December weather forecastTracy, CA
December
Weather in December
December, the first month of the winter in Tracy, is also a fresh month, with an average temperature varying between 54.1°F (12.3°C) and 40.1°F (4.5°C).Temperature
Tracy's coldest month, December, generally records average temperatures ranging from a high of 54.1°F (12.3°C) to a low of 40.1°F (4.5°C).Humidity
In December, the average relative humidity is 72%.Rainfall
In Tracy, in December, during 8.1 rainfall days, 0.94" (24mm) of precipitation is typically accumulated. Throughout the year, there are 60.6 rainfall days, and 5.71" (145mm) of precipitation is accumulated.Snowfall
December is the only month when snow falls in Tracy. December has the most snowfall days of the year in Tracy. Snow falls for 0.1 days.Daylight
The month with the shortest days in Tracy is December, with an average of 9h and 36min of daylight.On the first day of December, sunrise is at 7:02 am and sunset at 4:47 pm. On the last day of the month, sunrise is at 7:20 am and sunset at 4:57 pm PST.
Sunshine
December has the least sunshine of the year, with an average of 5.8h of sunshine.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 of 3 to 5 symbolizes a moderate threat to health from exposure to the Sun's UV rays for the ordinary person.Note: In December, the UV index of 3 transforms into the following advice:
Put precautions into practice - Protective measures against sun-induced damage are advised. UV radiation from the Sun is most dangerous during midday; take precautions and seek shade. Combat UV radiation's detrimental effects with sun-safe clothing and UV-blocking eyewear. Mind this! Nearly twice the UV radiation from the Sun can be reflected by the snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Tracy, CA
- Average high temperature in December: 54.1°F
The warmest month (with the highest average high temperature) is July (92.5°F).
The month with the lowest average high temperature is December (54.1°F).
- Average low temperature in December: 40.1°F
The month with the highest average low temperature is August (58.6°F).
The coldest months (with the lowest average low temperature) are January and December (40.1°F).
Average pressure in December
Tracy, CA
- Average pressure in December: 30.11"Hg
The month with the highest atmospheric pressure is January (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).
Average wind speed in December
Tracy, CA
- Average wind speed in December: 5.1mph
The windiest month (with the highest average wind speed) is June (7.1mph).
The calmest month (with the lowest average wind speed) is November (4.5mph).
Average humidity in December
Tracy, CA
- Average humidity in December: 72%
The month with the highest relative humidity is January (74%).
The month with the lowest relative humidity is July (45%).
Average rainfall in December
Tracy, CA
- Average rainfall in December: 0.94"
The wettest month (with the highest rainfall) is March (1.06").
The driest months (with the least rainfall) are June and August (0.08").
Average rainfall days in December
Tracy, CA
- Average rainfall days in December: 8.1 days
The month with the highest number of rainy days is March (10.6 days).
The month with the least rainy days is August (1.2 days).
Average snowfall days in December
Tracy, CA
- Average snowfall days in December: 0.1 days
The month with the highest number of snowfall days is December (0.1 days).
The months with the least snowfall days are January, February, March, April, May, June, July, August, September, October and November (0 days).
Average daylight in December /
Average sunshine in December
Tracy, CA
- Average daylight in December: 9h and 36min
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 48min
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
Tracy, CA
- Average sunshine days in December: 21.5 days
The month with the most sunshine days is August (28.6 days).
The month with the least sunshine days is March (18.4 days).
Average UV index in December
Tracy, CA
- Average UV index in December: 3
The month with the highest UV index is July (UV index 7).
The months with the lowest UV index are January, February, November and December (UV index 3).
Average cloud cover in December
Tracy, CA
- Average cloud cover in December: 35
The month with the most cloud cover is March (Cloud cover 36).
The months with the least cloud cover are July and August (Cloud cover 5).
Average visibility in December
Tracy, 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).
