December weather forecastGuatay, CA
December
Weather in December
The first month of the winter, December, is still a mild month in Guatay, California, with temperature in the range of an average low of 41.9°F (5.5°C) and an average high of 58.1°F (14.5°C).Temperature
Guatay's December weather, with an average high temperature of 58.1°F (14.5°C) and an average low temperature of 41.9°F (5.5°C), tends to be the coldest of the year.Humidity
The average relative humidity in December is 54%.Rainfall
In Guatay, in December, during 6.5 rainfall days, 1.06" (27mm) of precipitation is typically accumulated. Throughout the year, in Guatay, there are 67.3 rainfall days, and 9.57" (243mm) of precipitation is accumulated.Snowfall
January through March, November and December are months with snowfall. In Guatay, in December, snow falls for 0.5 days, with typically accumulated 0.63" (16mm) of snow. Throughout the year, there are 2.5 snowfall days, and 1.73" (44mm) of snow is accumulated.Daylight
The month with the shortest days is December, with an average of 10h and 0min of daylight.On the first day of the month, sunrise is at 6:31 am and sunset at 4:39 pm. On the last day of December, sunrise is at 6:48 am and sunset at 4:50 pm PST.
Sunshine
With an average of 6.4h of sunshine, December has the least sunshine of the year.UV index
January, February, November and December, with an average maximum UV index of 3, are months with the lowest UV index. A UV Index reading of 3 to 5 represents a moderate threat to health from unsafe exposure to UV radiation for the average person.Note: The maximum daily UV index of 3 in December interprets into the following recommendations:
Put precautions into practice - Guidance to elude sunburn is provided. Midday is when the Sun's radiation is strongest; avoid prolonged exposure during this time. Opt for tightly woven and loose clothing to enhance protection from the Sun. Be advised! The UV radiation from the Sun can be almost doubled due to the reflective properties of snow.
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Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Guatay, CA
- Average high temperature in December: 58.1°F
The warmest month (with the highest average high temperature) is August (89.2°F).
The month with the lowest average high temperature is December (58.1°F).
- Average low temperature in December: 41.9°F
The month with the highest average low temperature is August (66.4°F).
The coldest month (with the lowest average low temperature) is December (41.9°F).
Average pressure in December
Guatay, CA
- Average pressure in December: 30.06"Hg
The month with the highest atmospheric pressure is January (30.08"Hg).
The months with the lowest atmospheric pressure are June and September (29.85"Hg).
Average wind speed in December
Guatay, CA
- Average wind speed in December: 7mph
The windiest months (with the highest average wind speed) are April and May (7.2mph).
The calmest month (with the lowest average wind speed) is August (5.1mph).
Average humidity in December
Guatay, CA
- Average humidity in December: 54%
The months with the highest relative humidity are March and May (55%).
The month with the lowest relative humidity is August (43%).
Average rainfall in December
Guatay, CA
- Average rainfall in December: 1.06"
The wettest month (with the highest rainfall) is February (1.69").
The driest month (with the least rainfall) is June (0.08").
Average rainfall days in December
Guatay, CA
- Average rainfall days in December: 6.5 days
The month with the highest number of rainy days is July (8.6 days).
The month with the least rainy days is June (1.8 days).
Average snowfall in December
Guatay, CA
- Average snowfall in December: 0.63"
The month with the highest snowfall is February (0.83").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days in December
Guatay, CA
- Average snowfall days in December: 0.5 days
The month with the highest number of snowfall days is February (1.2 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average daylight in December /
Average sunshine in December
Guatay, 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 24min
The month with the most sunshine is June (Average sunshine: 12h and 6min).
The month with the least sunshine is December (Average sunshine: 6h and 24min).
Average sunshine days in December
Guatay, CA
- Average sunshine days in December: 23.3 days
The month with the most sunshine days is June (27.7 days).
The month with the least sunshine days is July (18.8 days).
Average UV index in December
Guatay, CA
- Average UV index in December: 3
The months with the highest UV index are July and August (UV index 7).
The months with the lowest UV index are January, February, November and December (UV index 3).
Average cloud cover in December
Guatay, CA
- Average cloud cover in December: 28
The month with the most cloud cover is December (Cloud cover 28).
The months with the least cloud cover are June and August (Cloud cover 7).
Average visibility in December
Guatay, 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).
