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 55.4°F (13°C) and lows at 44.6°F (7°C).Humidity
The average relative humidity in December is 71%.Rainfall
In December, the rain falls for 7.5 days. Throughout December, 0.87" (22mm) of precipitation is accumulated. Throughout the year, in Piedmont, there are 55.6 rainfall days, and 5.24" (133mm) of precipitation is accumulated.Daylight
The month with the shortest days in Piedmont is December, with an average of 9h and 36min of daylight.On the first day of December, sunrise is at 7:06 am and sunset at 4:50 pm. On the last day of the month, sunrise is at 7:24 am and sunset at 5:00 pm PST.
Sunshine
The month with the least sunshine in Piedmont, California, is December, with an average of 5.8h of sunshine.UV index
The months with the lowest UV index in Piedmont are January, February, November and December, with an average maximum UV index of 3. A UV Index of 3 to 5 symbolizes a medium health hazard from exposure to the Sun's UV radiation for the ordinary person.Note: In December, the UV index of 3 transforms into the following advice:
Adopt protective measures - It is advised to guard against sun damage. Protect yourself from the midday Sun's peak UV radiation by minimizing exposure. On sunny days, it's ideal to wear sunglasses that filter out UVA and UVB rays.
Frequently asked questions
What part of the year is the coldest in Piedmont?
What is the usual temperature for Piedmont in December?
What is the average humidity in December in Piedmont?
How many days does it rain in December in Piedmont?
What is the month with the shortest days in Piedmont?
What is the average length of the day in December in Piedmont?
When are sunrise and sunset in December in Piedmont?
What is the month with the least sunshine in Piedmont?
How long on average sun shines in December in Piedmont?
What is the month with the lowest UV index in Piedmont?
What is the UV index reading in December in Piedmont?
Average temperature in December
Piedmont, CA
- Average high temperature in December: 55.4°F
The warmest month (with the highest average high temperature) is September (76.6°F).
The month with the lowest average high temperature is December (55.4°F).
- Average low temperature in December: 44.6°F
The month with the highest average low temperature is September (56.8°F).
The coldest month (with the lowest average low temperature) is January (44.2°F).
Average pressure in December
Piedmont, 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
Piedmont, CA
- Average wind speed in December: 5.7mph
The windiest month (with the highest average wind speed) is May (7.3mph).
The calmest month (with the lowest average wind speed) is November (5mph).
Average humidity in December
Piedmont, CA
- Average humidity in December: 71%
The month with the highest relative humidity is March (75%).
The month with the lowest relative humidity is October (64%).
Average rainfall in December
Piedmont, CA
- Average rainfall in December: 0.87"
The wettest month (with the highest rainfall) is February (1.1").
The driest months (with the least rainfall) are June, July, August and September (0.08").
Average rainfall days in December
Piedmont, CA
- Average rainfall days in December: 7.5 days
The month with the highest number of rainy days is March (8.7 days).
The month with the least rainy days is August (1.5 days).
Average daylight in December /
Average sunshine in December
Piedmont, CA
- Average daylight in December: 9h and 4min
The month with the longest days is June (Average daylight: 14h and 42min).
The month with the shortest days is December (Average daylight: 9h and 36min).
- Average sunshine in December: 5h and 5min
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 48min).
Average sunshine days in December
Piedmont, CA
- Average sunshine days in December: 22.1 days
The month with the most sunshine days is October (26 days).
The month with the least sunshine days is February (20.5 days).
Average UV index in December
Piedmont, CA
- Average UV index in December: 3
The months with the highest UV index are April, May, June, July, August and September (UV index 5).
The months with the lowest UV index are January, February, November and December (UV index 3).
Average cloud cover in December
Piedmont, CA
- Average cloud cover in December: 35
The month with the most cloud cover is March (Cloud cover 36).
The month with the least cloud cover is July (Cloud cover 11).
Average visibility in December
Piedmont, 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).
Piedmont, California, USA
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