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
Nine Mile Falls experiences its lowest average temperatures in December, reaching a peak of 32.2°F (0.1°C) and a minimum of 22.1°F (-5.5°C).Humidity
In December, the average relative humidity is 86%.Rainfall
In Nine Mile Falls, in December, during 9.6 rainfall days, 2.09" (53mm) of precipitation is typically accumulated. Throughout the year, there are 127.8 rainfall days, and 16.93" (430mm) of precipitation is accumulated.Snowfall
Months with snowfall are January through May, September through December. In Nine Mile Falls, during December, snow falls for 15.6 days and regularly aggregates up to 8.74" (222mm) of snow. In Nine Mile Falls, during the entire year, snow falls for 62.3 days and aggregates up to 37.83" (961mm) of snow.Daylight
The month with the shortest days is December, with an average of 8h and 30min of daylight.On the first day of the month, sunrise is at 7:19 am and sunset at 4:00 pm. On the last day of December, sunrise is at 7:38 am and sunset at 4:08 pm PST.
Sunshine
The month with the least sunshine is December, with an average of 3.9h of sunshine.UV index
The months with the lowest UV index are February and December, with an average maximum UV index of 1. A UV Index estimate of 2, and below, represents a low health risk from exposure to the Sun's UV radiation for average individuals.Note: The maximum daily UV index of 1 during December translates into the following directions:
Babies, children, and individuals with sensitive skin should always have protection against extended sun exposure. Around midday, solar radiation is most harmful; hence, exposure should be limited. To mitigate harm from sun exposure, pick sunglasses offering UVA and UVB defense. Be cautious! The UV radiation from the Sun can be magnified almost twofold by snow reflection.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the coldest time of year?
How cold is it in December?
What is the average humidity in December?
How much does it rain in December?
How much does it snow in December?
What is the month with the shortest days in Nine Mile Falls?
How many hours of daylight does Nine Mile Falls have in December?
When are sunrise and sunset in December?
What is the month with the least sunshine?
How many hours of sunshine does Nine Mile Falls have in December?
When is the lowest UV index?
What is the UV index intensity in December?
Average temperature in December
Nine Mile Falls, WA
- Average high temperature in December: 32.2°F
The warmest months (with the highest average high temperature) are July and August (83.7°F).
The month with the lowest average high temperature is December (32.2°F).
- Average low temperature in December: 22.1°F
The month with the highest average low temperature is August (59°F).
The coldest month (with the lowest average low temperature) is December (22.1°F).
Average pressure in December
Nine Mile Falls, 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
Nine Mile Falls, WA
- Average wind speed in December: 5.8mph
The windiest month (with the highest average wind speed) is April (7.3mph).
The calmest month (with the lowest average wind speed) is August (5.7mph).
Average humidity in December
Nine Mile Falls, WA
- Average humidity in December: 86%
The month with the highest relative humidity is January (89%).
The month with the lowest relative humidity is August (38%).
Average rainfall in December
Nine Mile Falls, WA
- Average rainfall in December: 2.09"
The wettest month (with the highest rainfall) is March (2.13").
The driest month (with the least rainfall) is August (0.35").
Average rainfall days in December
Nine Mile Falls, WA
- Average rainfall days in December: 9.6 days
The month with the highest number of rainy days is April (16.3 days).
The month with the least rainy days is July (4.9 days).
Average snowfall in December
Nine Mile Falls, WA
- Average snowfall in December: 8.74"
The month with the highest snowfall is January (10.39").
The months with the least snowfall are June, July and August (0").
Average snowfall days in December
Nine Mile Falls, WA
- Average snowfall days in December: 15.6 days
The month with the highest number of snowfall days is December (15.6 days).
The months with the least snowfall days are June, July and August (0 days).
Average daylight in December /
Average sunshine in December
Nine Mile Falls, WA
- Average daylight in December: 8h and 3min
The month with the longest days is June (Average daylight: 15h and 54min).
The month with the shortest days is December (Average daylight: 8h and 30min).
- Average sunshine in December: 3h and 5min
The month with the most sunshine is August (Average sunshine: 12h and 0min).
The month with the least sunshine is December (Average sunshine: 3h and 54min).
Average sunshine days in December
Nine Mile Falls, WA
- Average sunshine days in December: 12 days
The month with the most sunshine days is July (24.1 days).
The month with the least sunshine days is March (9.8 days).
Average UV index in December
Nine Mile Falls, WA
- Average UV index in December: 1
The month with the highest UV index is July (UV index 7).
The months with the lowest UV index are February and December (UV index 1).
Average cloud cover in December
Nine Mile Falls, WA
- Average cloud cover in December: 59
The months with the most cloud cover are January and December (Cloud cover 59).
The months with the least cloud cover are July and August (Cloud cover 13).
Average visibility in December
Nine Mile Falls, WA
- Average visibility in December: 4mi
The months with the highest visibility are March, April, May, June, July, August, September, October and November (6mi).
The months with the lowest visibility are January and December (4mi).
Nine Mile Falls, Washington, USA
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