Allentown
Pennsylvania, USA
Long-term weather forecast
Long-term weather forecast

Monthly weather forecast and climate
Allentown, PA

An aerial view of the vast city of Allentown in Pennsylvania, on a hot, sunny day, with the partly cloudy sky and a far view of a clear horizon line
An aerial view of the vast city of Allentown in Pennsylvania, on a hot, sunny day, with the partly cloudy sky and a far view of a clear horizon line
January, the same as December, is another cold winter month in Allentown, Pennsylvania, with average temperature fluctuating between 36°F (2.2°C) and 19.6°F (-6.9°C). With an average high-temperature of 36°F (2.2°C) and an average low-temperature of 19.6°F (-6.9°C), January is the coldest month. Weather in January »
The last month of the winter, February, is another cold month in Allentown, Pennsylvania, with average temperature ranging between min 21.7°F (-5.7°C) and max 39.7°F (4.3°C). In Allentown, the average high-temperature is practically the same as in January - a still cold 39.7°F (4.3°C). Weather in February »

March, the first month of the spring, in Allentown, is a chilly month, with average temperature varying between 49.5°F (9.7°C) and 28.8°F (-1.8°C). In Allentown, Pennsylvania, the average high-temperature increases, from a cold 39.7°F (4.3°C) in February, to a chilly 49.5°F (9.7°C). Weather in March »

April in Allentown, Pennsylvania, is an enjoyable spring month, with average temperature varying between 61.3°F (16.3°C) and 38.5°F (3.6°C). In Allentown, the average high-temperature rises, from a chilly 49.5°F (9.7°C) in March, to a comfortable 61.3°F (16.3°C). Weather in April »

May, the last month of the spring, in Allentown, is an agreeable month, with average temperature fluctuating between 71.4°F (21.9°C) and 48.4°F (9.1°C). In May, the average high-temperature rises, from a comfortable 61.3°F (16.3°C) in April, to a pleasant 71.4°F (21.9°C). Weather in May »

June, the first month of the summer, in Allentown, is a warm month, with average temperature varying between 80.1°F (26.7°C) and 58.1°F (14.5°C). In June, the average high-temperature slightly increases, from a pleasant 71.4°F (21.9°C) in May, to a moderately hot 80.1°F (26.7°C). Weather in June »

July, the same as June, is another warm summer month in Allentown, Pennsylvania, with average temperature ranging between max 84.2°F (29°C) and min 62.8°F (17.1°C). The warmest month is July, with an average high-temperature of 84.2°F (29°C) and an average low-temperature of 62.8°F (17.1°C). Weather in July »

August, the last month of the summer, in Allentown, is also a moderately hot month, with temperature in the range of an average high of 82.4°F (28°C) and an average low of 61°F (16.1°C). In Allentown, Pennsylvania, the average high-temperature in August is essentially the same as in July - a still warm 82.4°F (28°C). Weather in August »

September, the first month of the autumn, in Allentown, is still a warm month, with temperature in the range of an average high of 74.8°F (23.8°C) and an average low of 52.9°F (11.6°C). In September, the average high-temperature slightly decreases, from 82.4°F (28°C) in August, to a still moderately hot 74.8°F (23.8°C). Weather in September »

October, the same as September, is another enjoyable autumn month in Allentown, Pennsylvania, with average temperature fluctuating between 41.4°F (5.2°C) and 63.7°F (17.6°C). In Allentown, the average high-temperature drops, from a warm 74.8°F (23.8°C) in September, to an enjoyable 63.7°F (17.6°C). Weather in October »

November, the last month of the autumn, in Allentown, is also a fresh month, with average temperature ranging between min 32.9°F (0.5°C) and max 52.5°F (11.4°C). In Allentown, the average high-temperature drops, from a comfortable 63.7°F (17.6°C) in October, to a cool 52.5°F (11.4°C). Weather in November »

December, the first month of the winter, in Allentown, is still a cold month, with average temperature fluctuating between 40.5°F (4.7°C) and 24.1°F (-4.4°C). In December, the average high-temperature decreases, from a cool 52.5°F (11.4°C) in November, to a wintry 40.5°F (4.7°C). Weather in December »

What is the coldest month in Allentown?

January is the coldest month in Allentown, Pennsylvania, with an average high-temperature of 36°F (2.2°C) and an average low-temperature of 19.6°F (-6.9°C).

How many days does it rain in Allentown?

In Allentown, Pennsylvania, during the entire year, the rain falls for 126.8 days and collects up to 45.4" (1151.9mm) of precipitation.

When does it snow in Allentown?

January through April, November and December are months with snowfall in Allentown, Pennsylvania.

How much does it snow in Allentown?

Throughout the year, there are 17.4 snowfall days, and 32.9" (835.7mm) of snow is accumulated.

What is the driest month in Allentown?

February is the month with the least rainfall. Rain falls for 9.8 days and accumulates 2.7" (68.6mm) of precipitation.

What is the snowiest month in Allentown?

The month with the most snowfall is February when snow falls for 4.8 days and typically aggregates up to 11.1" (281.9mm) of snow.

What is the least humid month in Allentown?

The least humid month is April, with an average relative humidity of 60.9%.

When are the longest days in Allentown?

The month with the longest days in Allentown is June, with an average of 15h of daylight.

What is the month with the most sunshine in Allentown?

June and July, with an average of 9h of sunshine, are months with the most sunshine in Allentown.

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

June and July, with an average maximum UV index of 9, are months with the highest UV index in Allentown.

What is the warmest month in Allentown?

The warmest month is July, with an average high-temperature of 84.2°F (29°C) and an average low-temperature of 62.8°F (17.1°C).

What is the rainiest month in Allentown?

The month with the most rainfall in Allentown is July when the rain falls for 10.9 days and typically aggregates up to 4.9" (125.7mm) of precipitation.

What is the most humid month in Allentown?

September is the most humid month in Allentown, Pennsylvania, with an average relative humidity of 74%.

What is the month with the least sunshine in Allentown?

Months with the least sunshine in Allentown are November and December, with an average of 4h of sunshine.

What is the month with the shortest days in Allentown?

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

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

The month with the lowest UV index in Allentown, Pennsylvania, is December, with an average maximum UV index of 1.
Average temperature - Allentown, PA
Average humidity - Allentown, PA
Average rainfall - Allentown, PA
Average rainfall days - Allentown, PA

Months with the highest number of rainy days are April and May (12.1 days).
Months with the lowest number of rainy days are September and October (9.1 days).

Average snowfall - Allentown, PA
Average snowfall days - Allentown, PA

The month with the highest number of snowfall days is January (5.6 days).
Months with the lowest number of snowfall days are May, June, July, August, September and October (0 days).

Average daylight / Average sunshine - Allentown, PA