December weather forecast
San Juan, Argentina

Weather in December

December, the first month of the summer in San Juan, is also a moderately hot month, with an average temperature fluctuating between 29.8°C (85.6°F) and 17.5°C (63.5°F).

Temperature

In San Juan, Argentina, the average high-temperature in December is relatively the same as in November - a still moderately hot 29.8°C (85.6°F). In December, the average low-temperature is 17.5°C (63.5°F).

Humidity

In December, the average relative humidity is 37%.

Rainfall

In San Juan, during 8.1 rainfall days, 16mm (0.63") of precipitation is typically accumulated. In San Juan, during the entire year, the rain falls for 50.2 days and collects up to 94mm (3.7") of precipitation.

Snowfall

January through June, October through December are months without snowfall.

Daylight

December has the longest days of the year in San Juan, with an average of 14h and 10min of daylight.
On the first day of December in San Juan, sunrise is at 06:21 and sunset at 20:24. 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 reading of 6 to 7 represents a high health vulnerability from unsafe exposure to UV radiation for the ordinary person.
Note: The average daily UV index of 6 in December transform into the following instructions:
Take precautions and adopt sun safety practices. Protection against sunburn is obliged. The Sun's UV radiation is most powerful between 10 a.m. and 4 p.m. To the extent possible, limit exposure to the direct sun during these hours. A wide-brim hat offers excellent sun protection for the eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun.
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FAQ

What is the average humidity in December in San Juan?

In December, the average relative humidity is 37%.

How much does it rain in San Juan in December?

In San Juan, Argentina, during December, the rain falls for 8.1 days and regularly aggregates up to 16mm (0.63") of precipitation.

When it does not snow in San Juan?

January through June, October through December are months without snowfall in San Juan, Argentina.

When are the longest days in San Juan?

With an average of 14h and 10min of daylight, December has the longest days of the year.

How many hours of daylight does San Juan have in December?

In December, the average day length in San Juan, Argentina, is 14h and 10min.

What time are sunrise and sunset in December in San Juan?

On the first day of December in San Juan, sunrise is at 06:21 and sunset at 20:24. On the last day of the month, sunrise is at 06:32 and sunset at 20:42 -03.

How long on average sun shines in December in San Juan?

The average sunshine duration in December is 9.8h.

What is the UV index intensity in December in San Juan?

In December, the average daily maximum UV index is 6. A UV Index reading of 6 to 7 represents a high health risk from unprotected exposure to UV radiation.

Average temperature in December
San Juan, Argentina

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).

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Average pressure in December
San Juan, Argentina

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).

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Average wind speed in December
San Juan, Argentina

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).

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Average humidity in December
San Juan, Argentina

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%).

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Average rainfall in December
San Juan, Argentina

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).

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Average rainfall days in December
San Juan, Argentina

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).

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Average snowfall in December
San Juan, Argentina

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).

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Average snowfall days in December
San Juan, Argentina

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).

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Average daylight in December /
Average sunshine in December
San Juan, Argentina

Average daylight in December / Average sunshine in December - San Juan, Argentina
  • Average daylight in December: 14h and 10min

The month with the longest days is December (Average daylight: 14h and 10min).
The month with the shortest days is June (Average daylight: 10h and 8min).

  • Average sunshine in December: 9.8h

The months with the most sunshine are August, September and November (Average sunshine: 9.9h).
The months with the least sunshine are March, April, May and October (Average sunshine: 9.7).

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Average sunshine days in December
San Juan, Argentina

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).

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Average UV index in December
San Juan, Argentina

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).

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Average cloud cover in December
San Juan, Argentina

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).

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Average visibility in December
San Juan, Argentina

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).

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