December weather forecastOlympia, WA
December
Weather in December
December seals the year with Olympia fully enveloped in winter. The temperature falls further, with higher chances of snowfall as compared to the previous months. Rainfall peaks with an average of 5.79" (147mm), the maximum precipitation for the year. The short daylight hours and decreased visibility due to fog can obstruct travel plans, requiring extra preparation. Despite the cold weather and frequent showers, Olympia remains a charming sight to behold during the holiday season.Temperature
Olympia, Washington, records the coldest temperatures in December, averaging a high of 43°F (6.1°C) and a low of 33.4°F (0.8°C).Humidity
The months with the highest humidity are January, November and December, with an average relative humidity of 89%.Rainfall
December is the month with the most rainfall in Olympia. Rain falls for 18.8 days and accumulates 5.79" (147mm) of precipitation.Snowfall
January through March, November and December are months with snowfall. In Olympia, in December, during 1.4 snowfall days, 0.31" (8mm) of snow is typically accumulated. Throughout the year, there are 8.7 snowfall days, and 5.31" (135mm) of snow is accumulated.Daylight
The month with the shortest days is December, with an average of 8h and 36min of daylight.On the first day of December in Olympia, sunrise is at 7:37 am and sunset at 4:24 pm. On the last day of the month, sunrise is at 7:57 am and sunset at 4:32 pm PST.
Sunshine
With an average of 3.4h 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 Olympia. A UV Index of 2, and less, symbolizes a minimal health vulnerability from unsafe exposure to UV radiation for ordinary individuals.Note: An average UV index of 2 in December transforms into this advice:
Despite most people tolerating extended sun exposure, it is critical to always protect those with sensitive skin, infants, and children. The Sun is at its harshest during midday; protect yourself by staying in shaded areas and minimizing exposure. Consider a wide-brim hat essential for effective sun defense covering your face, neck, and eyes. Pay attention! The reflection of snow can enhance the Sun's UV radiation almost double.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Olympia, WA
- Average high temperature in December: 43°F
The warmest month (with the highest average high temperature) is August (78.6°F).
The month with the lowest average high temperature is December (43°F).
- Average low temperature in December: 33.4°F
The month with the highest average low temperature is August (50.5°F).
The coldest month (with the lowest average low temperature) is December (33.4°F).
Average pressure in December
Olympia, WA
- Average pressure in December: 30.08"Hg
The month with the highest atmospheric pressure is January (30.09"Hg).
The month with the lowest atmospheric pressure is March (30.01"Hg).
Average wind speed in December
Olympia, WA
- Average wind speed in December: 4.2mph
The windiest months (with the highest average wind speed) are March and November (4.6mph).
The calmest month (with the lowest average wind speed) is September (3.8mph).
Average humidity in December
Olympia, WA
- Average humidity in December: 89%
The months with the highest relative humidity are January, November and December (89%).
The month with the lowest relative humidity is July (71%).
Average rainfall in December
Olympia, WA
- Average rainfall in December: 5.79"
The wettest month (with the highest rainfall) is December (5.79").
The driest month (with the least rainfall) is July (0.39").
Average rainfall days in December
Olympia, WA
- Average rainfall days in December: 18.8 days
The month with the highest number of rainy days is March (20.4 days).
The month with the least rainy days is August (5.5 days).
Average snowfall in December
Olympia, WA
- Average snowfall in December: 0.31"
The month with the highest snowfall is February (2.32").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days in December
Olympia, WA
- Average snowfall days in December: 1.4 days
The month with the highest number of snowfall days is February (3.3 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
Olympia, WA
- Average daylight in December: 8h and 36min
The month with the longest days is June (Average daylight: 15h and 48min).
The month with the shortest days is December (Average daylight: 8h and 36min).
- Average sunshine in December: 3h and 24min
The month with the most sunshine is August (Average sunshine: 10h and 12min).
The month with the least sunshine is December (Average sunshine: 3h and 24min).
Average sunshine days in December
Olympia, WA
- Average sunshine days in December: 9.8 days
The month with the most sunshine days is August (22.4 days).
The month with the least sunshine days is February (8.4 days).
Average UV index in December
Olympia, WA
- Average UV index in December: 2
The months with the highest UV index are June and 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
Olympia, WA
- Average cloud cover in December: 65
The months with the most cloud cover are January and December (Cloud cover 65).
The months with the least cloud cover are July and August (Cloud cover 35).
Average visibility in December
Olympia, WA
- Average visibility in December: 4mi
The months with the highest visibility are June, July and August (5mi).
The months with the lowest visibility are January, February, March, April, May, September, October, November and December (4mi).
