Contents
- Weather in April
- Frequently asked questions
- Average temperature in April
- Average pressure in April
- Average wind speed in April
- Average humidity in April
- Average rainfall in April
- Average rainfall days in April
- Average snowfall in April
- Average snowfall days in April
- Average daylight in April
- Average sunshine in April
- Average sunshine days in April
- Average UV index in April
- Average cloud cover in April
- Average visibility in April
Weather in April
Temperature
The onset of April brings a rise in the average high-temperature, elevating from a chilly 45.9°F (7.7°C) in March to a mild 58.3°F (14.6°C). During April, the average low-temperature is an icy 40.5°F (4.7°C).Humidity
April and July, with an average relative humidity of 76%, are the least humid months.Rainfall
In Allentown, in April, during 14.9 rainfall days, 2.44" (62mm) of precipitation is typically accumulated. Throughout the year, there are 145.1 rainfall days, and 27.24" (692mm) of precipitation is accumulated.Snowfall
January through May, October through December are months with snowfall. In Allentown, in April, during 0.3 snowfall days, 0.2" (5mm) of snow is typically accumulated. Throughout the year, there are 20.4 snowfall days, and 13.82" (351mm) of snow is accumulated.Daylight
In April, the average length of the day is 13h and 19min.On the first day of the month, sunrise is at 6:44 am and sunset at 7:27 pm. On the last day of April, sunrise is at 6:00 am and sunset at 7:57 pm EDT.
Sunshine
In April, the average sunshine is 7.9h.UV index
In Allentown, the average daily maximum UV index in April is 4. A UV Index of 3 to 5 symbolizes a medium health hazard from exposure to the Sun's UV rays for the average person.Note: The maximum daily UV index of 4 in April converts into the following recommendations:
Safety measures are advised. Light-skinned individuals may experience burns in under half an hour. Around midday, solar radiation is most harmful; hence, exposure should be limited. Wearing a wide-brim hat can block approximately 50% of UV radiation, protecting the eyes. Stay alert! Snow's reflective properties can almost double the UV radiation from the Sun.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are April temperatures?
What are the least humid months?
What is the average humidity in April?
How many days does it rain in April?
How many days does it snow in April?
How many hours of daylight does Allentown have in April?
When is the sunrise / sunset in April?
How long on average sun shines in April?
How high is the UV index in April?
Average temperature in April
Allentown, PA
- Average high temperature in April: 58.3°F
The warmest month (with the highest average high temperature) is July (83.8°F).
The month with the lowest average high temperature is January (34°F).
- Average low temperature in April: 40.5°F
The month with the highest average low temperature is July (63.5°F).
The coldest month (with the lowest average low temperature) is January (21.6°F).
Average pressure in April
Allentown, PA
- Average pressure in April: 29.99"Hg
The month with the highest atmospheric pressure is November (30.12"Hg).
The month with the lowest atmospheric pressure is June (29.94"Hg).
Average wind speed in April
Allentown, PA
- Average wind speed in April: 7.9mph
The windiest month (with the highest average wind speed) is March (8.1mph).
The calmest month (with the lowest average wind speed) is August (5mph).
Average humidity in April
Allentown, PA
- Average humidity in April: 76%
The month with the highest relative humidity is February (82%).
The months with the lowest relative humidity are April and July (76%).
Average rainfall in April
Allentown, PA
- Average rainfall in April: 2.44"
The wettest month (with the highest rainfall) is July (3.03").
The driest month (with the least rainfall) is September (1.61").
Average rainfall days in April
Allentown, PA
- Average rainfall days in April: 14.9 days
The month with the highest number of rainy days is May (16.9 days).
The month with the least rainy days is January (6.7 days).
Average snowfall in April
Allentown, PA
- Average snowfall in April: 0.2"
The month with the highest snowfall is March (4.37").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in April
Allentown, PA
- Average snowfall days in April: 0.3 days
The month with the highest number of snowfall days is February (6.6 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in April /
Average sunshine in April
Allentown, PA
- Average daylight in April: 13h and 2min
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 18min).
- Average sunshine in April: 7h and 5min
The month with the most sunshine is July (Average sunshine: 10h and 24min).
The month with the least sunshine is February (Average sunshine: 4h and 24min).
Average sunshine days in April
Allentown, PA
- Average sunshine days in April: 13.4 days
The month with the most sunshine days is January (20.5 days).
The month with the least sunshine days is May (11.8 days).
Average UV index in April
Allentown, PA
- Average UV index in April: 4
The months with the highest UV index are June and July (UV index 6).
The months with the lowest UV index are January, February, March, November and December (UV index 2).
Average cloud cover in April
Allentown, PA
- Average cloud cover in April: 47
The month with the most cloud cover is February (Cloud cover 52).
The month with the least cloud cover is July (Cloud cover 34).
Average visibility in April
Allentown, PA
- Average visibility in April: 6mi
The months with the highest visibility are April, July and November (6mi).
The months with the lowest visibility are January, February, March, May, June, August, September, October and December (5mi).
Allentown, Pennsylvania, USA
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