Climate and monthly weather forecastCharlestown, MD
Climate and monthly weather forecast
Weather in January
January, the same as December, is another cold winter month in Charlestown, Maryland, with an average temperature fluctuating between 37.9°F (3.3°C) and 26.1°F (-3.3°C). January stands out as Charlestown's coldest month, with temperatures ranging between an average high of 37.9°F (3.3°C) and a low of 26.1°F (-3.3°C). Weather in January »Weather in February
February, the last month of the winter in Charlestown, is another cold month, with an average temperature ranging between min 28.6°F (-1.9°C) and max 41.7°F (5.4°C). Transitioning from January to February, Charlestown observes an average high-temperature of a still cold 41.7°F (5.4°C), differing subtly from the previous month. Weather in February »Weather in March
The first month of the spring, March, is a fresh month in Charlestown, Maryland, with an average temperature ranging between max 50°F (10°C) and min 35.1°F (1.7°C). Charlestown experiences a minor temperature shift with the start of March, with average high-temperatures moving 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 in Charlestown, Maryland, is a refreshing spring month, with an average temperature fluctuating between 61.9°F (16.6°C) and 45°F (7.2°C). The transition from March to April brings a temperature rise, with average high-temperatures increasing from a cool 50°F (10°C) 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 temperature in the range of an average high of 71.6°F (22°C) and an average low of 54.5°F (12.5°C). 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). Weather in May »Weather in June
The first month of the summer, June, is a warm month in Charlestown, Maryland, with an average temperature fluctuating between 79.5°F (26.4°C) and 62.4°F (16.9°C). In June, the average high-temperature marginally rises from an agreeable 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 an average temperature fluctuating between 84.7°F (29.3°C) and 67.6°F (19.8°C). July, noted for its average high-temperature of 84.7°F (29.3°C) and an average low-temperature of 67.6°F (19.8°C), is considered the warmest month. The heat index value during July is estimated at a torrid 95°F (35°C). Weather in July »Weather in August
August, the last month of the summer in Charlestown, is also a moderately hot month, with an average temperature varying between 82.8°F (28.2°C) and 65.7°F (18.7°C). Charlestown records an average high-temperature of a still warm 82.8°F (28.2°C) in August, maintaining a close correlation with July's 84.7°F (29.3°C). Weather in August »Weather in September
September, the first month of the autumn in Charlestown, is also a moderately hot month, with temperature in the range of an average high of 76.6°F (24.8°C) and an average low of 59.9°F (15.5°C). The shift from August to September includes a minor decrease in the average high-temperature, lightly dropping from 82.8°F (28.2°C) to a still moderately hot 76.6°F (24.8°C). Weather in September »Weather in October
October, the same as September, is another enjoyable autumn month in Charlestown, Maryland, with an average temperature fluctuating between 50.2°F (10.1°C) and 64.9°F (18.3°C). In Charlestown, the average high-temperature in October drops from a moderately hot 76.6°F (24.8°C) in September to a comfortable 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 an average temperature fluctuating between 39.2°F (4°C) and 53.1°F (11.7°C). With the onset of November, Charlestown experiences a modest temperature adjustment, with the average high-temperature receding from an enjoyable 64.9°F (18.3°C) in October to a fresh 53.1°F (11.7°C). Weather in November »Weather in December
December, the first month of the winter in Charlestown, is still a chilly month, with an average temperature varying between 44.1°F (6.7°C) and 33.1°F (0.6°C). Charlestown experiences a moderate temperature shift at the start of December, with average high-temperatures adjusting a bit from a fresh 53.1°F (11.7°C) in November to a chilly 44.1°F (6.7°C). Weather in December »Updated: Jun 4, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
January brings the lowest temperatures, with an average high of 37.9°F (3.3°C) and an average low of 26.1°F (-3.3°C).
The month with the least rainfall is January, when the rain falls for 7.8 days and typically collects 1.85" (47mm) of precipitation.
Throughout the year, there are 150.3 rainfall days, and 29.25" (743mm) of precipitation is accumulated.
Months with snowfall are January through March, May, November and December.
January is the month with the most snowfall. Snow falls for 4.4 days and accumulates 2.24" (57mm) of snow.
In Charlestown, during the entire year, snow falls for 13.1 days and aggregates up to 6.89" (175mm) of snow.
The months with the lowest UV index are January, February, November and December, with an average maximum UV index of 2.
February is the month with the coldest seawater, with an average ocean temperature of 41°F (5°C).
With an average of 4.9h of sunshine, February has the least sunshine of the year.
On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts, and the time zone changes from EST to EDT. Daylight Saving Time ends Sunday, November 3. 2024, at 2:00 am, and the time zone reverts from EDT to EST.
The least humid month is April, with an average relative humidity of 74%.
In Charlestown, snow does not fall in April, June through October.
May and June, with an average relative humidity of 79%, are most humid months.
The months with the highest UV index in Charlestown are May through August, with an average maximum UV index of 6.
The month with the longest days is June, with an average of 14h and 54min of daylight.
