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
Noticing a change, the average high-temperature during April moves from March's frosty 48.6°F (9.2°C) to a comfortable 61.2°F (16.2°C). During April, the average low-temperature is a cold 41.5°F (5.3°C).Humidity
The months with the lowest humidity are April and July, with an average relative humidity of 75%.Rainfall
In Mercersburg, in April, during 16.7 rainfall days, 2.99" (76mm) of precipitation is typically accumulated. Throughout the year, there are 170.5 rainfall days, and 31.02" (788mm) of precipitation is accumulated.Snowfall
January through April, October through December are months with snowfall in Mercersburg. April is the last month it regularly snows. During 1.3 snowfall days, in April, Mercersburg aggregates 0.51" (13mm) of snow. In Mercersburg, during the entire year, snow falls for 33.6 days and aggregates up to 17.91" (455mm) of snow.Daylight
In April, the average length of the day is 13h and 17min.On the first day of April, sunrise is at 6:54 am and sunset at 7:36 pm. On the last day of the month, sunrise is at 6:12 am and sunset at 8:05 pm EDT.
Sunshine
In April, the average sunshine is 8.4h.UV index
In April, the average daily maximum UV index is 3. A UV Index value of 3 to 5 symbolizes a moderate health risk from unprotected exposure to Sun's UV rays for the ordinary person.Note: In April, the UV index of 3 transforms into the following advice:
Proceed with care. Light skin individuals may be exposed to burns in fewer than 30 minutes. Avoiding direct sun during mid-day hours can prevent harmful UV radiation exposure. Select sunglasses that boast both UVA and UVB protection to limit the adverse effects of the sun on the eyes. Watch out! The Sun's UV radiation can be nearly magnified twofold due to snow reflection.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are April temperatures?
What is the least humid month?
What is the average humidity in April?
How much does it rain in April?
What is the last month it snows?
How many hours of daylight does Mercersburg have in April?
What time are sunrise and sunset in April?
How long on average sun shines in April?
How high is the UV index in April?
Average temperature in April
Mercersburg, PA
- Average high temperature in April: 61.2°F
The warmest month (with the highest average high temperature) is July (84.7°F).
The month with the lowest average high temperature is January (35.2°F).
- Average low temperature in April: 41.5°F
The month with the highest average low temperature is July (62.6°F).
The coldest month (with the lowest average low temperature) is January (22.1°F).
Average pressure in April
Mercersburg, PA
- Average pressure in April: 29.98"Hg
The month with the highest atmospheric pressure is November (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.95"Hg).
Average wind speed in April
Mercersburg, PA
- Average wind speed in April: 7.3mph
The windiest month (with the highest average wind speed) is January (7.5mph).
The calmest month (with the lowest average wind speed) is August (4.3mph).
Average humidity in April
Mercersburg, PA
- Average humidity in April: 75%
The months with the highest relative humidity are February, May, October and December (79%).
The months with the lowest relative humidity are April and July (75%).
Average rainfall in April
Mercersburg, PA
- Average rainfall in April: 2.99"
The wettest month (with the highest rainfall) is May (3.19").
The driest month (with the least rainfall) is September (2.05").
Average rainfall days in April
Mercersburg, PA
- Average rainfall days in April: 16.7 days
The month with the highest number of rainy days is May (18.8 days).
The month with the least rainy days is November (9.9 days).
Average snowfall in April
Mercersburg, PA
- Average snowfall in April: 0.51"
The month with the highest snowfall is January (5.2").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in April
Mercersburg, PA
- Average snowfall days in April: 1.3 days
The month with the highest number of snowfall days is January (9.9 days).
The months with the least snowfall days are May, June, July, August and September (0 days).
Average daylight in April /
Average sunshine in April
Mercersburg, PA
- Average daylight in April: 13h and 2min
The month with the longest days is June (Average daylight: 14h and 54min).
The month with the shortest days is December (Average daylight: 9h and 24min).
- Average sunshine in April: 8h and 2min
The month with the most sunshine is July (Average sunshine: 10h and 30min).
The month with the least sunshine is January (Average sunshine: 4h and 36min).
Average sunshine days in April
Mercersburg, PA
- Average sunshine days in April: 11 days
The month with the most sunshine days is November (18 days).
The month with the least sunshine days is May (10.3 days).
Average UV index in April
Mercersburg, PA
- Average UV index in April: 3
The months with the highest UV index are May, 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
Mercersburg, PA
- Average cloud cover in April: 45
The months with the most cloud cover are January, February and December (Cloud cover 50).
The month with the least cloud cover is July (Cloud cover 31).
Average visibility in April
Mercersburg, PA
- Average visibility in April: 6mi
The months with the highest visibility are April, June, July and November (6mi).
The months with the lowest visibility are January, February, March, May, August, September, October and December (5mi).
Mercersburg, Pennsylvania, USA
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