December weather forecast
Altair, Brazil

December, the first month of the summer in Altair, is also a moderately hot month, with an average temperature fluctuating between 20.8°C (69.4°F) and 29.4°C (84.9°F).

Temperature

Upon the beginning of December, Altair's high-temperatures register at a still warm 29.4°C (84.9°F), closely mirroring the preceding month. Throughout December nights, Altair registers an average low-temperature of 20.8°C (69.4°F).

Heat index

The heat index value for December is computed to be a fiery hot 36°C (96.8°F). Take greater precautions, heat exhaustion and heat cramps may be expected. Heatstroke could result from lengthy activity.
Heat index guidelines indicate values are for light wind scenarios and shaded regions. With exposure to direct sunshine, the heat index could climb by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature' or 'apparent temperature', is the result of factoring in humidity to the air temperature, indicating perceived warmth. The perception of temperature can be subjective, varying based on activity and individual heat sensitivity, influenced by factors like wind, attire, and metabolic variations. Given direct exposure to sunlight, one might experience a rise in the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are especially vital to children. Youngsters typically face more danger than adults since they sweat less. Their larger skin surface compared to their small bodies and heightened heat production from their activities augment their vulnerability.
To prevent overheating and help regulate its internal temperature, the human body sweat and rely on the evaporation to cool down. With high air temperature and humidity (high heat index) conditions, sweat production is restricted, leading to an amplified perception of heat. Accumulating more heat than the body can dissipate leads to an uptick in body temperature, with potential heat stress consequences.

Humidity

The average relative humidity in December is 82%.

Rainfall

In December, the rain falls for 28.5 days. Throughout December, 194mm (7.64") of precipitation is accumulated. In Altair, during the entire year, the rain falls for 210.1 days and collects up to 1237mm (48.7") of precipitation.

Daylight

The month with the longest days is December, with an average of 13h and 24min of daylight.
On the first day of December, sunrise is at 05:26 and sunset at 18:44. On the last day of the month, sunrise is at 05:38 and sunset at 19:00 -03.

Sunshine

In Altair, the average sunshine in December is 7.7h.

UV index

The months with the highest UV index are January, March through December, with an average maximum UV index of 6. A UV Index estimate of 6 to 7 represents a high health vulnerability from exposure to the Sun's UV radiation for average individuals.
Note: A maximum high UV index of 6 in December translates into the following recommendations:
Adhere to precautions and respect sun safety doctrines. Avoiding sunburn is vital. Between 10 a.m. and 4 p.m., the Sun's UV radiation is at its peak. Limit your exposure to direct sunlight during these hours. A wide-brimmed hat is a staple for defending the face, eyes, ears, and neck from the Sun.