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 sea temperature 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
Charlestown sees an increase in the average high-temperature with the arrival of May, moving from April's refreshing 61.9°F (16.6°C) to an agreeable 71.6°F (22°C). The low-temperature average for Charlestown during May stands at a cool 54.5°F (12.5°C).Humidity
The months with the highest humidity are May and June, with an average relative humidity of 79%.Rainfall
In Charlestown, during May, the rain falls for 17.4 days and regularly aggregates up to 2.68" (68mm) of precipitation. In Charlestown, during the entire year, the rain falls for 150.3 days and collects up to 29.25" (743mm) of precipitation.Snowfall
January through March, May, November and December are months with snowfall. May is the first month it typically snows. Throughout May, in the average 0.1 snowfall days, it receives 0.08" (2mm) of snow. Throughout the year, there are 13.1 snowfall days, and 6.89" (175mm) of snow is accumulated.Ocean temperature
In Charlestown, the average seawater temperature in May is 54°F (12.2°C).Note: Being in 54°F (12.2°C) waters at 55.4°F (13°C) is discomforting, but anything below 50°F (10°C) can jeopardize breathing and induce cold shock, factoring in physical endurance.
Daylight
In Charlestown, the average length of the day in May is 14h and 22min.On the first day of May, sunrise is at 6:03 am and sunset at 7:58 pm. On the last day of the month, sunrise is at 5:38 am and sunset at 8:25 pm EDT.
Sunshine
In Charlestown, the average sunshine in May is 8.6h.UV index
The months with the highest UV index are May through August, with an average maximum UV index of 6. A UV Index estimate of 6 to 7 represents a high health hazard from unprotected exposure to Sun's UV rays for average individuals.Note: In May, the maximum UV index of 6 suggests this advice:
Take precautions and utilize sun safety practices. Protection against skin and eye damage is required. Avoid direct Sun exposure and seek shade from 10 a.m. to 4 p.m., the period of highest UV radiation. Remember, however, that not all shade structures offer full protection. For effective sun eye protection, rely on sunglasses certified for UVA and UVB resistance. Be attentive! The reflective property of snow can nearly double the Sun's UV radiation.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the usual temperature for Charlestown in May?
What is the most humid month?
What is the average humidity in May?
How much does it rain in May?
When does it start snowing?
What is the water temperature in May in Charlestown?
What is the average length of the day in May?
When are sunrise and sunset in May?
How many hours of sunshine does Charlestown have in May?
What are the months with the highest UV index?
How high is the UV index in May?
Average temperature in May
Charlestown, MD
- Average high temperature in May: 71.6°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 (37.9°F).
- Average low temperature in May: 54.5°F
The month with the highest average low temperature is July (67.6°F).
The coldest month (with the lowest average low temperature) is January (26.1°F).
Average pressure in May
Charlestown, MD
- Average pressure in May: 30.01"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 May
Charlestown, MD
- Average wind speed in May: 6.9mph
The windiest months (with the highest average wind speed) are February and March (8.9mph).
The calmest month (with the lowest average wind speed) is August (5.3mph).
Average humidity in May
Charlestown, MD
- Average humidity in May: 79%
The months with the highest relative humidity are May and June (79%).
The month with the lowest relative humidity is April (74%).
Average rainfall in May
Charlestown, MD
- Average rainfall in May: 2.68"
The wettest month (with the highest rainfall) is August (3.86").
The driest month (with the least rainfall) is January (1.85").
Average rainfall days in May
Charlestown, MD
- Average rainfall days in May: 17.4 days
The month with the highest number of rainy days is May (17.4 days).
The month with the least rainy days is January (7.8 days).
Average snowfall in May
Charlestown, MD
- Average snowfall in May: 0.08"
The month with the highest snowfall is January (2.24").
The months with the least snowfall are April, June, July, August, September and October (0").
Average snowfall days in May
Charlestown, MD
- Average snowfall days in May: 0.1 days
The month with the highest number of snowfall days is January (4.4 days).
The months with the least snowfall days are April, June, July, August, September and October (0 days).
Average sea temperature in May
Charlestown, MD
- Average sea temperature in May: 53.9°F
The best month for swimming (with the highest average sea temperature) is August (76.3°F).
The coldest month (with the lowest average sea temperature) is February (40.9°F).
Average daylight in May /
Average sunshine in May
Charlestown, MD
- 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 42min).
The month with the least sunshine is February (Average sunshine: 4h and 54min).
Average sunshine days in May
Charlestown, MD
- Average sunshine days in May: 11.7 days
The month with the most sunshine days is November (20.4 days).
The month with the least sunshine days is July (11.6 days).
Average UV index in May
Charlestown, MD
- Average UV index in May: 6
The months with the highest UV index are May, June, July and August (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover in May
Charlestown, MD
- Average cloud cover in May: 45
The months with the most cloud cover are February and March (Cloud cover 46).
The month with the least cloud cover is July (Cloud cover 31).
Average visibility in May
Charlestown, MD
- Average visibility in May: 5mi
The months with the highest visibility are January, February, March, April, June, July, August, October, November and December (6mi).
The months with the lowest visibility are May and September (5mi).
Charlestown, Maryland, USA
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