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
December, with average temperatures reaching a high of 64.4°F (18°C) and a low of 49.3°F (9.6°C), is the coldest month.Humidity
The average relative humidity in December in Spring Valley is 59%.Rainfall
In Spring Valley, in December, during 3.5 rainfall days, 0.51" (13mm) of precipitation is typically accumulated. In Spring Valley, during the entire year, the rain falls for 33 days and collects up to 2.52" (64mm) of precipitation.Daylight
December has the shortest days of the year, with an average of 10h and 0min of daylight.On the first day of the month, sunrise is at 6:32 am and sunset at 4:41 pm. On the last day of December, in Spring Valley, California, sunrise is at 6:50 am and sunset at 4:52 pm PST.
Sunshine
February and December, with an average of 6.7h of sunshine, are months with the least sunshine.UV index
The months with the lowest UV index are January, February, November and December, with an average maximum UV index of 4. A UV Index reading of 3 to 5 represents a moderate threat to health from unprotected exposure to Sun's UV rays for average individuals.Note: The UV index of 4 during December translates into the following guidance:
Safety measures are advised. Light-skinned individuals may experience burns in under half an hour. Exposing oneself to the midday Sun can be harmful due to the strong UV radiation; limit your time outside. Always opt for UVA and UVB-resistant sunglasses on radiant days.
Frequently asked questions
What is the coldest time of year in Spring Valley?
What is the temperature in December in Spring Valley?
What is the average humidity in December in Spring Valley?
How much does it rain in Spring Valley in December?
What is the month with the shortest days in Spring Valley?
How many hours of daylight does Spring Valley have in December?
When is the sunrise / sunset in December in Spring Valley?
What are the months with the least sunshine in Spring Valley?
How long on average sun shines in December in Spring Valley?
When is the lowest UV index in Spring Valley?
What is the UV index intensity in December in Spring Valley?
Average temperature in December
Spring Valley, CA
- Average high temperature in December: 64.4°F
The warmest month (with the highest average high temperature) is August (82.9°F).
The month with the lowest average high temperature is December (64.4°F).
- Average low temperature in December: 49.3°F
The month with the highest average low temperature is August (65.8°F).
The coldest month (with the lowest average low temperature) is February (48.7°F).
Average pressure in December
Spring Valley, CA
- Average pressure in December: 30.06"Hg
The month with the highest atmospheric pressure is January (30.09"Hg).
The month with the lowest atmospheric pressure is June (29.87"Hg).
Average wind speed in December
Spring Valley, CA
- Average wind speed in December: 5mph
The windiest month (with the highest average wind speed) is April (5.6mph).
The calmest month (with the lowest average wind speed) is October (4.5mph).
Average humidity in December
Spring Valley, CA
- Average humidity in December: 59%
The month with the highest relative humidity is May (67%).
The month with the lowest relative humidity is November (54%).
Average rainfall in December
Spring Valley, CA
- Average rainfall in December: 0.51"
The wettest month (with the highest rainfall) is February (0.55").
The driest months (with the least rainfall) are June, July and October (0.04").
Average rainfall days in December
Spring Valley, CA
- Average rainfall days in December: 3.5 days
The month with the highest number of rainy days is March (5.3 days).
The month with the least rainy days is June (0.8 days).
Average daylight in December /
Average sunshine in December
Spring Valley, CA
- Average daylight in December: 10h and 0min
The month with the longest days is June (Average daylight: 14h and 18min).
The month with the shortest days is December (Average daylight: 10h and 0min).
- Average sunshine in December: 6h and 4min
The month with the most sunshine is July (Average sunshine: 12h and 6min).
The months with the least sunshine are February and December (Average sunshine: 6h and 42min).
Average sunshine days in December
Spring Valley, CA
- Average sunshine days in December: 26.7 days
The month with the most sunshine days is October (28.9 days).
The month with the least sunshine days is February (23.4 days).
Average UV index in December
Spring Valley, CA
- Average UV index in December: 4
The months with the highest UV index are June, July, August and September (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 4).
Average cloud cover in December
Spring Valley, CA
- Average cloud cover in December: 24
The months with the most cloud cover are March and December (Cloud cover 24).
The month with the least cloud cover is August (Cloud cover 7).
Average visibility in December
Spring Valley, 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).
Spring Valley, California, USA
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