January weather forecast
Manassas, VA

Weather in January

January, the same as December, is another cold winter month in Manassas, Virginia, with average temperature ranging between min 26.4°F (-3.1°C) and max 40.6°F (4.8°C).

Temperature

The coldest month is January, with an average high-temperature of 40.6°F (4.8°C) and an average low-temperature of 26.4°F (-3.1°C).

Humidity

In January, the average relative humidity is 74%.

Rainfall

In Manassas, during January, the rain falls for 9.5 days and regularly aggregates up to 1.97" (50mm) of precipitation. In Manassas, during the entire year, the rain falls for 157.5 days and collects up to 30.35" (771mm) of precipitation.

Snowfall

Months with snowfall in Manassas, Virginia, are January through April, November and December. The month with the most snowfall in Manassas, Virginia, is January when snow falls for 4.9 days and typically aggregates up to 3.7" (94mm) of snow.

Daylight

The average length of the day in Manassas, Virginia, is 9.8h.

Sunshine

January, February and December, with an average of 5.2h of sunshine, are months with the least sunshine.

UV index

Months with the lowest UV index in Manassas are January, February, November and December, with an average maximum UV index of 2. A UV Index value of 2, and less, symbolizes a low threat to health from unprotected exposure to the Sun's UV rays for ordinary individuals.
Note: The daily maximum UV index of 2 in January interpret into the following advice:
For the majority, extended sun exposure is not of great concern. Infants and people with sensitive skin must always be protected. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking 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. Beware! The strength of the UV rays is increased nearly double-fold by the reflection of the snow.
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FAQ

What is the coldest month in Manassas?

January is the coldest month in Manassas, with an average high-temperature of 40.6°F (4.8°C) and an average low-temperature of 26.4°F (-3.1°C).

What is the average humidity in January in Manassas?

In Manassas, Virginia, the average relative humidity in January is 74%.

How many days does it rain in January in Manassas?

In Manassas, during January, the rain falls for 9.5 days and regularly aggregates up to 1.97" (50mm) of precipitation.

When does it snow the most in Manassas?

The month with the most snowfall in Manassas is January when snow falls for 4.9 days and typically aggregates up to 3.7" (94mm) of snow.

How much does it snow in Manassas in January?

In Manassas, Virginia, in January, snow falls for 4.9 days, with typically accumulated 3.7" (94mm) of snow.

What is the average length of the day in January in Manassas?

The average length of the day in January in Manassas is 9.8h.

What is the month with the least sunshine in Manassas?

Months with the least sunshine in Manassas, Virginia, are January, February and December, with an average of 5.2h of sunshine.

How many hours of sunshine does Manassas have in January?

In January, the average sunshine is 5.2h.

What are the months with the lowest UV index in Manassas?

Months with the lowest UV index are January, February, November and December, with an average maximum UV index of 2.

What is the UV index intensity in January in Manassas?

In Manassas, Virginia, the average daily maximum UV index in January is 2. A UV Index of 2, and less, symbolizes a minimal hazard to health from unprotected exposure to the UV radiation.

Average temperature in January
Manassas, VA

Average temperature in January - Manassas, VA
  • Average high temperature in January: 4.8°C

The warmest month (with the highest average high temperature) is July (31.3°C).
The month with the lowest average high temperature is January (4.8°C).

  • Average low temperature in January: -3.1°C

The month with the highest average low temperature is July (19.5°C).
The coldest month (with the lowest average low temperature) is January (-3.1°C).

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Average pressure in January
Manassas, VA

Average pressure in January - Manassas, VA
  • Average pressure in January: 1019.6mbar

The month with the highest atmospheric pressure is November (1020.7mbar).
The month with the lowest atmospheric pressure is June (1014.2mbar).

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Average wind speed in January
Manassas, VA

Average wind speed in January - Manassas, VA
  • Average wind speed in January: 10.5km/h

The windiest months (with the highest average wind speed) are March and April (11.2km/h).
The calmest month (with the lowest average wind speed) is August (7.4km/h).

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Average humidity in January
Manassas, VA

Average humidity in January - Manassas, VA
  • Average humidity in January: 74%

The month with the highest relative humidity is December (78%).
The month with the lowest relative humidity is July (72%).

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Average rainfall in January
Manassas, VA

Average rainfall in January - Manassas, VA
  • Average rainfall in January: 50mm

The wettest month (with the highest rainfall) is August (87mm).
The driest month (with the least rainfall) is September (49mm).

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Average rainfall days in January
Manassas, VA

Average rainfall days in January - Manassas, VA
  • Average rainfall days in January: 9.5 days

The month with the highest number of rainy days is May (17.4 days).
The month with the least rainy days is November (9.3 days).

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Average snowfall in January
Manassas, VA

Average snowfall in January - Manassas, VA
  • Average snowfall in January: 94mm

The month with the highest snowfall is January (94mm).
Months with the least snowfall are May, June, July, August, September and October (0mm).

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Average snowfall days in January
Manassas, VA

Average snowfall days in January - Manassas, VA
  • Average snowfall days in January: 4.9 days

The month with the highest number of snowfall days is February (5.2 days).
Months with the least snowfall days are May, June, July, August, September and October (0 days).

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Average daylight in January /
Average sunshine in January
Manassas, VA

Average daylight in January / Average sunshine in January - Manassas, VA
  • Average daylight in January: 9.8h

The month with the longest days is June (Average daylight: 14.8h).
The month with the shortest days is December (Average daylight: 9.5h).

  • Average sunshine in January: 5.2h

The month with the most sunshine is July (Average sunshine: 10.7h).
Months with the least sunshine are January, February and December (Average sunshine: 5.2).

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Average sunshine days in January
Manassas, VA

Average sunshine days in January - Manassas, VA
  • Average sunshine days in January: 17.8 days

The month with the most sunshine days is November (19.8 days).
The month with the least sunshine days is May (11.7 days).

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Average UV index in January
Manassas, VA

Average UV index in January - Manassas, VA
  • Average UV index in January: 2

Months with the highest UV index are May, June, July and August (UV index 6).
Months with the lowest UV index are January, February, November and December (UV index 2).

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Average cloud cover in January
Manassas, VA

Average cloud cover in January - Manassas, VA
  • Average cloud cover in January: 44

The month with the most cloud cover is March (Cloud cover 47).
The month with the least cloud cover is July (Cloud cover 31).

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Average visibility in January
Manassas, VA

Average visibility in January - Manassas, VA
  • Average visibility in January: 9km

Months with the highest visibility are January, February, March, April, June, July, August and November (9km).
Months with the lowest visibility are May, September, October and December (8km).

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