Monthly weather forecast and climate
Rock Mill, NJ

Weather in January

January, like December, in Rock Mill, New Jersey, is another cold winter month, with average temperature varying between 23.5°F (-4.7°C) and 36.5°F (2.5°C). January is the coldest month, with an average high-temperature of 36.5°F (2.5°C) and an average low-temperature of 23.5°F (-4.7°C). Weather in January »

Weather in February

February, the last month of the winter, in Rock Mill, is another cold month, with average temperature varying between 26.1°F (-3.3°C) and 39.7°F (4.3°C). In February, the average high-temperature is essentially the same as in January - a still cold 39.7°F (4.3°C). Weather in February »

Weather in March

The first month of the spring, March, is a chilly month in Rock Mill, New Jersey, with temperature in the range of an average low of 33.1°F (0.6°C) and an average high of 48°F (8.9°C). In March, the average high-temperature slightly increases, from a cold 39.7°F (4.3°C) in February, to a frosty 48°F (8.9°C). Weather in March »

Weather in April

April is a mild spring month in Rock Mill, New Jersey, with average temperature varying between 43.2°F (6.2°C) and 60.3°F (15.7°C). In April, the average high-temperature rises, from a chilly 48°F (8.9°C) in March, to a moderate 60.3°F (15.7°C). Weather in April »

Weather in May

The last month of the spring, May, is a pleasant month in Rock Mill, New Jersey, with average temperature varying between 70.3°F (21.3°C) and 52.9°F (11.6°C). In May, the average high-temperature increases, from a moderate 60.3°F (15.7°C) in April, to an agreeable 70.3°F (21.3°C). Weather in May »

Weather in June

June, the first month of the summer, in Rock Mill, is a warm month, with average temperature ranging between min 60.1°F (15.6°C) and max 78.3°F (25.7°C). In Rock Mill, the average high-temperature slightly increases, from a pleasant 70.3°F (21.3°C) in May, to a moderately hot 78.3°F (25.7°C). Weather in June »

Weather in July

July, the same as June, is another warm summer month in Rock Mill, New Jersey, with temperature in the range of an average low of 66.7°F (19.3°C) and an average high of 84.6°F (29.2°C). The warmest month is July, with an average high-temperature of 84.6°F (29.2°C) and an average low-temperature of 66.7°F (19.3°C). In July, the average heat index is estimated at a hot 93.6°F (34.2°C). Weather in July »

Weather in August

The last month of the summer, August, is another warm month in Rock Mill, New Jersey, with average temperature fluctuating between 64.9°F (18.3°C) and 82.4°F (28°C). In August, the average high-temperature is practically the same as in July - a still moderately hot 82.4°F (28°C). Weather in August »

Weather in September

September, the first month of the autumn, in Rock Mill, is still a warm month, with average temperature ranging between max 75.7°F (24.3°C) and min 58.1°F (14.5°C). In September, the average high-temperature marginally drops, from a warm 82.4°F (28°C) in August, to a still moderately hot 75.7°F (24.3°C). Weather in September »

Weather in October

October, the same as September, is another enjoyable autumn month in Rock Mill, New Jersey, with temperature in the range of an average high of 63.9°F (17.7°C) and an average low of 48.4°F (9.1°C). In Rock Mill, New Jersey, the average high-temperature in October decreases, from a warm 75.7°F (24.3°C) in September, to an enjoyable 63.9°F (17.7°C). Weather in October »

Weather in November

The last month of the autumn, November, is another cool month in Rock Mill, New Jersey, with average temperature fluctuating between 37.6°F (3.1°C) and 51.6°F (10.9°C). In Rock Mill, the average high-temperature in November decreases, from a comfortable 63.9°F (17.7°C) in October, to a cool 51.6°F (10.9°C). Weather in November »

Weather in December

December, the first month of the winter, in Rock Mill, is also a wintry month, with temperature in the range of an average high of 42.4°F (5.8°C) and an average low of 31.1°F (-0.5°C). In December, the average high-temperature decreases, from a fresh 51.6°F (10.9°C) in November, to a wintry 42.4°F (5.8°C). Weather in December »
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FAQ

What is the coldest month in Rock Mill?

January is the coldest month, with an average high-temperature of 36.5°F (2.5°C) and an average low-temperature of 23.5°F (-4.7°C).

