Temperatures in December
It's hot in December in San Bernardino with an average temperature of 34°C. Temperatures this month range from a low of 31°C to a high of 36°C. At night, you can expect temperatures between 21°C and 25°C.
Max and Min Temperatures per Day
This chart shows the daily maximum and minimum temperatures in degrees Celsius for San Bernardino in December. The red line indicates the max temperatures, and the blue line shows the minimums.
Start of December
The month of December starts in San Bernardino with hot temperatures, averaging around 33°C during the day and nights close to 22°C. Plenty of days with a chance of precipitation.
Mid-December
By mid-December, the average daytime temperature rises to around 34°C, with nights close to 24°C. The chance of precipitation is high during this period. Breezy clothes like shorts or a dress, plus a hat and sunglasses, are ideal.
End of December
By the end of December, the average daytime temperature in San Bernardino will be around 35°C, with nights close to 24°C. There’s regular precipitation, but with a bit of luck, you’ll also get some dry and sunny days. Breezy clothes like shorts or a dress, plus a hat and sunglasses, are ideal.
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Precipitation in December
In December, there is an average of 186 mm of precipitation, spread over 8 days. The wind speed is around 4 Bft, mostly coming from the Southeast.
The average precipitation chance is 27% per day this month. Though it seems pretty low, the weather’s variable. Some days have higher and others lower precipitation chances, which lowers the average.
Precipitation Chance
This chart shows the daily precipitation chance (in percentages) in December for San Bernardino. 0% means it never rained on that day in the past 10 years, and 100% means it rained every day. All values in between represent the average chance of precipitation on that day.
San Bernardino in December |
London | ||
|---|---|---|---|
 Average Temperature |
34°C | 9°C | |
 High Temp |
36°C | 11°C | |
| Low Temp |
31°C | 8°C | |
 Total Precipitation |
186 mm | 67 mm | |
| Rainy Days |
8 days | 10 days | |
November
UV index
The UV index is a maximum of 10 this month. That's a very high value on the intensity scale of 1 to 11. Unprotected skin can burn within 10-15 minutes.
Is December a good time to visit San Bernardino?
After some sun? Then December isn’t the best time to be in San Bernardino. The temperature is pleasant, but there’s too much chance of rain this month.
Temperature records for San Bernardino in December
With 41°C, San Bernardino hit the highest temperature in the last 10 years in December 2021. The lowest daytime temperature in this month was 23°C in 2014. The extreme night temperatures ranged from a low of 14°C to a high of 29°C.
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Daily Temperature in December in San Bernardino
This chart shows the average daily temperatures, both day and night, for each day in December in San Bernardino, measured in degrees Celsius. The red line represents the maximum temperatures, while the blue line shows the minimums. The days of the month are displayed at the bottom of the chart. The data, based on historical observations, gives an overview of the average daily temperatures during this month.
Daily Precipitation in December in San Bernardino
The chart below shows the average daily precipitation in December for San Bernardino, measured in millimetres over the past years. Precipitation is always measured as water, even if it’s snow or hail. The days of the month are shown at the bottom of the chart.
A low average precipitation means that the chance of rain on that day is usually small, while a higher average suggests that rain is more likely. But it’s still an average, so each day can be different. Based on historical weather data for December, you can expect around 8 days of rain in San Bernardino.
Daily UV Index in December in San Bernardino
This chart shows the average daily UV index in December in San Bernardino, with the UV index ranging from 0 to a maximum of 11. The bottom of the chart shows the days of the month. Based on historical data, this chart provides an idea of the daily UV radiation levels you can expect.
Temperature in December in San Bernardino Over the Years
This chart shows the average temperature in December in San Bernardino, measured in degrees Celsius, over the past years.
Total Precipitation in December in San Bernardino Over the Years
This chart shows the average precipitation in December in San Bernardino, measured in millimetres over the past years. Precipitation is always measured as water, even if it’s snow or hail.
Daily climate in December for San Bernardino
Click on a specific day in December for detailed info on the typical weather on that day in San Bernardino. Check out the historical temperatures and precipitation over the past 10 years on this day.
Weather experiences in December in San Bernardino
Have you been to San Bernardino in December?
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Average Weather in San Bernardino by Month
Click on a month below to see detailed weather info for San Bernardino. Based on historical weather data, you can see the average temperature, precipitation, wind, and UV index for each day of the month.
Or check out the climate of San Bernardino for all months at once
