Contents
- Weather in December
- Frequently asked questions
- Average temperature in December
- Average pressure in December
- Average wind speed in December
- Average humidity in December
- Average rainfall in December
- Average rainfall days in December
- Average snowfall in December
- Average snowfall days in December
- Average daylight in December
- Average sunshine in December
- Average sunshine days in December
- Average UV index in December
- Average cloud cover in December
- Average visibility in December
Weather in December
Temperature
December is the coldest month, with the temperature often reaching an average high of 36.5°F (2.5°C) and an average low of 25.7°F (-3.5°C).Humidity
In Dayton, the average relative humidity in December is 80%.Rainfall
The month with the most rainfall is December, when the rain falls for 13.6 days and typically aggregates up to 2.05" (52mm) of precipitation.Snowfall
Months with snowfall are January through May, September, November and December. In Dayton, during December, snow falls for 7.6 days and regularly aggregates up to 3.31" (84mm) of snow. In Dayton, Washington, during the entire year, snow falls for 28.4 days and aggregates up to 13.58" (345mm) of snow.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 7:15 am and sunset at 4:07 pm. On the last day of December, sunrise is at 7:34 am and sunset at 4:15 pm PST.
Sunshine
In Dayton, the average sunshine in December is 5.3h.UV index
The months with the lowest UV index are January, February, November and December, with an average maximum UV index of 2. A UV Index estimate of 2, and below, represents a minimal health vulnerability from exposure to the Sun's UV rays for average individuals.Note: A maximum daily UV index of 2 during December morphs into the following directions:
Extended sun exposure is not an issue for the majority. Children, infants, and fair-skinned individuals always need to be protected. Limiting exposure to the direct Sun during midday hours can help prevent harmful UV radiation effects. For effective sun eye protection, rely on sunglasses certified for UVA and UVB resistance. Watch out! The Sun's UV radiation can be nearly magnified twofold due to snow reflection.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What time of the year is the coldest?
How cold is December?
What is the average humidity in December?
What is the wettest month in Dayton?
How many days does it rain in December?
How much does it snow in December?
What is the month with the shortest days?
How many hours of daylight does Dayton have in December?
What time are sunrise and sunset in December?
How long on average sun shines in December?
What is the month with the lowest UV index?
What is the UV index intensity in December?
Average temperature in December
Dayton, WA
- Average high temperature in December: 36.5°F
The warmest month (with the highest average high temperature) is August (83.7°F).
The month with the lowest average high temperature is December (36.5°F).
- Average low temperature in December: 25.7°F
The month with the highest average low temperature is August (60.3°F).
The coldest month (with the lowest average low temperature) is December (25.7°F).
Average pressure in December
Dayton, 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 (29.9"Hg).
Average wind speed in December
Dayton, WA
- Average wind speed in December: 6.8mph
The windiest month (with the highest average wind speed) is April (8.6mph).
The calmest month (with the lowest average wind speed) is September (6.3mph).
Average humidity in December
Dayton, WA
- Average humidity in December: 80%
The month with the highest relative humidity is January (81%).
The month with the lowest relative humidity is August (39%).
Average rainfall in December
Dayton, WA
- Average rainfall in December: 2.05"
The wettest month (with the highest rainfall) is December (2.05").
The driest months (with the least rainfall) are July and August (0.35").
Average rainfall days in December
Dayton, WA
- Average rainfall days in December: 13.6 days
The month with the highest number of rainy days is March (17.6 days).
The month with the least rainy days is July (5.3 days).
Average snowfall in December
Dayton, WA
- Average snowfall in December: 3.31"
The month with the highest snowfall is February (4.53").
The months with the least snowfall are June, July, August and October (0").
Average snowfall days in December
Dayton, WA
- Average snowfall days in December: 7.6 days
The month with the highest number of snowfall days is February (7.7 days).
The months with the least snowfall days are June, July and August (0 days).
Average daylight in December /
Average sunshine in December
Dayton, WA
- Average daylight in December: 8h and 4min
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 2min
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 6min).
Average sunshine days in December
Dayton, WA
- Average sunshine days in December: 12.8 days
The month with the most sunshine days is July (24 days).
The month with the least sunshine days is February (10 days).
Average UV index in December
Dayton, 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
Dayton, WA
- Average cloud cover in December: 45
The months with the most cloud cover are January and February (Cloud cover 47).
The months with the least cloud cover are July and August (Cloud cover 11).
Average visibility in December
Dayton, 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).
Dayton, Washington, USA
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