Climate and monthly weather forecast
Allentown, NJ

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Weather in January

January, the same as December, is another cold winter month in Allentown, New Jersey, with an average temperature varying between 37.4°F (3°C) and 25°F (-3.9°C). January is the coldest month, with an average high-temperature of 37.4°F (3°C) and an average low-temperature of 25°F (-3.9°C). Weather in January »

Weather in February

The last month of the winter, February, is also a wintry month in Allentown, New Jersey, with an average temperature ranging between min 27°F (-2.8°C) and max 41.2°F (5.1°C). Stepping into February, Allentown records an average high-temperature of a still cold 41.2°F (5.1°C), almost consistent with January. Weather in February »

Weather in March

March, the first month of the spring in Allentown, is a chilly month, with temperature in the range of an average low of 34.2°F (1.2°C) and an average high of 48.7°F (9.3°C). A soft shift in the average high-temperature is noticeable in March, transitioning from an icy 41.2°F (5.1°C) in February to a chilly 48.7°F (9.3°C). Weather in March »

Weather in April

April is a moderate spring month in Allentown, New Jersey, with an average temperature ranging between max 60.4°F (15.8°C) and min 43.9°F (6.6°C). April's arrival signals an increase in average high-temperatures, moving from March's frosty 48.7°F (9.3°C) to a moderate 60.4°F (15.8°C). Weather in April »

Weather in May

The last month of the spring, May, is a pleasant month in Allentown, New Jersey, with an average temperature varying between 53.4°F (11.9°C) and 70.3°F (21.3°C). Allentown's transition into May is marked by a temperature shift, moving from a mild 60.4°F (15.8°C) in April to an agreeable 70.3°F (21.3°C). Weather in May »

Weather in June

The first month of the summer, June, is a moderately hot month in Allentown, New Jersey, with an average temperature ranging between min 61.3°F (16.3°C) and max 78.4°F (25.8°C). June's onset witnesses a minor shift in the average high-temperature, moving from a pleasant 70.3°F (21.3°C) in May to a warm 78.4°F (25.8°C). Weather in June »

Weather in July

July, the same as June, is a moderately hot summer month in Allentown, New Jersey, with an average temperature fluctuating between 67.6°F (19.8°C) and 84.4°F (29.1°C). The warmest month is July, with an average high-temperature of 84.4°F (29.1°C) and an average low-temperature of 67.6°F (19.8°C). In July, the average heat index is evaluated at a hot 93.2°F (34°C). Weather in July »

Weather in August

August, the last month of the summer in Allentown, is also a moderately hot month, with an average temperature varying between 82.6°F (28.1°C) and 66.2°F (19°C). On the advent of August, Allentown's average high-temperature exhibits a minor adjustment to a still moderately hot 82.6°F (28.1°C) from July's 84.4°F (29.1°C). Weather in August »

Weather in September

The first month of the autumn, September, is still a warm month in Allentown, New Jersey, with an average temperature ranging between max 75.9°F (24.4°C) and min 59.9°F (15.5°C). A mild shift in the average high-temperature occurs in September, reducing from 82.6°F (28.1°C) in August to a still warm 75.9°F (24.4°C). Weather in September »

Weather in October

October, like September, in Allentown, New Jersey, is another enjoyable autumn month, with an average temperature varying between 64.4°F (18°C) and 50°F (10°C). In October, the average high-temperature goes from a warm 75.9°F (24.4°C) in September to a comfortable 64.4°F (18°C). Weather in October »

Weather in November

November, the last month of the autumn in Allentown, is also a fresh month, with an average temperature varying between 38.8°F (3.8°C) and 52.7°F (11.5°C). Allentown's November weather features a mild decline in high-temperatures, reducing from a comfortable 64.4°F (18°C) in October to a cool 52.7°F (11.5°C). Weather in November »

Weather in December

The first month of the winter, December, is also a frosty month in Allentown, New Jersey, with an average temperature fluctuating between 43.7°F (6.5°C) and 32.2°F (0.1°C). December involves a decrease in temperature, down from a cool 52.7°F (11.5°C) in November to a chilly 43.7°F (6.5°C). Weather in December »

Frequently asked questions

What part of the year is the coldest?

