Climate and monthly weather forecast
New Castle, NH

Weather in January

January, like December, is another subzero cold winter month in New Castle, New Hampshire, with temperature in the range of an average low of 21.2°F (-6°C) and an average high of 31.8°F (-0.1°C). With an average high-temperature of 31.8°F (-0.1°C) and an average low-temperature of 21.2°F (-6°C), January is the coldest month. Weather in January »

Weather in February

The last month of the winter, February, is a cold month in New Castle, New Hampshire, with an average temperature varying between 22.3°F (-5.4°C) and 34.2°F (1.2°C). In New Castle, the average high-temperature in February is relatively the same as in January - a wintry 34.2°F (1.2°C). Weather in February »

Weather in March

March, the first month of the spring in New Castle, is still a cold month, with an average temperature fluctuating between 40.5°F (4.7°C) and 28.8°F (-1.8°C). In March, the average high-temperature marginally rises from a wintry 34.2°F (1.2°C) in February to a still cold 40.5°F (4.7°C). Weather in March »

Weather in April

April in New Castle, New Hampshire, is a fresh spring month, with an average temperature ranging between max 51.1°F (10.6°C) and min 38.8°F (3.8°C). In New Castle, the average high-temperature in April rises from a wintry 40.5°F (4.7°C) in March to a cool 51.1°F (10.6°C). Weather in April »

Weather in May

May, the last month of the spring in New Castle, is an enjoyable month, with an average temperature fluctuating between 48°F (8.9°C) and 61°F (16.1°C). In May, the average high-temperature rises from a fresh 51.1°F (10.6°C) in April to an enjoyable 61°F (16.1°C). Weather in May »

Weather in June

June, the first month of the summer in New Castle, is a pleasant month, with an average temperature fluctuating between 69.3°F (20.7°C) and 55.4°F (13°C). In New Castle, the average high-temperature in June slightly increases from a comfortable 61°F (16.1°C) in May to a pleasant 69.3°F (20.7°C). Weather in June »

Weather in July

July is a moderately hot summer month in New Castle, New Hampshire, with temperature in the range of an average low of 62.6°F (17°C) and an average high of 76.3°F (24.6°C). July is the warmest month, with an average high-temperature of 76.3°F (24.6°C) and an average low-temperature of 62.6°F (17°C). Weather in July »

Weather in August

The last month of the summer, August, is also a moderately hot month in New Castle, New Hampshire, with an average temperature fluctuating between 61.7°F (16.5°C) and 75.7°F (24.3°C). In August, the average high-temperature is relatively the same as in July - a still moderately hot 75.7°F (24.3°C). Weather in August »

Weather in September

The first month of the autumn, September, is still a pleasant month in New Castle, New Hampshire, with an average temperature ranging between max 69.1°F (20.6°C) and min 56.1°F (13.4°C). In New Castle, the average high-temperature in September slightly decreases from a warm 75.7°F (24.3°C) in August to an agreeable 69.1°F (20.6°C). Weather in September »

Weather in October

October, like September, is a moderate autumn month in New Castle, New Hampshire, with temperature in the range of an average low of 47.1°F (8.4°C) and an average high of 57.9°F (14.4°C). In New Castle, the average high-temperature in October drops from a pleasant 69.1°F (20.6°C) in September to a moderate 57.9°F (14.4°C). Weather in October »

Weather in November

November, the last month of the autumn in New Castle, is another chilly month, with an average temperature ranging between max 47.1°F (8.4°C) and min 36.1°F (2.3°C). In November, the average high-temperature decreases from a moderate 57.9°F (14.4°C) in October to a chilly 47.1°F (8.4°C). Weather in November »

Weather in December

The first month of the winter, December, is still a cold month in New Castle, New Hampshire, with an average temperature ranging between max 37.6°F (3.1°C) and min 28°F (-2.2°C). In December, the average high-temperature drops from a frosty 47.1°F (8.4°C) in November to a wintry 37.6°F (3.1°C). Weather in December »
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FAQ

What is the coldest month in New Castle?

With an average high-temperature of 31.8°F (-0.1°C) and an average low-temperature of 21.2°F (-6°C), January is the coldest month in New Castle, New Hampshire.

How much does it rain in New Castle?

In New Castle, during the entire year, the rain falls for 144.2 days and collects up to 27.48" (698mm) of precipitation.

When does it snow in New Castle?

Months with snowfall in New Castle, New Hampshire, are January through April, October through December.

What is the snowiest month in New Castle?

January is the month with the most snowfall. Snow falls for 8.8 days and accumulates 4.02" (102mm) of snow.

