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
December
Weather in December
Temperature
The advent of December brings an average high-temperature of a moderately hot 23.4°C (74.1°F), exhibiting minor difference from the previous month. Throughout December, San Juan experiences a low-temperature average of 14°C (57.2°F).Humidity
In San Juan, the average relative humidity in December is 84%.Rainfall
In December, in San Juan, the rain falls for 19.5 days. Throughout December, 65mm (2.56") of precipitation is accumulated. Throughout the year, there are 287.8 rainfall days, and 2585mm (101.77") of precipitation is accumulated.Daylight
The month with the shortest days is December, with an average of 11h and 36min of daylight.On the first day of December in San Juan, 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
In December, the average sunshine is 7.8h.UV index
The months with the highest UV index in San Juan, Costa Rica, are January through December, with an average maximum UV index of 5. The months with the lowest UV index in San Juan are January through December, with an average maximum UV index of 5. A UV Index of 3 to 5 symbolizes a moderate health risk from exposure to the Sun's UV rays for the ordinary person.Note: The daily high UV index of 5 during December translates into the following recommendations:
Make use of precautions - It is urged to ward off sun damage. The Sun's most harmful UV rays are emitted around midday; avoid staying outdoors for long during this time. Employ a hat with a wide brim for robust protection, cutting UV exposure by half.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the temperature in December in San Juan?
What is the average humidity in December in San Juan?
How many days does it rain in December in San Juan?
What is the month with the shortest days in San Juan?
What is the average length of the day in December in San Juan?
What time are sunrise and sunset in December in San Juan?
How long on average sun shines in December in San Juan?
What is the month with the highest UV index in San Juan?
When is the lowest UV index in San Juan?
What is the UV index intensity in December in San Juan?
Average temperature in December
San Juan, Costa Rica
- Average high temperature in December: 23.4°C
The warmest month (with the highest average high temperature) is April (26°C).
The month with the lowest average high temperature is October (22.4°C).
- Average low temperature in December: 14°C
The month with the highest average low temperature is June (17°C).
The coldest month (with the lowest average low temperature) is January (13.8°C).
Average pressure in December
San Juan, Costa Rica
- Average pressure in December: 1011.7mbar
The month with the highest atmospheric pressure is January (1012.3mbar).
The month with the lowest atmospheric pressure is October (1010.8mbar).
Average wind speed in December
San Juan, Costa Rica
- Average wind speed in December: 9km/h
The windiest month (with the highest average wind speed) is February (10.7km/h).
The calmest month (with the lowest average wind speed) is September (4.3km/h).
Average humidity in December
San Juan, Costa Rica
- Average humidity in December: 84%
The months with the highest relative humidity are September and October (91%).
The months with the lowest relative humidity are February and March (75%).
Average rainfall in December
San Juan, Costa Rica
- Average rainfall in December: 65mm
The wettest month (with the highest rainfall) is October (438mm).
The driest month (with the least rainfall) is February (26mm).
Average rainfall days in December
San Juan, Costa Rica
- Average rainfall days in December: 19.5 days
The month with the highest number of rainy days is October (30.5 days).
The month with the least rainy days is February (12.2 days).
Average daylight in December /
Average sunshine in December
San Juan, 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: 7h and 5min
The month with the most sunshine is February (Average sunshine: 9h and 12min).
The month with the least sunshine is October (Average sunshine: 5h and 48min).
Average sunshine days in December
San Juan, Costa Rica
- Average sunshine days in December: 9.1 days
The month with the most sunshine days is March (13.5 days).
The month with the least sunshine days is September (0.1 days).
Average UV index in December
San Juan, Costa Rica
- Average UV index in December: 5
The months with the highest UV index are January, February, March, April, May, June, July, August, September, October, November and December (UV index 5).
The months with the lowest UV index are January, February, March, April, May, June, July, August, September, October, November and December (UV index 5).
Average cloud cover in December
San Juan, Costa Rica
- Average cloud cover in December: 45
The month with the most cloud cover is October (Cloud cover 68).
The month with the least cloud cover is February (Cloud cover 30).
Average visibility in December
San Juan, Costa Rica
- Average visibility in December: 8km
The months with the highest visibility are January, February and March (9km).
The months with the lowest visibility are August, September, October and November (6km).
