April weather forecast
New Castle, DE

Weather in April

April in New Castle, Delaware, is an enjoyable spring month, with average temperature ranging between max 61.7°F (16.5°C) and min 45.1°F (7.3°C).

Temperature

In New Castle, the average high-temperature rises, from a cool 50°F (10°C) in March, to a comfortable 61.7°F (16.5°C). In April, in New Castle, the average low-temperature is 45.1°F (7.3°C).

Humidity

The least humid month in New Castle is April, with an average relative humidity of 72%.

Rainfall

In New Castle, during April, the rain falls for 13.7 days and regularly aggregates up to 1.69" (43mm) of precipitation. In New Castle, during the entire year, the rain falls for 143.2 days and collects up to 21.89" (556mm) of precipitation.

Snowfall

January through April, November and December are months with snowfall. April is the last month it regularly snows. During 0.3 snowfall days, New Castle aggregates 0.16" (4mm) of snow. In New Castle, during the entire year, snow falls for 15 days, and aggregates up to 5.47" (139mm) of snow.

Ocean temperature

In New Castle, the average seawater temperature in April is 47.7°F (8.7°C).
Note: Swimming in 47.7°F (8.7°C) is considered dangerous. Unprotected immersion in temperatures below 50°F (10°C) causes quickly maximum intensity cold shock with hyperventilation.

Daylight

In New Castle, Delaware, the average length of the day is 13.3h.

Sunshine

The average sunshine in April is 8.6h.

UV index

The average daily maximum UV index in New Castle, Delaware, is 4. A UV Index reading of 3 to 5 represents a moderate threat to health from unsafe exposure to the UV radiation for ordinary individuals.
Note: The daily maximum UV index of 4 interpret into the following advice:
Take precautions - Protection against sunburn is recommended. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes. 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 least humid month in New Castle?

With an average relative humidity of 72%, April is the least humid month.

What is the average humidity in April in New Castle?

The average relative humidity in April in New Castle is 72%.

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

In New Castle, in April, it is raining for 13.7 days, with typically 1.69" (43mm) of accumulated precipitation.

What is the last month it snows in New Castle?

April is the last month it regularly snows in New Castle, Delaware. During 0.3 snowfall days, in April, New Castle aggregates 0.16" (4mm) of snow.

What is the water temperature in April in New Castle?

In April, the average ocean temperature is 47.7°F (8.7°C). Swimming in 47.7°F (8.7°C) is considered life-threatening. Even a few minutes in 55.4°F (13°C) water is uncomfortable, and swimming below 50°F (10°C) may cause total loss of breathing control and cold shock, depending on a person's physique.

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

In April, the average length of the day in New Castle is 13.3h.

How long on average sun shines in April in New Castle?

The average sunshine in April is 8.6h.

What is the UV index intensity in April in New Castle?

In New Castle, the average daily maximum UV index in April is 4. A UV Index value of 3 to 5 symbolizes a moderate vulnerability from unprotected exposure to the UV radiation.

Average temperature in April
New Castle, DE

Average temperature in April - New Castle, DE
  • Average high temperature in April: 61.7°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 April: 45.1°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).

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Average pressure in April
New Castle, DE

Average pressure in April - New Castle, DE
  • Average pressure in April: 29.99"

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

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Average wind speed in April
New Castle, DE

Average wind speed in April - New Castle, DE
  • Average wind speed in April: 8.7mph

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).

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Average humidity in April
New Castle, DE

Average humidity in April - New Castle, DE
  • Average humidity in April: 72%

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

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Average rainfall in April
New Castle, DE

Average rainfall in April - New Castle, DE
  • Average rainfall in April: 1.69"

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

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Average rainfall days in April
New Castle, DE

Average rainfall days in April - New Castle, DE
  • Average rainfall days in April: 13.7 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).

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Average snowfall in April
New Castle, DE

Average snowfall in April - New Castle, DE
  • Average snowfall in April: 0.16"

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

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Average snowfall days in April
New Castle, DE

Average snowfall days in April - New Castle, DE
  • Average snowfall days in April: 0.3 days

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

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Average sea temperature in April
New Castle, DE

Average sea temperature in April - New Castle, DE
  • Average sea temperature in April: 47.6°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).

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

Average daylight in April / Average sunshine in April - New Castle, DE
  • Average daylight in April: 13.3h

The month with the longest days is June (Average daylight: 14.9h).
The month with the shortest days is December (Average daylight: 9.4h).

  • Average sunshine in April: 8.6h

The month with the most sunshine is July (Average sunshine: 10.8h).
The month with the least sunshine is February (Average sunshine: 4.9h).

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Average sunshine days in April
New Castle, DE

Average sunshine days in April - New Castle, DE
  • Average sunshine days in April: 14.4 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).

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Average UV index in April
New Castle, DE

Average UV index in April - New Castle, DE
  • Average UV index in April: 4

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

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Average cloud cover in April
New Castle, DE

Average cloud cover in April - New Castle, DE
  • Average cloud cover in April: 42

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).

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Average visibility in April
New Castle, DE

Average visibility in April - New Castle, DE
  • Average visibility in April: 6mi

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

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