December weather forecast
São Sebastião da Boa Vista, Brazil

The first month of the summer, December, is still a hot month in São Sebastião da Boa Vista, Brazil, with an average temperature ranging between max 32.7°C (90.9°F) and min 23.5°C (74.3°F).

Temperature

The arrival of December brings an average high-temperature of a still tropical 32.7°C (90.9°F), subtly diverging from November's 34.5°C (94.1°F). An average low-temperature of 23.5°C (74.3°F) is observed in São Sebastião da Boa Vista during the December nights.

Heat index

For December, the heat index is estimated at a life-threatening hot 46°C (114.8°F). Remain alert: Heat exhaustion and heat cramps are predicted. Extended effort can lead to heatstroke.
In the scope of the heat index, its values resonate with shade and light wind conditions. The heat index can potentially augment by 15 Fahrenheit (8 Celsius) degrees due to direct sunlight.
Note: The heat index, also known as 'felt air temperature' or 'real feel', joins air temperature with relative humidity to produce a temperature perception for humans. An individual's perception of weather can be swayed by a variety of elements including metabolic differences, pregnancy status, and their level of physical exertion. 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 of high significance for children. Youngsters frequently overlook the need for breaks and fluid intake. Thirst is an advanced sign of dehydration - thereby highlighting the importance of keeping hydrated, particularly during long physical activities.
Evaporating sweat, an outcome of perspiration, is key in assisting the human body to moderate its temperature. Greater relative humidity lessens the rate of evaporation, thus decreasing the body's heat dispersal, which gives rise to a sensation of overheating. When body temperature rises due to excess heat gain beyond its removal capability, one might experience heat-related disorders.

Humidity

In São Sebastião da Boa Vista, the average relative humidity in December is 77%.

Rainfall

In São Sebastião da Boa Vista, during December, the rain falls for 24.9 days and regularly aggregates up to 157mm (6.18") of precipitation. In São Sebastião da Boa Vista, Brazil, during the entire year, the rain falls for 285.2 days and collects up to 1825mm (71.85") of precipitation.

Daylight

With an average of 12h and 12min of daylight, December has the longest days of the year in São Sebastião da Boa Vista.
On the first day of the month, sunrise is at 06:00 and sunset at 18:13. On the last day of December, sunrise is at 06:14 and sunset at 18:28 -03.

Sunshine

The average sunshine in December is 7.5h.

UV index

The months with the lowest UV index are January through April and December, with an average maximum UV index of 6. A UV Index value of 6 to 7 symbolizes a high health hazard from exposure to the Sun's UV rays for the ordinary person.
Note: A maximum UV index of 6 in December translates into the following recommendations:
Shun overexposure. Protection from sun ravages is indispensable. Avoid direct exposure to the Sun between 10 a.m. and 4 p.m., the peak period for UV radiation, noting that objects like parasols or canopies might not offer complete sun protection. Using UVA and UVB-protective sunglasses and sun-protective clothing is effective against UV radiation.