January weather forecast
Mount Vernon, WA

Share

Weather in January

Mount Vernon in January experiences considerable cloudiness with a relative humidity of 83% and an average of 18.3 rainfall days. Unpredictable weather patterns contribute to an average segment of just 9 hours of sunshine each day. As a direct response to this ongoing weather pattern, precipitation in the form of snow is fairly common. January also has the increased wind speeds, with an average speed of 7mph (11.3km/h). The temperatures indicate the traditional winter weather, from 37°F (2.8°C) to 44.2°F (6.8°C).

Temperature

In January, Mount Vernon's weather conditions record an average high-temperature of a chilly 44.2°F (6.8°C), demonstrating little divergence from the preceding month. January introduces a small decrease to a nighttime average of 37°F (2.8°C).

Humidity

January and February, with an average relative humidity of 83%, are the most humid months.

Rainfall

In Mount Vernon, in January, during 18.3 rainfall days, 4.13" (105mm) of precipitation is typically accumulated. In Mount Vernon, during the entire year, the rain falls for 185.2 days and collects up to 34.72" (882mm) of precipitation.

Snowfall

Months with snowfall in Mount Vernon, Washington, are January through April, November and December. In Mount Vernon, in January, during 2.2 snowfall days, 2.2" (56mm) of snow is typically accumulated. In Mount Vernon, during the entire year, snow falls for 9.9 days and aggregates up to 7.91" (201mm) of snow.

Daylight

In Mount Vernon, the average length of the day in January is 8h and 52min.
On the first day of January, sunrise is at 8:00 am and sunset at 4:24 pm. On the last day of the month, sunrise is at 7:39 am and sunset at 5:06 pm PST.

Sunshine

The average sunshine in January is 4h.

UV index

The months with the lowest UV index are January, February, November and December, with an average maximum UV index of 2. A UV Index estimate of 2, and below, represents a minimal health hazard from unsafe exposure to UV radiation for average individuals.
Note: The maximum daily UV index of 2 during January translates into the following directions:
Most individuals face no major issues with lengthy exposure to the sun, but children, infants, and individuals with fair skin always require protection. Avoiding the Sun during its peak radiation time around midday is a healthy practice. Employ a hat with a wide brim for robust protection, cutting UV exposure by half. Be careful! The Sun's UV radiation can nearly be doubled by the reflective quality of snow.
Updated: Jun 20, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

How cold does it get in January?

The average high-temperature, in January, in Mount Vernon, is 44.2°F (6.8°C), while the average low-temperature is 37°F (2.8°C).

What are the most humid months?

The months with the highest humidity are January and February, with an average relative humidity of 83%.

What is the average humidity in January?

In Mount Vernon, the average relative humidity in January is 83%.

How many days does it rain in January?

In Mount Vernon, in January, during 18.3 rainfall days, 4.13" (105mm) of precipitation is typically accumulated.

How much does it snow in Mount Vernon in January?

In Mount Vernon, in January, snow falls for 2.2 days, with typically accumulated 2.2" (56mm) of snow.

What is the average length of the day in January?

In Mount Vernon, Washington, the average day length in January is 8h and 52min.

When are sunrise and sunset in January?

On the first day of January, sunrise is at 8:00 am and sunset at 4:24 pm. On the last day of the month, sunrise is at 7:39 am and sunset at 5:06 pm PST.

How long on average sun shines in January?

In Mount Vernon, the average sunshine duration in January is 4h.

What is the month with the lowest UV index?

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

How high is the UV index in January?

In Mount Vernon, the average daily maximum UV index in January is 2. A UV Index of 2, and less, symbolizes a low health threat from unsafe exposure to Sun's UV rays.
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
Mount Vernon, WA

Average temperature in January - Mount Vernon, WA
  • Average high temperature in January: 44.2°F

The warmest months (with the highest average high temperature) are July and August (68.4°F).
The month with the lowest average high temperature is December (42.6°F).

  • Average low temperature in January: 37°F

The month with the highest average low temperature is August (54.1°F).
The coldest month (with the lowest average low temperature) is February (36.1°F).

Average pressure in January
Mount Vernon, WA

Average pressure in January - Mount Vernon, WA
  • Average pressure in January: 30.09"Hg

The month with the highest atmospheric pressure is January (30.09"Hg).
The months with the lowest atmospheric pressure are March, August and September (30.01"Hg).

Average wind speed in January
Mount Vernon, WA

Average wind speed in January - Mount Vernon, WA
  • Average wind speed in January: 7mph

The windiest month (with the highest average wind speed) is November (7.5mph).
The calmest month (with the lowest average wind speed) is August (3.7mph).

Average humidity in January
Mount Vernon, WA

Average humidity in January - Mount Vernon, WA
  • Average humidity in January: 83%

The months with the highest relative humidity are January and February (83%).
The month with the lowest relative humidity is July (75%).

Average rainfall in January
Mount Vernon, WA

Average rainfall in January - Mount Vernon, WA
  • Average rainfall in January: 4.13"

The wettest month (with the highest rainfall) is November (4.96").
The driest month (with the least rainfall) is July (0.63").

Average rainfall days in January
Mount Vernon, WA

Average rainfall days in January - Mount Vernon, WA
  • Average rainfall days in January: 18.3 days

The month with the highest number of rainy days is March (20.8 days).
The month with the least rainy days is August (7.2 days).

Average snowfall in January
Mount Vernon, WA

Average snowfall in January - Mount Vernon, WA
  • Average snowfall in January: 2.2"

The month with the highest snowfall is February (3.54").
The months with the least snowfall are May, June, July, August, September and October (0").

Average snowfall days in January
Mount Vernon, WA

Average snowfall days in January - Mount Vernon, WA
  • Average snowfall days in January: 2.2 days

The month with the highest number of snowfall days is February (3.6 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
Mount Vernon, WA

Average daylight in January / Average sunshine in January - Mount Vernon, WA
  • Average daylight in January: 8h and 5min

The month with the longest days is June (Average daylight: 16h and 0min).
The month with the shortest days is December (Average daylight: 8h and 24min).

  • Average sunshine in January: 4h and 0min

The months with the most sunshine are July and August (Average sunshine: 10h and 24min).
The month with the least sunshine is December (Average sunshine: 3h and 54min).

Average sunshine days in January
Mount Vernon, WA

Average sunshine days in January - Mount Vernon, WA
  • Average sunshine days in January: 11 days

The month with the most sunshine days is August (22.3 days).
The month with the least sunshine days is November (8.1 days).

Average UV index in January
Mount Vernon, WA

Average UV index in January - Mount Vernon, WA
  • Average UV index in January: 2

The month with the highest UV index is July (UV index 5).
The months with the lowest UV index are January, February, November and December (UV index 2).

Average cloud cover in January
Mount Vernon, WA

Average cloud cover in January - Mount Vernon, WA
  • Average cloud cover in January: 58

The month with the most cloud cover is December (Cloud cover 59).
The month with the least cloud cover is August (Cloud cover 26).

Average visibility in January
Mount Vernon, WA

Average visibility in January - Mount Vernon, WA
  • 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).

Mount Vernon, Washington, USA

Weather forecast for your location

1. Click Locate me button
2. Allow the app to use your location