December weather forecast
Mata Redonda, Brazil

The first month of the summer, December, is still a tropical month in Mata Redonda, Brazil, with an average temperature ranging between max 30.4°C (86.7°F) and min 23.6°C (74.5°F).

Temperature

December's onset records a minor alteration in the average high-temperature to a still hot 30.4°C (86.7°F) from November's 30.1°C (86.2°F). The average low-temperature of 23.6°C (74.5°F) is witnessed during December.

Heat index

For December, the heat index is appraised at a very hot 37°C (98.6°F). Exercise more precautions, heat cramps and heat exhaustion are potential risks. Continuous activity could precipitate heatstroke.
The metrics for the heat index are tailored for both shady environments and light winds. Exposing to direct sunshine may enhance heat index values by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature' or 'apparent temperature', is what the temperature feels like to the human body when the air temperature is combined with the relative humidity. Factors such as metabolic variations, being pregnant, and physical activity can impact an individual's weather perception. The sun, when shining directly, can have a significant impact on the perceived temperature, increasing the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are largely significant for babies and toddlers. Children frequently underestimate the necessity to rest and hydrate. Thirst is a late sign of dehydration - thus, it is vital to stay hydrated, particularly during lengthy physical exercises.
The human body cools itself through perspiration, as excessive warmth is removed from the body through sweat evaporation. A higher relative humidity affects normal body cooling by reducing the evaporation rate, subsequently lowering the rate at which the body cools and increasing the perception of heat. When heat surpasses the body's release mechanisms, dehydration and overheating risks become pronounced.

Humidity

November and December, with an average relative humidity of 72%, are the least humid months.

Rainfall

In December, the rain falls for 17.6 days. Throughout December, 22mm (0.87") of precipitation is accumulated. Throughout the year, there are 235.6 rainfall days, and 501mm (19.72") of precipitation is accumulated.

Daylight

The month with the longest days is December, with an average of 12h and 30min of daylight.
On the first day of the month, sunrise is at 04:53 and sunset at 17:24. On the last day of December, sunrise is at 05:06 and sunset at 17:39 -03.

Sunshine

In Mata Redonda, the average sunshine in December is 7.3h.

UV index

The months with the highest UV index are January through April, October through December, with an average maximum UV index of 7. A UV Index value of 6 to 7 symbolizes a high threat to health from exposure to the Sun's UV radiation for ordinary individuals.
Note: The UV index of 7 during December translates into the following guidance:
Act on precautions and pay attention to sun safety recommendations. Avoidance of sunburn is obligatory. The Sun's UV radiation is most intense from 10 a.m. to 4 p.m. Try to avoid direct sun exposure during these hours. To cut down UV radiation exposure by about half, sport a wide-brim hat.