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
In Princeton, December is the coldest month, with temperatures averaging a high of 54.5°F (12.5°C) and a low of 42.1°F (5.6°C).Humidity
In December, the average relative humidity in Princeton is 67%.Rainfall
The months with the most rainfall in Princeton are February and December, with an average 1.3" (33mm) of precipitation.Daylight
December has the shortest days of the year in Princeton, with an average of 9h and 24min of daylight.On the first day of the month, sunrise is at 7:09 am and sunset at 4:45 pm. On the last day of December, sunrise is at 7:27 am and sunset at 4:54 pm PST.
Sunshine
The month with the least sunshine is December, with an average of 5.8h of sunshine.UV index
February, November and December, with an average maximum UV index of 3, are months with the lowest UV index. A UV Index of 3 to 5 symbolizes a moderate threat to health from unprotected exposure to Sun's UV rays for the average person.Note: The maximum UV index of 3 during December leads to these instructions:
Heed the precautions - It is counselled to guard against solar damage. Limiting exposure to the direct Sun during midday hours can help prevent harmful UV radiation effects. To mitigate harm from sun exposure, pick sunglasses offering UVA and UVB defense.
Frequently asked questions
What is the coldest month in Princeton?
What are December temperatures in Princeton?
What is the average humidity in December in Princeton?
What is the wettest month in Princeton?
How much does it rain in Princeton in December?
What is the month with the shortest days in Princeton?
What is the average length of the day in December in Princeton?
What time are sunrise and sunset in December in Princeton?
What is the month with the least sunshine in Princeton?
How long on average sun shines in December in Princeton?
What is the month with the lowest UV index in Princeton?
What is the UV index intensity in December in Princeton?
Average temperature in December
Princeton, CA
- Average high temperature in December: 54.5°F
The warmest month (with the highest average high temperature) is July (98.8°F).
The month with the lowest average high temperature is December (54.5°F).
- Average low temperature in December: 42.1°F
The month with the highest average low temperature is July (61.5°F).
The coldest month (with the lowest average low temperature) is December (42.1°F).
Average pressure in December
Princeton, CA
- Average pressure in December: 30.12"Hg
The month with the highest atmospheric pressure is January (30.15"Hg).
The month with the lowest atmospheric pressure is June (29.9"Hg).
Average wind speed in December
Princeton, CA
- Average wind speed in December: 5.9mph
The windiest month (with the highest average wind speed) is March (6.6mph).
The calmest month (with the lowest average wind speed) is August (5mph).
Average humidity in December
Princeton, CA
- Average humidity in December: 67%
The month with the highest relative humidity is March (71%).
The month with the lowest relative humidity is September (36%).
Average rainfall in December
Princeton, CA
- Average rainfall in December: 1.3"
The wettest months (with the highest rainfall) are February and December (1.3").
The driest months (with the least rainfall) are July and August (0.04").
Average rainfall days in December
Princeton, CA
- Average rainfall days in December: 7.6 days
The month with the highest number of rainy days is March (10.4 days).
The month with the least rainy days is July (1 days).
Average daylight in December /
Average sunshine in December
Princeton, CA
- Average daylight in December: 9h and 2min
The month with the longest days is June (Average daylight: 14h and 54min).
The month with the shortest days is December (Average daylight: 9h and 24min).
- Average sunshine in December: 5h and 5min
The month with the most sunshine is July (Average sunshine: 12h and 6min).
The month with the least sunshine is December (Average sunshine: 5h and 48min).
Average sunshine days in December
Princeton, CA
- Average sunshine days in December: 22.5 days
The month with the most sunshine days is July (29.8 days).
The month with the least sunshine days is March (19.7 days).
Average UV index in December
Princeton, CA
- Average UV index in December: 3
The months with the highest UV index are June, July and August (UV index 7).
The months with the lowest UV index are February, November and December (UV index 3).
Average cloud cover in December
Princeton, CA
- Average cloud cover in December: 36
The months with the most cloud cover are March and December (Cloud cover 36).
The month with the least cloud cover is July (Cloud cover 4).
Average visibility in December
Princeton, 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).
Princeton, California, USA
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