January weather forecast
Mount Rainier, MD

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Weather in January

During January, Mount Rainier experiences wintery conditions, characterized by snowfall and a low-lying cloud cover. January's temperatures peak at 39.9°F (4.4°C) but can fall as low as 27.7°F (-2.4°C), reinforcing the city's reputation for cold winters. Compared to February, January sees slightly heavier snowfall and marginally lower temperatures. Potential visibility issues are mitigated due to the high pressure system, ensuring an above-average visibility range. January concludes with lighter winds, setting the stage for the weather change expected in February.

Temperature

Mount Rainier, Maryland, reaches its lowest average temperatures in January, measuring 39.9°F (4.4°C) at the peak and 27.7°F (-2.4°C) at the lowest.

Humidity

In January, the average relative humidity is 72%.

Rainfall

January is the month with the least rainfall. Rain falls for 9.3 days and accumulates 2.01" (51mm) of precipitation.

Snowfall

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

Daylight

In January, the average length of the day is 9h and 49min.
On the first day of the month, sunrise is at 7:26 am and sunset at 4:56 pm. On the last day of January, in Mount Rainier, sunrise is at 7:15 am and sunset at 5:27 pm EST.

Sunshine

In Mount Rainier, Maryland, the average sunshine in January is 5.1h.

UV index

January and December, with an average maximum UV index of 2, are months with the lowest UV index in Mount Rainier, Maryland. A UV Index of 2, and less, symbolizes a low threat to health from unprotected exposure to Sun's UV rays for average individuals.
Note: The maximum daily UV index of 2 during January translates into the following directions:
Unlike children, who always need sun protection, most individuals can remain in the sun for up to an hour without getting burnt. The most potent solar radiation is around mid-day, so one should minimize exposure to direct sunlight during this period. Select sunglasses that boast both UVA and UVB protection to limit the adverse effects of the sun on the eyes. Mind you! Snow reflection can increase the intensity of the Sun's UV radiation nearly twofold.
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Frequently asked questions

What time of the year is the coldest in Mount Rainier?

Mount Rainier witnesses the coldest weather in January, with temperatures averaging a high of 39.9°F (4.4°C) and a low of 27.7°F (-2.4°C).

Is January cold in Mount Rainier?

In January, in Mount Rainier, the average high-temperature is 39.9°F (4.4°C), and the average low-temperature is 27.7°F (-2.4°C).

What is the average humidity in January in Mount Rainier?

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

What is the driest month in Mount Rainier?

January is the month with the least rainfall. Rain falls for 9.3 days and accumulates 2.01" (51mm) of precipitation.

How many days does it rain in January in Mount Rainier?

In Mount Rainier, in January, it is raining for 9.3 days, with typically 2.01" (51mm) of accumulated precipitation.

What is the snowiest month in Mount Rainier?

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

How much does it snow in Mount Rainier in January?

In Mount Rainier, Maryland, during January, snow falls for 4.1 days and regularly aggregates up to 2.6" (66mm) of snow.

How many hours of daylight does Mount Rainier have in January?

The average day length in January is 9h and 49min.

When is the sunrise / sunset in January in Mount Rainier?

In January, on the first day of the month, sunrise is at 7:26 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 many hours of sunshine does Mount Rainier have in January?

In Mount Rainier, Maryland, the average sunshine duration in January is 5.1h.

When is the lowest UV index in Mount Rainier?

January and December, with an average maximum UV index of 2, are months with the lowest UV index in Mount Rainier, Maryland.

What is the UV index intensity in January in Mount Rainier?

The average daily maximum UV index in January is 2. A UV Index of 2, and less, symbolizes a low health threat from 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
Mount Rainier, MD

Average temperature in January - Mount Rainier, 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).

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Average pressure in January
Mount Rainier, MD

Average pressure in January - Mount Rainier, 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).

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Average wind speed in January
Mount Rainier, MD

Average wind speed in January - Mount Rainier, 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).

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Average humidity in January
Mount Rainier, MD

Average humidity in January - Mount Rainier, 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%).

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Average rainfall in January
Mount Rainier, MD

Average rainfall in January - Mount Rainier, 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").

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Average rainfall days in January
Mount Rainier, MD

Average rainfall days in January - Mount Rainier, 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).

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Average snowfall in January
Mount Rainier, MD

Average snowfall in January - Mount Rainier, 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").

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Average snowfall days in January
Mount Rainier, MD

Average snowfall days in January - Mount Rainier, 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).

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Average daylight in January /
Average sunshine in January
Mount Rainier, MD

Average daylight in January / Average sunshine in January - Mount Rainier, 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).

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Average sunshine days in January
Mount Rainier, MD

Average sunshine days in January - Mount Rainier, 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).

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Average UV index in January
Mount Rainier, MD

Average UV index in January - Mount Rainier, 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).

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Average cloud cover in January
Mount Rainier, MD

Average cloud cover in January - Mount Rainier, 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).

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Average visibility in January
Mount Rainier, MD

Average visibility in January - Mount Rainier, 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).

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Mount Rainier, Maryland, USA

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