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
Rockville's coldest month, January, registers temperatures that range from a high of 39°F (3.9°C) to a low of 26.2°F (-3.2°C).Humidity
The average relative humidity in January is 73%.Rainfall
January is the month with the least rainfall. Rain falls for 9.6 days and accumulates 1.97" (50mm) of precipitation.Snowfall
Months with snowfall are January through April, November and December. In Rockville, Maryland, in January, snow falls for 5.3 days, with typically accumulated 2.6" (66mm) of snow. In Rockville, Maryland, during the entire year, snow falls for 17.7 days and aggregates up to 9.92" (252mm) of snow.Daylight
In January, the average length of the day in Rockville is 9h and 47min.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, in Rockville, Maryland, sunrise is at 7:16 am and sunset at 5:27 pm EST.
Sunshine
January, February and December, with an average of 5.1h of sunshine, are months with the least sunshine in Rockville, Maryland.UV index
January, February, November and December, with an average maximum UV index of 2, are months with the lowest UV index in Rockville. A UV Index value of 2, and less, symbolizes a minimal health hazard from exposure to the Sun's UV radiation for the average person.Note: During January, 2 as the daily maximum UV index converts into the following advice:
Babies, children, and those with sensitive skin should always avoid extended periods in the sun. UV radiation is strongest from the Sun during midday; protect yourself by staying in shaded areas. In the presence of strong sunlight, it's crucial to wear sunglasses that ward off UVA and UVB rays. Be careful! The Sun's UV radiation can nearly be doubled by the reflective quality of snow.
Frequently asked questions
What month is the coldest in Rockville?
How cold is January in Rockville?
What is the average humidity in January in Rockville?
What is the driest month in Rockville?
How much does it rain in Rockville in January?
How much does it snow in Rockville in January?
How many hours of daylight does Rockville have in January?
What time are sunrise and sunset in January in Rockville?
What are the months with the least sunshine in Rockville?
How many hours of sunshine does Rockville have in January?
When is the lowest UV index in Rockville?
What is the UV index reading in January in Rockville?
Average temperature in January
Rockville, MD
- Average high temperature in January: 39°F
The warmest month (with the highest average high temperature) is July (87.1°F).
The month with the lowest average high temperature is January (39°F).
- Average low temperature in January: 26.2°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 (26.2°F).
Average pressure in January
Rockville, 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
Rockville, MD
- Average wind speed in January: 7.6mph
The windiest month (with the highest average wind speed) is March (8mph).
The calmest month (with the lowest average wind speed) is August (5mph).
Average humidity in January
Rockville, MD
- Average humidity in January: 73%
The month with the highest relative humidity is December (77%).
The month with the lowest relative humidity is July (70%).
Average rainfall in January
Rockville, MD
- Average rainfall in January: 1.97"
The wettest month (with the highest rainfall) is August (3.9").
The driest month (with the least rainfall) is January (1.97").
Average rainfall days in January
Rockville, MD
- Average rainfall days in January: 9.6 days
The month with the highest number of rainy days is May (17.1 days).
The month with the least rainy days is November (9.2 days).
Average snowfall in January
Rockville, MD
- Average snowfall in January: 2.6"
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
Rockville, MD
- Average snowfall days in January: 5.3 days
The months with the highest number of snowfall days are January and February (5.3 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
Rockville, 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 months with the least sunshine are January, February and December (Average sunshine: 5h and 6min).
Average sunshine days in January
Rockville, MD
- Average sunshine days in January: 17.6 days
The month with the most sunshine days is November (19.4 days).
The month with the least sunshine days is July (12 days).
Average UV index in January
Rockville, 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
Rockville, MD
- Average cloud cover in January: 44
The month with the most cloud cover is March (Cloud cover 46).
The month with the least cloud cover is July (Cloud cover 30).
Average visibility in January
Rockville, 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).
Rockville, Maryland, USA
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