December weather forecastSappho, WA
December
Weather in December
The first month of the winter, December, is also a wintry month in Sappho, Washington, with an average temperature ranging between min 36.3°F (2.4°C) and max 42.4°F (5.8°C).Temperature
The coldest temperatures occur during December, when averages reach a peak of 42.4°F (5.8°C) and a low of 36.3°F (2.4°C).Humidity
The months with the highest humidity are January and December, with an average relative humidity of 87%.Rainfall
In Sappho, in December, it is raining for 15.9 days, with typically 3.27" (83mm) of accumulated precipitation. In Sappho, during the entire year, the rain falls for 142.6 days and collects up to 19.61" (498mm) of precipitation.Snowfall
Months with snowfall in Sappho are January through April, September and December. December is the first month it typically snows in Sappho. Throughout December, in the average 0.8 snowfall days, it receives 0.12" (3mm) of snow. In Sappho, during the entire year, snow falls for 5.1 days and aggregates up to 2.17" (55mm) of snow.Daylight
The month with the shortest days is December, with an average of 8h and 24min of daylight.On the first day of the month, sunrise is at 7:47 am and sunset at 4:25 pm. On the last day of December, in Sappho, sunrise is at 8:07 am and sunset at 4:33 pm PST.
Sunshine
The average sunshine in December is 4h.UV index
January, February, November and December, with an average maximum UV index of 2, are months with the lowest UV index in Sappho. A UV Index of 2, and less, symbolizes a minimal health vulnerability from unprotected exposure to Sun's UV rays for the average person.Note: During December, 2 as the daily maximum UV index converts into the following advice:
Children necessitate constant protection from sunlight, unlike the majority, who can remain under the sun for about an hour without burning. Given the potency of the midday Sun's UV radiation, one should avoid prolonged exposure. Shield yourself from the harmful effects of UV radiation with sun-protective attire, a hat, and quality sunglasses. 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
Sappho, WA
- Average high temperature in December: 42.4°F
The warmest month (with the highest average high temperature) is August (67.6°F).
The month with the lowest average high temperature is December (42.4°F).
- Average low temperature in December: 36.3°F
The month with the highest average low temperature is August (50.7°F).
The coldest month (with the lowest average low temperature) is February (36°F).
Average pressure in December
Sappho, WA
- Average pressure in December: 30.03"Hg
The month with the highest atmospheric pressure is July (30.07"Hg).
The month with the lowest atmospheric pressure is March (29.98"Hg).
Average wind speed in December
Sappho, WA
- Average wind speed in December: 6.6mph
The windiest month (with the highest average wind speed) is January (7.4mph).
The calmest month (with the lowest average wind speed) is August (3.9mph).
Average humidity in December
Sappho, WA
- Average humidity in December: 87%
The months with the highest relative humidity are January and December (87%).
The months with the lowest relative humidity are May, July and August (80%).
Average rainfall in December
Sappho, WA
- Average rainfall in December: 3.27"
The wettest month (with the highest rainfall) is January (3.66").
The driest month (with the least rainfall) is July (0.28").
Average rainfall days in December
Sappho, WA
- Average rainfall days in December: 15.9 days
The month with the highest number of rainy days is November (16.5 days).
The month with the least rainy days is August (5.1 days).
Average snowfall in December
Sappho, WA
- Average snowfall in December: 0.12"
The month with the highest snowfall is January (1.14").
The months with the least snowfall are May, June, July, August, October and November (0").
Average snowfall days in December
Sappho, WA
- Average snowfall days in December: 0.8 days
The month with the highest number of snowfall days is February (1.9 days).
The months with the least snowfall days are May, June, July, August and October (0 days).
Average daylight in December /
Average sunshine in December
Sappho, WA
- Average daylight in December: 8h and 24min
The month with the longest days is June (Average daylight: 16h and 0min).
The month with the shortest days is December (Average daylight: 8h and 24min).
- Average sunshine in December: 4h and 0min
The months with the most sunshine are July and August (Average sunshine: 10h and 18min).
The month with the least sunshine is January (Average sunshine: 3h and 42min).
Average sunshine days in December
Sappho, WA
- Average sunshine days in December: 12.2 days
The month with the most sunshine days is July (23 days).
The month with the least sunshine days is November (11.7 days).
Average UV index in December
Sappho, WA
- Average UV index in December: 2
The months with the highest UV index are June, July and August (UV index 4).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover in December
Sappho, WA
- Average cloud cover in December: 58
The month with the most cloud cover is January (Cloud cover 61).
The month with the least cloud cover is August (Cloud cover 32).
Average visibility in December
Sappho, WA
- Average visibility in December: 6mi
The months with the highest visibility are February, March, April, October, November and December (6mi).
The months with the lowest visibility are January, May, June, July, August and September (5mi).
