San Luis
Argentina
Long-term weather forecast
Long-term weather forecast

December weather forecast and climate
San Luis, Argentina

The first month of the summer, December, is also a moderately hot month in San Luis, Argentina, with temperature in the range of an average low of 18.5°C (65.3°F) and an average high of 29.5°C (85.1°F).

Temperature

In San Luis, the average high-temperature in December is almost the same as in November - a still moderately hot 29.5°C (85.1°F). In San Luis, the average low-temperature is 18.5°C (65.3°F).

Heat index

In December, the average heat index is calculated to 29.5°C (85.1°F). Exhaustion is likely with prolonged exposure and activity. Sustaining activity may result in heat cramps.
Take into consideration that the heat index values are calculated for shade and light wind conditions. Exposure to direct sunshine can increase heat index values by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel', 'felt air temperature', 'feels like', or 'apparent temperature', is an index that combines air temperature and relative humidity to determine the human-perceived temperature equivalent. Additional factors like activity, metabolic differences, clothing, and differences in body mass, height, and shape affect individual temperature impact. Be aware that direct exposure to sunlight increases heat impact, and may raise the heat index additionally, by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are especially crucial for babies and toddlers. Children are often less aware of the need to rest and re-hydrate. Thirst is a late sign of dehydration - it is vital to remain hydrated, particularly during prolonged physical activities.

Humidity

The least humid month in San Luis, Argentina, is December, with an average relative humidity of 43%.

Rainfall

In San Luis, during 13.4 rainfall days, 49mm (1.93") of precipitation is typically accumulated. In San Luis, during the entire year, the rain falls for 102.6 days and collects up to 350mm (13.78") of precipitation.

Snowfall

January through May, October through December are months without snowfall in San Luis.

Daylight

The month with the longest days in San Luis is December, with an average of 14.3h of daylight.

Sunshine

Months with the most sunshine in San Luis are January and December, with an average of 9.6h of sunshine.

UV index

Months with the highest UV index are January, February, October through December, with an average maximum UV index of 6. A UV Index reading of 6 to 7 represents a high health hazard from the exposure to the Sun's UV radiation for the average person.
Note: The daily maximum UV index of 6 in December interpret into the following advice:
Take precautions against overexposure. Protection against sun damage is needed. Seek shade and minimize exposure to direct Sun in a period between 10 a.m. and 4 p.m. when UV radiation is most intense; keep in mind that shade structures like parasols or canopies do not provide perfect sun protection. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes.

What is the temperature in December in San Luis?

The average high-temperature, in December, in San Luis, is 29.5°C (85.1°F), while the average low-temperature is 18.5°C (65.3°F). The average heat index (a.k.a. 'felt air temperature', 'real feel'), that represents influence of the relative humidity to air temperaure, in December is calculated to 29.5°C (85.1°F).

What is the least humid month in San Luis?

December is the least humid month in San Luis, Argentina, with an average relative humidity of 43%.

What is the average humidity in December in San Luis?

In San Luis, Argentina, the average relative humidity in December is 43%.

How many days does it rain in December in San Luis?

In San Luis, in December, during 13.4 rainfall days, 49mm (1.93") of precipitation is typically accumulated.

When it does not snow in San Luis?

January through May, October through December are months without snowfall in San Luis.

When are the longest days in San Luis?

December has the longest days of the year in San Luis, Argentina, with an average of 14.3h of daylight.

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

In December, the average length of the day in San Luis is 14.3h.

What is the month with the most sunshine in San Luis?

January and December, with an average of 9.6h of sunshine, are months with the most sunshine in San Luis, Argentina.

How many hours of sunshine does San Luis have in December?

The average sunshine in December in San Luis, Argentina, is 9.6h.

What are the months with the highest UV index in San Luis?

January, February, October through December, with an average maximum UV index of 6, are months with the highest UV index.

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

In San Luis, the average daily maximum UV index in December is 6. A UV Index reading of 6 to 7 represents a high health vulnerability from the exposure to the Sun's UV radiation.
Average temperature in December - San Luis, Argentina
  • Average high temperature in December: 29.5°C

The warmest month (with the highest average high temperature) is January (31°C).
The month with the lowest average high temperature is July (14.6°C).

  • Average low temperature in December: 18.5°C

The month with the highest average low temperature is January (20.1°C).
The coldest month (with the lowest average low temperature) is July (5.9°C).

Average humidity in December - San Luis, Argentina
  • Average humidity in December: 43%

The month with the highest relative humidity is May (63%).
The month with the lowest relative humidity is December (43%).

Average rainfall in December - San Luis, Argentina
  • Average rainfall in December: 49mm

The wettest month (with the highest rainfall) is January (59mm).
Driest months (with the lowest rainfall) are July and August (2mm).

Average rainfall days in December - San Luis, Argentina
  • Average rainfall days in December: 13.4 days

The month with the highest number of rainy days is November (14.2 days).
The month with the lowest number of rainy days is August (1.7 days).

Average snowfall in December - San Luis, Argentina
  • Average snowfall in December: 0mm

The month with the highest snowfall is June (6mm).
Months with the lowest snowfall are January, February, March, April, May, October, November and December (0mm).

Average snowfall days in December - San Luis, Argentina
  • Average snowfall days in December: 0 days

The month with the highest number of snowfall days is July (0.5 days).
Months with the lowest number of snowfall days are January, February, March, April, May, October, November and December (0 days).

Average daylight in December / Average sunshine in December - San Luis, Argentina
  • Average daylight in December: 14.3h

The month with the longest days is December (Average daylight: 14.3h).
The month with shortest days is June (Average daylight: 10h).

  • Average sunshine in December: 9.6h

Months with most sunshine are January and December (Average sunshine: 9.6h).
The month with least sunshine is May (Average sunshine: 9h).

Average UV index in December - San Luis, Argentina
  • Average UV index in December: 6

Months with the highest UV index are January, February, October, November and December (UV index 6).
Months with the lowest UV index are May and June (UV index 3).