Monthly weather forecast and climate
Hackettstown, NJ

Weather in January

January, the same as December, is a wintry winter month in Hackettstown, New Jersey, with average temperature varying between 21°F (-6.1°C) and 33.8°F (1°C). The coldest month is January, with an average high-temperature of 33.8°F (1°C) and an average low-temperature of 21°F (-6.1°C). Weather in January »

Weather in February

February, the last month of the winter, in Hackettstown, is another cold month, with average temperature ranging between max 37.4°F (3°C) and min 22.5°F (-5.3°C). In February, the average high-temperature is relatively the same as in January - a still wintry 37.4°F (3°C). Weather in February »

Weather in March

March, the first month of the spring, in Hackettstown, is a chilly month, with temperature in the range of an average high of 45.5°F (7.5°C) and an average low of 30°F (-1.1°C). In Hackettstown, the average high-temperature in March marginally rises, from a wintry 37.4°F (3°C) in February, to a chilly 45.5°F (7.5°C). Weather in March »

Weather in April

April in Hackettstown, New Jersey, is a moderate spring month, with average temperature ranging between min 40.1°F (4.5°C) and max 57.9°F (14.4°C). In April, the average high-temperature increases, from a chilly 45.5°F (7.5°C) in March, to a mild 57.9°F (14.4°C). Weather in April »

Weather in May

May, the last month of the spring, in Hackettstown, is a pleasant month, with temperature in the range of an average high of 69.1°F (20.6°C) and an average low of 50°F (10°C). In May, the average high-temperature increases, from a moderate 57.9°F (14.4°C) in April, to a pleasant 69.1°F (20.6°C). Weather in May »

Weather in June

The first month of the summer, June, is a warm month in Hackettstown, New Jersey, with average temperature varying between 56.8°F (13.8°C) and 77°F (25°C). In June, the average high-temperature marginally rises, from a pleasant 69.1°F (20.6°C) in May, to a moderately hot 77°F (25°C). Weather in June »

Weather in July

July, like June, in Hackettstown, New Jersey, is a moderately hot summer month, with temperature in the range of an average low of 63°F (17.2°C) and an average high of 82.9°F (28.3°C). With an average high-temperature of 82.9°F (28.3°C) and an average low-temperature of 63°F (17.2°C), July is the warmest month. In July, the average heat index is appraised at a tropical 90.3°F (32.4°C). Weather in July »

Weather in August

The last month of the summer, August, is another warm month in Hackettstown, New Jersey, with average temperature fluctuating between 81°F (27.2°C) and 61.3°F (16.3°C). In August, the average high-temperature is essentially the same as in July - a still moderately hot 81°F (27.2°C). Weather in August »

Weather in September

The first month of the autumn, September, is still a warm month in Hackettstown, New Jersey, with temperature in the range of an average high of 74.3°F (23.5°C) and an average low of 55°F (12.8°C). In September, the average high-temperature slightly decreases, from a moderately hot 81°F (27.2°C) in August, to a still warm 74.3°F (23.5°C). Weather in September »

Weather in October

October, like September, in Hackettstown, New Jersey, is another enjoyable autumn month, with average temperature fluctuating between 61.7°F (16.5°C) and 45.7°F (7.6°C). In Hackettstown, the average high-temperature decreases, from a warm 74.3°F (23.5°C) in September, to an enjoyable 61.7°F (16.5°C). Weather in October »

Weather in November

November, the last month of the autumn, in Hackettstown, is also a frosty month, with temperature in the range of an average low of 34.9°F (1.6°C) and an average high of 49.1°F (9.5°C). In November, the average high-temperature decreases, from an enjoyable 61.7°F (16.5°C) in October, to a chilly 49.1°F (9.5°C). Weather in November »

Weather in December

December, the first month of the winter, in Hackettstown, is still a cold month, with average temperature ranging between max 40.1°F (4.5°C) and min 28.4°F (-2°C). In December, the average high-temperature decreases, from a frosty 49.1°F (9.5°C) in November, to a wintry 40.1°F (4.5°C). Weather in December »
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FAQ

What is the coldest month in Hackettstown?

With an average high-temperature of 33.8°F (1°C) and an average low-temperature of 21°F (-6.1°C), January is the coldest month in Hackettstown.

How much does it rain in Hackettstown?

Throughout the year, there are 106.9 rainfall days, and 9.84" (250mm) of precipitation is accumulated.

