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

April 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
April is an enjoyable spring month in Allentown, Pennsylvania, with temperature in the range of an average low of 38.5°F (3.6°C) and an average high of 61.3°F (16.3°C).

Temperature

In April, the average high-temperature rises, from a chilly 49.5°F (9.7°C) in March, to an enjoyable 61.3°F (16.3°C). The average low-temperature, in Allentown, is 38.5°F (3.6°C).

Humidity

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

Rainfall

In Allentown, during April, the rain falls for 12.1 days and regularly aggregates up to 3.6" (90.4mm) of precipitation. Throughout the year, in Allentown, there are 126.8 rainfall days, and 45.4" (1151.9mm) of precipitation is accumulated.

Snowfall

January through April, November and December are months with snowfall in Allentown. April is the last month it regularly snows. During 0.4 snowfall days, in April, Allentown aggregates 1" (25.4mm) of snow. Throughout the year, in Allentown, there are 17.4 snowfall days, and 32.9" (835.7mm) of snow is accumulated.

Daylight

In April, the average length of the day is 13.3h.

Sunshine

The average sunshine in April is 7h.

UV index

The average daily maximum UV index in April is 6. A UV Index estimate of 6 to 7 represents a high health risk from the exposure to the Sun's UV rays for the ordinary person.
Note: In April, the average maximum UV index of 6 translate into the following recommendations:
Take precautions and utilize sun safety practices. Protection against the skin and eye damage is required. The Sun's UV radiation is most powerful between 10 a.m. and 4 p.m. To the extent possible, limit exposure to the direct sun during these hours. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes. Beware! The strength of the UV rays is increased nearly double-fold by the reflection of the snow.

What is the temperature in April in Allentown?

The average high-temperature, in April, is 61.3°F (16.3°C), while the average low-temperature is 38.5°F (3.6°C).

What is the least humid month in Allentown?

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

What is the average humidity in April in Allentown?

In April, the average relative humidity in Allentown, Pennsylvania, is 60.9%.

How many days does it rain in April in Allentown?

In Allentown, in April, it is raining for 12.1 days, with typically 3.6" (90.4mm) of accumulated precipitation.

What is the last month it snows in Allentown?

April is the last month it regularly snows. During 0.4 snowfall days, in April, Allentown aggregates 1" (25.4mm) of snow.

What is the average length of the day in April in Allentown?

In April, the average length of the day in Allentown is 13.3h.

How long on average sun shines in April in Allentown?

In Allentown, Pennsylvania, the average sunshine in April is 7h.

How high is the UV index in April in Allentown?

In April, the average daily maximum UV index in Allentown, Pennsylvania, is 6. A UV Index estimate of 6 to 7 represents a high hazard to health from the exposure to the Sun's UV radiation.
Average temperature in April - Allentown, PA
  • Average high temperature in April: 61.3°F

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).

  • Average low temperature in April: 38.5°F

The month with the highest average low temperature is July (62.7°F).
The coldest month (with the lowest average low temperature) is January (19.5°F).

Average humidity in April - Allentown, PA
  • Average humidity in April: 60.9%

The month with the highest relative humidity is September (74%).
The month with the lowest relative humidity is April (60.9%).

Average rainfall in April - Allentown, PA
  • Average rainfall in April: 3.6"

The wettest month (with the highest rainfall) is July (5").
The driest month (with the lowest rainfall) is February (2.7").

Average rainfall days in April - Allentown, PA
  • Average rainfall days in April: 12.1 days

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 in April - Allentown, PA
  • Average snowfall in April: 1"

The month with the highest snowfall is February (11.1").
Months with the lowest snowfall are May, June, July, August, September and October (0").

Average snowfall days in April - Allentown, PA
  • Average snowfall days in April: 0.4 days

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 in April / Average sunshine in April - Allentown, PA
  • Average daylight in April: 13.3h

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

  • Average sunshine in April: 7h

Months with most sunshine are June and July (Average sunshine: 9h).
Months with least sunshine are November and December (Average sunshine: 4).

Average UV index in April - Allentown, PA
  • Average UV index in April: 6

Months with the highest UV index are June and July (UV index 9).
The month with the lowest UV index is December (UV index 1).