December weather forecastPorter, WA
December
Weather in December
The first month of the winter, December, is also an icy month in Porter, Washington, with temperature in the range of an average low of 33.3°F (0.7°C) and an average high of 42.3°F (5.7°C).Temperature
With average high and low temperatures of 42.3°F (5.7°C) and 33.3°F (0.7°C) respectively, December is Porter's coldest month.Humidity
December is the most humid month in Porter, with an average relative humidity of 91%.Rainfall
In December, the rain falls for 19.8 days. Throughout December, 7.17" (182mm) of precipitation is accumulated. Throughout the year, there are 183.5 rainfall days, and 44.17" (1122mm) of precipitation is accumulated.Snowfall
Months with snowfall in Porter are January through March, November and December. In December, it is snowing for 1.2 days. Throughout December, 0.24" (6mm) of snow is accumulated. Throughout the year, in Porter, there are 9.1 snowfall days, and 5.75" (146mm) 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 the month, sunrise is at 7:38 am and sunset at 4:26 pm. On the last day of December, sunrise is at 7:58 am and sunset at 4:34 pm PST.
Sunshine
With an average of 3.3h of sunshine, December has the least sunshine of the year in Porter.UV index
January, February, November and December, with an average maximum UV index of 2, are months with the lowest UV index. A UV Index value of 2, and less, symbolizes a low health risk from exposure to the Sun's UV radiation for average individuals.Note: In December, an average UV index of 2 transforms into the following instructions:
Infants, children, and people with sensitive skin should always have protection against lengthy periods of sun exposure. Minimize direct exposure to the Sun during midday when its radiation is at its peak. In the presence of strong sunlight, it's crucial to wear sunglasses that ward off UVA and UVB rays. Forewarned is forearmed! The Sun's UV radiation can be almost doubled in intensity by snow reflection.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Porter, WA
- Average high temperature in December: 42.3°F
The warmest month (with the highest average high temperature) is August (76.6°F).
The month with the lowest average high temperature is December (42.3°F).
- Average low temperature in December: 33.3°F
The month with the highest average low temperature is August (50.2°F).
The coldest month (with the lowest average low temperature) is December (33.3°F).
Average pressure in December
Porter, WA
- Average pressure in December: 30.06"Hg
The month with the highest atmospheric pressure is January (30.08"Hg).
The month with the lowest atmospheric pressure is March (30.01"Hg).
Average wind speed in December
Porter, WA
- Average wind speed in December: 4.1mph
The windiest month (with the highest average wind speed) is June (4.5mph).
The calmest month (with the lowest average wind speed) is September (3.5mph).
Average humidity in December
Porter, WA
- Average humidity in December: 91%
The month with the highest relative humidity is December (91%).
The month with the lowest relative humidity is July (73%).
Average rainfall in December
Porter, WA
- Average rainfall in December: 7.17"
The wettest month (with the highest rainfall) is January (7.32").
The driest month (with the least rainfall) is July (0.43").
Average rainfall days in December
Porter, WA
- Average rainfall days in December: 19.8 days
The month with the highest number of rainy days is March (20.8 days).
The month with the least rainy days is August (5.7 days).
Average snowfall in December
Porter, WA
- Average snowfall in December: 0.24"
The month with the highest snowfall is February (2.56").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days in December
Porter, WA
- Average snowfall days in December: 1.2 days
The month with the highest number of snowfall days is February (3.5 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
Porter, 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 18min
The months with the most sunshine are July and August (Average sunshine: 10h and 18min).
The month with the least sunshine is December (Average sunshine: 3h and 18min).
Average sunshine days in December
Porter, WA
- Average sunshine days in December: 9.1 days
The month with the most sunshine days is August (22.4 days).
The month with the least sunshine days is March (7.8 days).
Average UV index in December
Porter, 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
Porter, WA
- Average cloud cover in December: 67
The months with the most cloud cover are January and December (Cloud cover 67).
The month with the least cloud cover is July (Cloud cover 36).
Average visibility in December
Porter, WA
- Average visibility in December: 4mi
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (4mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (4mi).
