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
The coldest time of the year is December, with temperatures averaging a high of 67.3°F (19.6°C) and a low of 50.4°F (10.2°C).Humidity
With an average relative humidity of 39%, December is the most humid month in Holtville.Rainfall
In December, the rain falls for 2.1 days. Throughout December, 0.24" (6mm) of precipitation is accumulated. Throughout the year, there are 29.5 rainfall days, and 2.99" (76mm) of precipitation is accumulated.Daylight
The month with the shortest days in Holtville is December, with an average of 10h and 0min of daylight.On the first day of December, sunrise is at 6:26 am and sunset at 4:35 pm. On the last day of the month, sunrise is at 6:43 am and sunset at 4:45 pm PST.
Sunshine
The month with the least sunshine is December, with an average of 7.1h of sunshine.UV index
The month with the lowest UV index is December, with an average maximum UV index of 4. A UV Index of 3 to 5 symbolizes a medium vulnerability from unsafe exposure to UV radiation for the ordinary person.Note: The maximum daily UV index of 4 during December translates into the following directions:
Act with care - The need to guard against sun damage is communicated. Being exposed to the midday Sun can have harmful effects due to strong UV radiation; always take precautions. In bright sunlight, prioritize sunglasses that grant protection from UVA and UVB radiation.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What month is the coldest in Holtville?
What is the temperature in December in Holtville?
What is the most humid month in Holtville?
What is the average humidity in December in Holtville?
How many days does it rain in December in Holtville?
What is the month with the shortest days in Holtville?
How many hours of daylight does Holtville have in December?
What time are sunrise and sunset in December in Holtville?
What is the month with the least sunshine in Holtville?
How many hours of sunshine does Holtville have in December?
When is the lowest UV index in Holtville?
What is the UV index reading in December in Holtville?
Average temperature in December
Holtville, CA
- Average high temperature in December: 67.3°F
The warmest month (with the highest average high temperature) is July (107.2°F).
The month with the lowest average high temperature is December (67.3°F).
- Average low temperature in December: 50.4°F
The month with the highest average low temperature is August (85.6°F).
The coldest month (with the lowest average low temperature) is January (50°F).
Average pressure in December
Holtville, CA
- Average pressure in December: 30.05"Hg
The month with the highest atmospheric pressure is January (30.08"Hg).
The month with the lowest atmospheric pressure is June (29.77"Hg).
Average wind speed in December
Holtville, CA
- Average wind speed in December: 5.8mph
The windiest month (with the highest average wind speed) is April (7.7mph).
The calmest months (with the lowest average wind speed) are January and August (5.5mph).
Average humidity in December
Holtville, CA
- Average humidity in December: 39%
The month with the highest relative humidity is December (39%).
The month with the lowest relative humidity is June (21%).
Average rainfall in December
Holtville, CA
- Average rainfall in December: 0.24"
The wettest month (with the highest rainfall) is July (0.55").
The driest month (with the least rainfall) is May (0.04").
Average rainfall days in December
Holtville, CA
- Average rainfall days in December: 2.1 days
The month with the highest number of rainy days is July (6.3 days).
The month with the least rainy days is May (0.9 days).
Average daylight in December /
Average sunshine in December
Holtville, 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: 7h and 1min
The month with the most sunshine is June (Average sunshine: 12h and 12min).
The month with the least sunshine is December (Average sunshine: 7h and 6min).
Average sunshine days in December
Holtville, CA
- Average sunshine days in December: 28.5 days
The month with the most sunshine days is May (29.9 days).
The month with the least sunshine days is July (21.8 days).
Average UV index in December
Holtville, CA
- Average UV index in December: 4
The months with the highest UV index are July and August (UV index 9).
The month with the lowest UV index is December (UV index 4).
Average cloud cover in December
Holtville, CA
- Average cloud cover in December: 17
The month with the most cloud cover is December (Cloud cover 17).
The month with the least cloud cover is June (Cloud cover 5).
Average visibility in December
Holtville, 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).
Holtville, California, USA
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