December weather forecast
Rio Uaçá, Brazil

December, the first month of the winter in Rio Uaçá, is still a warm month, with an average temperature ranging between min 22.1°C (71.8°F) and max 29.9°C (85.8°F).

Temperature

The onset of December results in a small decrease in the average high-temperature, moderately receding from a tropical 33.1°C (91.6°F) in November to a moderately hot 29.9°C (85.8°F). Rio Uaçá's nighttime temperature in December drops to an average of 22.1°C (71.8°F).

Heat index

The heat index in December is calculated to be a sweltering 39°C (102.2°F). Undertake enhanced precautions, heat exhaustion and heat cramps are possible risks. Continuous activity could trigger heatstroke.
Metrics for the heat index primarily focus on shaded spots and light wind conditions. With exposure to direct sunlight, the heat index may be increased by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature' or 'apparent temperature', reflects the blend of air temperature and relative humidity to give a temperature impression. The individual's impression of temperature can be affected by numerous factors such as metabolic variations, physical exertion, and attire. Do note, being directly under sun rays can amplify the heat you feel, potentially raising the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are highly critical for babies and toddlers. Youngsters often neglect the necessity for rest and hydration. Thirst is a sign of advancing dehydration - thus the importance of maintaining hydration, specifically during long-lasting physical activities.
To prevent overheating and help regulate its internal temperature, the human body sweat and rely on the evaporation to cool down. Augmented relative humidity impedes typical body cooling mechanisms by lowering the evaporation rate, resulting in decreased body cooling and an amplified perception of heat. When heat surpasses the body's release mechanisms, dehydration and overheating risks become pronounced.

Humidity

The average relative humidity in December is 86%.

Rainfall

In Rio Uaçá, Brazil, in December, it is raining for 25.3 days, with typically 154mm (6.06") of accumulated precipitation. Throughout the year, there are 280.4 rainfall days, and 1281mm (50.43") of precipitation is accumulated.

Daylight

December has the shortest days of the year, with an average of 11h and 54min of daylight.
On the first day of the month, sunrise is at 06:17 and sunset at 18:12. On the last day of December, sunrise is at 06:31 and sunset at 18:26 -03.

Sunshine

The average sunshine in December is 6h.

UV index

January through June and December, with an average maximum UV index of 6, are months with the lowest UV index. A UV Index reading of 6 to 7 represents a high threat to health from exposure to the Sun's UV radiation for ordinary individuals.
Note: The daily high UV index of 6 during December translates into the following recommendations:
Dodge overexposure. Fair-skinned people can get singed in less than 20 minutes. Between 10 a.m. and 4 p.m., the Sun's UV radiation is at its peak. Limit your exposure to direct sunlight during these hours. Sunglasses providing both UVA and UVB protection are non-negotiable on sunlit days.