Monthly weather forecast and climate
New Castle, NH

January, the same as December, in New Castle, New Hampshire, is another subzero cold winter month, 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 »

February, the last month of the winter, in New Castle, is a cold month, with average temperature ranging between min 22.3°F (-5.4°C) and max 34.2°F (1.2°C). In February, the average high-temperature is essentially the same as in January - a cold 34.2°F (1.2°C). Weather in February »

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

April in New Castle, New Hampshire, is a cool spring month, with temperature in the range of an average high of 51.1°F (10.6°C) and an average low of 38.8°F (3.8°C). In New Castle, the average high-temperature increases, from a wintry 40.5°F (4.7°C) in March, to a cool 51.1°F (10.6°C). Weather in April »

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

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

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). The warmest month is July, 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 »

August, the last month of the summer, in New Castle, is another warm month, with average temperature varying between 75.7°F (24.3°C) and 61.7°F (16.5°C). In New Castle, the average high-temperature is almost the same as in July - a still warm 75.7°F (24.3°C). Weather in August »

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

October, like September, is another mild autumn month in New Castle, New Hampshire, with average temperature ranging between min 47.1°F (8.4°C) and max 57.9°F (14.4°C). In New Castle, New Hampshire, the average high-temperature in October decreases, from an agreeable 69.1°F (20.6°C) in September, to a moderate 57.9°F (14.4°C). Weather in October »

November, the last month of the autumn, in New Castle, is also a frosty month, with average temperature fluctuating between 47.1°F (8.4°C) and 36.1°F (2.3°C). In November, the average high-temperature drops, from a moderate 57.9°F (14.4°C) in October, to a chilly 47.1°F (8.4°C). Weather in November »

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

What is the coldest month in New Castle?

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

How many days does it rain in New Castle?

In New Castle, New Hampshire, 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 are January through April, October through December.

How many days does it snow in New Castle?

Throughout the year, in New Castle, New Hampshire, there are 35.2 snowfall days, and 16.97" (431mm) of snow is accumulated.

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.

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

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

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 is the month with the coldest ocean in New Castle?

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

What are the least humid months in New Castle?

April and November, with an average relative humidity of 75%, are the least humid months.

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, New Hampshire, with an average relative humidity of 80%.

When are the longest days in New Castle?

June has the longest days of the year in New Castle, with an average of 15.3h of daylight.

What is the warmest month in New Castle?

The warmest month is July, with an average high-temperature of 76.3°F (24.6°C) and an average low-temperature of 62.6°F (17°C).

What are the months with the highest UV index in New Castle?

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

When 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 in New Castle.

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?

September is the month with the least rainfall. Rain falls for 11.3 days and accumulates 1.54" (39mm) of precipitation.

What is the wettest month in New Castle?

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

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

With an average of 9.1h of daylight, December has the shortest days of the year in New Castle.
Average temperature - New Castle, NH
Average pressure - New Castle, NH

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

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).

Average humidity - 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").

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).

Average snowfall - New Castle, NH
Average snowfall days - New Castle, NH

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

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).

Average daylight / Average sunshine - New Castle, NH

The month with the longest days is June (Average daylight: 15.3h).
The month with the shortest days is December (Average daylight: 9.1h).

The month with the most sunshine is August (Average sunshine: 10.6h).
Months with the least sunshine are February and December (Average sunshine: 4.8).

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).

Average UV index - New Castle, NH
Average visibility - New Castle, NH

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).