December weather forecast
Serra Preta, Brazil

December, the first month of the summer in Serra Preta, is still a tropical month, with an average temperature varying between 21.2°C (70.2°F) and 32.4°C (90.3°F).

Temperature

The commencement of December records an average high-temperature of a still hot 32.4°C (90.3°F), barely varying from November's 31.5°C (88.7°F). Serra Preta observes an average nighttime temperature of 21.2°C (70.2°F) during December.

Heat index

Throughout December, the heat index is calculated to be a blisteringly hot 43°C (109.4°F). Keep on guard: Heat exhaustion and heat cramps are probable. Heatstroke is a possible danger with ongoing physical activity.
Given the heat index, its values are aligned with shaded sites and gentle winds. When exposed to the direct sun, the heat index may augment by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature' or 'feels like', offers an insight into how hot it feels when we factor in moisture content. The influence of weather is personal, differing among a variety of individuals based on differences in body mass, stature, and the level of physical activity. Direct sun rays have a notable impact on perceived temperature, which can raise the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are highly important for children. Youngsters generally face more threats than adults given their lesser ability to sweat. Coupled with their larger skin surface relative to their small bodies and higher heat production due to their activities, they are more endangered.
To prevent overheating and help regulate its internal temperature, the human body sweat and rely on the evaporation to cool down. When there is an excess of moisture in the atmosphere, the efficiency of the evaporation process is lessened, leading to less efficient body cooling and a sensation of overheating. If heat absorption isn't effectively countered by the body's cooling methods, body temperature surges, hinting at potential problems.

Humidity

The average relative humidity in December is 73%.

Rainfall

In Serra Preta, during December, the rain falls for 16.1 days and regularly aggregates up to 43mm (1.69") of precipitation. Throughout the year, there are 222.1 rainfall days, and 403mm (15.87") of precipitation is accumulated.

Daylight

With an average of 12h and 48min of daylight, December has the longest days of the year in Serra Preta.
On the first day of December in Serra Preta, Brazil, sunrise is at 05:02 and sunset at 17:50. On the last day of the month, sunrise is at 05:15 and sunset at 18:05 -03.

Sunshine

In Serra Preta, the average sunshine in December is 7.7h.

UV index

The months with the highest UV index are January through March and 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 radiation for average individuals.
Note: An average maximum UV index of 7 in December leads to these recommendations:
Steer clear of overexposure. Fair-skinned individuals can be scorched in less than 20 minutes. Stay in the shade and avoid direct Sun exposure from 10 a.m. to 4 p.m., a time when UV radiation is at its strongest, and remember that parasols or canopies do not offer full protection. Always opt for UVA and UVB-resistant sunglasses on radiant days.