January weather forecast
Greenbelt, MD

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Weather in January

The city of Greenbelt awakens to a new year under conditions typical of a Maryland winter. January weather features cold temperatures, with an average high of 39.9°F (4.4°C) and a low of 27.7°F (-2.4°C). Relative humidity and cloud cover are usually at their most during this month, resulting in foggy mornings and cloudy days. Comparing to February, a very minor increase in temperature is expected. However, residents are advised to brace for cold winds when venturing outdoors, winter clothing is a must.

Temperature

January is the month when Greenbelt sees the lowest average temperatures, with a high of 39.9°F (4.4°C) and a low of 27.7°F (-2.4°C).

Humidity

In Greenbelt, the average relative humidity in January is 72%.

Rainfall

The month with the least rainfall is January, when the rain falls for 9.3 days and typically collects 2.01" (51mm) of precipitation.

Snowfall

January through April and December are months with snowfall. January is the month with the most snowfall. Snow falls for 4.1 days and accumulates 2.6" (66mm) of snow.

Daylight

The average length of the day in January in Greenbelt is 9h and 48min.
On the first day of the month, sunrise is at 7:26 am and sunset at 4:55 pm. On the last day of January, sunrise is at 7:14 am and sunset at 5:26 pm EST.

Sunshine

In January, the average sunshine is 5.1h.

UV index

The months with the lowest UV index are January and December, with an average maximum UV index of 2. A UV Index estimate of 2, and below, represents a minimal health hazard from exposure to the Sun's UV rays for the ordinary person.
Note: In January, a daily maximum UV index of 2 leads to the following instructions:
Extended sunlight exposure does not pose significant problems for most people, except for children, infants, and people with fair skin who always need shielding. Given the potency of the midday Sun's UV radiation, one should avoid prolonged exposure. A hat with a broad brim is indispensable, filtering out up to half of UV rays. Be cautious! The UV radiation from the Sun can be magnified almost twofold by snow reflection.
Updated: Jun 4, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What month is the coldest?

In Greenbelt, the lowest temperatures are generally noted in January, averaging a high of 39.9°F (4.4°C) and a low of 27.7°F (-2.4°C).

How cold is it in January?

The high-temperature, in January, in Greenbelt, is 39.9°F (4.4°C), while the low-temperature averages to 27.7°F (-2.4°C).

What is the average humidity in January in Greenbelt?

In January, the average relative humidity is 72%.

What is the driest month?

The month with the least rainfall in Greenbelt is January, when the rain falls for 9.3 days and typically collects 2.01" (51mm) of precipitation.

How many days does it rain in January?

In January, the rain falls for 9.3 days. Throughout January, 2.01" (51mm) of precipitation is accumulated.

What is the snowiest month?

The month with the most snowfall is January, when snow falls for 4.1 days and typically aggregates up to 2.6" (66mm) of snow.

How many days does it snow in January?

In Greenbelt, Maryland, in January, during 4.1 snowfall days, 2.6" (66mm) of snow is typically accumulated.

What is the average length of the day in January?

In Greenbelt, the average day length in January is 9h and 48min.

When is the sunrise / sunset in January?

On the first day of January, sunrise is at 7:26 am and sunset at 4:55 pm. On the last day of the month, sunrise is at 7:14 am and sunset at 5:26 pm EST.

How many hours of sunshine does Greenbelt have in January?

In January, the average sunshine duration in Greenbelt is 5.1h.

What are the months with the lowest UV index?

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

What is the UV index intensity in January?

