April weather forecastSouth Williamsport, PA
April
Weather in April
April is a moderate spring month in South Williamsport, Pennsylvania, with temperature in the range of an average low of 37.8°F (3.2°C) and an average high of 56.5°F (13.6°C).Temperature
In South Williamsport, the onset of April comes with an increased average high-temperature, moving from March's frosty 44.2°F (6.8°C) to a moderate 56.5°F (13.6°C). Throughout April, South Williamsport witnesses a nighttime temperature average of 37.8°F (3.2°C).Humidity
April and July, with an average relative humidity of 77%, are the least humid months.Rainfall
April is the month with the most rainfall. Rain falls for 15 days and accumulates 1.93" (49mm) of precipitation.Snowfall
Months with snowfall are January through April, October through December. April is the last month it regularly snows. During 0.9 snowfall days, in April, South Williamsport aggregates 0.16" (4mm) of snow. In South Williamsport, during the entire year, snow falls for 39.1 days and aggregates up to 7.56" (192mm) of snow.Daylight
In April, the average length of the day is 13h and 21min.On the first day of the month, sunrise is at 6:49 am and sunset at 7:33 pm. On the last day of April, sunrise is at 6:05 am and sunset at 8:04 pm EDT.
Sunshine
The average sunshine in April is 7.7h.UV index
In April, the average daily maximum UV index in South Williamsport is 3. A UV Index reading of 3 to 5 represents a medium vulnerability from exposure to the Sun's UV radiation for ordinary individuals.Note: A maximum high UV index of 3 in April translates into the following recommendations:
Exercise prevention - Warding off sunburn is urged. Avoid the Sun's strongest UV rays by seeking shade and limiting exposure during midday. To mitigate harm from sun exposure, pick sunglasses offering UVA and UVB defense. Note this! The Sun's UV radiation can nearly be doubled by the reflection off snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in April
South Williamsport, PA
- Average high temperature in April: 56.5°F
The warmest month (with the highest average high temperature) is July (81.7°F).
The month with the lowest average high temperature is January (30.6°F).
- Average low temperature in April: 37.8°F
The month with the highest average low temperature is July (59.2°F).
The coldest month (with the lowest average low temperature) is January (18.9°F).
Average pressure in April
South Williamsport, PA
- Average pressure in April: 29.98"Hg
The month with the highest atmospheric pressure is November (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.94"Hg).
Average wind speed in April
South Williamsport, PA
- Average wind speed in April: 7.5mph
The windiest months (with the highest average wind speed) are January, March and April (7.5mph).
The calmest month (with the lowest average wind speed) is August (4.8mph).
Average humidity in April
South Williamsport, PA
- Average humidity in April: 77%
The month with the highest relative humidity is February (84%).
The months with the lowest relative humidity are April and July (77%).
Average rainfall in April
South Williamsport, PA
- Average rainfall in April: 1.93"
The wettest month (with the highest rainfall) is April (1.93").
The driest month (with the least rainfall) is November (0.94").
Average rainfall days in April
South Williamsport, PA
- Average rainfall days in April: 15 days
The month with the highest number of rainy days is May (16.6 days).
The month with the least rainy days is February (7.5 days).
Average snowfall in April
South Williamsport, PA
- Average snowfall in April: 0.16"
The month with the highest snowfall is February (2.28").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in April
South Williamsport, PA
- Average snowfall days in April: 0.9 days
The month with the highest number of snowfall days is January (11.8 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in April /
Average sunshine in April
South Williamsport, PA
- Average daylight in April: 13h and 18min
The month with the longest days is June (Average daylight: 15h and 6min).
The month with the shortest days is December (Average daylight: 9h and 18min).
- Average sunshine in April: 7h and 42min
The month with the most sunshine is July (Average sunshine: 10h and 6min).
The months with the least sunshine are January and February (Average sunshine: 3h and 42min).
Average sunshine days in April
South Williamsport, PA
- Average sunshine days in April: 12.9 days
The month with the most sunshine days is November (18.7 days).
The month with the least sunshine days is May (11.8 days).
Average UV index in April
South Williamsport, PA
- Average UV index in April: 3
The month with the highest UV index is July (UV index 6).
The months with the lowest UV index are January, February, March, October, November and December (UV index 2).
Average cloud cover in April
South Williamsport, PA
- Average cloud cover in April: 50
The months with the most cloud cover are January and February (Cloud cover 60).
The month with the least cloud cover is July (Cloud cover 35).
Average visibility in April
South Williamsport, PA
- Average visibility in April: 6mi
The month with the highest visibility is April (6mi).
The month with the lowest visibility is September (4mi).
