December weather forecast
Rosario, Argentina

December brings full-blown summer to Rosario with the hottest weather of the year featuring temperatures reaching 31.7°C (89.1°F). The longest days of the year are recorded in this month, with day time reaching a maximum of 14.3 hours. Despite being the hottest month, Rosario experiences the heaviest rainfall at 72mm (2.83"), offering a refreshing counter to the high temperatures. The UV index peaks at 6, resulting in very strong sunlight for the longest period during the year. As the year comes to an end, Rosario prepares itself for a weather cycle anew.

Temperature

The shift from November to December in Rosario sees a slight increase in the average high-temperature, transitioning from a warm 28.5°C (83.3°F) to a hot 31.7°C (89.1°F). Nighttime temperatures in Rosario exhibit a substantial dip from daytime highs during December, averaging at an enjoyable 17.5°C (63.5°F).

Heat index

The average heat index in December is computed to be a torrid 35°C (95°F). Undertake extra safety actions, heat cramps and heat exhaustion are expected. Heatstroke may result from lengthy activity.
The heat index's values are generally associated with conditions in shade and light breezes. The heat index might be elevated by 15 Fahrenheit (8 Celsius) degrees due to direct sun exposure.
Note: The heat index, also known as 'real feel' or 'feels like', is a measure of how hot it feels when the actual air humidity is factored in. Additional elements encompassing metabolic differences, the degree of physical activity, and attire can impact the individual's perception of temperature. You should know that direct sun exposure can heighten weather effects, potentially elevating the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are highly critical for babies and toddlers. Youngsters are usually more at risk than adults, considering they sweat less. Additionally, their high skin surface area compared to their little bodies and their high heat production due to activity increases their risk.
The primary way humans combat excessive warmth is by perspiring, letting sweat evaporate and cool the body. When relative humidity is heightened, it slows the rate of evaporation, thereby decreasing the body's ability to shed heat and creating a sensation of overheating. When body temperature rises due to excess heat gain beyond its removal capability, one might experience heat-related disorders.

Humidity

The average relative humidity in December is 54%.

Rainfall

The month with the most rainfall in Rosario is December, when the rain falls for 9.1 days and typically aggregates up to 72mm (2.83") of precipitation.

Daylight

With an average of 14h and 18min of daylight, December has the longest days of the year in Rosario.
On the first day of December in Rosario, sunrise is at 05:46 and sunset at 19:56. On the last day of the month, sunrise is at 05:57 and sunset at 20:14 -03.

Sunshine

The month with the most sunshine is December, with an average of 11.1h of sunshine.

UV index

In December, the average daily maximum UV index is 6. A UV Index value of 6 to 7 symbolizes a high threat to health from unprotected exposure to Sun's UV rays for average individuals.
Note: In December, the maximum UV index of 6 transforms into these recommendations:
Prevent overexposure. Protection from the sun's harmful effects is needed. 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. Sunglasses that guard against UVA and UVB rays are pivotal in minimizing sun-induced ocular damage.