January weather forecastCharlestown, MD
January
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).Temperature
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).Humidity
The average relative humidity in January is 75%.Rainfall
January is the month with the least rainfall. Rain falls for 7.8 days and accumulates 1.85" (47mm) of precipitation.Snowfall
January through March, May, November and December are months with snowfall. January is the month with the most snowfall. Snow falls for 4.4 days and accumulates 2.24" (57mm) of snow.Ocean temperature
In Charlestown, in January, the average water temperature is 42.4°F (5.8°C).Note: Swimming in 42.4°F (5.8°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
The average length of the day in January is 9h and 45min.On the first day of January, sunrise is at 7:24 am and sunset at 4:50 pm. On the last day of the month, sunrise is at 7:12 am and sunset at 5:22 pm EST.
Sunshine
In January, the average sunshine in Charlestown is 5.1h.UV index
The months with the lowest UV index are January, February, November and December, with an average maximum UV index of 2. A UV Index reading of 2, and below, represents a low threat to health from unsafe exposure to UV radiation for the ordinary person.Note: In January, a regular UV index of 2 translates into these guidelines:
Unlike children, who always need sun protection, most individuals can remain in the sun for up to an hour without getting burnt. UV radiation from the Sun is most dangerous during midday; take precautions and seek shade. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes. Take careful note! The UV radiation of the Sun can be nearly doubled by snow reflection.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in January
Charlestown, MD
- Average high temperature in January: 37.9°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 January: 26.1°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 January
Charlestown, MD
- Average pressure in January: 30.09"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 January
Charlestown, MD
- Average wind speed in January: 8.8mph
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 January
Charlestown, MD
- Average humidity in January: 75%
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 January
Charlestown, MD
- Average rainfall in January: 1.85"
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 January
Charlestown, MD
- Average rainfall days in January: 7.8 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 in January
Charlestown, MD
- Average snowfall in January: 2.24"
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 January
Charlestown, MD
- Average snowfall days in January: 4.4 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 January
Charlestown, MD
- Average sea temperature in January: 42.4°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 January /
Average sunshine in January
Charlestown, MD
- Average daylight in January: 9h and 48min
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
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 January
Charlestown, MD
- Average sunshine days in January: 19.3 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 January
Charlestown, MD
- Average UV index in January: 2
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 January
Charlestown, MD
- Average cloud cover in January: 44
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 January
Charlestown, MD
- Average visibility in January: 6mi
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).