The coldest period is January, when temperatures fluctuate between an average high of 37.4°F (3°C) and a low of 25°F (-3.9°C).

How many days does it rain?

Throughout the year, there are 152.9 rainfall days, and 28.78" (731mm) of precipitation is accumulated.

When does it snow?

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

How many days does it snow?

Throughout the year, there are 17.7 snowfall days, and 8.43" (214mm) of snow is accumulated.

What are the months with the lowest UV index?

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

What is the month with the least sunshine?

February has the least sunshine of the year, with an average of 4.8h of sunshine.

When does it snow the most?

The month with the most snowfall is March, when snow falls for 3.6 days and typically aggregates up to 3.11" (79mm) of snow.

When is Daylight Saving Time (DST)?

On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts, and the time zone changes from EST to EDT. Daylight Saving Time ends Sunday, November 3. 2024, at 2:00 am, and the time zone reverts from EDT to EST.

What is the least humid month?

The least humid month in Allentown is April, with an average relative humidity of 73%.

What is the month with the highest UV index in Allentown?

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

When it does not snow?

In Allentown, snow does not fall in June through October.

When are the longest days?

The month with the longest days is June, with an average of 15h and 0min of daylight.

What part of the year is the hottest?

July, with its average high-temperature of 84.4°F (29.1°C) and an average low-temperature of 67.6°F (19.8°C), holds the record as the warmest month.

What is the wettest month?

July is the month with the most rainfall. Rain falls for 17.8 days and accumulates 3.39" (86mm) of precipitation.

What month has the most sunshine?

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

What is the driest month?

September is the month with the least rainfall. Rain falls for 12.7 days and accumulates 1.65" (42mm) of precipitation.

What is the most humid month in Allentown?

October is the most humid month, with an average relative humidity of 79%.

What is the month with the shortest days?

The month with the shortest days is December, with an average of 9h and 24min of daylight.

Average temperature
Allentown, NJ

Average temperature - Allentown, NJ

The warmest month (with the highest average high temperature) is July (84.4°F).
The month with the lowest average high temperature is January (37.4°F).

The month with the highest average low temperature is July (67.6°F).
The coldest month (with the lowest average low temperature) is January (25°F).

Average pressure
Allentown, NJ

Average pressure - Allentown, 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).

Average wind speed
Allentown, NJ

Average wind speed - Allentown, NJ

The windiest month (with the highest average wind speed) is March (8.8mph).
The calmest month (with the lowest average wind speed) is August (5.5mph).

Average humidity
Allentown, NJ

Average humidity - Allentown, NJ

The month with the highest relative humidity is October (79%).
The month with the lowest relative humidity is April (73%).

Average rainfall
Allentown, NJ

Average rainfall - Allentown, NJ

The wettest month (with the highest rainfall) is July (3.39").
The driest month (with the least rainfall) is September (1.65").

Average rainfall days
Allentown, NJ

Average rainfall days - Allentown, NJ

The month with the highest number of rainy days is July (17.8 days).
The month with the least rainy days is January (8.3 days).

Average snowfall
Allentown, NJ

Average snowfall - Allentown, NJ

The month with the highest snowfall is March (3.11").
The months with the least snowfall are June, July, August, September and October (0").

Average snowfall days
Allentown, NJ

Average snowfall days - Allentown, NJ

The month with the highest number of snowfall days is January (5.3 days).
The months with the least snowfall days are June, July, August, September and October (0 days).

Average daylight / Average sunshine
Allentown, NJ

Average daylight / Average sunshine - Allentown, NJ

The month with the longest days is June (Average daylight: 15h and 0min).
The month with the shortest days is December (Average daylight: 9h and 24min).

The month with the most sunshine is July (Average sunshine: 10h and 30min).
The month with the least sunshine is February (Average sunshine: 4h and 48min).

Average sunshine days
Allentown, NJ

Average sunshine days - Allentown, NJ

The month with the most sunshine days is November (19.7 days).
The month with the least sunshine days is July (11 days).

Average UV index
Allentown, NJ

Average UV index - Allentown, NJ

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

Average visibility
Allentown, NJ

Average visibility - Allentown, NJ

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).

Allentown, New Jersey, USA

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