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
In Ahtanum, December is the month with the lowest recorded average temperatures, measuring a high of 36.9°F (2.7°C) and a low of 25.5°F (-3.6°C).Humidity
In Ahtanum, the average relative humidity in December is 80%.Rainfall
In Ahtanum, in December, it is raining for 9.1 days, with typically 0.83" (21mm) of accumulated precipitation. Throughout the year, there are 82.2 rainfall days, and 5.43" (138mm) of precipitation is accumulated.Snowfall
Months with snowfall in Ahtanum are January through March, September, November and December. December is the month with the most snowfall. Snow falls for 5.4 days and accumulates 2.76" (70mm) of snow.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 7:26 am and sunset at 4:16 pm. On the last day of December, sunrise is at 7:46 am and sunset at 4:25 pm PST.
Sunshine
In December, the average sunshine is 5.9h.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 the ordinary person.Note: An average maximum UV index of 2 in December leads to these recommendations:
While most people can stay under the sun for an hour without burning, children must always be guarded against sun exposure. Considering the strength of solar radiation at midday, one should avoid direct Sun exposure. A hat with a generous brim can prevent nearly 50% of UV rays from reaching your eyes. Caution! The reflection of snow can nearly double the intensity of the Sun's UV radiation.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are the coldest months?
How cold is December?
What is the average humidity in December in Ahtanum?
How many days does it rain in December?
What is the snowiest month?
How many days does it snow in December?
What is the month with the shortest days?
How many hours of daylight does Ahtanum have in December?
When is the sunrise / sunset in December in Ahtanum?
How long on average sun shines in December in Ahtanum?
When is the lowest UV index?
How high is the UV index in December in Ahtanum?
Average temperature in December
Ahtanum, WA
- Average high temperature in December: 36.9°F
The warmest month (with the highest average high temperature) is August (86.5°F).
The month with the lowest average high temperature is December (36.9°F).
- Average low temperature in December: 25.5°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 (25.5°F).
Average pressure in December
Ahtanum, WA
- Average pressure in December: 30.14"Hg
The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is August (29.93"Hg).
Average wind speed in December
Ahtanum, WA
- Average wind speed in December: 4.4mph
The windiest month (with the highest average wind speed) is June (7.1mph).
The calmest month (with the lowest average wind speed) is December (4.4mph).
Average humidity in December
Ahtanum, WA
- Average humidity in December: 80%
The month with the highest relative humidity is January (81%).
The months with the lowest relative humidity are July and August (39%).
Average rainfall in December
Ahtanum, WA
- Average rainfall in December: 0.83"
The wettest month (with the highest rainfall) is January (0.87").
The driest month (with the least rainfall) is July (0.08").
Average rainfall days in December
Ahtanum, WA
- Average rainfall days in December: 9.1 days
The month with the highest number of rainy days is March (10.8 days).
The month with the least rainy days is August (2 days).
Average snowfall in December
Ahtanum, WA
- Average snowfall in December: 2.76"
The month with the highest snowfall is December (2.76").
The months with the least snowfall are April, May, June, July, August and October (0").
Average snowfall days in December
Ahtanum, WA
- Average snowfall days in December: 5.4 days
The month with the highest number of snowfall days is December (5.4 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
Ahtanum, WA
- Average daylight in December: 8h and 4min
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: 5h and 5min
The months with the most sunshine are July and August (Average sunshine: 12h and 6min).
The month with the least sunshine is January (Average sunshine: 5h and 36min).
Average sunshine days in December
Ahtanum, WA
- Average sunshine days in December: 17.3 days
The month with the most sunshine days is July (27.5 days).
The month with the least sunshine days is February (15.8 days).
Average UV index in December
Ahtanum, 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
Ahtanum, WA
- Average cloud cover in December: 37
The month with the most cloud cover is January (Cloud cover 40).
The months with the least cloud cover are July and August (Cloud cover 9).
Average visibility in December
Ahtanum, WA
- Average visibility in December: 6mi
The months with the highest visibility are February, March, April, May, June, July, August, September, October, November and December (6mi).
The month with the lowest visibility is January (5mi).
Ahtanum, Washington, USA
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