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 average high-temperature in San Francisco is a still warm 26.5°C (79.7°F) in December, hardly different from the 25.9°C (78.6°F) recorded in November. San Francisco experiences an average low-temperature of 17.2°C (63°F) in the month of December.Humidity
The average relative humidity in December in San Francisco, Costa Rica, is 81%.Rainfall
In December, the rain falls for 18.3 days. Throughout December, 46mm (1.81") of precipitation is accumulated. Throughout the year, in San Francisco, Costa Rica, there are 272 rainfall days, and 2217mm (87.28") of precipitation is accumulated.Daylight
December has the shortest days of the year in San Francisco, Costa Rica, with an average of 11h and 36min of daylight.On the first day of December, sunrise is at 05:38 and sunset at 17:13. On the last day of the month, sunrise is at 05:52 and sunset at 17:26 CST.
Sunshine
The average sunshine in December is 8.7h.UV index
January through April, June, July, September, October and December, with an average maximum UV index of 6, are months with the highest UV index in San Francisco. A UV Index reading of 6 to 7 represents a high health vulnerability from exposure to the Sun's UV rays for the average person.Note: The maximum UV index of 6 during December translates into these guidelines:
Persist with safeguards and heed sun safety doctrines. Keeping sunburn at bay is of prime importance. UV radiation from the Sun is most intense between 10 a.m. and 4 p.m. Try to avoid direct sunlight during this period. For holistic sun protection encompassing the eyes, ears, face, and neck, a wide-brim hat is key.
Frequently asked questions
What are the temperatures in San Francisco in December?
What is the average humidity in December in San Francisco?
How much does it rain in San Francisco in December?
What is the month with the shortest days in San Francisco?
How many hours of daylight does San Francisco have in December?
When are sunrise and sunset in December in San Francisco?
How long on average sun shines in December in San Francisco?
What are the months with the highest UV index in San Francisco?
How high is the UV index in December in San Francisco?
Average temperature in December
San Francisco, Costa Rica
- Average high temperature in December: 26.5°C
The warmest months (with the highest average high temperature) are March and April (29.7°C).
The month with the lowest average high temperature is October (25.4°C).
- Average low temperature in December: 17.2°C
The month with the highest average low temperature is May (19.8°C).
The coldest month (with the lowest average low temperature) is January (16.8°C).
Average pressure in December
San Francisco, Costa Rica
- Average pressure in December: 1011.5mbar
The month with the highest atmospheric pressure is January (1012.1mbar).
The month with the lowest atmospheric pressure is October (1010.7mbar).
Average wind speed in December
San Francisco, Costa Rica
- Average wind speed in December: 8.7km/h
The windiest month (with the highest average wind speed) is February (10.6km/h).
The calmest month (with the lowest average wind speed) is September (3.8km/h).
Average humidity in December
San Francisco, Costa Rica
- Average humidity in December: 81%
The month with the highest relative humidity is October (89%).
The month with the lowest relative humidity is March (70%).
Average rainfall in December
San Francisco, Costa Rica
- Average rainfall in December: 46mm
The wettest month (with the highest rainfall) is October (396mm).
The driest month (with the least rainfall) is February (17mm).
Average rainfall days in December
San Francisco, Costa Rica
- Average rainfall days in December: 18.3 days
The month with the highest number of rainy days is October (30.2 days).
The month with the least rainy days is February (10.3 days).
Average daylight in December /
Average sunshine in December
San Francisco, Costa Rica
- Average daylight in December: 11h and 4min
The month with the longest days is June (Average daylight: 12h and 42min).
The month with the shortest days is December (Average daylight: 11h and 36min).
- Average sunshine in December: 8h and 4min
The month with the most sunshine is March (Average sunshine: 9h and 24min).
The month with the least sunshine is October (Average sunshine: 7h and 0min).
Average sunshine days in December
San Francisco, Costa Rica
- Average sunshine days in December: 10.1 days
The month with the most sunshine days is January (16.7 days).
The month with the least sunshine days is September (0.5 days).
Average UV index in December
San Francisco, Costa Rica
- Average UV index in December: 6
The months with the highest UV index are January, February, March, April, June, July, September, October and December (UV index 6).
The months with the lowest UV index are May, August and November (UV index 5).
Average cloud cover in December
San Francisco, Costa Rica
- Average cloud cover in December: 33
The month with the most cloud cover is October (Cloud cover 54).
The month with the least cloud cover is February (Cloud cover 19).
Average visibility in December
San Francisco, Costa Rica
- Average visibility in December: 9km
The months with the highest visibility are February and March (10km).
The months with the lowest visibility are August, September, October and November (7km).
San Francisco, Costa Rica
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