When does it snow in Hackettstown?

January through May, October through December are months with snowfall in Hackettstown.

How many days does it snow in Hackettstown?

In Hackettstown, New Jersey, during the entire year, snow falls for 21.7 days, and aggregates up to 3.94" (100mm) of snow.

What is the most humid month in Hackettstown?

February, October and December, with an average relative humidity of 81%, are most humid months in Hackettstown.

When does it snow the most in Hackettstown?

February is the month with the most snowfall. Snow falls for 6.5 days and accumulates 0.98" (25mm) of snow.

What is the month with the least sunshine in Hackettstown?

The month with the least sunshine in Hackettstown, New Jersey, is February, with an average of 4.5h of sunshine.

What is the least humid month in Hackettstown?

With an average relative humidity of 76%, April is the least humid month.

When it does not snow in Hackettstown?

In Hackettstown, New Jersey, snow does not fall in June through September.

When are the longest days in Hackettstown?

June has the longest days of the year in Hackettstown, with an average of 15.1h of daylight.

What are the months with the highest UV index in Hackettstown?

June and July, with an average maximum UV index of 6, are months with the highest UV index in Hackettstown, New Jersey.

What is the warmest month in Hackettstown?

The warmest month in Hackettstown is July, with an average high-temperature of 82.9°F (28.3°C) and an average low-temperature of 63°F (17.2°C).

What is the rainiest month in Hackettstown?

The month with the most rainfall in Hackettstown is July when the rain falls for 11.8 days and typically aggregates up to 1.18" (30mm) of precipitation.

What month has the most sunshine in Hackettstown?

July has the most sunshine of the year in Hackettstown, with an average of 10.3h of sunshine.

What is the driest month in Hackettstown?

September is the month with the least rainfall in Hackettstown, New Jersey. Rain falls for 7.7 days and accumulates 0.35" (9mm) of precipitation.

What is the month with the shortest days in Hackettstown?

December has the shortest days of the year in Hackettstown, New Jersey, with an average of 9.3h of daylight.

When is the lowest UV index in Hackettstown?

The month with the lowest UV index in Hackettstown, New Jersey, is December, with an average maximum UV index of 1.

Average pressure
Hackettstown, NJ

Average pressure - Hackettstown, NJ

The month with the highest atmospheric pressure is November (30.11").
The month with the lowest atmospheric pressure is June (29.93").

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Average wind speed
Hackettstown, NJ

Average wind speed - Hackettstown, NJ

The windiest month (with the highest average wind speed) is March (8mph).
The calmest month (with the lowest average wind speed) is August (4.9mph).

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Average humidity
Hackettstown, NJ

Average humidity - Hackettstown, NJ

Months with the highest relative humidity are February, October and December (81%).
The month with the lowest relative humidity is April (76%).

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Average rainfall
Hackettstown, NJ

Average rainfall - Hackettstown, NJ

The wettest month (with the highest rainfall) is July (1.18").
The driest month (with the least rainfall) is September (0.35").

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Average rainfall days
Hackettstown, NJ

Average rainfall days - Hackettstown, NJ

The month with the highest number of rainy days is May (12.2 days).
The month with the least rainy days is January (5.9 days).

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Average snowfall
Hackettstown, NJ

Average snowfall - Hackettstown, NJ

The month with the highest snowfall is February (0.98").
Months with the least snowfall are June, July, August and September (0").

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Average snowfall days
Hackettstown, NJ

Average snowfall days - Hackettstown, NJ

The month with the highest number of snowfall days is February (6.5 days).
Months with the least snowfall days are June, July, August and September (0 days).

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Average daylight / Average sunshine
Hackettstown, NJ

Average daylight / Average sunshine - Hackettstown, NJ

The month with the longest days is June (Average daylight: 15.1h).
The month with the shortest days is December (Average daylight: 9.3h).

The month with the most sunshine is July (Average sunshine: 10.3h).
The month with the least sunshine is February (Average sunshine: 4.5h).

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Average sunshine days
Hackettstown, NJ

Average sunshine days - Hackettstown, NJ

The month with the most sunshine days is January (21.5 days).
The month with the least sunshine days is May (15.4 days).

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Average visibility
Hackettstown, NJ

Average visibility - Hackettstown, NJ

Months with the highest visibility are January, March, April, November and December (6mi).
Months with the lowest visibility are February, May, June, July, August, September and October (5mi).

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