December weather forecast
Jaçanã, Brazil

December, the first month of the summer in Jaçanã, is still a hot month, with an average temperature fluctuating between 32.2°C (90°F) and 21.8°C (71.2°F).

Temperature

With the transition into December, Jaçanã notes an average high-temperature of a still tropical 32.2°C (90°F), closely resembling November. December brings with it a nighttime average temperature of 21.8°C (71.2°F) in Jaçanã.

Heat index

For December, the heat index is evaluated at a sweltering 39°C (102.2°F). Ensure extra safety measures, heat exhaustion and heat cramps are likely. Continuous activity might result in heatstroke.
Always consider that heat index estimations are for light winds and places in the shade. Heat index values may rise by up to 15 Fahrenheit (8 Celsius) degrees when exposed to direct sunlight.
Note: The heat index, also known as 'real feel' or 'felt air temperature', evaluates the perceived heat by adding the effect of moisture in the air. 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. Under direct sun rays, the felt temperature might be heightened, with the heat index increasing by 15 Fahrenheit (8 Celsius) degrees. Heat index values are of high significance for children. Kids generally face higher risks than adults as they sweat less. Along with their large skin surface compared to their small bodies and higher heat production due to their activities, their vulnerability is increased.
When faced with excessive heat, the human body begins to perspire, utilizing the cooling benefits of sweat evaporation. Under high air temperature and humidity (high heat index) conditions, perspiration is limited, and the perception of heat is increased. Rising body temperatures resulting from an imbalance in heat absorption can lead to potential thermal issues.

Humidity

The average relative humidity in December is 63%.

Rainfall

In December, the rain falls for 8 days. Throughout December, 14mm (0.55") of precipitation is accumulated. Throughout the year, in Jaçanã, there are 139.1 rainfall days, and 485mm (19.09") of precipitation is accumulated.

Daylight

With an average of 12h and 30min of daylight, December has the longest days of the year.
On the first day of December in Jaçanã, sunrise is at 05:00 and sunset at 17:28. On the last day of the month, sunrise is at 05:13 and sunset at 17:42 -03.

Sunshine

In Jaçanã, the average sunshine in December is 8.8h.

UV index

The months with the highest UV index in Jaçanã are January through March, September through December, with an average maximum UV index of 7. A UV Index of 6 to 7 symbolizes a high threat to health from exposure to the Sun's UV rays for the ordinary person.
Note: An average UV index of 7 in December transforms into this advice:
Persist with safeguards and heed sun safety doctrines. Keeping sunburn at bay is of prime importance. Avoid direct sunlight between the hours of 10 a.m. and 4 p.m., when UV radiation is at its peak. Keep in mind that shade structures may not provide complete protection. For effective sun eye protection, rely on sunglasses certified for UVA and UVB resistance.