December weather forecastChã Preta, Brazil

Weather in December

The first month of the summer, December, is a hot month in Chã Preta, Brazil, with an average temperature ranging between min 20.5°C (68.9°F) and max 30.5°C (86.9°F).

Temperature

The transition into December notes an average high-temperature of a tropical 30.5°C (86.9°F), revealing a mild distinction from the 29.9°C (85.8°F) in November. Chã Preta experiences a consistent average temperature of 20.5°C (68.9°F) throughout the nights in December.

Heat index

The average heat index in December is appraised at a sweltering 38°C (100.4°F). Adopt special protective actions against heat exhaustion and heat cramps. Long-duration activity risks heatstroke.
Heat index guidelines indicate values are for light wind scenarios and shaded regions. A rise in the heat index by 15 Fahrenheit (8 Celsius) degrees may result from direct sunlight exposure.
Note: The heat index, also known as 'feels like' or 'real feel', melds the effects of warmth and moisture to generate a feeling of heat. An individual's perception of weather can be affected by a variety of elements including metabolic differences, being pregnant, and their level of physical exertion. Exposure to direct sun rays can influence the heat you feel, pushing the heat index up by 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly relevant to children. Children often miss understanding the importance of rest and rehydration. Thirst usually appears late during dehydration - therefore, maintaining hydration, particularly during long physical activities, is essential.
The primary way humans combat excessive warmth is by perspiring, letting sweat evaporate and cool the body. When the level of relative humidity is elevated, evaporation diminishes, causing more warmth to be retained in the body than in dry air. When heat uptake goes beyond the body's cooling mechanisms, there's a surge in body temperature, posing health risks.

Humidity

December is the least humid month, with an average relative humidity of 76%.

Rainfall

In Chã Preta, during December, the rain falls for 13.2 days and regularly aggregates up to 18mm (0.71") of precipitation. In Chã Preta, during the entire year, the rain falls for 227.4 days and collects up to 480mm (18.9") of precipitation.

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 04:55 and sunset at 17:33. On the last day of December, sunrise is at 05:08 and sunset at 17:48 -03.

Sunshine

In Chã Preta, the average sunshine in December is 7.2h.

UV index

The months with the highest UV index in Chã Preta are January through May, September through December, with an average maximum UV index of 6. A UV Index value of 6 to 7 symbolizes a high threat to health from unprotected exposure to Sun's UV rays for the average person.
Note: In December, the maximum UV index of 6 translates into these guidelines:
Take precautions against overexposure. Fair-skinned people may get burned in less than 20 minutes. Avoid direct Sun exposure from 10 a.m. to 4 p.m., a period when UV radiation is most intense, and remember that not all shade structures provide full protection. Tightly woven clothing, when worn loosely, shields effectively against the Sun.