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
With average temperatures fluctuating between a high of 42.3°F (5.7°C) and a low of 34.7°F (1.5°C), December stands out as the coldest month.Humidity
January and December, with an average relative humidity of 85%, are the most humid months in John Sam Lake.Rainfall
In December, in John Sam Lake, the rain falls for 19.3 days. Throughout December, 3.82" (97mm) of precipitation is accumulated. In John Sam Lake, during the entire year, the rain falls for 179.1 days and collects up to 29.57" (751mm) of precipitation.Snowfall
Months with snowfall are January through April, November and December. In John Sam Lake, during December, snow falls for 1.5 days and regularly aggregates up to 0.51" (13mm) of snow. In John Sam Lake, during the entire year, snow falls for 8.9 days and aggregates up to 6.1" (155mm) of snow.Daylight
With an average of 8h and 24min of daylight, December has the shortest days of the year.On the first day of December, sunrise is at 7:39 am and sunset at 4:17 pm. On the last day of the month, sunrise is at 7:59 am and sunset at 4:25 pm PST.
Sunshine
The months with the least sunshine are January and December, with an average of 4.2h of sunshine.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 of 2, and less, symbolizes a minimal health vulnerability from exposure to the Sun's UV radiation for ordinary individuals.Note: In December, the maximum UV index of 2 suggests these recommendations:
Despite the majority tolerating prolonged sun exposure, those with sensitive skin, infants, and children demand continual protection. Given the potency of the midday Sun's UV radiation, one should avoid prolonged exposure. By wearing a generously brimmed hat, you can cut UV radiation exposure significantly. Take warning! The intensity of the Sun's UV radiation can be nearly amplified twice due to snow reflection.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the coldest month?
Is it cold during December?
What is the most humid month?
What is the average humidity in December?
How many days does it rain in December?
How many days does it snow in December?
What is the month with the shortest days?
How many hours of daylight does John Sam Lake have in December?
When is the sunrise / sunset in December in John Sam Lake?
What is the month with the least sunshine?
How long on average sun shines in December?
When is the lowest UV index?
What is the UV index intensity in December?
Average temperature in December
John Sam Lake, WA
- Average high temperature in December: 42.3°F
The warmest month (with the highest average high temperature) is August (73°F).
The month with the lowest average high temperature is December (42.3°F).
- Average low temperature in December: 34.7°F
The month with the highest average low temperature is August (52.5°F).
The coldest month (with the lowest average low temperature) is December (34.7°F).
Average pressure in December
John Sam Lake, WA
- Average pressure in December: 30.08"Hg
The month with the highest atmospheric pressure is January (30.09"Hg).
The month with the lowest atmospheric pressure is August (30"Hg).
Average wind speed in December
John Sam Lake, WA
- Average wind speed in December: 5.4mph
The windiest months (with the highest average wind speed) are March and November (5.8mph).
The calmest month (with the lowest average wind speed) is August (3.5mph).
Average humidity in December
John Sam Lake, WA
- Average humidity in December: 85%
The months with the highest relative humidity are January and December (85%).
The month with the lowest relative humidity is July (73%).
Average rainfall in December
John Sam Lake, WA
- Average rainfall in December: 3.82"
The wettest month (with the highest rainfall) is November (4.06").
The driest month (with the least rainfall) is July (0.47").
Average rainfall days in December
John Sam Lake, WA
- Average rainfall days in December: 19.3 days
The month with the highest number of rainy days is March (19.8 days).
The month with the least rainy days is August (6.1 days).
Average snowfall in December
John Sam Lake, WA
- Average snowfall in December: 0.51"
The month with the highest snowfall is February (2.68").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in December
John Sam Lake, WA
- Average snowfall days in December: 1.5 days
The month with the highest number of snowfall days is February (3.1 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
John Sam Lake, WA
- Average daylight in December: 8h and 2min
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 1min
The month with the most sunshine is August (Average sunshine: 10h and 36min).
The months with the least sunshine are January and December (Average sunshine: 4h and 12min).
Average sunshine days in December
John Sam Lake, WA
- Average sunshine days in December: 10.1 days
The month with the most sunshine days is August (23.1 days).
The months with the least sunshine days are February and November (8.6 days).
Average UV index in December
John Sam Lake, 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
John Sam Lake, WA
- Average cloud cover in December: 57
The month with the most cloud cover is December (Cloud cover 57).
The month with the least cloud cover is August (Cloud cover 26).
Average visibility in December
John Sam Lake, WA
- Average visibility in December: 5mi
The months with the highest visibility are March, April, May, June, July, August, September and October (6mi).
The months with the lowest visibility are January, February, November and December (5mi).
John Sam Lake, Washington, USA
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