December weather forecastRio Sono, Brazil

Weather in December

The first month of the summer, December, is also a hot month in Rio Sono, Brazil, with an average temperature varying between 31.3°C (88.3°F) and 22.2°C (72°F).

Temperature

The shift into December finds Rio Sono, Brazil, at an average high-temperature of a still tropical 31.3°C (88.3°F), closely comparable to November's conditions. Rio Sono, during the nights of December, experiences an average temperature drop to an agreeable 22.2°C (72°F).

Heat index

During December, the heat index is evaluated at a blistering 41°C (105.8°F). Implement more safety precautions, heat cramps and heat exhaustion may happen. Persistent activity could induce heatstroke.
It is crucial to understand that heat index figures are for shade and gentle wind conditions. 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 'felt air temperature' or 'apparent temperature', is a calculation that merges air temperature and relative humidity to depict the sensation of warmth. The impact of weather is individual, with diverse individuals experiencing it differently due to variations in body mass, height, and activity levels. Direct sun exposure is noteworthy in its ability to escalate the felt temperature, potentially adding 15 Fahrenheit (8 Celsius) degrees to the heat index. Heat index values are extremely vital to babies and toddlers. Children often fail to recognize the requirement to rest and rehydrate. Thirst, being a late symptom of dehydration, underlines the importance of maintaining hydration, especially during ongoing physical activities.
The human body cools itself through perspiration, as excessive warmth is removed from the body through sweat evaporation. In circumstances of high air temperature and humidity (high heat index), the body's perspiration is restricted, heightening the feeling of warmth. 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 in Rio Sono, Brazil, is 78%.

Rainfall

In Rio Sono, during December, the rain falls for 25.8 days and regularly aggregates up to 129mm (5.08") of precipitation. Throughout the year, there are 198 rainfall days, and 907mm (35.71") of precipitation is accumulated.

Daylight

December has the longest days of the year, with an average of 12h and 42min of daylight.
On the first day of the month, sunrise is at 05:41 and sunset at 18:19. On the last day of December, sunrise is at 05:55 and sunset at 18:34 -03.

Sunshine

In Rio Sono, the average sunshine in December is 9.3h.

UV index

The months with the lowest UV index in Rio Sono are February through May and December, with an average maximum UV index of 6. A UV Index of 6 to 7 symbolizes a high health vulnerability from exposure to the Sun's UV rays for the ordinary person.
Note: In December, the maximum UV index of 6 suggests this advice:
Persist in precautions and follow sun safety policies. Keeping sunburn at bay is imperative. The Sun's UV radiation is most potent between the hours of 10 a.m. and 4 p.m. Try to avoid direct sunlight during this time. Employ a hat with a wide brim for robust protection, cutting UV exposure by half.