Climate and monthly weather forecast
Mountainside, NJ

Weather in January

January, like December, in Mountainside, New Jersey, is a wintry winter month, with an average temperature ranging between max 36°F (2.2°C) and min 23.9°F (-4.5°C). With an average high-temperature of 36°F (2.2°C) and an average low-temperature of 23.9°F (-4.5°C), January is the coldest month. Weather in January »

Weather in February

February, the last month of the winter in Mountainside, is also a wintry month, with temperature in the range of an average low of 25.7°F (-3.5°C) and an average high of 39.2°F (4°C). In February, the average high-temperature is relatively the same as in January - a still cold 39.2°F (4°C). Weather in February »

Weather in March

March, the first month of the spring in Mountainside, is a frosty month, with an average temperature fluctuating between 47.3°F (8.5°C) and 32.9°F (0.5°C). In March, the average high-temperature slightly increases from a cold 39.2°F (4°C) in February to a chilly 47.3°F (8.5°C). Weather in March »

Weather in April

April is a moderate spring month in Mountainside, New Jersey, with an average temperature fluctuating between 43.3°F (6.3°C) and 59°F (15°C). In April, the average high-temperature increases from a frosty 47.3°F (8.5°C) in March to a mild 59°F (15°C). Weather in April »

Weather in May

The last month of the spring, May, is an agreeable month in Mountainside, New Jersey, with an average temperature fluctuating between 52.9°F (11.6°C) and 69.3°F (20.7°C). In Mountainside, the average high-temperature in May increases from a moderate 59°F (15°C) in April to a pleasant 69.3°F (20.7°C). Weather in May »

Weather in June

The first month of the summer, June, is a warm month in Mountainside, New Jersey, with an average temperature varying between 60.6°F (15.9°C) and 77.5°F (25.3°C). In Mountainside, the average high-temperature in June slightly increases from a pleasant 69.3°F (20.7°C) in May to a moderately hot 77.5°F (25.3°C). Weather in June »

Weather in July

July, the same as June, is another warm summer month in Mountainside, New Jersey, with an average temperature varying between 84.2°F (29°C) and 67.5°F (19.7°C). July is the warmest month, with an average high-temperature of 84.2°F (29°C) and an average low-temperature of 67.5°F (19.7°C). The average heat index in July is computed to be a tropical 92.3°F (33.5°C). Weather in July »

Weather in August

The last month of the summer, August, is also a moderately hot month in Mountainside, New Jersey, with temperature in the range of an average high of 82°F (27.8°C) and an average low of 66.2°F (19°C). In August, the average high-temperature is relatively the same as in July - a still warm 82°F (27.8°C). Weather in August »

Weather in September

September, the first month of the autumn in Mountainside, is still a warm month, with an average temperature fluctuating between 59.4°F (15.2°C) and 75.4°F (24.1°C). In Mountainside, the average high-temperature in September slightly decreases from a moderately hot 82°F (27.8°C) in August to a still warm 75.4°F (24.1°C). Weather in September »

Weather in October

October, the same as September, is another comfortable autumn month in Mountainside, New Jersey, with temperature in the range of an average low of 49.1°F (9.5°C) and an average high of 63.1°F (17.3°C). In Mountainside, the average high-temperature in October decreases from a moderately hot 75.4°F (24.1°C) in September to an enjoyable 63.1°F (17.3°C). Weather in October »

Weather in November

November, the last month of the autumn in Mountainside, is another cool month, with an average temperature ranging between max 51.1°F (10.6°C) and min 38.1°F (3.4°C). In November, the average high-temperature drops from a comfortable 63.1°F (17.3°C) in October to a fresh 51.1°F (10.6°C). Weather in November »

Weather in December

The first month of the winter, December, is also a wintry month in Mountainside, New Jersey, with an average temperature varying between 42.3°F (5.7°C) and 31.1°F (-0.5°C). In Mountainside, the average high-temperature in December marginally drops from a cool 51.1°F (10.6°C) in November to a cold 42.3°F (5.7°C). Weather in December »
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FAQ

What is the coldest month in Mountainside?

The coldest month in Mountainside is January, with an average high-temperature of 36°F (2.2°C) and an average low-temperature of 23.9°F (-4.5°C).

How much does it rain in Mountainside?

In Mountainside, New Jersey, during the entire year, the rain falls for 160.7 days and collects up to 30.12" (765mm) of precipitation.

When does it snow in Mountainside?