In January, the average daily maximum UV index is 2. A UV Index estimate of 2, and below, represents a minimal hazard to health from unsafe exposure to Sun's UV rays.
Today
Tomorrow
Long-term
YearJanuaryFMAMJJASOND
Dec
January
Feb
Average high temperature
45.5°F 7.5°C
39.9°F 4.4°C
44.2°F 6.8°C
Average low temperature
34.3°F 1.3°C
27.7°F -2.4°C
30°F -1.1°C
Average pressure
30.11" 765mmHg
30.11" 765mmHg
30.07" 764mmHg
Average wind speed
7.3mph 11.7km/h
7.9mph 12.7km/h
8mph 12.9km/h
Average max. wind speed
7.9mph 12.7km/h
8.6mph 13.8km/h
8.6mph 13.8km/h
Average wind speed gusts
11.7mph 18.8km/h
12.7mph 20.4km/h
13mph 20.9km/h
Average humidity
76%
72%
73%
Average rainfall
2.6" 66mm
2.01" 51mm
2.09" 53mm
Average rainfall days
9.8
9.3
10
Average snowfall
0.67" 17mm
2.6" 66mm
2.24" 57mm
Average snowfall days
2.4
4.1
3.9
Average daylight
9h 3min
9h 5min
10h 5min
Average sunshine
5h 1min
5h 1min
5h 0min
Average sunshine days
18.1
18.6
15.2
Average UV index
2
2
3
Average cloud cover
45%
43%
45%
Average visibility
6mi 9.7km
6mi 9.7km
6mi 9.7km

Average temperature in January
Greenbelt, MD

Average temperature in January - Greenbelt, MD
  • Average high temperature in January: 39.9°F

The warmest month (with the highest average high temperature) is July (87.4°F).
The month with the lowest average high temperature is January (39.9°F).

  • Average low temperature in January: 27.7°F

The month with the highest average low temperature is July (70°F).
The coldest month (with the lowest average low temperature) is January (27.7°F).

Average pressure in January
Greenbelt, MD

Average pressure in January - Greenbelt, 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 (29.94"Hg).

Average wind speed in January
Greenbelt, MD

Average wind speed in January - Greenbelt, MD
  • Average wind speed in January: 7.9mph

The windiest month (with the highest average wind speed) is March (8.3mph).
The calmest month (with the lowest average wind speed) is August (5.3mph).

Average humidity in January
Greenbelt, MD

Average humidity in January - Greenbelt, MD
  • Average humidity in January: 72%

The months with the highest relative humidity are May, October and December (76%).
The months with the lowest relative humidity are April and July (71%).

Average rainfall in January
Greenbelt, MD

Average rainfall in January - Greenbelt, MD
  • Average rainfall in January: 2.01"

The wettest month (with the highest rainfall) is August (3.58").
The driest month (with the least rainfall) is January (2.01").

Average rainfall days in January
Greenbelt, MD

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

The month with the highest number of rainy days is May (17.9 days).
The month with the least rainy days is November (9 days).

Average snowfall in January
Greenbelt, MD

Average snowfall in January - Greenbelt, MD
  • Average snowfall in January: 2.6"

The month with the highest snowfall is January (2.6").
The months with the least snowfall are May, June, July, August, September, October and November (0").

Average snowfall days in January
Greenbelt, MD

Average snowfall days in January - Greenbelt, MD
  • Average snowfall days in January: 4.1 days

The month with the highest number of snowfall days is January (4.1 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
Greenbelt, MD

Average daylight in January / Average sunshine in January - Greenbelt, 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 54min).
The month with the least sunshine is February (Average sunshine: 5h and 0min).

Average sunshine days in January
Greenbelt, MD

Average sunshine days in January - Greenbelt, MD
  • Average sunshine days in January: 18.6 days

The month with the most sunshine days is November (19.1 days).
The month with the least sunshine days is May (11.8 days).

Average UV index in January
Greenbelt, MD

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

Average cloud cover in January
Greenbelt, MD

Average cloud cover in January - Greenbelt, MD
  • Average cloud cover in January: 43

The month with the most cloud cover is March (Cloud cover 46).
The month with the least cloud cover is July (Cloud cover 29).

Average visibility in January
Greenbelt, MD

Average visibility in January - Greenbelt, MD
  • Average visibility in January: 6mi

The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).

Greenbelt, Maryland, USA

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