January weather forecastFriday Harbor, WA

January

Weather in January

January, the same as December, in Friday Harbor, Washington, is another chilly winter month, with an average temperature ranging between min 41°F (5°C) and max 45.3°F (7.4°C).

Temperature

January, February and December, when the average high-temperature reaches 45.3°F (7.4°C), are the coldest months.

Humidity

January, August and September, with an average relative humidity of 79%, are the most humid months.

Rainfall

In Friday Harbor, in January, during 17.3 rainfall days, 3.15" (80mm) of precipitation is typically accumulated. In Friday Harbor, during the entire year, the rain falls for 167.7 days and collects up to 23.46" (596mm) of precipitation.

Snowfall

Months with snowfall in Friday Harbor are January through March, November and December. In January, it is snowing for 1.5 days. Throughout January, 0.83" (21mm) of snow is accumulated. In Friday Harbor, during the entire year, snow falls for 6.9 days and aggregates up to 3.43" (87mm) of snow.

Ocean temperature

January and February, with an average ocean temperature of 45°F (7.2°C), are months with the coldest seawater.
Note: Entering waters of 45°F (7.2°C) is life-endangering. A mere moment in 55.4°F (13°C) waters feels piercing cold, and below 50°F (10°C) it can lead to immediate cold shock and cessation of breathing control, depending on body resilience.

Daylight

In Friday Harbor, the average length of the day in January is 8h and 51min.
On the first day of January, sunrise is at 8:03 am and sunset at 4:27 pm. On the last day of the month, sunrise is at 7:42 am and sunset at 5:08 pm PST.

Sunshine

The average sunshine in January is 4.2h.

UV index

January, February, November and December, with an average maximum UV index of 2, are months with the lowest UV index. A UV Index estimate of 2, and below, represents a minimal health vulnerability from exposure to the Sun's UV rays for the average person.
Note: The maximum daily UV index of 2 in January interprets into the following recommendations:
Extended exposure to the sun should always be avoided by children, infants, and those with sensitive skin. Sun's radiation is most powerful around mid-day, so it's best to limit outdoor activities during this time. Fend off the sun's harsh rays with appropriate clothing, a wide-brim hat, and UV-protective sunglasses. Caution! The reflection of snow can nearly double the intensity of the Sun's UV radiation.

Updated: Jun 19, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

The temperature hits its lowest levels in January, February and December, recording an average high-temperature of 45.3°F (7.4°C).

An average high-temperature, in January, in Friday Harbor, is 45.3°F (7.4°C) and the average low-temperature is 41°F (5°C).

January, August and September, with an average relative humidity of 79%, are most humid months.

The average relative humidity in January in Friday Harbor is 79%.

In Friday Harbor, in January, during 17.3 rainfall days, 3.15" (80mm) of precipitation is typically accumulated.

In January, it is snowing for 1.5 days. Throughout January, 0.83" (21mm) of snow is accumulated.

January and February, with an average ocean temperature of 45°F (7.2°C), are months with the coldest seawater.

In Friday Harbor, the average seawater temperature in January is 45°F (7.2°C). Swimming in 45°F (7.2°C) is considered life-threatening. Even a few minutes in 55.4°F (13°C) water is uncomfortable, and swimming below 50°F (10°C) may cause total loss of breathing control and cold shock, depending on a person's physique.

In January, the average day length is 8h and 51min.

In January, on the first day of the month, sunrise is at 8:03 am and sunset at 4:27 pm. On the last day of the month, sunrise is at 7:42 am and sunset at 5:08 pm PST.

In January, the average sunshine duration is 4.2h.

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

In Friday Harbor, Washington, the average daily maximum UV index in January is 2. A UV Index reading of 2, and below, represents a low health risk from unprotected exposure to UV radiation.

Today

Tomorrow

Long-term

Year January F M A M J J A S O N D

Dec

January

Feb

Average high temperature

45.3°F

Average low temperature

Average pressure

Average wind speed

Average max. wind speed

11.4mph

10.7mph

10.6mph

Average wind speed gusts

Average humidity

Average rainfall

Average rainfall days

Average snowfall

Average snowfall days

1.3

1.5

2.7

Average sea temperature

Average daylight

Average sunshine

Average sunshine days

10.6

10.8

8.9

Average UV index

Average cloud cover

Average visibility

Average temperature in January
Friday Harbor, WA

Average high temperature in January: 45.3°F

The warmest month (with the highest average high temperature) is July (64.9°F).
The months with the lowest average high temperature are January, February and December (45.3°F).

Average low temperature in January: 41°F

The month with the highest average low temperature is August (57.7°F).
The coldest month (with the lowest average low temperature) is February (40.5°F).

Average pressure in January
Friday Harbor, WA

Average pressure in January: 30.07"Hg

The month with the highest atmospheric pressure is January (30.07"Hg).
The month with the lowest atmospheric pressure is March (30"Hg).

Average wind speed in January
Friday Harbor, WA

Average wind speed in January: 9.7mph

The windiest month (with the highest average wind speed) is November (10.7mph).
The calmest month (with the lowest average wind speed) is August (4.9mph).

Average humidity in January
Friday Harbor, WA

Average humidity in January: 79%

The months with the highest relative humidity are January, August and September (79%).
The month with the lowest relative humidity is April (76%).

Average rainfall in January
Friday Harbor, WA

Average rainfall in January: 3.15"

The wettest month (with the highest rainfall) is November (3.43").
The driest month (with the least rainfall) is July (0.43").

Average rainfall days in January
Friday Harbor, WA

Average rainfall days in January: 17.3 days

The month with the highest number of rainy days is March (20.2 days).
The month with the least rainy days is August (5.3 days).

Average snowfall in January
Friday Harbor, WA

Average snowfall in January: 0.83"

The month with the highest snowfall is February (1.77").
The months with the least snowfall are April, May, June, July, August, September and October (0").

Average snowfall days in January
Friday Harbor, WA

Average snowfall days in January: 1.5 days

The month with the highest number of snowfall days is February (2.7 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).

Average sea temperature in January
Friday Harbor, WA

Average sea temperature in January: 45°F

The best months for swimming (with the highest average sea temperature) are August and September (52.3°F).
The coldest month (with the lowest average sea temperature) is February (44.9°F).

Average daylight in January /
Average sunshine in January
Friday Harbor, WA

Average daylight in January: 8h and 48min

The month with the longest days is June (Average daylight: 16h and 6min).
The month with the shortest days is December (Average daylight: 8h and 24min).

Average sunshine in January: 4h and 12min

The month with the most sunshine is July (Average sunshine: 11h and 6min).
The month with the least sunshine is December (Average sunshine: 4h and 6min).

Average sunshine days in January
Friday Harbor, WA

Average sunshine days in January: 10.8 days

The month with the most sunshine days is August (24.7 days).
The month with the least sunshine days is November (8.7 days).

Average UV index in January
Friday Harbor, 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
Friday Harbor, WA

Average cloud cover in January: 55

The months with the most cloud cover are February and December (Cloud cover 56).
The months with the least cloud cover are July and August (Cloud cover 23).

Average visibility in January
Friday Harbor, 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).