Contents
- Weather in December
- Frequently asked questions
- Average temperature in December
- Average pressure in December
- Average wind speed in December
- Average humidity in December
- Average rainfall in December
- Average rainfall days in December
- Average snowfall in December
- Average snowfall days in December
- Average sea temperature in December
- Average daylight in December
- Average sunshine in December
- Average sunshine days in December
- Average UV index in December
- Average cloud cover in December
- Average visibility in December
Weather in December
Temperature
Friday Harbor's coldest period falls in January, February and December, when the average high-temperatures ascend to 45.3°F (7.4°C).Humidity
In Friday Harbor, the average relative humidity in December is 77%.Rainfall
In Friday Harbor, in December, during 17.6 rainfall days, 2.95" (75mm) of precipitation is typically accumulated. Throughout the year, there are 167.7 rainfall days, and 23.46" (596mm) of precipitation is accumulated.Snowfall
Months with snowfall in Friday Harbor are January through March, November and December. In Friday Harbor, in December, snow falls for 1.3 days, with typically accumulated 0.31" (8mm) of snow. In Friday Harbor, during the entire year, snow falls for 6.9 days and aggregates up to 3.43" (87mm) of snow.Ocean temperature
In December, the average ocean temperature in Friday Harbor, Washington, is 46°F (7.8°C).Note: Taking a dip in 46°F (7.8°C) can be perilous. Submersion in temperatures under 50°F (10°C) triggers severe cold shock accompanied by hyperventilation.
Daylight
December has the shortest days of the year in Friday Harbor, with an average of 8h and 24min of daylight.On the first day of December, sunrise is at 7:43 am and sunset at 4:18 pm. On the last day of the month, sunrise is at 8:03 am and sunset at 4:26 pm PST.
Sunshine
With an average of 4.1h of sunshine, December has the least sunshine of the year in Friday Harbor.UV index
January, February, November and December, with an average maximum UV index of 2, are months with the lowest UV index in Friday Harbor. A UV Index estimate of 2, and below, represents a minimal health hazard from exposure to the Sun's UV rays for the average person.Note: A typical high UV index of 2 in December suggests the following recommendations:
While many people can endure lengthy sun exposure, it remains imperative to safeguard babies, children, and fair-skinned individuals. The solar radiation around mid-day is intense; avoid the Sun and stay safe. A wide-brimmed hat is a staple for defending the face, eyes, ears, and neck from the Sun. Forewarned is forearmed! The Sun's UV radiation can be almost doubled in intensity by snow reflection.
Frequently asked questions
What part of the year is the coldest in Friday Harbor?
What is the average December temperature in Friday Harbor?
What is the average humidity in December in Friday Harbor?
How many days does it rain in December in Friday Harbor?
How many days does it snow in December in Friday Harbor?
How cold is the water in December in Friday Harbor?
What is the month with the shortest days in Friday Harbor?
What is the average length of the day in December in Friday Harbor?
What time are sunrise and sunset in December in Friday Harbor?
What is the month with the least sunshine in Friday Harbor?
How long on average sun shines in December in Friday Harbor?
What is the month with the lowest UV index in Friday Harbor?
What is the UV index reading in December in Friday Harbor?
Average temperature in December
Friday Harbor, WA
- Average high temperature in December: 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 December: 40.6°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 December
Friday Harbor, WA
- Average pressure in December: 30.06"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 December
Friday Harbor, WA
- Average wind speed in December: 10.5mph
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 December
Friday Harbor, WA
- Average humidity in December: 77%
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 December
Friday Harbor, WA
- Average rainfall in December: 2.95"
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 December
Friday Harbor, WA
- Average rainfall days in December: 17.6 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 December
Friday Harbor, WA
- Average snowfall in December: 0.31"
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 December
Friday Harbor, WA
- Average snowfall days in December: 1.3 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 December
Friday Harbor, WA
- Average sea temperature in December: 46°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 December /
Average sunshine in December
Friday Harbor, WA
- Average daylight in December: 8h and 2min
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 December: 4h and 1min
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 December
Friday Harbor, WA
- Average sunshine days in December: 10.6 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 December
Friday Harbor, WA
- Average UV index in December: 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 December
Friday Harbor, WA
- Average cloud cover in December: 56
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 December
Friday Harbor, WA
- Average visibility in December: 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).
Friday Harbor, Washington, USA
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