May weather forecast
New Castle, DE

Weather in May

May, the last month of the spring in New Castle, is an agreeable month, with an average temperature varying between 55°F (12.8°C) and 72°F (22.2°C).

Temperature

In New Castle, Delaware, the average high-temperature in May increases from an enjoyable 61.7°F (16.5°C) in April to an agreeable 72°F (22.2°C). The average low-temperature, in New Castle, is 55°F (12.8°C).

Humidity

In May, the average relative humidity in New Castle is 77%.

Rainfall

In New Castle, during May, the rain falls for 16.8 days and regularly aggregates up to 2.05" (52mm) of precipitation. Throughout the year, in New Castle, there are 143.2 rainfall days, and 21.89" (556mm) of precipitation is accumulated.

Snowfall

In New Castle, snow does not fall through October.

Ocean temperature

In May, the average ocean temperature in New Castle, Delaware, is 54°F (12.2°C).
Note: At temperatures below 50°F (10°C), swimming in a suitably protected swimsuit is feasible; otherwise, cold shock and loss of breathing control are imminent. Even a short swim, without thermal protection, at temperatures around 55.4°F (13°C) is not comfortable.

Daylight

The average length of the day in May is 14h and 23min.
On the first day of the month, sunrise is at 6:02 am and sunset at 7:56 pm. On the last day of May, in New Castle, sunrise is at 5:36 am and sunset at 8:23 pm EDT.

Sunshine

In New Castle, the average sunshine in May is 8.7h.

UV index

The months with the highest UV index are May through August, with an average maximum UV index of 6. A UV Index reading of 6 to 7 represents a high threat to health from exposure to the Sun's UV rays for average 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. Seek shade and minimize exposure to direct Sun in a period between 10 a.m. and 4 p.m. when UV radiation is most intense; keep in mind that shade structures like parasols or canopies do not provide perfect sun protection. 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.
[Resources]

FAQ

What is the average humidity in May in New Castle?

The average relative humidity in May in New Castle, Delaware, is 77%.

How many days does it rain in May in New Castle?

In New Castle, in May, during 16.8 rainfall days, 2.05" (52mm) of precipitation is typically accumulated.

When it does not snow in New Castle?

May through October are months without snowfall.

Does it snow in New Castle in May?

In May, it doesn't snow. April is the latest month when it typically snows.

How cold is the water in May in New Castle?

In New Castle, Delaware, the average seawater temperature in May is 54°F (12.2°C). At temperatures below 50°F (10°C), swimming in a suitably protected swimsuit is feasible; otherwise, cold shock and loss of breathing control are imminent. Even a short swim, without thermal protection, at temperatures around 55.4°F (13°C) is not comfortable.

How many hours of daylight does New Castle have in May?

The average day length in May in New Castle, Delaware, is 14h and 23min.

What time are sunrise and sunset in May in New Castle?

On the first day of May in New Castle, sunrise is at 6:02 am and sunset at 7:56 pm. On the last day of the month, sunrise is at 5:36 am and sunset at 8:23 pm EDT.

How many hours of sunshine does New Castle have in May?

In New Castle, the average sunshine duration in May is 8.7h.

What is the month with the highest UV index in New Castle?

The months with the highest UV index in New Castle are May through August, with an average maximum UV index of 6.

How high is the UV index in May in New Castle?

In New Castle, the average daily maximum UV index in May is 6. A UV Index of 6 to 7 symbolizes a high health threat from unsafe 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
New Castle, DE

Average temperature in May - New Castle, DE
  • Average high temperature in May: 72°F

The warmest month (with the highest average high temperature) is July (84.9°F).
The month with the lowest average high temperature is January (37.8°F).

  • Average low temperature in May: 55°F

The month with the highest average low temperature is July (68.5°F).
The coldest month (with the lowest average low temperature) is January (26.1°F).

[Resources]

Average pressure in May
New Castle, DE

Average pressure in May - New Castle, DE
  • Average pressure in May: 30.01"Hg

The month with the highest atmospheric pressure is November (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.94"Hg).

[Resources]

Average wind speed in May
New Castle, DE

Average wind speed in May - New Castle, DE
  • Average wind speed in May: 6.9mph

The windiest months (with the highest average wind speed) are February and March (8.8mph).
The calmest month (with the lowest average wind speed) is August (5.4mph).

[Resources]

Average humidity in May
New Castle, DE

Average humidity in May - New Castle, DE
  • Average humidity in May: 77%

The month with the highest relative humidity is October (78%).
The month with the lowest relative humidity is April (72%).

[Resources]

Average rainfall in May
New Castle, DE

Average rainfall in May - New Castle, DE
  • Average rainfall in May: 2.05"

The wettest month (with the highest rainfall) is August (2.83").
The driest month (with the least rainfall) is January (1.38").

[Resources]

Average rainfall days in May
New Castle, DE

Average rainfall days in May - New Castle, DE
  • Average rainfall days in May: 16.8 days

The month with the highest number of rainy days is May (16.8 days).
The month with the least rainy days is January (7.8 days).

[Resources]

Average snowfall in May
New Castle, DE

Average snowfall in May - New Castle, DE
  • Average snowfall in May: 0"

The month with the highest snowfall is January (1.69").
The months with the least snowfall are May, June, July, August, September and October (0").

[Resources]

Average snowfall days in May
New Castle, DE

Average snowfall days in May - New Castle, DE
  • Average snowfall days in May: 0 days

The month with the highest number of snowfall days is January (5.2 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).

[Resources]

Average sea temperature in May
New Castle, DE

Average sea temperature in May - New Castle, DE
  • Average sea temperature in May: 53.9°F

The best month for swimming (with the highest average sea temperature) is August (76.3°F).
The coldest month (with the lowest average sea temperature) is February (40.9°F).

[Resources]

Average daylight in May /
Average sunshine in May
New Castle, DE

Average daylight in May / Average sunshine in May - New Castle, DE
  • Average daylight in May: 14h and 23min

The month with the longest days is June (Average daylight: 14h and 56min).
The month with the shortest days is December (Average daylight: 9h and 25min).

  • Average sunshine in May: 8h and 42min

The month with the most sunshine is July (Average sunshine: 10h and 48min).
The month with the least sunshine is February (Average sunshine: 4h and 54min).

[Resources]

Average sunshine days in May
New Castle, DE

Average sunshine days in May - New Castle, DE
  • Average sunshine days in May: 11.8 days

The month with the most sunshine days is November (20.1 days).
The month with the least sunshine days is May (11.8 days).

[Resources]

Average UV index in May
New Castle, DE

Average UV index in May - New Castle, DE
  • 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).

[Resources]

Average cloud cover in May
New Castle, DE

Average cloud cover in May - New Castle, DE
  • Average cloud cover in May: 45

The months with the most cloud cover are February and March (Cloud cover 46).
The month with the least cloud cover is July (Cloud cover 30).

[Resources]

Average visibility in May
New Castle, DE

Average visibility in May - New Castle, DE
  • 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).

[Resources]

Weather forecast for your location

1. Click Locate me button
2. Allow the app to use your location
* you will be automatically redirected to the weather forecast for your location