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
Ukiah experiences its lowest temperatures in December, with an average peak of 36.7°F (2.6°C) and a low of 25.7°F (-3.5°C).Humidity
In December, the average relative humidity is 79%.Rainfall
In Ukiah, during December, the rain falls for 14.4 days and regularly aggregates up to 2.09" (53mm) of precipitation. In Ukiah, during the entire year, the rain falls for 145.3 days and collects up to 16.69" (424mm) of precipitation.Snowfall
Months with snowfall are January through May, September through December. In December, it is snowing for 8.3 days. Throughout December, 3.74" (95mm) of snow is accumulated. In Ukiah, during the entire year, snow falls for 30.7 days and aggregates up to 15.51" (394mm) of snow.Daylight
With an average of 8h and 48min of daylight, December has the shortest days of the year.On the first day of December, sunrise is at 7:15 am and sunset at 4:15 pm. On the last day of the month, sunrise is at 7:34 am and sunset at 4:23 pm PST.
Sunshine
In December, the average sunshine is 5.1h.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 estimate of 2, and below, represents a low threat to health from unsafe exposure to UV radiation for the ordinary person.Note: In December, the maximum UV index of 2 suggests this advice:
Most individuals can handle sun exposure for up to an hour without burning, but children must always be shielded from sun exposure. Around midday, solar radiation is most harmful; hence, exposure should be limited. Fend off the sun's harsh rays with appropriate clothing, a wide-brim hat, and UV-protective sunglasses. Be vigilant! The reflective nature of snow can increase the Sun's UV radiation nearly twofold.
Published by: Weather U.S. | 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?
How much does it rain in Ukiah in December?
How many days does it snow in December?
What is the month with the shortest days?
How many hours of daylight does Ukiah have in December?
When is the sunrise / sunset in December?
How many hours of sunshine does Ukiah have in December?
When is the lowest UV index?
How high is the UV index in December?
Average temperature in December
Ukiah, OR
- Average high temperature in December: 36.7°F
The warmest months (with the highest average high temperature) are July and August (81.5°F).
The month with the lowest average high temperature is December (36.7°F).
- Average low temperature in December: 25.7°F
The month with the highest average low temperature is August (59.5°F).
The coldest month (with the lowest average low temperature) is December (25.7°F).
Average pressure in December
Ukiah, OR
- Average pressure in December: 30.17"Hg
The month with the highest atmospheric pressure is January (30.2"Hg).
The month with the lowest atmospheric pressure is August (29.91"Hg).
Average wind speed in December
Ukiah, OR
- Average wind speed in December: 7.1mph
The windiest month (with the highest average wind speed) is April (8.3mph).
The calmest month (with the lowest average wind speed) is September (6.2mph).
Average humidity in December
Ukiah, OR
- Average humidity in December: 79%
The month with the highest relative humidity is January (80%).
The month with the lowest relative humidity is August (41%).
Average rainfall in December
Ukiah, OR
- Average rainfall in December: 2.09"
The wettest month (with the highest rainfall) is March (2.2").
The driest month (with the least rainfall) is July (0.2").
Average rainfall days in December
Ukiah, OR
- Average rainfall days in December: 14.4 days
The month with the highest number of rainy days is March (18.4 days).
The month with the least rainy days is August (3.5 days).
Average snowfall in December
Ukiah, OR
- Average snowfall in December: 3.74"
The month with the highest snowfall is February (5.24").
The months with the least snowfall are June, July and August (0").
Average snowfall days in December
Ukiah, OR
- Average snowfall days in December: 8.3 days
The month with the highest number of snowfall days is December (8.3 days).
The months with the least snowfall days are June, July and August (0 days).
Average daylight in December /
Average sunshine in December
Ukiah, OR
- Average daylight in December: 8h and 5min
The month with the longest days is June (Average daylight: 15h and 36min).
The month with the shortest days is December (Average daylight: 8h and 48min).
- Average sunshine in December: 5h and 1min
The month with the most sunshine is August (Average sunshine: 12h and 0min).
The month with the least sunshine is January (Average sunshine: 5h and 0min).
Average sunshine days in December
Ukiah, OR
- Average sunshine days in December: 11.6 days
The month with the most sunshine days is August (24.8 days).
The month with the least sunshine days is February (8.7 days).
Average UV index in December
Ukiah, OR
- Average UV index in December: 2
The month with the highest UV index is July (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover in December
Ukiah, OR
- Average cloud cover in December: 46
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 10).
Average visibility in December
Ukiah, OR
- 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).
Ukiah, Oregon, USA
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