December weather forecast
Melgaço, Brazil

December, the first month of the summer in Melgaço, is still a hot month, with temperature in the range of an average low of 22.9°C (73.2°F) and an average high of 32.8°C (91°F).

Temperature

With the onset of December, the average high-temperature stands at a still tropical 32.8°C (91°F), closely aligned with November's 34.7°C (94.5°F). Melgaço records an average nighttime low-temperature of 22.9°C (73.2°F) throughout December.

Heat index

December's mean heat index is estimated at a blazing hot 47°C (116.6°F). Take note: Heat exhaustion and heat cramps are expected. Heatstroke can occur with prolonged effort.
Heat index readings emphasize conditions of light breezes and shaded spots. Heat index values have the potential to be boosted by 15 Fahrenheit (8 Celsius) degrees due to direct sunlight.
Note: The heat index, also known as 'felt air temperature' or 'apparent temperature', gives a temperature feeling by integrating air temperature and humidity. The influence of weather is personal, differing among individuals based on variations in body mass, stature, and the degree of physical exertion. With direct sunlight, be aware that it might enhance the heat sensation, raising the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly important for children. Children typically face more danger than adults as their sweat production is usually lower. Additionally, the bigger skin surface compared to their small size and the increased heat due to their activeness exacerbate the risk.
The body's self-cooling mechanism is rooted in perspiration, where evaporating sweat cools down excessive warmth. A surge in relative humidity can disrupt the body's normal cooling function by slowing evaporation, hence reducing the rate at which the body cools and intensifying the perception of heat. When the body is unable to balance heat gain, its temperature elevates, which may induce thermal illnesses.

Humidity

In Melgaço, Brazil, the average relative humidity in December is 79%.

Rainfall

In Melgaço, in December, during 25.5 rainfall days, 140mm (5.51") of precipitation is typically accumulated. Throughout the year, there are 282.9 rainfall days, and 1449mm (57.05") of precipitation is accumulated.

Daylight

The month with the longest days in Melgaço is December, with an average of 12h and 12min of daylight.
On the first day of December in Melgaço, sunrise is at 06:05 and sunset at 18:18. On the last day of the month, sunrise is at 06:19 and sunset at 18:32 -03.

Sunshine

In December, the average sunshine is 6.9h.

UV index

January through April 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 health vulnerability from exposure to the Sun's UV rays for the ordinary person.
Note: In December, the average maximum UV index of 6 translates into the following recommendations:
Resist extreme sun exposure. Guarding against solar damage is essential. Stay in the shade and avoid direct Sun exposure from 10 a.m. to 4 p.m., a period when UV radiation is particularly strong, noting that parasols or canopies may not offer total sun protection. A wide-brimmed hat is a staple for defending the face, eyes, ears, and neck from the Sun.