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 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 of the year, registering average temperatures as high as 55.6°F (13.1°C) and as low as 42.4°F (5.8°C).Humidity
In December, the average relative humidity in Rohnert Park is 74%.Rainfall
In Rohnert Park, in December, it is raining for 6.4 days, with typically 0.67" (17mm) of accumulated precipitation. Throughout the year, there are 44.3 rainfall days, and 3.78" (96mm) of precipitation is accumulated.Daylight
December has the shortest days of the year, with an average of 9h and 30min of daylight.On the first day of the month, sunrise is at 7:09 am and sunset at 4:50 pm. On the last day of December, in Rohnert Park, sunrise is at 7:27 am and sunset at 5:00 pm PST.
Sunshine
With an average of 5.7h of sunshine, December has the least sunshine of the year.UV index
January, February, November and December, with an average maximum UV index of 3, are months with the lowest UV index. A UV Index estimate of 3 to 5 represents a medium health hazard from unsafe exposure to UV radiation for average individuals.Note: In December, the maximum UV index of 3 suggests these recommendations:
Ensure safety - Recommendations to avert sunburn are presented. The Sun's most harmful UV rays are emitted around midday; avoid staying outdoors for long during this time. Using UVA and UVB-protective sunglasses and sun-protective clothing is effective against UV radiation.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What time of the year is the coldest in Rohnert Park?
What are the temperatures in Rohnert Park in December?
What is the average humidity in December in Rohnert Park?
How much does it rain in Rohnert Park in December?
What is the month with the shortest days in Rohnert Park?
How many hours of daylight does Rohnert Park have in December?
When are sunrise and sunset in December in Rohnert Park?
What is the month with the least sunshine in Rohnert Park?
How long on average sun shines in December in Rohnert Park?
What are the months with the lowest UV index in Rohnert Park?
What is the UV index intensity in December in Rohnert Park?
Average temperature in December
Rohnert Park, CA
- Average high temperature in December: 55.6°F
The warmest months (with the highest average high temperature) are July and August (79.9°F).
The month with the lowest average high temperature is December (55.6°F).
- Average low temperature in December: 42.4°F
The months with the highest average low temperature are August and September (55°F).
The coldest month (with the lowest average low temperature) is December (42.4°F).
Average pressure in December
Rohnert Park, CA
- Average pressure in December: 30.11"Hg
The month with the highest atmospheric pressure is January (30.13"Hg).
The months with the lowest atmospheric pressure are June, August and September (29.92"Hg).
Average wind speed in December
Rohnert Park, CA
- Average wind speed in December: 5.2mph
The windiest month (with the highest average wind speed) is May (6.8mph).
The calmest month (with the lowest average wind speed) is November (4.7mph).
Average humidity in December
Rohnert Park, CA
- Average humidity in December: 74%
The month with the highest relative humidity is March (77%).
The month with the lowest relative humidity is September (62%).
Average rainfall in December
Rohnert Park, CA
- Average rainfall in December: 0.67"
The wettest month (with the highest rainfall) is February (0.91").
The driest months (with the least rainfall) are June, July, August and September (0.04").
Average rainfall days in December
Rohnert Park, CA
- Average rainfall days in December: 6.4 days
The month with the highest number of rainy days is March (8.7 days).
The month with the least rainy days is August (0.5 days).
Average daylight in December /
Average sunshine in December
Rohnert Park, CA
- Average daylight in December: 9h and 3min
The month with the longest days is June (Average daylight: 14h and 48min).
The month with the shortest days is December (Average daylight: 9h and 30min).
- Average sunshine in December: 5h and 4min
The month with the most sunshine is July (Average sunshine: 11h and 54min).
The month with the least sunshine is December (Average sunshine: 5h and 42min).
Average sunshine days in December
Rohnert Park, CA
- Average sunshine days in December: 22.5 days
The month with the most sunshine days is June (27.7 days).
The month with the least sunshine days is March (20.8 days).
Average UV index in December
Rohnert Park, CA
- Average UV index in December: 3
The month with the highest UV index is June (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 3).
Average cloud cover in December
Rohnert Park, CA
- Average cloud cover in December: 37
The month with the most cloud cover is March (Cloud cover 38).
The month with the least cloud cover is July (Cloud cover 9).
Average visibility in December
Rohnert Park, CA
- 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).
Rohnert Park, California, USA
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