Contents
- Weather in January
- Frequently asked questions
- Average temperature in January
- Average pressure in January
- Average wind speed in January
- Average humidity in January
- Average rainfall in January
- Average rainfall days in January
- Average snowfall in January
- Average snowfall days in January
- Average daylight in January
- Average sunshine in January
- Average sunshine days in January
- Average UV index in January
- Average cloud cover in January
- Average visibility in January
Weather in January
Temperature
Temperature readings reach their annual highs in January, averaging 39.4°F (4.1°C) and a minimum average of 26.4°F (-3.1°C).Humidity
In Potomac, the average relative humidity in January is 73%.Rainfall
In January, the rain falls for 8.1 days. Throughout January, 1.97" (50mm) of precipitation is accumulated. In Potomac, Maryland, during the entire year, the rain falls for 156.5 days and collects up to 30.71" (780mm) of precipitation.Snowfall
Months with snowfall are January through April, November and December. In Potomac, during January, snow falls for 4.2 days and regularly aggregates up to 2.87" (73mm) of snow. In Potomac, during the entire year, snow falls for 15.5 days and aggregates up to 10.24" (260mm) of snow.Daylight
The average length of the day in January is 9h and 48min.On the first day of the month, sunrise is at 7:27 am and sunset at 4:56 pm. On the last day of January, sunrise is at 7:16 am and sunset at 5:28 pm EST.
Sunshine
In January, the average sunshine is 5.1h.UV index
January, February, November and December, with an average maximum UV index of 2, are months with the lowest UV index. A UV Index reading of 2, and below, represents a low threat to health from exposure to the Sun's UV radiation for average individuals.Note: The daily high UV index of 2 during January translates into the following recommendations:
Most people face no serious problems with extended sun exposure, but those with fair skin, infants, and children always need protection. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. Prioritize a wide-brim hat for comprehensive sun defense for your face, neck, eyes, and ears. Consider this! The reflection from snow can almost double the intensity of the Sun's UV radiation.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What part of the year is the coldest?
Is it cold during January?
What is the average humidity in January?
How many days does it rain in January?
How much does it snow in January?
What is the average length of the day in January?
When are sunrise and sunset in January?
How long on average sun shines in January?
When is the lowest UV index in Potomac?
What is the UV index intensity in January?
Average temperature in January
Potomac, MD
- Average high temperature in January: 39.4°F
The warmest month (with the highest average high temperature) is July (87.4°F).
The month with the lowest average high temperature is January (39.4°F).
- Average low temperature in January: 26.4°F
The month with the highest average low temperature is July (68.5°F).
The coldest month (with the lowest average low temperature) is January (26.4°F).
Average pressure in January
Potomac, MD
- Average pressure in January: 30.11"Hg
The month with the highest atmospheric pressure is November (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.95"Hg).
Average wind speed in January
Potomac, MD
- Average wind speed in January: 7.5mph
The windiest month (with the highest average wind speed) is March (7.8mph).
The calmest month (with the lowest average wind speed) is August (4.9mph).
Average humidity in January
Potomac, MD
- Average humidity in January: 73%
The months with the highest relative humidity are October and December (76%).
The month with the lowest relative humidity is July (69%).
Average rainfall in January
Potomac, MD
- Average rainfall in January: 1.97"
The wettest month (with the highest rainfall) is August (3.86").
The driest month (with the least rainfall) is February (1.93").
Average rainfall days in January
Potomac, MD
- Average rainfall days in January: 8.1 days
The month with the highest number of rainy days is August (17.3 days).
The month with the least rainy days is January (8.1 days).
Average snowfall in January
Potomac, MD
- Average snowfall in January: 2.87"
The month with the highest snowfall is March (3.03").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in January
Potomac, MD
- Average snowfall days in January: 4.2 days
The month with the highest number of snowfall days is February (4.8 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average daylight in January /
Average sunshine in January
Potomac, MD
- Average daylight in January: 9h and 5min
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 30min).
- Average sunshine in January: 5h and 1min
The month with the most sunshine is July (Average sunshine: 10h and 48min).
The month with the least sunshine is February (Average sunshine: 5h and 0min).
Average sunshine days in January
Potomac, MD
- Average sunshine days in January: 19.2 days
The month with the most sunshine days is November (19.9 days).
The month with the least sunshine days is May (11.7 days).
Average UV index in January
Potomac, 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
Potomac, MD
- Average cloud cover in January: 45
The month with the most cloud cover is March (Cloud cover 47).
The month with the least cloud cover is July (Cloud cover 31).
Average visibility in January
Potomac, MD
- Average visibility in January: 6mi
The months with the highest visibility are January, February, March, April, June, July, August, September, October, November and December (6mi).
The month with the lowest visibility is May (5mi).
Potomac, Maryland, USA
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