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
As April gives way to May, the average high-temperature displays an increase, moving from a fresh 53.8°F (12.1°C) to a comfortable 66.9°F (19.4°C). Charleston experiences an average low-temperature reading of 46°F (7.8°C) throughout May.Humidity
In May, the average relative humidity is 79%.Rainfall
In May, in Charleston, the rain falls for 19 days. Throughout May, 2.72" (69mm) of precipitation is accumulated. Throughout the year, in Charleston, there are 175.2 rainfall days, and 30.39" (772mm) of precipitation is accumulated.Snowfall
January through May, October through December are months with snowfall. May is the last month it regularly snows in Charleston. During 0.6 snowfall days, in May, Charleston aggregates 0.35" (9mm) of snow. Throughout the year, in Charleston, there are 80.1 snowfall days, and 36.85" (936mm) of snow is accumulated.Daylight
In Charleston, the average length of the day in May is 14h and 34min.On the first day of May in Charleston, sunrise is at 6:04 am and sunset at 8:07 pm. On the last day of the month, sunrise is at 5:36 am and sunset at 8:36 pm EDT.
Sunshine
In May, the average sunshine is 8.3h.UV index
May through August, with an average maximum UV index of 5, are months with the highest UV index in Charleston. A UV Index of 3 to 5 symbolizes a moderate threat to health from exposure to the Sun's UV radiation for ordinary individuals.Note: The UV index of 5 during May translates into the following guidance:
Be vigilant - A duty to shield skin and eyes from injury exists. UV radiation is strongest from the Sun during midday; protect yourself by staying in shaded areas. A wide-brim hat offers excellent sun protection for the eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Remember to consider! The UV radiation from the Sun can be intensified nearly twice by the reflection of snow.
Frequently asked questions
What is the temperature in May in Charleston?
What is the average humidity in May in Charleston?
How many days does it rain in May in Charleston?
What is the last month it snows in Charleston?
How many hours of daylight does Charleston have in May?
What time are sunrise and sunset in May in Charleston?
How long on average sun shines in May in Charleston?
What is the month with the highest UV index in Charleston?
How high is the UV index in May in Charleston?
Average temperature in May
Charleston, PA
- Average high temperature in May: 66.9°F
The warmest month (with the highest average high temperature) is July (79.3°F).
The month with the lowest average high temperature is January (28.6°F).
- Average low temperature in May: 46°F
The month with the highest average low temperature is July (57.2°F).
The coldest month (with the lowest average low temperature) is January (17.1°F).
Average pressure in May
Charleston, PA
- Average pressure in May: 30"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
Charleston, PA
- Average wind speed in May: 7.1mph
The windiest month (with the highest average wind speed) is January (8.8mph).
The calmest month (with the lowest average wind speed) is August (5.5mph).
Average humidity in May
Charleston, PA
- Average humidity in May: 79%
The month with the highest relative humidity is February (86%).
The month with the lowest relative humidity is June (78%).
Average rainfall in May
Charleston, PA
- Average rainfall in May: 2.72"
The wettest month (with the highest rainfall) is April (3.35").
The driest month (with the least rainfall) is November (1.97").
Average rainfall days in May
Charleston, PA
- Average rainfall days in May: 19 days
The month with the highest number of rainy days is July (19.4 days).
The month with the least rainy days is February (8.5 days).
Average snowfall in May
Charleston, PA
- Average snowfall in May: 0.35"
The month with the highest snowfall is February (9.06").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in May
Charleston, PA
- Average snowfall days in May: 0.6 days
The month with the highest number of snowfall days is January (18.7 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in May /
Average sunshine in May
Charleston, PA
- Average daylight in May: 14h and 4min
The month with the longest days is June (Average daylight: 15h and 12min).
The month with the shortest days is December (Average daylight: 9h and 12min).
- Average sunshine in May: 8h and 2min
The month with the most sunshine is July (Average sunshine: 10h and 0min).
The month with the least sunshine is December (Average sunshine: 3h and 6min).
Average sunshine days in May
Charleston, PA
- Average sunshine days in May: 9.8 days
The month with the most sunshine days is September (14 days).
The month with the least sunshine days is February (7.4 days).
Average UV index in May
Charleston, PA
- Average UV index in May: 5
The months with the highest UV index are May, June, July and August (UV index 5).
The months with the lowest UV index are January and December (UV index 1).
Average cloud cover in May
Charleston, PA
- Average cloud cover in May: 50
The month with the most cloud cover is December (Cloud cover 69).
The months with the least cloud cover are July and August (Cloud cover 39).
Average visibility in May
Charleston, PA
- Average visibility in May: 5mi
The months with the highest visibility are January, March, April, May, June, July, August, September, October, November and December (5mi).
The month with the lowest visibility is February (4mi).
Charleston, Pennsylvania, USA
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