December weather forecastHarbor, OR
December
Weather in December
December, the first month of the winter in Harbor, is still a cool month, with temperature in the range of an average high of 50.9°F (10.5°C) and an average low of 43.2°F (6.2°C).Temperature
In Harbor, the month of December registers the lowest temperatures, averaging 50.9°F (10.5°C) at the peak and 43.2°F (6.2°C) at the lowest.Humidity
In Harbor, the average relative humidity in December is 79%.Rainfall
December is the month with the most rainfall. Rain falls for 17.1 days and accumulates 8.11" (206mm) of precipitation.Snowfall
In Harbor, snow does not fall in January, March through December.Ocean temperature
In December, the average ocean temperature is 52.2°F (11.2°C).Note: Entering waters of 52.2°F (11.2°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
The month with the shortest days is December, with an average of 9h and 12min of daylight.On the first day of the month, sunrise is at 7:26 am and sunset at 4:46 pm. On the last day of December, in Harbor, sunrise is at 7:45 am and sunset at 4:55 pm PST.
Sunshine
In Harbor, the average sunshine in December is 5h.UV index
In Harbor, the average daily maximum UV index in December is 3. A UV Index estimate of 3 to 5 represents a medium health hazard from unprotected exposure to Sun's UV rays for the average person.Note: A daily high UV index of 3 in December leads to these guidelines:
Be mindful. Individuals with a lighter skin tone may suffer burns in less than 30 minutes. During midday, the Sun's radiation is strongest, and it's advisable to reduce direct exposure. In bright sunlight, prioritize sunglasses that grant protection from UVA and UVB radiation. Heads up! The UV radiation from the Sun can almost be doubled by snow reflection.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Harbor, OR
- Average high temperature in December: 50.9°F
The warmest months (with the highest average high temperature) are July and August (68.5°F).
The month with the lowest average high temperature is December (50.9°F).
- Average low temperature in December: 43.2°F
The month with the highest average low temperature is July (55°F).
The coldest month (with the lowest average low temperature) is February (43°F).
Average pressure in December
Harbor, OR
- Average pressure in December: 30.1"Hg
The month with the highest atmospheric pressure is January (30.12"Hg).
The months with the lowest atmospheric pressure are August and September (30"Hg).
Average wind speed in December
Harbor, OR
- Average wind speed in December: 9.4mph
The windiest month (with the highest average wind speed) is June (10.1mph).
The calmest month (with the lowest average wind speed) is August (7.6mph).
Average humidity in December
Harbor, OR
- Average humidity in December: 79%
The month with the highest relative humidity is March (82%).
The months with the lowest relative humidity are July and September (76%).
Average rainfall in December
Harbor, OR
- Average rainfall in December: 8.11"
The wettest month (with the highest rainfall) is December (8.11").
The driest month (with the least rainfall) is July (0.12").
Average rainfall days in December
Harbor, OR
- Average rainfall days in December: 17.1 days
The month with the highest number of rainy days is March (18.6 days).
The month with the least rainy days is July (2.2 days).
Average snowfall in December
Harbor, OR
- Average snowfall in December: 0"
The month with the highest snowfall is February (0.71").
The months with the least snowfall are January, March, April, May, June, July, August, September, October, November and December (0").
Average snowfall days in December
Harbor, OR
- Average snowfall days in December: 0.1 days
The month with the highest number of snowfall days is February (0.3 days).
The months with the least snowfall days are January, March, April, May, June, July, August, September, October and November (0 days).
Average sea temperature in December
Harbor, OR
- Average sea temperature in December: 52.1°F
The best month for swimming (with the highest average sea temperature) is July (53.5°F).
The coldest months (with the lowest average sea temperature) are January, February and April (50.8°F).
Average daylight in December /
Average sunshine in December
Harbor, OR
- Average daylight in December: 9h and 12min
The month with the longest days is June (Average daylight: 15h and 12min).
The month with the shortest days is December (Average daylight: 9h and 12min).
- Average sunshine in December: 5h and 0min
The month with the most sunshine is July (Average sunshine: 11h and 48min).
The month with the least sunshine is January (Average sunshine: 4h and 42min).
Average sunshine days in December
Harbor, OR
- Average sunshine days in December: 12.9 days
The month with the most sunshine days is July (28.3 days).
The month with the least sunshine days is March (11 days).
Average UV index in December
Harbor, OR
- Average UV index in December: 3
The months with the highest UV index are June, July and August (UV index 5).
The month with the lowest UV index is February (UV index 2).
Average cloud cover in December
Harbor, OR
- Average cloud cover in December: 47
The months with the most cloud cover are January and March (Cloud cover 49).
The month with the least cloud cover is July (Cloud cover 9).
Average visibility in December
Harbor, OR
- 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).