How much does it rain in Rock Mill?

In Rock Mill, during the entire year, the rain falls for 107.3 days and collects up to 8.82" (224mm) of precipitation.

When does it snow in Rock Mill?

January through May, November and December are months with snowfall.

How much does it snow in Rock Mill?

In Rock Mill, during the entire year, snow falls for 15.5 days, and aggregates up to 2.76" (70mm) of snow.

What is the month with the lowest UV index in Rock Mill?

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

What is the most humid month in Rock Mill?

Months with the highest humidity are February and October, with an average relative humidity of 79%.

What is the month with the least sunshine in Rock Mill?

With an average of 4.7h of sunshine, February has the least sunshine of the year in Rock Mill, New Jersey.

When does it snow the most in Rock Mill?

March is the month with the most snowfall in Rock Mill, New Jersey. Snow falls for 3.7 days and accumulates 0.75" (19mm) of snow.

What is the least humid month in Rock Mill?

April is the least humid month, with an average relative humidity of 74%.

What are the months with the highest UV index in Rock Mill?

Months with the highest UV index in Rock Mill are May through August, with an average maximum UV index of 6.

When it does not snow in Rock Mill?

In Rock Mill, New Jersey, snow does not fall in June through October.

When are the longest days in Rock Mill?

June has the longest days of the year in Rock Mill, New Jersey, with an average of 15h of daylight.

What is the warmest month in Rock Mill?

July is the warmest month in Rock Mill, New Jersey, with an average high-temperature of 84.6°F (29.2°C) and an average low-temperature of 66.7°F (19.3°C).

What is the wettest month in Rock Mill?

July is the month with the most rainfall. Rain falls for 12.9 days and accumulates 1.18" (30mm) of precipitation.

What month has the most sunshine in Rock Mill?

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

What is the driest month in Rock Mill?

The month with the least rainfall is September when the rain falls for 8.5 days and typically collects 0.35" (9mm) of precipitation.

What is the month with the shortest days in Rock Mill?

December has the shortest days of the year in Rock Mill, with an average of 9.3h of daylight.

Average temperature
Rock Mill, NJ

Average temperature - Rock Mill, NJ

The warmest month (with the highest average high temperature) is July (84.6°F).
The month with the lowest average high temperature is January (36.5°F).

The month with the highest average low temperature is July (66.7°F).
The coldest month (with the lowest average low temperature) is January (23.5°F).

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Average pressure
Rock Mill, NJ

Average pressure - Rock Mill, 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
Rock Mill, NJ

Average wind speed - Rock Mill, NJ

The windiest month (with the highest average wind speed) is March (8.6mph).
The calmest month (with the lowest average wind speed) is August (5.3mph).

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Average humidity
Rock Mill, NJ

Average humidity - Rock Mill, NJ

Months with the highest relative humidity are February and October (79%).
The month with the lowest relative humidity is April (74%).

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Average rainfall
Rock Mill, NJ

Average rainfall - Rock Mill, 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
Rock Mill, NJ

Average rainfall days - Rock Mill, NJ

The month with the highest number of rainy days is July (12.9 days).
The month with the least rainy days is November (5.5 days).

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Average snowfall
Rock Mill, NJ

Average snowfall - Rock Mill, NJ

The month with the highest snowfall is March (0.75").
Months with the least snowfall are June, July, August, September and October (0").

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Average snowfall days
Rock Mill, NJ

Average snowfall days - Rock Mill, NJ

The month with the highest number of snowfall days is February (4.3 days).
Months with the least snowfall days are June, July, August and September (0 days).

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Average daylight / Average sunshine
Rock Mill, NJ

Average daylight / Average sunshine - Rock Mill, NJ

The month with the longest days is June (Average daylight: 15h).
The month with the shortest days is December (Average daylight: 9.3h).

The month with the most sunshine is July (Average sunshine: 10.6h).
The month with the least sunshine is February (Average sunshine: 4.7h).

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Average sunshine days
Rock Mill, NJ

Average sunshine days - Rock Mill, NJ

The month with the most sunshine days is November (22.7 days).
The month with the least sunshine days is July (13.6 days).

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Average UV index
Rock Mill, NJ

Average UV index - Rock Mill, NJ

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

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Average visibility
Rock Mill, NJ

Average visibility - Rock Mill, NJ

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

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