May weather forecast
Charlestown, MD

Weather in May

The last month of the spring, May, is an agreeable month in Charlestown, Maryland, with average temperature fluctuating between 54.5°F (12.5°C) and 71.6°F (22°C).

Temperature

In May, the average high-temperature increases, from a comfortable 61.9°F (16.6°C) in April, to a pleasant 71.6°F (22°C). The average low-temperature, in Charlestown, Maryland, is 54.5°F (12.5°C).

Humidity

May and June, with an average relative humidity of 79%, are most humid months in Charlestown.

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 in Charlestown. 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, in Charlestown, there are 13.1 snowfall days, and 6.89" (175mm) of snow is accumulated.

Ocean temperature

In Charlestown, the average water temperature is 54°F (12.2°C).
Note: Swimming in 54°F (12.2°C) is considered life-threatening. Even a few minutes in 55.4°F (13°C) water is uncomfortable, and swimming below 50°F (10°C) may cause total loss of breathing control and cold shock, depending on a person's physique.

Daylight

In May, the average length of the day in Charlestown is 14.4h.

Sunshine

In Charlestown, the average sunshine is 8.6h.

UV index

Months with the highest UV index in Charlestown are May through August, with an average maximum UV index of 6. A UV Index of 6 to 7 symbolizes a high health hazard from the exposure to the Sun's UV radiation for average individuals.
Note: The average daily UV index of 6 in May transform into the following instructions:
Take precautions and adopt sun safety practices. Protection against sunburn is obliged. Seek shade and minimize exposure to direct Sun in a period between 10 a.m. and 4 p.m. when UV radiation is most intense; keep in mind that shade structures like parasols or canopies do not provide perfect sun protection. A wide-brim hat offers excellent sun protection for eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun. Beware! The strength of the UV rays is increased nearly double-fold by the reflection of the snow.
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FAQ

What is the most humid month in Charlestown?

May and June, with an average relative humidity of 79%, are most humid months in Charlestown, Maryland.

What is the average humidity in May in Charlestown?

In Charlestown, the average relative humidity in May is 79%.

How much does it rain in Charlestown in May?

In Charlestown, Maryland, during May, the rain falls for 17.4 days and regularly aggregates up to 2.68" (68mm) of precipitation.

When does it start to snow in Charlestown?

May is the first month it typically snows in Charlestown, Maryland. Throughout May, in the average 0.1 snowfall days, it receives 0.08" (2mm) of snow.

What is the ocean temperature in May in Charlestown?

In May, the average ocean temperature is 54°F (12.2°C). At temperatures below 50°F (10°C), swimming in a suitably protected swimsuit is feasible; otherwise, cold shock and loss of breathing control are imminent. Even a short swim, without thermal protection, at temperatures around 55.4°F (13°C) is not comfortable.

What is the average length of the day in May in Charlestown?

In Charlestown, Maryland, the average length of the day in May is 14.4h.

How long on average sun shines in May in Charlestown?

In Charlestown, the average sunshine in May is 8.6h.

What are the months with the highest UV index in Charlestown?

May through August, with an average maximum UV index of 6, are months with the highest UV index.

What is the UV index intensity in May in Charlestown?

The average daily maximum UV index in May in Charlestown is 6. A UV Index reading of 6 to 7 represents a high health threat from unprotected exposure to the UV radiation.

Average temperature in May
Charlestown, MD

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).

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Average pressure in May
Charlestown, MD

Average pressure in May - Charlestown, MD
  • Average pressure in May: 30.01"

The month with the highest atmospheric pressure is November (30.13").
The month with the lowest atmospheric pressure is June (29.94").

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Average wind speed in May
Charlestown, MD

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).

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Average humidity in May
Charlestown, MD

Average humidity in May - Charlestown, MD
  • Average humidity in May: 79%

Months with the highest relative humidity are May and June (79%).
The month with the lowest relative humidity is April (74%).

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Average rainfall in May
Charlestown, MD

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").

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Average rainfall days in May
Charlestown, MD

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).

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Average snowfall in May
Charlestown, MD

Average snowfall in May - Charlestown, MD
  • Average snowfall in May: 0.08"

The month with the highest snowfall is January (2.24").
Months with the least snowfall are April, June, July, August, September and October (0").

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Average snowfall days in May
Charlestown, MD

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).
Months with the least snowfall days are April, June, July, August, September and October (0 days).

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Average sea temperature in May
Charlestown, MD

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).

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Average daylight in May /
Average sunshine in May
Charlestown, MD

Average daylight in May / Average sunshine in May - Charlestown, MD
  • Average daylight in May: 14.4h

The month with the longest days is June (Average daylight: 14.9h).
The month with the shortest days is December (Average daylight: 9.4h).

  • Average sunshine in May: 8.6h

The month with the most sunshine is July (Average sunshine: 10.7h).
The month with the least sunshine is February (Average sunshine: 4.9h).

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Average sunshine days in May
Charlestown, MD

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).

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Average UV index in May
Charlestown, MD

Average UV index in May - Charlestown, MD
  • Average UV index in May: 6

Months with the highest UV index are May, June, July and August (UV index 6).
Months with the lowest UV index are January, February, November and December (UV index 2).

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Average cloud cover in May
Charlestown, MD

Average cloud cover in May - Charlestown, MD
  • Average cloud cover in May: 45

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).

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Average visibility in May
Charlestown, MD

Average visibility in May - Charlestown, MD
  • Average visibility in May: 5mi

Months with the highest visibility are January, February, March, April, June, July, August, October, November and December (6mi).
Months with the lowest visibility are May and September (5mi).

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