulnerability from exposure to the Sun's UV rays for the average person.
Note: A maximum high UV index of 6 in May translates into the following recommendations:
Conform to measures and uphold sun safety traditions. Warding off skin and eye harm is necessary. Avoid direct sunlight between the hours of 10 a.m. and 4 p.m., when UV radiation is at its peak. Keep in mind that shade structures may not provide complete protection. Sunglasses providing both UVA and UVB protection are non-negotiable on sunlit days. Warning! The reflection from snow can nearly magnify the Sun's UV radiation twofold.
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Frequently asked questions

What are the temperatures in Marcus Hook in May?

The high-temperature, in May, in Marcus Hook, is 72°F (22.2°C), while the low-temperature averages to 55°F (12.8°C).

What is the average humidity in May in Marcus Hook?

In May, the average relative humidity in Marcus Hook, Pennsylvania, is 76%.

How many days does it rain in May in Marcus Hook?

In May, in Marcus Hook, the rain falls for 16.3 days. Throughout May, 2.32" (59mm) of precipitation is accumulated.

What is the last month it snows in Marcus Hook?

May is the last month it regularly snows. During 0.1 snowfall days, in May, Marcus Hook aggregates 0.16" (4mm) of snow.

What is the ocean temperature in May in Marcus Hook?

In May, the average ocean temperature in Marcus Hook, Pennsylvania, is 54°F (12.2°C). Swimming in 54°F (12.2°C) is considered dangerous. Unprotected immersion in temperatures below 50°F (10°C) causes quickly maximum intensity cold shock with hyperventilation.

What is the average length of the day in May in Marcus Hook?

The average day length in May is 14h and 23min.

When is the sunrise / sunset in May in Marcus Hook?

In May, on the first day of the month, sunrise is at 6:00 am and sunset at 7:56 pm. On the last day of the month, in Marcus Hook, Pennsylvania, sunrise is at 5:35 am and sunset at 8:23 pm EDT.

How many hours of sunshine does Marcus Hook have in May?

In Marcus Hook, Pennsylvania, the average sunshine duration in May is 8.7h.

When is the highest UV index in Marcus Hook?

May through August, with an average maximum UV index of 6, are months with the highest UV index in Marcus Hook, Pennsylvania.

What is the UV index intensity in May in Marcus Hook?

In Marcus Hook, the average daily maximum UV index in May is 6. A UV Index estimate of 6 to 7 represents a high health threat 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
Marcus Hook, PA

Average temperature in May - Marcus Hook, PA
  • Average high temperature in May: 72°F

The warmest month (with the highest average high temperature) is July (85.6°F).
The month with the lowest average high temperature is January (37.4°F).

  • Average low temperature in May: 55°F

The month with the highest average low temperature is July (68.7°F).
The coldest month (with the lowest average low temperature) is January (25.7°F).

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Average pressure in May
Marcus Hook, PA

Average pressure in May - Marcus Hook, 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
Marcus Hook, PA

Average wind speed in May - Marcus Hook, PA
  • Average wind speed in May: 6.8mph

The windiest month (with the highest average wind speed) is March (8.6mph).
The calmest months (with the lowest average wind speed) are July and August (5.5mph).

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Average humidity in May
Marcus Hook, PA

Average humidity in May - Marcus Hook, PA
  • Average humidity in May: 76%

The months with the highest relative humidity are February, October and December (77%).
The month with the lowest relative humidity is April (71%).

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Average rainfall in May
Marcus Hook, PA

Average rainfall in May - Marcus Hook, PA
  • Average rainfall in May: 2.32"

The wettest month (with the highest rainfall) is August (3.11").
The driest month (with the least rainfall) is January (1.61").

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Average rainfall days in May
Marcus Hook, PA

Average rainfall days in May - Marcus Hook, PA
  • Average rainfall days in May: 16.3 days

The month with the highest number of rainy days is July (17 days).
The month with the least rainy days is January (7.1 days).

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Average snowfall in May
Marcus Hook, PA

Average snowfall in May - Marcus Hook, PA
  • Average snowfall in May: 0.16"

The month with the highest snowfall is March (2.32").
The months with the least snowfall are June, July, August, September and October (0").

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Average snowfall days in May
Marcus Hook, PA

Average snowfall days in May - Marcus Hook, PA
  • Average snowfall days in May: 0.1 days

The month with the highest number of snowfall days is February (3.8 days).
The months with the least snowfall days are June, July, August, September and October (0 days).

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Average sea temperature in May
Marcus Hook, PA

Average sea temperature in May - Marcus Hook, PA
  • Average sea temperature in May: 53.9°F

The best month for swimming (with the highest average sea temperature) is August (75.9°F).
The coldest month (with the lowest average sea temperature) is February (39.9°F).

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Average daylight in May /
Average sunshine in May
Marcus Hook, PA

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

The month with the longest days is June (Average daylight: 14h and 54min).
The month with the shortest days is December (Average daylight: 9h and 24min).

  • Average sunshine in May: 8h and 4min

The month with the most sunshine is July (Average sunshine: 10h and 42min).
The month with the least sunshine is February (Average sunshine: 4h and 54min).

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Average sunshine days in May
Marcus Hook, PA

Average sunshine days in May - Marcus Hook, PA
  • Average sunshine days in May: 12.7 days

The month with the most sunshine days is January (20.8 days).
The month with the least sunshine days is July (11.3 days).

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Average UV index in May
Marcus Hook, PA

Average UV index in May - Marcus Hook, PA
  • Average UV index in May: 6

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

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Average cloud cover in May
Marcus Hook, PA

Average cloud cover in May - Marcus Hook, PA
  • Average cloud cover in May: 45

The month with the most cloud cover is February (Cloud cover 47).
The month with the least cloud cover is July (Cloud cover 30).

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Average visibility in May
Marcus Hook, PA

Average visibility in May - Marcus Hook, PA
  • Average visibility in May: 6mi

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

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Marcus Hook, Pennsylvania, USA

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