Charlestown, Maryland, experiences its highest temperatures in July, with an average peak of 84.7°F (29.3°C) and a low of 67.6°F (19.8°C).
The month with the most sunshine is July, with an average of 10.7h of sunshine.
August is the month with the most rainfall. Rain falls for 15.6 days and accumulates 3.86" (98mm) of precipitation.
The month with the warmest seawater is August, with an average ocean temperature of 76.3°F (24.6°C).
With an average of 9h and 24min of daylight, December has the shortest days of the year.
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).
Average pressure
Charlestown, MD
- Average pressure in January:
30.09"Hg - Average pressure in February:
30.06"Hg - Average pressure in March:
30.07"Hg - Average pressure in April:
29.99"Hg - Average pressure in May:
30.01"Hg - Average pressure in June:
29.94"Hg
- Average pressure in July:
29.96"Hg - Average pressure in August:
29.99"Hg - Average pressure in September:
30.05"Hg - Average pressure in October:
30.03"Hg - Average pressure in November:
30.13"Hg - Average pressure in December:
30.1"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
Charlestown, MD
- Average wind speed in January:
8.8mph - Average wind speed in February:
8.9mph - Average wind speed in March:
8.9mph - Average wind speed in April:
8.8mph - Average wind speed in May:
6.9mph - Average wind speed in June:
6.4mph
- Average wind speed in July:
5.4mph - Average wind speed in August:
5.3mph - Average wind speed in September:
6mph - Average wind speed in October:
7.3mph - Average wind speed in November:
7.7mph - Average wind speed in December:
8.1mph
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
Charlestown, MD
The months with the highest relative humidity are May and June (79%).
The month with the lowest relative humidity is April (74%).
Average rainfall
Charlestown, MD
- Average rainfall in January:
1.85" - Average rainfall in February:
1.89" - Average rainfall in March:
2.17" - Average rainfall in April:
2.17" - Average rainfall in May:
2.68" - Average rainfall in June:
2.6"
- Average rainfall in July:
3.43" - Average rainfall in August:
3.86" - Average rainfall in September:
2.05" - Average rainfall in October:
2.17" - Average rainfall in November:
2.01" - Average rainfall in December:
2.4"
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
Charlestown, MD
- Average rainfall days in January:
7.8 days - Average rainfall days in February:
8.8 days - Average rainfall days in March:
12.3 days - Average rainfall days in April:
14.4 days - Average rainfall days in May:
17.4 days - Average rainfall days in June:
15.3 days
- Average rainfall days in July:
16.4 days - Average rainfall days in August:
15.6 days - Average rainfall days in September:
12.8 days - Average rainfall days in October:
11.6 days - Average rainfall days in November:
8.1 days - Average rainfall days in December:
9.8 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
Charlestown, MD
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
Charlestown, MD
- Average snowfall days in January:
4.4 days - Average snowfall days in February:
3.9 days - Average snowfall days in March:
2.8 days - Average snowfall days in April:
0 days - Average snowfall days in May:
0.1 days - Average snowfall days in June:
0 days
- Average snowfall days in July:
0 days - Average snowfall days in August:
0 days - Average snowfall days in September:
0 days - Average snowfall days in October:
0 days - Average snowfall days in November:
0.2 days - Average snowfall days in December:
1.7 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
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).
Average daylight / Average sunshine
Charlestown, MD
- Average daylight in January:
9h and 48min - Average daylight in February:
10h and 42min - Average daylight in March:
12h and 0min - Average daylight in April:
13h and 18min - Average daylight in May:
14h and 24min - Average daylight in June:
14h and 54min
- Average daylight in July:
14h and 36min - Average daylight in August:
13h and 42min - Average daylight in September:
12h and 24min - Average daylight in October:
11h and 6min - Average daylight in November:
10h and 0min - Average daylight in December:
9h and 24min
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 January:
5h and 6min - Average sunshine in February:
4h and 54min - Average sunshine in March:
6h and 30min - Average sunshine in April:
8h and 30min - Average sunshine in May:
8h and 36min - Average sunshine in June:
10h and 6min
- Average sunshine in July:
10h and 42min - Average sunshine in August:
10h and 12min - Average sunshine in September:
9h and 6min - Average sunshine in October:
5h and 36min - Average sunshine in November:
5h and 48min - Average sunshine in December:
5h and 6min
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
Charlestown, MD
- Average sunshine days in January:
19.3 days - Average sunshine days in February:
15.9 days - Average sunshine days in March:
15.7 days - Average sunshine days in April:
14.3 days - Average sunshine days in May:
11.7 days - Average sunshine days in June:
11.8 days
- Average sunshine days in July:
11.6 days - Average sunshine days in August:
13.2 days - Average sunshine days in September:
15.4 days - Average sunshine days in October:
17.5 days - Average sunshine days in November:
20.4 days - Average sunshine days in December:
18.9 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
Charlestown, MD
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
Charlestown, MD
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
Charlestown, MD
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).
