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
January, with its high-temperature average of 44.2°F (6.8°C) and a low-temperature average of 29.5°F (-1.4°C), is the coldest month.Humidity
In January, the average relative humidity is 73%.Rainfall
In Roslyn Hills, during January, the rain falls for 9.6 days and regularly aggregates up to 1.89" (48mm) of precipitation. Throughout the year, in Roslyn Hills, 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 Roslyn Hills. In January, it is snowing for 3.3 days. Throughout January, 1.65" (42mm) of snow is accumulated. In Roslyn Hills, Virginia, during the entire year, snow falls for 10.5 days and aggregates up to 6.42" (163mm) of snow.Daylight
In January, the average length of the day in Roslyn Hills is 9h and 55min.On the first day of the month, sunrise is at 7:25 am and sunset at 5:02 pm. On the last day of January, sunrise is at 7:14 am and sunset at 5:32 pm EST.
Sunshine
In Roslyn Hills, the average sunshine in January 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 Roslyn Hills. A UV Index reading of 2, and below, represents a low health risk from exposure to the Sun's UV radiation for the average person.Note: In January, the maximum UV index of 2 translates into these guidelines:
It is important to always shield children, babies, and individuals with sensitive skin from prolonged exposure to the sun. Stay safe from the Sun's strongest UV rays by limiting exposure during midday. For a sun-safe wardrobe, go for clothes that are tightly woven and generously sized. Guard yourself! Snow reflection can almost double the UV radiation from the Sun.
Frequently asked questions
What is the coldest time of year in Roslyn Hills?
Is January cold in Roslyn Hills?
What is the average humidity in January in Roslyn Hills?
How much does it rain in Roslyn Hills in January?
How many days does it snow in January in Roslyn Hills?
How many hours of daylight does Roslyn Hills have in January?
What time are sunrise and sunset in January in Roslyn Hills?
How many hours of sunshine does Roslyn Hills have in January?
When is the lowest UV index in Roslyn Hills?
What is the UV index intensity in January in Roslyn Hills?
Average temperature in January
Roslyn Hills, 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
Roslyn Hills, 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
Roslyn Hills, 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
Roslyn Hills, 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
Roslyn Hills, 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
Roslyn Hills, 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
Roslyn Hills, 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
Roslyn Hills, 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
Roslyn Hills, 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
Roslyn Hills, 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
Roslyn Hills, 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
Roslyn Hills, 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
Roslyn Hills, 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).
Roslyn Hills, Virginia, USA
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