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
The lowest temperatures are recorded in December, with averages reaching a high of 35.8°F (2.1°C) and a low of 31.5°F (-0.3°C).Humidity
The average relative humidity in December is 84%.Rainfall
In December, the rain falls for 18.6 days. Throughout December, 8.7" (221mm) of precipitation is accumulated. Throughout the year, there are 221.8 rainfall days, and 80" (2032mm) of precipitation is accumulated.Snowfall
January through May, November and December are months with snowfall. In Ketchikan, in December, snow falls for 7.4 days, with typically accumulated 8.03" (204mm) of snow. In Ketchikan, during the entire year, snow falls for 40.7 days and aggregates up to 48.35" (1228mm) of snow.Ocean temperature
In Ketchikan, in December, the average water temperature is 45.9°F (7.7°C).Note: Immersing oneself in 45.9°F (7.7°C) at sub14°F (-10°C) temperatures is a recipe for harsh cold shock and quickened breathing unless adequately equipped.
Daylight
The month with the shortest days is December, with an average of 7h and 12min of daylight.On the first day of the month, sunrise is at 7:50 am and sunset at 3:21 pm. On the last day of December, sunrise is at 8:13 am and sunset at 3:26 pm AKST.
Sunshine
In Ketchikan, the average sunshine in December is 3.5h.UV index
January, November and December, with an average maximum UV index of 1, are months with the lowest UV index. A UV Index of 2, and less, symbolizes a minimal health hazard from unprotected exposure to Sun's UV rays for the ordinary person.Note: The maximum daily UV index, 1 in December, converts into the following recommendations:
Extended time in the sun generally does not harm most, but those with sensitive skin, infants, and children should always be protected. The Sun's most harmful UV rays are emitted around midday; avoid staying outdoors for long during this time. To mitigate harm from sun exposure, pick sunglasses offering UVA and UVB defense. Be aware! The reflective nature of snow can magnify the Sun's UV radiation almost twofold.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What month is the coldest?
How cold is December?
What is the average humidity in December?
How much does it rain in December?
How much does it snow in December?
What is the ocean temperature in December?
What is the month with the shortest days?
How many hours of daylight does Ketchikan have in December?
When are sunrise and sunset in December?
How many hours of sunshine does Ketchikan have in December?
When is the lowest UV index?
How high is the UV index in December?
Average temperature in December
Ketchikan, AK
- Average high temperature in December: 35.8°F
The warmest months (with the highest average high temperature) are July and August (60.8°F).
The month with the lowest average high temperature is December (35.8°F).
- Average low temperature in December: 31.5°F
The month with the highest average low temperature is August (52°F).
The coldest month (with the lowest average low temperature) is February (30.6°F).
Average pressure in December
Ketchikan, AK
- Average pressure in December: 29.88"Hg
The month with the highest atmospheric pressure is July (30.06"Hg).
The month with the lowest atmospheric pressure is November (29.8"Hg).
Average wind speed in December
Ketchikan, AK
- Average wind speed in December: 7.8mph
The windiest month (with the highest average wind speed) is January (8.7mph).
The calmest months (with the lowest average wind speed) are July and August (5.3mph).
Average humidity in December
Ketchikan, AK
- Average humidity in December: 84%
The month with the highest relative humidity is January (88%).
The month with the lowest relative humidity is May (82%).
Average rainfall in December
Ketchikan, AK
- Average rainfall in December: 8.7"
The wettest month (with the highest rainfall) is January (9.69").
The driest month (with the least rainfall) is May (3.46").
Average rainfall days in December
Ketchikan, AK
- Average rainfall days in December: 18.6 days
The month with the highest number of rainy days is November (21.4 days).
The month with the least rainy days is February (14.2 days).
Average snowfall in December
Ketchikan, AK
- Average snowfall in December: 8.03"
The month with the highest snowfall is February (13.11").
The months with the least snowfall are June, July, August, September and October (0").
Average snowfall days in December
Ketchikan, AK
- Average snowfall days in December: 7.4 days
The month with the highest number of snowfall days is March (10.8 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average sea temperature in December
Ketchikan, AK
- Average sea temperature in December: 45.8°F
The best month for swimming (with the highest average sea temperature) is August (55.9°F).
The coldest month (with the lowest average sea temperature) is March (42.5°F).
Average daylight in December /
Average sunshine in December
Ketchikan, AK
- Average daylight in December: 7h and 1min
The month with the longest days is June (Average daylight: 17h and 24min).
The month with the shortest days is December (Average daylight: 7h and 12min).
- Average sunshine in December: 3h and 3min
The month with the most sunshine is May (Average sunshine: 7h and 12min).
The month with the least sunshine is January (Average sunshine: 3h and 0min).
Average sunshine days in December
Ketchikan, AK
- Average sunshine days in December: 8.9 days
The month with the most sunshine days is July (11.9 days).
The month with the least sunshine days is November (5.6 days).
Average UV index in December
Ketchikan, AK
- Average UV index in December: 1
The months with the highest UV index are July and August (UV index 4).
The months with the lowest UV index are January, November and December (UV index 1).
Average cloud cover in December
Ketchikan, AK
- Average cloud cover in December: 64
The month with the most cloud cover is January (Cloud cover 71).
The month with the least cloud cover is May (Cloud cover 55).
Average visibility in December
Ketchikan, AK
- Average visibility in December: 6mi
The months with the highest visibility are February, March, April, May, June, September, October, November and December (6mi).
The months with the lowest visibility are January, July and August (5mi).
Ketchikan, Alaska, USA
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