December weather forecast
Alcântara, Brazil

The first month of the summer, December, is also a hot month in Alcântara, Brazil, with an average temperature fluctuating between 30.1°C (86.2°F) and 25.8°C (78.4°F).

Temperature

December observes an average high-temperature of a still hot 30.1°C (86.2°F), marking an insignificant difference from November's 30.5°C (86.9°F). Alcântara navigates through December with a barely noticeable decrease in temperature at night, stabilizing at a moderately hot 25.8°C (78.4°F).

Heat index

In December, the average heat index is estimated at a very hot 37°C (98.6°F). Adopt extra safety steps, risk of heat exhaustion and heat cramps is notable. Sustained activity might cause heatstroke.
When assessing, remember that heat index measurements are for light winds and shaded spots. Exposure to direct sunlight may make the heat index values climb by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like' or 'apparent temperature', is a single figure representing how weather conditions feel when combining temperature and humidity. An individual's perception of weather can be influenced by a variety of factors including metabolic differences, being pregnant, and their degree of physical exertion. Understand that direct sun rays can influence the weather's impact, leading to an increase in the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are of high significance for children. Youths are typically more endangered than adults since they usually sweat less. Their larger skin surface concerning their smaller bodies and higher heat production due to activity further adds to their vulnerability.
The human body normally cools itself by perspiration. Excessive warmth is eliminated from the body by evaporation of sweat. An increase in relative humidity disrupts body cooling by slowing the evaporation rate, thereby reducing the rate at which the body cools and amplifying the sense of heat. When the body's heat gain surpasses its removal capacity, body temperature starts to climb, leading to potential heat-related ailments.

Humidity

In December, the average relative humidity in Alcântara is 77%.

Rainfall

In Alcântara, in December, it is raining for 23.6 days, with typically 176mm (6.93") of accumulated precipitation. In Alcântara, during the entire year, the rain falls for 291.1 days and collects up to 2596mm (102.2") of precipitation.

Sea temperature

In Alcântara, in December, the average water temperature is 28.2°C (82.8°F).
Note: For any water activity, the surface water temperatures in the range of 25°C (77°F) to 29°C (84.2°F) are deemed excellent and incredibly pleasant for longer durations.

Daylight

The month with the longest days is December, with an average of 12h and 18min of daylight.
On the first day of December in Alcântara, sunrise is at 05:39 and sunset at 17:54. On the last day of the month, sunrise is at 05:53 and sunset at 18:08 -03.

Sunshine

In Alcântara, the average sunshine in December is 8h.

UV index

January through March, May and December, with an average maximum UV index of 6, are months with the lowest UV index. A UV Index value of 6 to 7 symbolizes a high health risk from unprotected exposure to Sun's UV rays for the ordinary person.
Note: In December, a daily UV index of 6 turns into the following recommendations:
Continue precautions and advocate sun safety advice. Deterrence of sunburn is indispensable. Seek shade and limit direct Sun exposure between 10 a.m. and 4 p.m., when UV radiation is at its peak, but be aware that not all shade structures provide complete sun protection. A hat with a generous brim can prevent nearly 50% of UV rays from reaching your eyes. Be cautious! Sand and water surfaces make the Sun's UV rays more potent.