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 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
Lowest temperatures are observed in January, February and December, averaging a high-temperature of 45.3°F (7.4°C).Humidity
In December, the average relative humidity in Roche Harbor is 77%.Rainfall
In Roche Harbor, in December, during 17.6 rainfall days, 2.95" (75mm) of precipitation is typically accumulated. In Roche Harbor, during the entire year, the rain falls for 167.7 days and collects up to 23.46" (596mm) of precipitation.Snowfall
January through March, November and December are months with snowfall in Roche Harbor. In Roche Harbor, in December, during 1.3 snowfall days, 0.31" (8mm) of snow is typically accumulated. Throughout the year, there are 6.9 snowfall days, and 3.43" (87mm) of snow is accumulated.Daylight
With an average of 8h and 24min of daylight, December has the shortest days of the year.On the first day of the month, sunrise is at 7:44 am and sunset at 4:19 pm. On the last day of December, in Roche Harbor, sunrise is at 8:04 am and sunset at 4:27 pm PST.
Sunshine
With an average of 4.1h of sunshine, December has the least sunshine of the year.UV index
January, February, November and December, with an average maximum UV index of 2, are months with the lowest UV index in Roche Harbor. A UV Index reading of 2, and below, represents a low threat to health from exposure to the Sun's UV rays for the ordinary person.Note: The maximum UV index of 2 during December leads to these instructions:
Most individuals can handle sun exposure for up to an hour without burning, but children must always be shielded from sun exposure. When the Sun's UV radiation is most intense during midday, it's best to find shade and limit exposure. In bright sunlight, prioritize sunglasses that grant protection from UVA and UVB radiation. Be informed! The Sun's UV radiation can be nearly doubled due to the reflection from snow.
Frequently asked questions
What is the coldest month in Roche Harbor?
What is the average December temperature in Roche Harbor?
What is the average humidity in December in Roche Harbor?
How many days does it rain in December in Roche Harbor?
How many days does it snow in December in Roche Harbor?
What is the month with the shortest days in Roche Harbor?
What is the average length of the day in December in Roche Harbor?
What time are sunrise and sunset in December in Roche Harbor?
What is the month with the least sunshine in Roche Harbor?
How long on average sun shines in December in Roche Harbor?
What are the months with the lowest UV index in Roche Harbor?
What is the UV index intensity in December in Roche Harbor?
Average temperature in December
Roche 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
Roche 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
Roche 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
Roche 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
Roche 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
Roche 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
Roche 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
Roche 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 daylight in December /
Average sunshine in December
Roche 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
Roche 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
Roche 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
Roche 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
Roche 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).
Roche Harbor, Washington, USA
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