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 snowfall 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
With average high temperatures of 60.8°F (16°C) and lows of 44.2°F (6.8°C), December is the coldest month.Humidity
The average relative humidity in December in Fontana is 51%.Rainfall
In Fontana, in December, during 5.9 rainfall days, 1.5" (38mm) of precipitation is typically accumulated. In Fontana, during the entire year, the rain falls for 48.1 days and collects up to 6.89" (175mm) of precipitation.Snowfall
In Fontana, California, snow does not fall in January, March through December.Daylight
The month with the shortest days in Fontana is December, with an average of 9h and 54min of daylight.On the first day of December, sunrise is at 6:37 am and sunset at 4:40 pm. On the last day of the month, sunrise is at 6:55 am and sunset at 4:50 pm PST.
Sunshine
The month with the least sunshine in Fontana, California, is December, with an average of 6.9h of sunshine.UV index
December is the month with the lowest UV index, with an average maximum UV index of 3. A UV Index of 3 to 5 symbolizes a moderate health risk from exposure to the Sun's UV radiation for the ordinary person.Note: The maximum UV index of 3 during December translates into these guidelines:
Undertake protective steps - Recommendations to avoid sunburn are issued. Considering the strength of solar radiation at midday, one should avoid direct Sun exposure. It's wise to wear UVA and UVB-blocking sunglasses when the sun shines brightly.
Frequently asked questions
What part of the year is the coldest in Fontana?
What are December temperatures in Fontana?
What is the average humidity in December in Fontana?
How much does it rain in Fontana in December?
When it does not snow in Fontana?
What is the month with the shortest days in Fontana?
What is the average length of the day in December in Fontana?
When are sunrise and sunset in December in Fontana?
What is the month with the least sunshine in Fontana?
How many hours of sunshine does Fontana have in December?
What is the month with the lowest UV index in Fontana?
What is the UV index reading in December in Fontana?
Average temperature in December
Fontana, CA
- Average high temperature in December: 60.8°F
The warmest month (with the highest average high temperature) is August (92.1°F).
The month with the lowest average high temperature is December (60.8°F).
- Average low temperature in December: 44.2°F
The month with the highest average low temperature is August (67.3°F).
The coldest months (with the lowest average low temperature) are February and December (44.2°F).
Average pressure in December
Fontana, CA
- Average pressure in December: 30.07"Hg
The month with the highest atmospheric pressure is January (30.1"Hg).
The month with the lowest atmospheric pressure is June (29.85"Hg).
Average wind speed in December
Fontana, CA
- Average wind speed in December: 5.3mph
The windiest months (with the highest average wind speed) are April and May (6mph).
The calmest month (with the lowest average wind speed) is September (4.5mph).
Average humidity in December
Fontana, CA
- Average humidity in December: 51%
The months with the highest relative humidity are February, March and May (52%).
The month with the lowest relative humidity is August (39%).
Average rainfall in December
Fontana, CA
- Average rainfall in December: 1.5"
The wettest month (with the highest rainfall) is February (1.57").
The driest month (with the least rainfall) is June (0.04").
Average rainfall days in December
Fontana, CA
- Average rainfall days in December: 5.9 days
The month with the highest number of rainy days is March (7.5 days).
The month with the least rainy days is June (1.2 days).
Average snowfall days in December
Fontana, CA
- Average snowfall days in December: 0 days
The month with the highest number of snowfall days is February (0.1 days).
The months with the least snowfall days are January, March, April, May, June, July, August, September, October, November and December (0 days).
Average daylight in December /
Average sunshine in December
Fontana, CA
- Average daylight in December: 9h and 5min
The month with the longest days is June (Average daylight: 14h and 24min).
The month with the shortest days is December (Average daylight: 9h and 54min).
- Average sunshine in December: 6h and 5min
The months with the most sunshine are June, July and August (Average sunshine: 12h and 6min).
The month with the least sunshine is December (Average sunshine: 6h and 54min).
Average sunshine days in December
Fontana, CA
- Average sunshine days in December: 23.8 days
The month with the most sunshine days is June (28.3 days).
The month with the least sunshine days is February (21.1 days).
Average UV index in December
Fontana, CA
- Average UV index in December: 3
The months with the highest UV index are July and August (UV index 7).
The month with the lowest UV index is December (UV index 3).
Average cloud cover in December
Fontana, CA
- Average cloud cover in December: 21
The months with the most cloud cover are February, March and December (Cloud cover 21).
The month with the least cloud cover is August (Cloud cover 4).
Average visibility in December
Fontana, 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).
Fontana, California, USA
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