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
Temperature records mark December as the coldest month, with highs averaging 55.6°F (13.1°C) and lows at 41.9°F (5.5°C).Humidity
In December, the average relative humidity is 75%.Rainfall
In December, in Graton, the rain falls for 10.5 days. Throughout December, 2.24" (57mm) of precipitation is accumulated. Throughout the year, in Graton, there are 72.8 rainfall days, and 12.01" (305mm) of precipitation is accumulated.Daylight
December has the shortest days of the year in Graton, with an average of 9h and 30min of daylight.On the first day of December, sunrise is at 7:10 am and sunset at 4:51 pm. On the last day of the month, sunrise is at 7:28 am and sunset at 5:01 pm PST.
Sunshine
The month with the least sunshine in Graton is December, with an average of 5.7h of sunshine.UV index
The months with the lowest UV index are January, February, November and December, with an average maximum UV index of 3. A UV Index of 3 to 5 symbolizes a moderate health risk from exposure to the Sun's UV rays for ordinary individuals.Note: The UV index of 3 during December leads to these advisories:
Undertake protective steps - Preventing sun damage is advised. Avoiding the Sun during its peak radiation time around midday is a healthy practice. It's wise to wear UVA and UVB-blocking sunglasses when the sun shines brightly.
Frequently asked questions
What is the coldest month in Graton?
What are December temperatures in Graton?
What is the average humidity in December in Graton?
How much does it rain in Graton in December?
What is the month with the shortest days in Graton?
How many hours of daylight does Graton have in December?
When is the sunrise / sunset in December in Graton?
What is the month with the least sunshine in Graton?
How many hours of sunshine does Graton have in December?
When is the lowest UV index in Graton?
What is the UV index intensity in December in Graton?
Average temperature in December
Graton, CA
- Average high temperature in December: 55.6°F
The warmest month (with the highest average high temperature) is August (79.7°F).
The month with the lowest average high temperature is December (55.6°F).
- Average low temperature in December: 41.9°F
The months with the highest average low temperature are August and September (54.7°F).
The coldest month (with the lowest average low temperature) is December (41.9°F).
Average pressure in December
Graton, CA
- Average pressure in December: 30.1"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
Graton, CA
- Average wind speed in December: 5.2mph
The windiest month (with the highest average wind speed) is May (7.1mph).
The calmest month (with the lowest average wind speed) is November (4.9mph).
Average humidity in December
Graton, CA
- Average humidity in December: 75%
The month with the highest relative humidity is March (77%).
The month with the lowest relative humidity is September (63%).
Average rainfall in December
Graton, CA
- Average rainfall in December: 2.24"
The wettest month (with the highest rainfall) is February (2.64").
The driest months (with the least rainfall) are July and August (0.04").
Average rainfall days in December
Graton, CA
- Average rainfall days in December: 10.5 days
The month with the highest number of rainy days is March (12.6 days).
The month with the least rainy days is August (0.8 days).
Average daylight in December /
Average sunshine in December
Graton, 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
Graton, CA
- Average sunshine days in December: 19.5 days
The month with the most sunshine days is July (27.2 days).
The month with the least sunshine days is March (17.1 days).
Average UV index in December
Graton, 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
Graton, CA
- Average cloud cover in December: 37
The month with the most cloud cover is March (Cloud cover 39).
The month with the least cloud cover is July (Cloud cover 9).
Average visibility in December
Graton, 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).
Graton, California, USA
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