How many days does it snow in New Castle?

In New Castle, New Hampshire, during the entire year, snow falls for 35.2 days and aggregates up to 16.97" (431mm) of snow.

When is the lowest UV index in New Castle?

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

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

February and December, with an average of 4.8h of sunshine, are months with the least sunshine in New Castle, New Hampshire.

What month is the ocean coldest in New Castle?

The month with the coldest seawater in New Castle, New Hampshire, is March, with an average ocean temperature of 38.5°F (3.6°C).

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

On Sunday, March 13. 2022, at 2:00 am, Daylight Saving Time starts in New Castle, New Hampshire, 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?

The months with the lowest humidity in New Castle, New Hampshire, are April and November, with an average relative humidity of 75%.

When it does not snow in New Castle?

In New Castle, New Hampshire, snow does not fall in May through September.

What is the most humid month in New Castle?

June is the most humid month in New Castle, with an average relative humidity of 80%.

When are the longest days in New Castle?

June has the longest days of the year, with an average of 15h and 19min of daylight.

What is the warmest month in New Castle?

With an average high-temperature of 76.3°F (24.6°C) and an average low-temperature of 62.6°F (17°C), July is the warmest month in New Castle.

When is the highest UV index in New Castle?

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

What month is the ocean warmest in New Castle?

With an average ocean temperature of 65.7°F (18.7°C), August is the month with the warmest seawater.

What month has the most sunshine in New Castle?

August has the most sunshine of the year, with an average of 10.6h of sunshine.

What is the driest month in New Castle?

The month with the least rainfall in New Castle, New Hampshire, is September, when the rain falls for 11.3 days and typically collects 1.54" (39mm) of precipitation.

What is the rainiest month in New Castle?

October is the month with the most rainfall. Rain falls for 13.3 days and accumulates 2.83" (72mm) of precipitation.

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

December has the shortest days of the year, with an average of 9h and 4min of daylight.

Average temperature
New Castle, NH

Average temperature - New Castle, NH

The warmest month (with the highest average high temperature) is July (76.3°F).
The month with the lowest average high temperature is January (31.8°F).

The month with the highest average low temperature is July (62.6°F).
The coldest month (with the lowest average low temperature) is January (21.2°F).

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Average pressure
New Castle, NH

Average pressure - New Castle, NH

The month with the highest atmospheric pressure is November (30.06"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).

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Average wind speed
New Castle, NH

Average wind speed - New Castle, NH

The windiest month (with the highest average wind speed) is January (11.7mph).
The calmest month (with the lowest average wind speed) is July (6.6mph).

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Average humidity
New Castle, NH

Average humidity - New Castle, NH

The month with the highest relative humidity is June (80%).
The months with the lowest relative humidity are April and November (75%).

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Average rainfall
New Castle, NH

Average rainfall - New Castle, NH

The wettest month (with the highest rainfall) is October (2.83").
The driest month (with the least rainfall) is September (1.54").

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Average rainfall days
New Castle, NH

Average rainfall days - New Castle, NH

The month with the highest number of rainy days is June (15 days).
The month with the least rainy days is January (7.5 days).

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Average snowfall
New Castle, NH

Average snowfall - New Castle, NH

The month with the highest snowfall is January (4.02").
The months with the least snowfall are May, June, July, August and September (0").

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Average snowfall days
New Castle, NH

Average snowfall days - New Castle, NH

The month with the highest number of snowfall days is January (8.8 days).
The months with the least snowfall days are May, June, July, August and September (0 days).

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Average sea temperature
New Castle, NH

Average sea temperature - New Castle, NH

The best month for swimming (with the highest average sea temperature) is August (65.6°F).
The coldest month (with the lowest average sea temperature) is March (38.5°F).

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Average daylight / Average sunshine
New Castle, NH

Average daylight / Average sunshine - New Castle, NH

The month with the longest days is June (Average daylight: 15h and 19min).
The month with the shortest days is December (Average daylight: 9h and 4min).

The month with the most sunshine is August (Average sunshine: 10h and 36min).
The months with the least sunshine are February and December (Average sunshine: 4h and 48min).

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Average sunshine days
New Castle, NH

Average sunshine days - New Castle, NH

The month with the most sunshine days is September (16.8 days).
The month with the least sunshine days is April (13.2 days).

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Average UV index
New Castle, NH

Average UV index - New Castle, NH

The months with the highest UV index are July and August (UV index 6).
The months with the lowest UV index are January, February, March, November and December (UV index 2).

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Average visibility
New Castle, NH

Average visibility - New Castle, NH

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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