Monthly weather forecast and climate
New Castle, DE

Weather in January

January, like December, in New Castle, Delaware, is another cold winter month, with temperature in the range of an average low of 26.1°F (-3.3°C) and an average high of 37.8°F (3.2°C). January is the coldest month, with an average high-temperature of 37.8°F (3.2°C) and an average low-temperature of 26.1°F (-3.3°C). Weather in January »

Weather in February

February, the last month of the winter, in New Castle, is another cold month, with average temperature varying between 41.7°F (5.4°C) and 28.4°F (-2°C). In February, the average high-temperature is almost the same as in January - a still wintry 41.7°F (5.4°C). Weather in February »

Weather in March

The first month of the spring, March, is a cool month in New Castle, Delaware, with average temperature ranging between max 50°F (10°C) and min 35.1°F (1.7°C). In New Castle, the average high-temperature slightly increases, from a wintry 41.7°F (5.4°C) in February, to a cool 50°F (10°C). Weather in March »

Weather in April

April in New Castle, Delaware, is a comfortable spring month, with average temperature ranging between min 45.1°F (7.3°C) and max 61.7°F (16.5°C). In New Castle, Delaware, the average high-temperature in April increases, from a cool 50°F (10°C) in March, to an enjoyable 61.7°F (16.5°C). Weather in April »

Weather in May

May, the last month of the spring, in New Castle, is a pleasant month, with average temperature varying between 55°F (12.8°C) and 72°F (22.2°C). In May, the average high-temperature rises, from an enjoyable 61.7°F (16.5°C) in April, to a pleasant 72°F (22.2°C). Weather in May »

Weather in June

June, the first month of the summer, in New Castle, is a warm month, with average temperature ranging between max 80.1°F (26.7°C) and min 63.1°F (17.3°C). In June, the average high-temperature slightly increases, from an agreeable 72°F (22.2°C) in May, to a moderately hot 80.1°F (26.7°C). Weather in June »

Weather in July

July, the same as June, is another warm summer month in New Castle, Delaware, with average temperature varying between 68.5°F (20.3°C) and 84.9°F (29.4°C). With an average high-temperature of 84.9°F (29.4°C) and an average low-temperature of 68.5°F (20.3°C), July is the warmest month. In July, the average heat index is estimated at a hot 94.5°F (34.7°C). Weather in July »

Weather in August

August, the last month of the summer, in New Castle, is also a moderately hot month, with average temperature varying between 82.9°F (28.3°C) and 66.9°F (19.4°C). In August, the average high-temperature is essentially the same as in July - a still warm 82.9°F (28.3°C). Weather in August »

Weather in September

The first month of the autumn, September, is still a warm month in New Castle, Delaware, with average temperature varying between 60.6°F (15.9°C) and 76.3°F (24.6°C). In September, the average high-temperature slightly decreases, from 82.9°F (28.3°C) in August, to a still warm 76.3°F (24.6°C). Weather in September »

Weather in October

October, like September, in New Castle, Delaware, is another comfortable autumn month, with temperature in the range of an average low of 50.4°F (10.2°C) and an average high of 64.8°F (18.2°C). In October, the average high-temperature decreases, from a warm 76.3°F (24.6°C) in September, to a comfortable 64.8°F (18.2°C). Weather in October »

Weather in November

The last month of the autumn, November, is also a fresh month in New Castle, Delaware, with temperature in the range of an average high of 53.2°F (11.8°C) and an average low of 39.6°F (4.2°C). In November, the average high-temperature decreases, from a comfortable 64.8°F (18.2°C) in October, to a cool 53.2°F (11.8°C). Weather in November »

Weather in December

The first month of the winter, December, is still a chilly month in New Castle, Delaware, with average temperature varying between 32.9°F (0.5°C) and 44.1°F (6.7°C). In December, the average high-temperature drops, from a cool 53.2°F (11.8°C) in November, to a frosty 44.1°F (6.7°C). Weather in December »
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FAQ

What is the coldest month in New Castle?

The coldest month in New Castle is January, with an average high-temperature of 37.8°F (3.2°C) and an average low-temperature of 26.1°F (-3.3°C).

How many days does it rain in New Castle?

Throughout the year, in New Castle, Delaware, there are 143.2 rainfall days, and 21.89" (556mm) of precipitation is accumulated.

What is the driest month in New Castle?

January is the month with the least rainfall in New Castle. Rain falls for 7.8 days and accumulates 1.38" (35mm) of precipitation.

When does it snow in New Castle?

Months with snowfall in New Castle, Delaware, are January through April, November and December.

How many days does it snow in New Castle?

Throughout the year, in New Castle, Delaware, there are 15 snowfall days, and 5.47" (139mm) of snow is accumulated.

What is the snowiest month in New Castle?

January is the month with the most snowfall. Snow falls for 5.2 days and accumulates 1.69" (43mm) of snow.

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

Months with the lowest UV index are January, February, November and December, with an average maximum UV index of 2.

When is the ocean coldest in New Castle?

The month with the coldest seawater is February, with an average ocean temperature of 41°F (5°C).

What is the month with the least sunshine in New Castle?

With an average of 4.9h of sunshine, February has the least sunshine of the year.

What is the least humid month in New Castle?

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

When it does not snow in New Castle?

In New Castle snow does not fall in May through October.

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

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

When are the longest days in New Castle?

The month with the longest days in New Castle, Delaware, is June, with an average of 14.9h of daylight.

What is the warmest month in New Castle?

The warmest month is July, with an average high-temperature of 84.9°F (29.4°C) and an average low-temperature of 68.5°F (20.3°C).

What month has the most sunshine in New Castle?

July has the most sunshine of the year, with an average of 10.8h of sunshine.

What is the wettest month in New Castle?

The month with the most rainfall in New Castle is August when the rain falls for 14.7 days and typically aggregates up to 2.83" (72mm) of precipitation.

What month is the ocean warmest in New Castle?

With an average ocean temperature of 76.3°F (24.6°C), August is the month with the warmest seawater in New Castle.

What is the most humid month in New Castle?

The most humid month in New Castle, Delaware, is October, with an average relative humidity of 78%.

What is the month with the shortest days in New Castle?

With an average of 9.4h of daylight, December has the shortest days of the year in New Castle, Delaware.

Average temperature
New Castle, DE

Average temperature - New Castle, DE

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).

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
New Castle, DE

Average pressure - New Castle, DE

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
New Castle, DE

Average wind speed - New Castle, DE

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 rainfall
New Castle, DE

Average rainfall - New Castle, DE

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
New Castle, DE

Average rainfall days - New Castle, DE

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
New Castle, DE

Average snowfall - New Castle, DE

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
New Castle, DE

Average snowfall days - New Castle, DE

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
New Castle, DE

Average sea temperature - New Castle, DE

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 / Average sunshine
New Castle, DE

Average daylight / Average sunshine - New Castle, DE

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

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
New Castle, DE

Average sunshine days - New Castle, DE

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
New Castle, DE

Average UV index - New Castle, DE

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 visibility
New Castle, DE

Average visibility - New Castle, DE

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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