May weather forecast and climate
Delaware, NJ

Weather in May

May, the last month of the spring, in Delaware, is an agreeable month, with average temperature ranging between min 48.7°F (9.3°C) and max 68.2°F (20.1°C).

Temperature

In Delaware, New Jersey, the average high-temperature rises, from a moderate 56.1°F (13.4°C) in April, to an agreeable 68.2°F (20.1°C). The average low-temperature, in May, is 48.7°F (9.3°C).

Humidity

In May, the average relative humidity is 79%.

Rainfall

In Delaware, New Jersey, in May, during 17.3 rainfall days, 3.03" (77mm) of precipitation is typically accumulated. In Delaware, during the entire year, the rain falls for 165.9 days and collects up to 31.61" (803mm) of precipitation.

Snowfall

Months with snowfall are January through May, October through December. May is the last month it regularly snows in Delaware. During 0.3 snowfall days, Delaware aggregates 0.51" (13mm) of snow. In Delaware, during the entire year, snow falls for 42.7 days, and aggregates up to 21.26" (540mm) of snow.

Daylight

In May, the average length of the day in Delaware is 14.5h.

Sunshine

In Delaware, New Jersey, the average sunshine in May is 8.4h.

UV index

In Delaware, the average daily maximum UV index is 5. A UV Index of 3 to 5 symbolizes a medium health hazard from the exposure to the Sun's UV radiation for the ordinary person.
Note: The daily maximum UV index of 5 interpret into the following advice:
Take precautions - Protection against sun damage is advised. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. 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. Caution! The reflection of snow can nearly double the intensity of the Sun's UV radiation.
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FAQ

What is the average humidity in May in Delaware?

The average relative humidity in May is 79%.

How many days does it rain in May in Delaware?

In Delaware, New Jersey, in May, it is raining for 17.3 days, with typically 3.03" (77mm) of accumulated precipitation.

What is the last month it snows in Delaware?

May is the last month it regularly snows in Delaware, New Jersey. During 0.3 snowfall days, in May, Delaware aggregates 0.51" (13mm) of snow.

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

In May, the average length of the day is 14.5h.

How long on average sun shines in May in Delaware?

In Delaware, New Jersey, the average sunshine in May is 8.4h.

What is the UV index reading in May in Delaware?

In May, the average daily maximum UV index in Delaware, New Jersey, is 5. A UV Index reading of 3 to 5 represents a medium hazard to health from unsafe exposure to the Sun's UV rays.

Average temperature in May
Delaware, NJ

Average temperature in May - Delaware, NJ
  • Average high temperature in May: 68.2°F

The warmest month (with the highest average high temperature) is July (82.2°F).
The month with the lowest average high temperature is January (32.5°F).

  • Average low temperature in May: 48.7°F

The month with the highest average low temperature is July (61.2°F).
The coldest month (with the lowest average low temperature) is January (19.8°F).

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Average pressure in May
Delaware, NJ

Average pressure in May - Delaware, NJ
  • Average pressure in May: 30.01"

The month with the highest atmospheric pressure is November (30.11").
The month with the lowest atmospheric pressure is June (29.93").

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Average wind speed in May
Delaware, NJ

Average wind speed in May - Delaware, NJ
  • Average wind speed in May: 6.1mph

The windiest months (with the highest average wind speed) are January, February and March (7.8mph).
The calmest month (with the lowest average wind speed) is August (4.9mph).

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Average humidity in May
Delaware, NJ

Average humidity in May - Delaware, NJ
  • Average humidity in May: 79%

Months with the highest relative humidity are February, October and December (82%).
The month with the lowest relative humidity is April (76%).

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Average rainfall in May
Delaware, NJ

Average rainfall in May - Delaware, NJ
  • Average rainfall in May: 3.03"

The wettest month (with the highest rainfall) is July (3.11").
The driest month (with the least rainfall) is September (1.81").

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Average rainfall days in May
Delaware, NJ

Average rainfall days in May - Delaware, NJ
  • Average rainfall days in May: 17.3 days

The month with the highest number of rainy days is July (17.4 days).
The month with the least rainy days is February (9.5 days).

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Average snowfall in May
Delaware, NJ

Average snowfall in May - Delaware, NJ
  • Average snowfall in May: 0.51"

The month with the highest snowfall is February (5.67").
Months with the least snowfall are June, July, August and September (0").

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Average snowfall days in May
Delaware, NJ

Average snowfall days in May - Delaware, NJ
  • Average snowfall days in May: 0.3 days

The month with the highest number of snowfall days is January (11.4 days).
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
Delaware, NJ

Average daylight in May / Average sunshine in May - Delaware, NJ
  • Average daylight in May: 14.5h

The month with the longest days is June (Average daylight: 15.1h).
The month with the shortest days is December (Average daylight: 9.3h).

  • Average sunshine in May: 8.4h

The month with the most sunshine is July (Average sunshine: 10.2h).
The month with the least sunshine is February (Average sunshine: 4.3h).

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Average sunshine days in May
Delaware, NJ

Average sunshine days in May - Delaware, NJ
  • Average sunshine days in May: 11.6 days

The month with the most sunshine days is November (16.4 days).
The month with the least sunshine days is June (11.1 days).

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Average UV index in May
Delaware, NJ

Average UV index in May - Delaware, NJ
  • 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
Delaware, NJ

Average cloud cover in May - Delaware, NJ
  • Average cloud cover in May: 48

The month with the most cloud cover is February (Cloud cover 52).
The month with the least cloud cover is July (Cloud cover 35).

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Average visibility in May
Delaware, NJ

Average visibility in May - Delaware, NJ
  • Average visibility in May: 5mi

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

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