December weather forecast
Puerto Iguazú, Argentina

Welcoming the height of summer, December experiences the highest daytime temperatures of the year, hitting averages of 31°C (87.8°F). Accompanied by the warmth of the day, the temperatures at night remain moderate, cooling to about 19.8°C (67.6°F). Puerto Iguazú braces for a slight reduction in relative humidity, falling to 73%. Despite recording a slightly lower average rainfall of 212mm (8.35"), December benefits from the highest daylight hours of the year at 13.7 hours, extending time for outdoor activities and leisure. Sunshine hours reach a high of 6.7 hours per day, adding to the vibrancy of the festive season.

Temperature

A minor adjustment in Puerto Iguazú's average high-temperature is noted with the start of December, touching a tropical 31°C (87.8°F) from November's 29.9°C (85.8°F). Throughout December nights, Puerto Iguazú experiences a consistent temperature average of 19.8°C (67.6°F).

Heat index

For most parts of December, the heat index is appraised at a very hot 39°C (102.2°F). Heightened safety actions are necessary, heat cramps and heat exhaustion are probable. Persistent activity may lead to heatstroke.
The metrics for the heat index are tailored for both shady environments and light winds. Direct sunlight can potentially boost the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature' or 'real feel', is an index that combines air temperature and relative humidity to determine the human-perceived temperature equivalent. The individual's temperature perception can be influenced by numerous factors such as metabolic variations, physical activity, and clothing. Take note that direct exposure to the sun can increase the felt temperature, possibly adding 15 Fahrenheit (8 Celsius) degrees to the heat index. Heat index values are largely significant for babies and toddlers. Children often overlook the need for breaks and fluid intake. Thirst is a late-stage sign of dehydration - hence, it is necessary to stay hydrated, especially during extended periods of physical activities.
The evaporation of sweat is a natural cooling mechanism of the human body, facilitated by perspiration. When the air contains significant moisture, the efficiency of the evaporation process decreases, preventing the body from cooling down effectively and creating a feeling of overheating. Excessive heat that's not properly managed leads to increased body temperatures and resultant health issues.

Humidity

The least humid month in Puerto Iguazú is December, with an average relative humidity of 73%.

Rainfall

In December, the rain falls for 9 days. Throughout December, 212mm (8.35") of precipitation is accumulated. Throughout the year, in Puerto Iguazú, there are 98.5 rainfall days, and 1899mm (74.76") of precipitation is accumulated.

Daylight

With an average of 13h and 42min of daylight, December has the longest days of the year.
On the first day of December in Puerto Iguazú, sunrise is at 05:38 and sunset at 19:16. On the last day of the month, sunrise is at 05:50 and sunset at 19:32 -03.

Sunshine

With an average of 6.7h of sunshine, December has the most sunshine of the year.