December weather forecastOpportunity, WA
December
Weather in December
December, the first month of the winter in Opportunity, is also an icy month, with temperature in the range of an average high of 32°F (0°C) and an average low of 21.9°F (-5.6°C).Temperature
With average high and low temperatures of 32°F (0°C) and 21.9°F (-5.6°C) respectively, December is Opportunity's coldest month.Humidity
The average relative humidity in December in Opportunity is 88%.Rainfall
In December, in Opportunity, the rain falls for 8.9 days. Throughout December, 2.2" (56mm) of precipitation is accumulated. Throughout the year, in Opportunity, there are 125.4 rainfall days, and 17.28" (439mm) of precipitation is accumulated.Snowfall
January through May, September through December are months with snowfall in Opportunity. In Opportunity, in December, during 13.9 snowfall days, 8.9" (226mm) of snow is typically accumulated. Throughout the year, in Opportunity, Washington, there are 56.4 snowfall days, and 37.4" (950mm) of snow is accumulated.Daylight
With an average of 8h and 30min of daylight, December has the shortest days of the year.On the first day of the month, sunrise is at 7:17 am and sunset at 3:59 pm. On the last day of December, in Opportunity, sunrise is at 7:37 am and sunset at 4:07 pm PST.
Sunshine
January and December, with an average of 3.8h of sunshine, are months with the least sunshine in Opportunity.UV index
With an average maximum UV index of 1, December is the month with the lowest UV index in Opportunity. A UV Index of 2, and less, symbolizes a minimal health hazard from exposure to the Sun's UV rays for the ordinary person.Note: A maximum UV index of 1 in December translates into the following recommendations:
Though the majority can handle prolonged sun exposure, it is crucial to always shield babies, children, and those with fair skin. Being in direct Sun during midday can be harmful due to intense solar radiation; take precautions. Combat UV radiation's detrimental effects with sun-safe clothing and UV-blocking eyewear. Notice this! Nearly double the intensity of the Sun's UV radiation can be caused by snow reflection.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Opportunity, WA
- Average high temperature in December: 32°F
The warmest month (with the highest average high temperature) is August (83.3°F).
The month with the lowest average high temperature is December (32°F).
- Average low temperature in December: 21.9°F
The month with the highest average low temperature is August (55.9°F).
The coldest month (with the lowest average low temperature) is December (21.9°F).
Average pressure in December
Opportunity, WA
- Average pressure in December: 30.17"Hg
The month with the highest atmospheric pressure is January (30.19"Hg).
The month with the lowest atmospheric pressure is August (29.91"Hg).
Average wind speed in December
Opportunity, WA
- Average wind speed in December: 4.7mph
The windiest month (with the highest average wind speed) is April (6.1mph).
The calmest month (with the lowest average wind speed) is December (4.7mph).
Average humidity in December
Opportunity, WA
- Average humidity in December: 88%
The month with the highest relative humidity is January (91%).
The month with the lowest relative humidity is August (43%).
Average rainfall in December
Opportunity, WA
- Average rainfall in December: 2.2"
The wettest month (with the highest rainfall) is January (2.28").
The driest months (with the least rainfall) are July and August (0.35").
Average rainfall days in December
Opportunity, WA
- Average rainfall days in December: 8.9 days
The month with the highest number of rainy days is March (16 days).
The month with the least rainy days is July (5.1 days).
Average snowfall in December
Opportunity, WA
- Average snowfall in December: 8.9"
The month with the highest snowfall is January (10.51").
The months with the least snowfall are June, July and August (0").
Average snowfall days in December
Opportunity, WA
- Average snowfall days in December: 13.9 days
The month with the highest number of snowfall days is December (13.9 days).
The months with the least snowfall days are June, July and August (0 days).
Average daylight in December /
Average sunshine in December
Opportunity, WA
- Average daylight in December: 8h and 30min
The month with the longest days is June (Average daylight: 15h and 54min).
The month with the shortest days is December (Average daylight: 8h and 30min).
- Average sunshine in December: 3h and 48min
The month with the most sunshine is August (Average sunshine: 12h and 0min).
The months with the least sunshine are January and December (Average sunshine: 3h and 48min).
Average sunshine days in December
Opportunity, WA
- Average sunshine days in December: 13.4 days
The month with the most sunshine days is July (24.3 days).
The month with the least sunshine days is March (10.3 days).
Average UV index in December
Opportunity, WA
- Average UV index in December: 1
The month with the highest UV index is July (UV index 6).
The month with the lowest UV index is December (UV index 1).
Average cloud cover in December
Opportunity, WA
- Average cloud cover in December: 61
The month with the most cloud cover is January (Cloud cover 62).
The months with the least cloud cover are July and August (Cloud cover 13).
Average visibility in December
Opportunity, WA
- Average visibility in December: 4mi
The months with the highest visibility are April, May, June, July, August, September and October (6mi).
The months with the lowest visibility are January, February and December (4mi).
