December weather forecastCastroville, CA
December
Weather in December
The first month of the winter, December, is still a mild month in Castroville, California, with temperature in the range of an average high of 57.6°F (14.2°C) and an average low of 43.7°F (6.5°C).Temperature
December brings the lowest temperatures, with an average high of 57.6°F (14.2°C) and an average low of 43.7°F (6.5°C).Humidity
In Castroville, the average relative humidity in December is 71%.Rainfall
The month with the most rainfall is December, when the rain falls for 7.7 days and typically aggregates up to 1.14" (29mm) of precipitation.Daylight
The month with the shortest days in Castroville is December, with an average of 9h and 42min of daylight.On the first day of December, sunrise is at 7:01 am and sunset at 4:50 pm. On the last day of the month, sunrise is at 7:19 am and sunset at 5:01 pm PST.
Sunshine
December has the least sunshine of the year, with an average of 6h of sunshine.UV index
The months with the lowest UV index are February, November and December, with an average maximum UV index of 3. A UV Index of 3 to 5 symbolizes a moderate threat to health from unprotected exposure to Sun's UV rays for ordinary individuals.Note: A maximum high UV index of 3 in December translates into the following recommendations:
Be mindful. Individuals with a lighter skin tone may suffer burns in less than 30 minutes. Given the potency of the midday Sun's UV radiation, one should avoid prolonged exposure. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Castroville, CA
- Average high temperature in December: 57.6°F
The warmest month (with the highest average high temperature) is August (76.6°F).
The month with the lowest average high temperature is December (57.6°F).
- Average low temperature in December: 43.7°F
The month with the highest average low temperature is September (54.5°F).
The coldest month (with the lowest average low temperature) is December (43.7°F).
Average pressure in December
Castroville, CA
- Average pressure in December: 30.11"Hg
The month with the highest atmospheric pressure is January (30.13"Hg).
The month with the lowest atmospheric pressure is September (29.92"Hg).
Average wind speed in December
Castroville, CA
- Average wind speed in December: 5.3mph
The windiest month (with the highest average wind speed) is May (6.5mph).
The calmest month (with the lowest average wind speed) is September (4.9mph).
Average humidity in December
Castroville, CA
- Average humidity in December: 71%
The month with the highest relative humidity is March (75%).
The month with the lowest relative humidity is October (66%).
Average rainfall in December
Castroville, CA
- Average rainfall in December: 1.14"
The wettest month (with the highest rainfall) is December (1.14").
The driest months (with the least rainfall) are June, July, August and September (0.04").
Average rainfall days in December
Castroville, CA
- Average rainfall days in December: 7.7 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
Castroville, CA
- Average daylight in December: 9h and 42min
The month with the longest days is June (Average daylight: 14h and 36min).
The month with the shortest days is December (Average daylight: 9h and 42min).
- Average sunshine in December: 6h
The months with the most sunshine are July and August (Average sunshine: 12h).
The month with the least sunshine is December (Average sunshine: 6h).
Average sunshine days in December
Castroville, CA
- Average sunshine days in December: 22.2 days
The month with the most sunshine days is August (29.8 days).
The month with the least sunshine days is March (20 days).
Average UV index in December
Castroville, CA
- Average UV index in December: 3
The months with the highest UV index are June, July, August and September (UV index 5).
The months with the lowest UV index are February, November and December (UV index 3).
Average cloud cover in December
Castroville, CA
- Average cloud cover in December: 32
The month with the most cloud cover is March (Cloud cover 33).
The months with the least cloud cover are July and September (Cloud cover 10).
Average visibility in December
Castroville, 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).
