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 onset of May, Mercer sees a temperature rise, with the average high-temperature moving from April's refreshing 57°F (13.9°C) to an agreeable 69.4°F (20.8°C). May's nights in Mercer, Pennsylvania, observe an average temperature of 49.1°F (9.5°C).Humidity
April, May and July, with an average relative humidity of 79%, are the least humid months.Rainfall
In Mercer, during May, the rain falls for 20.9 days and regularly aggregates up to 3.7" (94mm) of precipitation. Throughout the year, there are 180.8 rainfall days, and 36.65" (931mm) of precipitation is accumulated.Snowfall
January through May, October through December are months with snowfall. May is the last month it regularly snows in Mercer. During 0.4 snowfall days, in May, Mercer aggregates 0.24" (6mm) of snow. Throughout the year, in Mercer, there are 76.2 snowfall days, and 32.36" (822mm) of snow is accumulated.Daylight
The average length of the day in May is 14h and 31min.On the first day of May in Mercer, Pennsylvania, sunrise is at 6:17 am and sunset at 8:18 pm. On the last day of the month, sunrise is at 5:50 am and sunset at 8:47 pm EDT.
Sunshine
The average sunshine in May is 8.5h.UV index
May through August, with an average maximum UV index of 5, are months with the highest UV index. A UV Index estimate of 3 to 5 represents a moderate health risk from exposure to the Sun's UV radiation for average individuals.Note: The UV index of 5 during May translates into the following guidance:
Undertake protective steps - Preventing sun damage is advised. Stay safe from the Sun's strongest UV rays by limiting exposure during midday. Wearing sunglasses with both UVA and UVB protection effectively reduces sun-induced eye damage. On your guard! Snow's reflection can almost double the intensity of the Sun's UV radiation.
Frequently asked questions
What are the temperatures in Mercer in May?
What is the least humid month in Mercer?
What is the average humidity in May in Mercer?
How much does it rain in Mercer in May?
What is the last month it snows in Mercer?
What is the average length of the day in May in Mercer?
When are sunrise and sunset in May in Mercer?
How many hours of sunshine does Mercer have in May?
When is the highest UV index in Mercer?
How high is the UV index in May in Mercer?
Average temperature in May
Mercer, PA
- Average high temperature in May: 69.4°F
The warmest month (with the highest average high temperature) is July (80.4°F).
The month with the lowest average high temperature is January (30.6°F).
- Average low temperature in May: 49.1°F
The month with the highest average low temperature is July (59.5°F).
The coldest month (with the lowest average low temperature) is January (18.3°F).
Average pressure in May
Mercer, PA
- Average pressure in May: 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 May
Mercer, PA
- Average wind speed in May: 6.5mph
The windiest month (with the highest average wind speed) is January (8.3mph).
The calmest months (with the lowest average wind speed) are July and August (5.2mph).
Average humidity in May
Mercer, PA
- Average humidity in May: 79%
The month with the highest relative humidity is February (89%).
The months with the lowest relative humidity are April, May and July (79%).
Average rainfall in May
Mercer, PA
- Average rainfall in May: 3.7"
The wettest months (with the highest rainfall) are April and June (3.74").
The driest month (with the least rainfall) is November (2.2").
Average rainfall days in May
Mercer, PA
- Average rainfall days in May: 20.9 days
The month with the highest number of rainy days is May (20.9 days).
The month with the least rainy days is January (8.3 days).
Average snowfall in May
Mercer, PA
- Average snowfall in May: 0.24"
The month with the highest snowfall is January (8.27").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in May
Mercer, PA
- Average snowfall days in May: 0.4 days
The month with the highest number of snowfall days is January (19.6 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in May /
Average sunshine in May
Mercer, PA
- Average daylight in May: 14h and 3min
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 May: 8h and 3min
The months with the most sunshine are July and August (Average sunshine: 9h and 54min).
The month with the least sunshine is January (Average sunshine: 2h and 24min).
Average sunshine days in May
Mercer, PA
- Average sunshine days in May: 8.3 days
The month with the most sunshine days is September (14 days).
The month with the least sunshine days is February (6.2 days).
Average UV index in May
Mercer, PA
- Average UV index in May: 5
The months with the highest UV index are May, June, July and August (UV index 5).
The month with the lowest UV index is December (UV index 1).
Average cloud cover in May
Mercer, PA
- Average cloud cover in May: 47
The month with the most cloud cover is January (Cloud cover 75).
The month with the least cloud cover is August (Cloud cover 36).
Average visibility in May
Mercer, PA
- Average visibility in May: 5mi
The months with the highest visibility are March, April, May, June, July, August, September, October and November (5mi).
The months with the lowest visibility are January, February and December (4mi).
Mercer, Pennsylvania, USA
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