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 snowfall in December
- Average snowfall 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
With the arrival of December, San Juan's average high-temperature registers at a still warm 29.8°C (85.6°F), indicating a subtle variation from the previous month. San Juan reports a significant contrast between daytime and nighttime temperatures, with an average low of 17.5°C (63.5°F) in December.Humidity
In December, the average relative humidity in San Juan is 37%.Rainfall
In San Juan, Argentina, during December, the rain falls for 8.1 days and regularly aggregates up to 16mm (0.63") of precipitation. Throughout the year, there are 50.2 rainfall days, and 94mm (3.7") of precipitation is accumulated.Snowfall
January through June, October through December are months without snowfall.Daylight
December has the longest days of the year, with an average of 14h and 12min of daylight.On the first day of December in San Juan, sunrise is at 06:21 and sunset at 20:25. On the last day of the month, sunrise is at 06:32 and sunset at 20:42 -03.
Sunshine
In December, the average sunshine in San Juan is 9.8h.UV index
In December, the average daily maximum UV index is 6. A UV Index of 6 to 7 symbolizes a high health vulnerability from exposure to the Sun's UV rays for average individuals.Note: A maximum high daily UV index of 6 during December translates into the following directions:
Endorse precautions and be consistent with sun safety guidelines. Preventing sunburn is paramount. Stay in the shade and avoid direct Sun exposure from 10 a.m. to 4 p.m., a time when UV radiation is at its strongest, and remember that parasols or canopies do not offer full protection. Experience reduced UV exposure by about half when donning a wide-brim hat.
Frequently asked questions
How hot does it get in San Juan in December?
What is the average humidity in December in San Juan?
How much does it rain in San Juan in December?
When it does not snow in San Juan?
When are the longest days in San Juan?
How many hours of daylight does San Juan have in December?
When are sunrise and sunset in December in San Juan?
How long on average sun shines in December in San Juan?
What is the UV index intensity in December in San Juan?
Average temperature in December
San Juan, Argentina
- Average high temperature in December: 29.8°C
The warmest month (with the highest average high temperature) is January (30.6°C).
The month with the lowest average high temperature is July (14.6°C).
- Average low temperature in December: 17.5°C
The month with the highest average low temperature is January (19.4°C).
The coldest month (with the lowest average low temperature) is July (4.5°C).
Average pressure in December
San Juan, Argentina
- Average pressure in December: 1010.2mbar
The month with the highest atmospheric pressure is July (1018.1mbar).
The month with the lowest atmospheric pressure is December (1010.2mbar).
Average wind speed in December
San Juan, Argentina
- Average wind speed in December: 11.7km/h
The windiest months (with the highest average wind speed) are October and November (12.2km/h).
The calmest month (with the lowest average wind speed) is May (8.8km/h).
Average humidity in December
San Juan, Argentina
- Average humidity in December: 37%
The months with the highest relative humidity are April and May (52%).
The month with the lowest relative humidity is November (35%).
Average rainfall in December
San Juan, Argentina
- Average rainfall in December: 16mm
The wettest month (with the highest rainfall) is January (29mm).
The driest months (with the least rainfall) are June and July (1mm).
Average rainfall days in December
San Juan, Argentina
- Average rainfall days in December: 8.1 days
The month with the highest number of rainy days is January (9.2 days).
The month with the least rainy days is August (1.3 days).
Average snowfall in December
San Juan, Argentina
- Average snowfall in December: 0mm
The month with the highest snowfall is July (4mm).
The months with the least snowfall are January, February, March, April, May, June, October, November and December (0mm).
Average snowfall days in December
San Juan, Argentina
- Average snowfall days in December: 0 days
The months with the highest number of snowfall days are July and September (0.4 days).
The months with the least snowfall days are January, February, March, April, May, June, October, November and December (0 days).
Average daylight in December /
Average sunshine in December
San Juan, Argentina
- Average daylight in December: 14h and 1min
The month with the longest days is December (Average daylight: 14h and 12min).
The month with the shortest days is June (Average daylight: 10h and 6min).
- Average sunshine in December: 9h and 5min
The months with the most sunshine are August, September and November (Average sunshine: 9h and 54min).
The months with the least sunshine are March, April, May and October (Average sunshine: 9h and 42min).
Average sunshine days in December
San Juan, Argentina
- Average sunshine days in December: 18.5 days
The month with the most sunshine days is July (29.7 days).
The month with the least sunshine days is January (15.4 days).
Average UV index in December
San Juan, Argentina
- Average UV index in December: 6
The month with the highest UV index is January (UV index 7).
The months with the lowest UV index are May, June and July (UV index 3).
Average cloud cover in December
San Juan, Argentina
- Average cloud cover in December: 9
The months with the most cloud cover are March, April and May (Cloud cover 12).
The month with the least cloud cover is August (Cloud cover 8).
Average visibility in December
San Juan, Argentina
- Average visibility in December: 10km
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (10km).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (10km).
San Juan, Argentina
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