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
December is the coldest month, with an average high-temperature of 45.1°F (7.3°C) and an average low-temperature of 38.5°F (3.6°C).Humidity
January through March, November and December, with an average relative humidity of 84%, are the most humid months in Astoria.Rainfall
The month with the most rainfall is December, when the rain falls for 21.2 days and typically aggregates up to 6.42" (163mm) of precipitation.Snowfall
January through March and December are months with snowfall. December is the first month it typically snows. Throughout December, in the average 0.3 snowfall days, it receives 0.04" (1mm) of snow. In Astoria, during the entire year, snow falls for 3.4 days and aggregates up to 1.93" (49mm) of snow.Ocean temperature
In December, the average ocean temperature in Astoria, Oregon, is 49.6°F (9.8°C).Note: With the appropriate swimsuit, one can swim in 49.6°F (9.8°C) even if temperatures dip below 50°F (10°C); otherwise, be ready for cold shock and breath issues. A fleeting swim around 55.4°F (13°C) is distressing.
Daylight
With an average of 8h and 42min of daylight, December has the shortest days of the year.On the first day of December, sunrise is at 7:38 am and sunset at 4:31 pm. On the last day of the month, sunrise is at 7:57 am and sunset at 4:39 pm PST.
Sunshine
In December, the average sunshine is 4.1h.UV index
January, February, November and December, with an average maximum UV index of 2, are months with the lowest UV index in Astoria. A UV Index reading of 2, and below, represents a minimal health vulnerability from exposure to the Sun's UV radiation for the ordinary person.Note: In December, a regular UV index of 2 translates into these guidelines:
Apart from children, who require continuous protection, most can endure sun exposure for up to an hour without experiencing burns. For skin protection, it's recommended to minimize Sun exposure during its peak hours around midday. Shield yourself from the harmful effects of UV radiation with sun-protective attire, a hat, and quality sunglasses. Be aware! The reflective nature of snow can magnify the Sun's UV radiation almost twofold.
Frequently asked questions
What time of the year is the coldest in Astoria?
What is the temperature in December in Astoria?
What are the most humid months in Astoria?
What is the average humidity in December in Astoria?
What is the rainiest month in Astoria?
How many days does it rain in December in Astoria?
When does it start to snow in Astoria?
What is the ocean temperature in December in Astoria?
What is the month with the shortest days in Astoria?
What is the average length of the day in December in Astoria?
When is the sunrise / sunset in December in Astoria?
How long on average sun shines in December in Astoria?
What are the months with the lowest UV index in Astoria?
What is the UV index intensity in December in Astoria?
Average temperature in December
Astoria, OR
- Average high temperature in December: 45.1°F
The warmest month (with the highest average high temperature) is August (67.6°F).
The month with the lowest average high temperature is December (45.1°F).
- Average low temperature in December: 38.5°F
The month with the highest average low temperature is August (53.1°F).
The coldest month (with the lowest average low temperature) is December (38.5°F).
Average pressure in December
Astoria, OR
- Average pressure in December: 30.06"Hg
The month with the highest atmospheric pressure is January (30.08"Hg).
The months with the lowest atmospheric pressure are March and September (30.02"Hg).
Average wind speed in December
Astoria, OR
- Average wind speed in December: 8.8mph
The windiest month (with the highest average wind speed) is January (9.1mph).
The calmest month (with the lowest average wind speed) is August (5.3mph).
Average humidity in December
Astoria, OR
- Average humidity in December: 84%
The months with the highest relative humidity are January, February, March, November and December (84%).
The month with the lowest relative humidity is May (81%).
Average rainfall in December
Astoria, OR
- Average rainfall in December: 6.42"
The wettest month (with the highest rainfall) is December (6.42").
The driest month (with the least rainfall) is July (0.51").
Average rainfall days in December
Astoria, OR
- Average rainfall days in December: 21.2 days
The month with the highest number of rainy days is December (21.2 days).
The month with the least rainy days is August (7.2 days).
Average snowfall in December
Astoria, OR
- Average snowfall in December: 0.04"
The month with the highest snowfall is February (0.91").
The months with the least snowfall are April, May, June, July, August, September, October and November (0").
Average snowfall days in December
Astoria, OR
- Average snowfall days in December: 0.3 days
The month with the highest number of snowfall days is February (1.4 days).
The months with the least snowfall days are April, May, June, July, August, September and October (0 days).
Average sea temperature in December
Astoria, OR
- Average sea temperature in December: 49.6°F
The best month for swimming (with the highest average sea temperature) is July (56.9°F).
The coldest month (with the lowest average sea temperature) is February (47.7°F).
Average daylight in December /
Average sunshine in December
Astoria, OR
- Average daylight in December: 8h and 4min
The month with the longest days is June (Average daylight: 15h and 42min).
The month with the shortest days is December (Average daylight: 8h and 42min).
- Average sunshine in December: 4h and 1min
The month with the most sunshine is August (Average sunshine: 9h and 54min).
The months with the least sunshine are January and February (Average sunshine: 3h and 48min).
Average sunshine days in December
Astoria, OR
- Average sunshine days in December: 9.2 days
The month with the most sunshine days is August (20.1 days).
The month with the least sunshine days is February (7.5 days).
Average UV index in December
Astoria, OR
- 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
Astoria, OR
- Average cloud cover in December: 58
The months with the most cloud cover are January and February (Cloud cover 60).
The month with the least cloud cover is August (Cloud cover 36).
Average visibility in December
Astoria, OR
- Average visibility in December: 6mi
The months with the highest visibility are January, February, March, April, May, June, October, November and December (6mi).
The months with the lowest visibility are July, August and September (5mi).
Astoria, Oregon, USA
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