Climate and monthly weather forecast
Charlestown, MD

Weather in January

January, the same as December, is a wintry winter month in Charlestown, Maryland, with average temperature fluctuating between 37.9°F (3.3°C) and 26.1°F (-3.3°C). With an average high-temperature of 37.9°F (3.3°C) and an average low-temperature of 26.1°F (-3.3°C), January is the coldest month. Weather in January »

Weather in February

February, the last month of the winter, in Charlestown, is another cold month, with average temperature fluctuating between 41.7°F (5.4°C) and 28.6°F (-1.9°C). In Charlestown, the average high-temperature in February is relatively the same as in January - a still wintry 41.7°F (5.4°C). Weather in February »

Weather in March

March, the first month of the spring, in Charlestown, is a cool month, with average temperature fluctuating between 50°F (10°C) and 35.1°F (1.7°C). In Charlestown, the average high-temperature marginally rises, from a cold 41.7°F (5.4°C) in February, to a cool 50°F (10°C). Weather in March »

Weather in April

April is a comfortable spring month in Charlestown, Maryland, with average temperature varying between 61.9°F (16.6°C) and 45°F (7.2°C). In Charlestown, the average high-temperature in April increases, from a cool 50°F (10°C) in March, to an enjoyable 61.9°F (16.6°C). Weather in April »

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). 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). Weather in May »

Weather in June

The first month of the summer, June, is a warm month in Charlestown, Maryland, with average temperature ranging between min 62.4°F (16.9°C) and max 79.5°F (26.4°C). In June, the average high-temperature slightly increases, from a pleasant 71.6°F (22°C) in May, to a moderately hot 79.5°F (26.4°C). Weather in June »

Weather in July

July, the same as June, is a moderately hot summer month in Charlestown, Maryland, with average temperature fluctuating between 67.6°F (19.8°C) and 84.7°F (29.3°C). The warmest month is July, with an average high-temperature of 84.7°F (29.3°C) and an average low-temperature of 67.6°F (19.8°C). The average heat index in July is computed to be a tropical 94.8°F (34.9°C). Weather in July »

Weather in August

August, the last month of the summer, in Charlestown, is another warm month, with average temperature varying between 82.8°F (28.2°C) and 65.7°F (18.7°C). In August, the average high-temperature is almost the same as in July - a still moderately hot 82.8°F (28.2°C). Weather in August »

Weather in September

September, the first month of the autumn, in Charlestown, is still a warm month, with average temperature varying between 76.6°F (24.8°C) and 59.9°F (15.5°C). In Charlestown, the average high-temperature in September marginally drops, from 82.8°F (28.2°C) in August, to a still moderately hot 76.6°F (24.8°C). Weather in September »

Weather in October

October, like September, in Charlestown, Maryland, is another comfortable autumn month, with average temperature fluctuating between 64.9°F (18.3°C) and 50.2°F (10.1°C). In Charlestown, the average high-temperature decreases, from a warm 76.6°F (24.8°C) in September, to an enjoyable 64.9°F (18.3°C). Weather in October »

Weather in November

The last month of the autumn, November, is also a fresh month in Charlestown, Maryland, with average temperature varying between 39.2°F (4°C) and 53.1°F (11.7°C). In Charlestown, the average high-temperature decreases, from a comfortable 64.9°F (18.3°C) in October, to a fresh 53.1°F (11.7°C). Weather in November »

Weather in December

The first month of the winter, December, is still a chilly month in Charlestown, Maryland, with average temperature ranging between min 33.1°F (0.6°C) and max 44.1°F (6.7°C). In December, the average high-temperature slightly decreases, from a fresh 53.1°F (11.7°C) in November, to a chilly 44.1°F (6.7°C). Weather in December »
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FAQ

What is the coldest month in Charlestown?

With an average high-temperature of 37.9°F (3.3°C) and an average low-temperature of 26.1°F (-3.3°C), January is the coldest month in Charlestown, Maryland.

What is the driest month in Charlestown?

The month with the least rainfall is January when the rain falls for 7.8 days and typically collects 1.85" (47mm) of precipitation.

How much does it rain in Charlestown?

In Charlestown, during the entire year, the rain falls for 150.3 days and collects up to 29.25" (743mm) of precipitation.

When does it snow in Charlestown?

January through March, May, November and December are months with snowfall in Charlestown.

When does it snow the most in Charlestown?

January is the month with the most snowfall in Charlestown. Snow falls for 4.4 days and accumulates 2.24" (57mm) of snow.

How many days does it snow in Charlestown?

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

What is the month with the lowest UV index in Charlestown?

Months with the lowest UV index are January, February, November and December, with an average maximum UV index of 2.

What month is the ocean coldest in Charlestown?

With an average ocean temperature of 41°F (5°C), February is the month with the coldest seawater in Charlestown, Maryland.

What is the month with the least sunshine in Charlestown?

With an average of 4.9h of sunshine, February has the least sunshine of the year in Charlestown.

What is the least humid month in Charlestown?

With an average relative humidity of 74%, April is the least humid month in Charlestown.

When it does not snow in Charlestown?

In Charlestown, Maryland, snow does not fall in April, June through October.

What is the most humid month in Charlestown?

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

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.

When are the longest days in Charlestown?

June has the longest days of the year, with an average of 14.9h of daylight.

What is the warmest month in Charlestown?

The warmest month is July, with an average high-temperature of 84.7°F (29.3°C) and an average low-temperature of 67.6°F (19.8°C).

What month has the most sunshine in Charlestown?

July has the most sunshine of the year in Charlestown, with an average of 10.7h of sunshine.

What is the rainiest month in Charlestown?

The month with the most rainfall in Charlestown, Maryland, is August when the rain falls for 15.6 days and typically aggregates up to 3.86" (98mm) of precipitation.

When is the ocean warmest in Charlestown?

August is the month with the warmest seawater in Charlestown, Maryland, with an average ocean temperature of 76.3°F (24.6°C).

What is the month with the shortest days in Charlestown?

With an average of 9.4h of daylight, December has the shortest days of the year in Charlestown, Maryland.

Average temperature
Charlestown, MD

Average temperature - Charlestown, MD

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).

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
Charlestown, MD

Average pressure - Charlestown, MD

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
Charlestown, MD

Average wind speed - Charlestown, MD

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
Charlestown, MD

Average humidity - Charlestown, MD

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
Charlestown, MD

Average rainfall - Charlestown, MD

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
Charlestown, MD

Average rainfall days - Charlestown, MD

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
Charlestown, MD

Average snowfall - Charlestown, MD

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
Charlestown, MD

Average snowfall days - Charlestown, MD

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
Charlestown, MD

Average sea temperature - Charlestown, MD

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 / Average sunshine
Charlestown, MD

Average daylight / Average sunshine - Charlestown, MD

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

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
Charlestown, MD

Average sunshine days - Charlestown, MD

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
Charlestown, MD

Average UV index - Charlestown, MD

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 visibility
Charlestown, MD

Average visibility - Charlestown, MD

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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