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
In Rockville, January is the coldest month, with temperatures averaging a high of 44.2°F (6.8°C) and a low of 29.5°F (-1.4°C).Humidity
In January, the average relative humidity in Rockville is 73%.Rainfall
In Rockville, in January, during 9.6 rainfall days, 1.89" (48mm) of precipitation is typically accumulated. Throughout the year, there are 151.1 rainfall days, and 26.22" (666mm) of precipitation is accumulated.Snowfall
January through April, November and December are months with snowfall. In Rockville, in January, snow falls for 3.3 days, with typically accumulated 1.65" (42mm) of snow. In Rockville, during the entire year, snow falls for 10.5 days and aggregates up to 6.42" (163mm) of snow.Daylight
The average length of the day in January is 9h and 55min.On the first day of January in Rockville, Virginia, sunrise is at 7:25 am and sunset at 5:02 pm. On the last day of the month, sunrise is at 7:15 am and sunset at 5:32 pm EST.
Sunshine
The average sunshine in January in Rockville, Virginia, is 5.4h.UV index
January, February and December, with an average maximum UV index of 2, are months with the lowest UV index in Rockville, Virginia. A UV Index of 2, and less, symbolizes a low threat to health from unsafe exposure to UV radiation for the ordinary person.Note: An average UV index of 2 in January transforms into this advice:
Though extended exposure to the sun typically does not concern most people, it is crucial to always shield children, infants, and those with sensitive skin. Sun exposure should be minimized, especially during midday, to avoid harmful UV radiation. It's wise to wear UVA and UVB-blocking sunglasses when the sun shines brightly. Take careful note! The UV radiation of the Sun can be nearly doubled by snow reflection.
Frequently asked questions
What part of the year is the coldest in Rockville?
How cold is it in Rockville in January?
What is the average humidity in January 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?
How long on average sun shines in January in Rockville?
What are the months with the lowest UV index in Rockville?
What is the UV index reading in January in Rockville?
Average temperature in January
Rockville, VA
- Average high temperature in January: 44.2°F
The warmest month (with the highest average high temperature) is July (90.7°F).
The month with the lowest average high temperature is January (44.2°F).
- Average low temperature in January: 29.5°F
The month with the highest average low temperature is July (69.6°F).
The coldest month (with the lowest average low temperature) is January (29.5°F).
Average pressure in January
Rockville, VA
- Average pressure in January: 30.12"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, VA
- Average wind speed in January: 6.6mph
The windiest month (with the highest average wind speed) is April (7.4mph).
The calmest month (with the lowest average wind speed) is August (5.2mph).
Average humidity in January
Rockville, VA
- Average humidity in January: 73%
The month with the highest relative humidity is December (78%).
The month with the lowest relative humidity is July (68%).
Average rainfall in January
Rockville, VA
- Average rainfall in January: 1.89"
The wettest month (with the highest rainfall) is August (2.72").
The driest month (with the least rainfall) is September (1.65").
Average rainfall days in January
Rockville, VA
- Average rainfall days in January: 9.6 days
The month with the highest number of rainy days is May (16.6 days).
The month with the least rainy days is November (8.8 days).
Average snowfall in January
Rockville, VA
- Average snowfall in January: 1.65"
The month with the highest snowfall is February (1.77").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in January
Rockville, VA
- Average snowfall days in January: 3.3 days
The month with the highest number of snowfall days is February (3.5 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, VA
- Average daylight in January: 9h and 5min
The month with the longest days is June (Average daylight: 14h and 42min).
The month with the shortest days is December (Average daylight: 9h and 36min).
- Average sunshine in January: 5h and 2min
The month with the most sunshine is July (Average sunshine: 10h and 36min).
The month with the least sunshine is December (Average sunshine: 5h and 12min).
Average sunshine days in January
Rockville, VA
- Average sunshine days in January: 18.4 days
The month with the most sunshine days is November (19.5 days).
The month with the least sunshine days is May (11.9 days).
Average UV index in January
Rockville, VA
- Average UV index in January: 2
The month with the highest UV index is July (UV index 7).
The months with the lowest UV index are January, February and December (UV index 2).
Average cloud cover in January
Rockville, VA
- Average cloud cover in January: 42
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
Rockville, VA
- 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, Virginia, USA
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