December weather forecastGirdwood, AK
December
Weather in December
December is the harbinger of winter in Girdwood, Alaska, with temperatures reaching their lowest points for the year. With a reduction in daylight hours to just 5.7 on average, and an increase in average snowfall up to 9.57" (243mm), it truly heralds the start of the winter season. Although January and December share many climatological similarities, December receives slightly more precipitation, making it the wettest month of the year.Temperature
Girdwood experiences an average high-temperature of a still subzero cold 20.1°F (-6.6°C) in December, subtly different from November's 23.2°F (-4.9°C). December in Girdwood generally records an average low-temperature of 10.2°F (-12.1°C).Humidity
The months with the highest humidity are March and December, with an average relative humidity of 92%.Rainfall
In December, the rain falls for 7.1 days. Throughout December, 2.99" (76mm) of precipitation is accumulated. Throughout the year, there are 158.6 rainfall days, and 23.62" (600mm) of precipitation is accumulated.Snowfall
January through May, September through December are months with snowfall. The month with the most snowfall is December, when snow falls for 17.6 days and typically aggregates up to 9.57" (243mm) of snow.Daylight
With an average of 5h and 42min of daylight, December has the shortest days of the year.On the first day of December, sunrise is at 9:41 am and sunset at 3:50 pm. On the last day of the month, sunrise is at 10:07 am and sunset at 3:52 pm AKST.
Sunshine
The month with the least sunshine is December, with an average of 2.1h of sunshine.UV index
January through March, October through December, with an average maximum UV index of 1, are months with the lowest UV index. A UV Index reading of 2, and below, represents a low health risk from unprotected exposure to Sun's UV rays for ordinary individuals.Note: A maximum high UV index of 1 in December translates into the following recommendations:
Long-term sun exposure is typically not a concern for most. However, those with sensitive skin, infants, and children must always have protection. UV radiation from the Sun is most dangerous during midday; take precautions and seek shade. Always opt for UVA and UVB-resistant sunglasses on radiant days. Remember this! The UV radiation of the Sun can be nearly doubled by the reflective properties of snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Girdwood, AK
- Average high temperature in December: 20.1°F
The warmest month (with the highest average high temperature) is July (56.8°F).
The month with the lowest average high temperature is January (18°F).
- Average low temperature in December: 10.2°F
The month with the highest average low temperature is July (44.1°F).
The coldest month (with the lowest average low temperature) is January (7.5°F).
Average pressure in December
Girdwood, AK
- Average pressure in December: 29.67"Hg
The month with the highest atmospheric pressure is July (29.97"Hg).
The month with the lowest atmospheric pressure is November (29.66"Hg).
Average wind speed in December
Girdwood, AK
- Average wind speed in December: 5.9mph
The windiest months (with the highest average wind speed) are November and December (5.9mph).
The calmest month (with the lowest average wind speed) is July (4.7mph).
Average humidity in December
Girdwood, AK
- Average humidity in December: 92%
The months with the highest relative humidity are March and December (92%).
The month with the lowest relative humidity is June (79%).
Average rainfall in December
Girdwood, AK
- Average rainfall in December: 2.99"
The wettest month (with the highest rainfall) is October (3.03").
The driest month (with the least rainfall) is January (1.14").
Average rainfall days in December
Girdwood, AK
- Average rainfall days in December: 7.1 days
The month with the highest number of rainy days is August (21.8 days).
The month with the least rainy days is February (6 days).
Average snowfall in December
Girdwood, AK
- Average snowfall in December: 9.57"
The month with the highest snowfall is December (9.57").
The months with the least snowfall are June, July and August (0").
Average snowfall days in December
Girdwood, AK
- Average snowfall days in December: 17.6 days
The month with the highest number of snowfall days is December (17.6 days).
The months with the least snowfall days are June, July and August (0 days).
Average daylight in December /
Average sunshine in December
Girdwood, AK
- Average daylight in December: 5h and 42min
The month with the longest days is June (Average daylight: 19h and 6min).
The month with the shortest days is December (Average daylight: 5h and 42min).
- Average sunshine in December: 2h and 6min
The month with the most sunshine is May (Average sunshine: 8h and 30min).
The month with the least sunshine is December (Average sunshine: 2h and 6min).
Average sunshine days in December
Girdwood, AK
- Average sunshine days in December: 9.8 days
The month with the most sunshine days is January (14.2 days).
The month with the least sunshine days is August (8 days).
Average UV index in December
Girdwood, AK
- Average UV index in December: 1
The months with the highest UV index are June and July (UV index 3).
The months with the lowest UV index are January, February, March, October, November and December (UV index 1).
Average cloud cover in December
Girdwood, AK
- Average cloud cover in December: 70
The month with the most cloud cover is December (Cloud cover 70).
The month with the least cloud cover is May (Cloud cover 55).
Average visibility in December
Girdwood, AK
- Average visibility in December: 4mi
The month with the highest visibility is June (6mi).
The months with the lowest visibility are January, February, March, April, October, November and December (4mi).
