Contents
- Weather in May
- Frequently asked questions
- Average temperature in May
- Average pressure in May
- Average wind speed in May
- Average humidity in May
- Average rainfall in May
- Average rainfall days in May
- Average snowfall in May
- Average snowfall days in May
- Average daylight in May
- Average sunshine in May
- Average sunshine days in May
- Average UV index in May
- Average cloud cover in May
- Average visibility in May
Weather in May
Temperature
With the beginning of May, Mercersburg's average high-temperature sees an increase, transitioning from a comfortable 61.2°F (16.2°C) in April to an agreeable 71.2°F (21.8°C). Mercersburg's average low-temperature is measured at a cool 51.4°F (10.8°C) during May.Humidity
February, May, October and December, with an average relative humidity of 79%, are the most humid months.Rainfall
May is the month with the most rainfall in Mercersburg. Rain falls for 18.8 days and accumulates 3.19" (81mm) of precipitation.Snowfall
May through September are months without snowfall in Mercersburg.Daylight
The average length of the day in May in Mercersburg is 14h and 23min.On the first day of the month, sunrise is at 6:10 am and sunset at 8:06 pm. On the last day of May, sunrise is at 5:45 am and sunset at 8:33 pm EDT.
Sunshine
In Mercersburg, the average sunshine in May is 8.7h.UV index
May through July, with an average maximum UV index of 6, are months with the highest UV index. A UV Index estimate of 6 to 7 represents a high threat to health from unprotected exposure to Sun's UV rays for the ordinary person.Note: A daily high UV index of 6 in May leads to these guidelines:
Shun overexposure. Protection from sun ravages is indispensable. Make an effort to avoid direct sun exposure between 10 a.m. and 4 p.m., the peak period for UV radiation, and note that objects like parasols or canopies might not offer full sun protection. Opt for tightly woven and loose clothing to enhance protection from the Sun.
Frequently asked questions
What is the average May temperature in Mercersburg?
What is the most humid month in Mercersburg?
What is the average humidity in May in Mercersburg?
What is the wettest month in Mercersburg?
How much does it rain in Mercersburg in May?
When it does not snow in Mercersburg?
Does it snow in Mercersburg in May?
What is the average length of the day in May in Mercersburg?
When are sunrise and sunset in May in Mercersburg?
How long on average sun shines in May in Mercersburg?
What is the month with the highest UV index in Mercersburg?
What is the UV index intensity in May in Mercersburg?
Average temperature in May
Mercersburg, PA
- Average high temperature in May: 71.2°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 May: 51.4°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 May
Mercersburg, PA
- Average pressure in May: 30.01"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 May
Mercersburg, PA
- Average wind speed in May: 5.7mph
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 May
Mercersburg, PA
- Average humidity in May: 79%
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 May
Mercersburg, PA
- Average rainfall in May: 3.19"
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 May
Mercersburg, PA
- Average rainfall days in May: 18.8 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 May
Mercersburg, PA
- Average snowfall in May: 0"
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 May
Mercersburg, PA
- Average snowfall days in May: 0 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 May /
Average sunshine in May
Mercersburg, PA
- Average daylight in May: 14h 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 May: 8h and 4min
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 May
Mercersburg, PA
- Average sunshine days in May: 10.3 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 May
Mercersburg, PA
- Average UV index in May: 6
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 May
Mercersburg, PA
- Average cloud cover in May: 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 May
Mercersburg, PA
- Average visibility in May: 5mi
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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