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

How many days does it snow in Mountainside?

In Mountainside, during the entire year, snow falls for 25.4 days and aggregates up to 10.31" (262mm) of snow.

What is the month with the lowest UV index in Mountainside?

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

What are the most humid months in Mountainside?

The months with the highest humidity in Mountainside, New Jersey, are February, October and December, with an average relative humidity of 78%.

What is the month with the least sunshine in Mountainside?

February has the least sunshine of the year in Mountainside, with an average of 4.6h of sunshine.

What is the snowiest month in Mountainside?

The month with the most snowfall in Mountainside is March, when snow falls for 5 days and typically aggregates up to 3.23" (82mm) of snow.

When is Daylight Saving Time (DST) in Mountainside?

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

April and August, with an average relative humidity of 73%, are the least humid months.

When it does not snow in Mountainside?

June through September are months without snowfall in Mountainside, New Jersey.

When are the longest days in Mountainside?

June has the longest days of the year in Mountainside, with an average of 15h and 2min of daylight.

When is the highest UV index in Mountainside?

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

What is the warmest month in Mountainside?

July is the warmest month, with an average high-temperature of 84.2°F (29°C) and an average low-temperature of 67.5°F (19.7°C).

What month has the most sunshine in Mountainside?

With an average of 10.5h of sunshine, July has the most sunshine of the year in Mountainside.

What is the driest month in Mountainside?

September is the month with the least rainfall. Rain falls for 12.9 days and accumulates 1.69" (43mm) of precipitation.

What is the wettest month in Mountainside?

December is the month with the most rainfall. Rain falls for 11.5 days and accumulates 3.19" (81mm) of precipitation.

What is the month with the shortest days in Mountainside?

The month with the shortest days in Mountainside is December, with an average of 9h and 19min of daylight.

Average temperature
Mountainside, NJ

Average temperature - Mountainside, NJ

The warmest month (with the highest average high temperature) is July (84.2°F).
The month with the lowest average high temperature is January (36°F).

The month with the highest average low temperature is July (67.5°F).
The coldest month (with the lowest average low temperature) is January (23.9°F).

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Average pressure
Mountainside, NJ

Average pressure - Mountainside, NJ

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

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Average wind speed
Mountainside, NJ

Average wind speed - Mountainside, NJ

The windiest month (with the highest average wind speed) is March (8.9mph).
The calmest months (with the lowest average wind speed) are July and August (5.7mph).

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Average humidity
Mountainside, NJ

Average humidity - Mountainside, NJ

The months with the highest relative humidity are February, October and December (78%).
The months with the lowest relative humidity are April and August (73%).

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Average rainfall
Mountainside, NJ

Average rainfall - Mountainside, NJ

The wettest month (with the highest rainfall) is December (3.19").
The driest month (with the least rainfall) is September (1.69").

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Average rainfall days
Mountainside, NJ

Average rainfall days - Mountainside, NJ

The month with the highest number of rainy days is July (16.5 days).
The month with the least rainy days is January (9.5 days).

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Average snowfall
Mountainside, NJ

Average snowfall - Mountainside, NJ

The month with the highest snowfall is March (3.23").
The months with the least snowfall are June, July, August and September (0").

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Average snowfall days
Mountainside, NJ

Average snowfall days - Mountainside, NJ

The months with the highest number of snowfall days are January and February (7.3 days).
The months with the least snowfall days are June, July, August and September (0 days).

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Average daylight / Average sunshine
Mountainside, NJ

Average daylight / Average sunshine - Mountainside, NJ

The month with the longest days is June (Average daylight: 15h and 2min).
The month with the shortest days is December (Average daylight: 9h and 19min).

The month with the most sunshine is July (Average sunshine: 10.5h).
The month with the least sunshine is February (Average sunshine: 4.6h).

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Average sunshine days
Mountainside, NJ

Average sunshine days - Mountainside, NJ

The month with the most sunshine days is November (18.4 days).
The month with the least sunshine days is June (11.4 days).

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Average UV index
Mountainside, NJ

Average UV index - Mountainside, NJ

The months with the highest UV index are June, 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 cloud cover
Mountainside, NJ

Average cloud cover - Mountainside, NJ

The months with the most cloud cover are February, March and December (Cloud cover 48).
The months with the least cloud cover are July and August (Cloud cover 32).

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Average visibility
Mountainside, NJ

Average visibility - Mountainside, NJ

The 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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