Climate and monthly weather forecast
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 high of 37.8°F (3.2°C) and an average low of 26.1°F (-3.3°C). The coldest month 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). Weather in January »

Weather in February

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

Weather in March

March, the first month of the spring in New Castle, is a fresh month, with an average temperature ranging between max 50°F (10°C) and min 35.1°F (1.7°C). In New Castle, the average high-temperature in March marginally rises from a cold 41.7°F (5.4°C) in February to a fresh 50°F (10°C). Weather in March »

Weather in April

April in New Castle, Delaware, is a comfortable spring month, with temperature in the range of an average low of 45.1°F (7.3°C) and an average high of 61.7°F (16.5°C). In New Castle, 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

The last month of the spring, May, is a pleasant month in New Castle, Delaware, with an average temperature varying between 55°F (12.8°C) and 72°F (22.2°C). In New Castle, the average high-temperature in May increases from a comfortable 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 moderately hot month, with an average temperature ranging between max 80.1°F (26.7°C) and min 63.1°F (17.3°C). In New Castle, Delaware, the average high-temperature in June slightly increases from an agreeable 72°F (22.2°C) in May to a warm 80.1°F (26.7°C). Weather in June »

Weather in July

July, like June, in New Castle, Delaware, is a moderately hot summer month, with an average temperature ranging between max 84.9°F (29.4°C) and min 68.5°F (20.3°C). July is the warmest month, with an average high-temperature of 84.9°F (29.4°C) and an average low-temperature of 68.5°F (20.3°C). In July, the average heat index is computed to be a sweltering 95°F (35°C). Weather in July »

Weather in August

August, the last month of the summer in New Castle, is another warm month, with temperature in the range of an average low of 66.9°F (19.4°C) and an average high of 82.9°F (28.3°C). In New Castle, Delaware, the average high-temperature in August is almost the same as in July - a still moderately hot 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 temperature in the range of an average high of 76.3°F (24.6°C) and an average low of 60.6°F (15.9°C). In New Castle, the average high-temperature in September marginally drops from a moderately hot 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 an average temperature fluctuating between 50.4°F (10.2°C) and 64.8°F (18.2°C). In October, the average high-temperature decreases from a moderately hot 76.3°F (24.6°C) in September to an enjoyable 64.8°F (18.2°C). Weather in October »

Weather in November

November, the last month of the autumn in New Castle, is also a fresh month, 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 New Castle, the average high-temperature in November decreases from a comfortable 64.8°F (18.2°C) in October to a fresh 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 temperature in the range of an average high of 44.1°F (6.7°C) and an average low of 32.9°F (0.5°C). In December, the average high-temperature decreases from a fresh 53.2°F (11.8°C) in November to a chilly 44.1°F (6.7°C). Weather in December »
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FAQ

What is the coldest month in New Castle?

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

What is the driest month in New Castle?

The month with the least rainfall in New Castle, Delaware, is January, when the rain falls for 7.8 days and typically collects 1.38" (35mm) of precipitation.

How many days does it rain in New Castle?

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

When does it snow in New Castle?

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

What is the snowiest month in New Castle?

The month with the most snowfall in New Castle, Delaware, is January, when snow falls for 5.2 days and typically aggregates up to 1.69" (43mm) of snow.

How much does it snow in New Castle?

In New Castle, Delaware, during the entire year, snow falls for 15 days and aggregates up to 5.47" (139mm) of snow.

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

The months with the lowest UV index in New Castle, Delaware, are January, February, November and December, with an average maximum UV index of 2.

What month is the ocean coldest in New Castle?

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

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 in New Castle, Delaware.

When is Daylight Saving Time (DST) in New Castle?

On Sunday, March 13. 2022, at 2:00 am, Daylight Saving Time starts, and the time zone changes from EST to EDT. Daylight Saving Time ends Sunday, November 6. 2022, at 2:00 am, and the time zone reverts from EDT to EST.

What is the least humid month in New Castle?

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

When it does not snow in New Castle?

May through October are months without snowfall.

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

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

When are the longest days in New Castle?

June has the longest days of the year in New Castle, Delaware, with an average of 14h and 56min of daylight.

What is the warmest month in New Castle?

The warmest month in New Castle 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?

The month with the most sunshine in New Castle is July, 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?

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

What is the most humid month in New Castle?

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

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

With an average of 9h and 25min 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"Hg).
The month with the lowest atmospheric pressure is June (29.94"Hg).

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

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).

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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

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 visibility
New Castle, DE

Average visibility - New Castle, DE

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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