January weather forecast
Glenallen, MD

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Weather in January

January, like December, in Glenallen, Maryland, is a wintry winter month, with an average temperature ranging between min 26.2°F (-3.2°C) and max 39°F (3.9°C).

Temperature

January is the coldest month, with the temperature often reaching an average high of 39°F (3.9°C) and an average low of 26.2°F (-3.2°C).

Humidity

In January, the average relative humidity is 73%.

Rainfall

January is the month with the least rainfall. Rain falls for 9.3 days and accumulates 2.17" (55mm) of precipitation.

Snowfall

Months with snowfall are January through April, November and December. The months with the most snowfall are January and March, with an average 3.03" (77mm) of accumulated snow.

Daylight

In January, the average length of the day 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 7:15 am and sunset at 5:27 pm EST.

Sunshine

The average sunshine in January is 5.1h.

UV index

January, November and December, with an average maximum UV index of 2, are months with the lowest UV index. 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: The maximum UV index of 2 during January translates into these guidelines:
Extended sunlight exposure does not pose significant problems for most people, except for children, infants, and people with fair skin who always need shielding. The mid-day Sun emits the most powerful UV radiation, so seek shade and minimize exposure. Wearing a wide-brim hat can block approximately 50% of UV radiation, protecting the eyes. Be vigilant! The reflective nature of snow can increase the Sun's UV radiation nearly twofold.
Updated: Jul 28, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What month is the coldest?

Glenallen notes the coldest temperatures in January, with a average high of 39°F (3.9°C) and a low of 26.2°F (-3.2°C).

How cold does it get in Glenallen in January?

The high-temperature, in January, in Glenallen, records 39°F (3.9°C), while the low-temperature is 26.2°F (-3.2°C).

What is the average humidity in January?

In Glenallen, the average relative humidity in January is 73%.

What is the driest month?

The month with the least rainfall is January, when the rain falls for 9.3 days and typically collects 2.17" (55mm) of precipitation.

How much does it rain in January?

In Glenallen, in January, during 9.3 rainfall days, 2.17" (55mm) of precipitation is typically accumulated.

What is the snowiest month?

The months with the most snowfall are January and March, with an average 3.03" (77mm) of accumulated snow.

How many days does it snow in January?

In Glenallen, in January, snow falls for 5.1 days, with typically accumulated 3.03" (77mm) of snow.

What is the average length of the day in January?

The average day length in January is 9h and 48min.

When is the sunrise / sunset in January?

In January, on the first day of the month, sunrise is at 7:27 am and sunset at 4:56 pm. On the last day of the month, sunrise is at 7:15 am and sunset at 5:27 pm EST.

How long on average sun shines in January?

In January, the average sunshine duration is 5.1h.

What are the months with the lowest UV index?

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

What is the UV index reading in January?

The average daily maximum UV index in January is 2. A UV Index estimate of 2, and below, represents a low health threat from unprotected exposure to UV radiation.
Average humidity
Average rainfall days
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in January
Glenallen, MD

Average temperature in January - Glenallen, MD
  • Average high temperature in January: 39°F

The warmest month (with the highest average high temperature) is July (87.3°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 (68.7°F).
The coldest month (with the lowest average low temperature) is January (26.2°F).

Average pressure in January
Glenallen, MD

Average pressure in January - Glenallen, 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
Glenallen, MD

Average wind speed in January - Glenallen, MD
  • Average wind speed in January: 7.8mph

The windiest month (with the highest average wind speed) is March (8.1mph).
The calmest month (with the lowest average wind speed) is August (5.1mph).

Average humidity in January
Glenallen, MD

Average humidity in January - Glenallen, MD
  • Average humidity in January: 73%

The months with the highest relative humidity are May, October and December (76%).
The month with the lowest relative humidity is July (70%).

Average rainfall in January
Glenallen, MD

Average rainfall in January - Glenallen, MD
  • Average rainfall in January: 2.17"

The wettest month (with the highest rainfall) is August (4.13").
The driest month (with the least rainfall) is January (2.17").

Average rainfall days in January
Glenallen, MD

Average rainfall days in January - Glenallen, MD
  • Average rainfall days in January: 9.3 days

The month with the highest number of rainy days is May (17.8 days).
The month with the least rainy days is November (8.8 days).

Average snowfall in January
Glenallen, MD

Average snowfall in January - Glenallen, MD
  • Average snowfall in January: 3.03"

The months with the highest snowfall are January and March (3.03").
The months with the least snowfall are May, June, July, August, September and October (0").

Average snowfall days in January
Glenallen, MD

Average snowfall days in January - Glenallen, MD
  • Average snowfall days in January: 5.1 days

The months with the highest number of snowfall days are January and February (5.1 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
Glenallen, MD

Average daylight in January / Average sunshine in January - Glenallen, 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
Glenallen, MD

Average sunshine days in January - Glenallen, MD
  • Average sunshine days in January: 18.1 days

The month with the most sunshine days is November (19.4 days).
The months with the least sunshine days are May and July (11 days).

Average UV index in January
Glenallen, MD

Average UV index in January - Glenallen, 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, November and December (UV index 2).

Average cloud cover in January
Glenallen, MD

Average cloud cover in January - Glenallen, 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
Glenallen, MD

Average visibility in January - Glenallen, 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).

Glenallen, Maryland, USA

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