December weather forecastProsser, WA
December
Weather in December
December, the first month of the winter in Prosser, is also a wintry month, with temperature in the range of an average low of 27°F (-2.8°C) and an average high of 37.2°F (2.9°C).Temperature
In Prosser, the month of December registers the lowest temperatures, averaging 37.2°F (2.9°C) at the peak and 27°F (-2.8°C) at the lowest.Humidity
In Prosser, Washington, the average relative humidity in December is 79%.Rainfall
The months with the most rainfall are January and December, with an average 0.94" (24mm) of precipitation.Snowfall
January through March, September, November and December are months with snowfall in Prosser. In Prosser, during December, snow falls for 4.6 days and regularly aggregates up to 1.57" (40mm) of snow. Throughout the year, there are 13.5 snowfall days, and 5.87" (149mm) of snow is accumulated.Daylight
The month with the shortest days is December, with an average of 8h and 42min of daylight.On the first day of the month, sunrise is at 7:22 am and sunset at 4:14 pm. On the last day of December, sunrise is at 7:41 am and sunset at 4:23 pm PST.
Sunshine
The average sunshine in December in Prosser, Washington, is 5.5h.UV index
The months with the lowest UV index in Prosser are January, February, November and December, with an average maximum UV index of 2. A UV Index estimate of 2, and below, represents a low threat to health from unsafe exposure to UV radiation for ordinary individuals.Note: A daily high UV index of 2 in December leads to these guidelines:
Babies, children, and individuals with sensitive skin should always have protection against extended sun exposure. It's recommended to limit sun exposure when its radiation is at its peak during midday. For a sun-safe wardrobe, go for clothes that are tightly woven and generously sized. Be alert! Nearly double the UV rays from the Sun can be reflected by snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Prosser, WA
- Average high temperature in December: 37.2°F
The warmest month (with the highest average high temperature) is July (88.3°F).
The month with the lowest average high temperature is December (37.2°F).
- Average low temperature in December: 27°F
The month with the highest average low temperature is August (63.1°F).
The coldest month (with the lowest average low temperature) is December (27°F).
Average pressure in December
Prosser, WA
- Average pressure in December: 30.15"Hg
The month with the highest atmospheric pressure is January (30.18"Hg).
The month with the lowest atmospheric pressure is August (29.91"Hg).
Average wind speed in December
Prosser, WA
- Average wind speed in December: 5.6mph
The windiest month (with the highest average wind speed) is April (8.6mph).
The calmest month (with the lowest average wind speed) is December (5.6mph).
Average humidity in December
Prosser, WA
- Average humidity in December: 79%
The month with the highest relative humidity is January (81%).
The months with the lowest relative humidity are July and August (37%).
Average rainfall in December
Prosser, WA
- Average rainfall in December: 0.94"
The wettest months (with the highest rainfall) are January and December (0.94").
The driest month (with the least rainfall) is July (0.2").
Average rainfall days in December
Prosser, WA
- Average rainfall days in December: 9.7 days
The month with the highest number of rainy days is March (11.8 days).
The month with the least rainy days is July (3.6 days).
Average snowfall in December
Prosser, WA
- Average snowfall in December: 1.57"
The month with the highest snowfall is February (2.01").
The months with the least snowfall are April, May, June, July, August and October (0").
Average snowfall days in December
Prosser, WA
- Average snowfall days in December: 4.6 days
The month with the highest number of snowfall days is December (4.6 days).
The months with the least snowfall days are April, May, June, July, August and October (0 days).
Average daylight in December /
Average sunshine in December
Prosser, WA
- Average daylight in December: 8h and 42min
The month with the longest days is June (Average daylight: 15h and 42min).
The month with the shortest days is December (Average daylight: 8h and 42min).
- Average sunshine in December: 5h and 30min
The months with the most sunshine are July and August (Average sunshine: 12h and 0min).
The month with the least sunshine is January (Average sunshine: 5h and 12min).
Average sunshine days in December
Prosser, WA
- Average sunshine days in December: 16.5 days
The month with the most sunshine days is July (25.8 days).
The month with the least sunshine days is February (15.5 days).
Average UV index in December
Prosser, WA
- Average UV index in December: 2
The month with the highest UV index is July (UV index 7).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover in December
Prosser, WA
- Average cloud cover in December: 44
The month with the most cloud cover is January (Cloud cover 46).
The month with the least cloud cover is July (Cloud cover 9).
Average visibility in December
Prosser, WA
- Average visibility in December: 6mi
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
