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
San Leandro's coldest weather arrives in December, when temperatures average a high of 55.8°F (13.2°C) and a low of 44.4°F (6.9°C).Humidity
In San Leandro, the average relative humidity in December is 71%.Rainfall
In San Leandro, in December, during 8.7 rainfall days, 0.91" (23mm) of precipitation is typically accumulated. In San Leandro, California, during the entire year, the rain falls for 57.7 days and collects up to 5.71" (145mm) of precipitation.Daylight
December has the shortest days of the year, with an average of 9h and 36min of daylight.On the first day of December, sunrise is at 7:05 am and sunset at 4:50 pm. On the last day of the month, sunrise is at 7:23 am and sunset at 5:00 pm PST.
Sunshine
December has the least sunshine of the year, with an average of 5.9h 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 estimate of 3 to 5 represents a medium health hazard from unprotected exposure to Sun's UV rays for ordinary individuals.Note: The daily maximum UV index of 3 in December interprets into the following advice:
Guard yourself - Precautionary measures against sun damage are advocated. Avoiding the Sun's peak radiation during midday hours is essential for health and safety. Sunglasses that ward off UVA and UVB rays play a pivotal role in reducing solar eye damage.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What time of the year is the coldest in San Leandro?
What is the temperature in December in San Leandro?
What is the average humidity in December in San Leandro?
How many days does it rain in December in San Leandro?
What is the month with the shortest days in San Leandro?
How many hours of daylight does San Leandro have in December?
When is the sunrise / sunset in December in San Leandro?
What is the month with the least sunshine in San Leandro?
How many hours of sunshine does San Leandro have in December?
What are the months with the lowest UV index in San Leandro?
What is the UV index reading in December in San Leandro?
Average temperature in December
San Leandro, CA
- Average high temperature in December: 55.8°F
The warmest months (with the highest average high temperature) are July and September (77.7°F).
The month with the lowest average high temperature is December (55.8°F).
- Average low temperature in December: 44.4°F
The month with the highest average low temperature is September (56.5°F).
The coldest month (with the lowest average low temperature) is January (44.1°F).
Average pressure in December
San Leandro, 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
San Leandro, CA
- Average wind speed in December: 5.5mph
The windiest month (with the highest average wind speed) is May (7mph).
The calmest month (with the lowest average wind speed) is November (4.8mph).
Average humidity in December
San Leandro, CA
- Average humidity in December: 71%
The month with the highest relative humidity is March (75%).
The months with the lowest relative humidity are September and October (64%).
Average rainfall in December
San Leandro, CA
- Average rainfall in December: 0.91"
The wettest month (with the highest rainfall) is February (1.26").
The driest months (with the least rainfall) are July, August and September (0.04").
Average rainfall days in December
San Leandro, CA
- Average rainfall days in December: 8.7 days
The month with the highest number of rainy days is March (10.2 days).
The month with the least rainy days is August (0.7 days).
Average daylight in December /
Average sunshine in December
San Leandro, 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: 12h and 0min).
The month with the least sunshine is December (Average sunshine: 5h and 54min).
Average sunshine days in December
San Leandro, CA
- Average sunshine days in December: 20.6 days
The month with the most sunshine days is July (27.1 days).
The month with the least sunshine days is March (19.1 days).
Average UV index in December
San Leandro, 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
San Leandro, CA
- Average cloud cover in December: 33
The month with the most cloud cover is March (Cloud cover 34).
The month with the least cloud cover is July (Cloud cover 8).
Average visibility in December
San Leandro, 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).
San Leandro, California, USA
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