December weather forecast
Açu, Brazil

December, the first month of the summer in Açu, is still a very hot month, with an average temperature fluctuating between 35°C (95°F) and 24.2°C (75.6°F).

Temperature

As Açu welcomes December, the average high-temperature stabilizes at a still torrid 35°C (95°F), showing little deviation from November's 35.5°C (95.9°F). Açu's nights in December experience an average temperature drop to a moderately hot 24.2°C (75.6°F).

Heat index

The heat index in December is appraised at a blisteringly hot 44°C (111.2°F). Be prepared: Heat cramps and heat exhaustion are probable. Continued activity may lead to heatstroke.
Heat index values are typically calculated for conditions of shade and a light breeze. Heat index values may surge by up to 15 Fahrenheit (8 Celsius) degrees in the presence of direct sunlight.
Note: The heat index, also known as 'feels like' or 'felt air temperature', unifies temperature and humidity readings to offer a comprehensive feel of warmth. One's perception of temperature can vary depending on physical activity and individual heat sensitivity, influenced by factors like wind, attire, and metabolic variations. Consider that direct sun exposure can intensify the felt heat, adding potentially 15 Fahrenheit (8 Celsius) degrees to the heat index. Heat index values hold particular importance for children. Children often lack awareness of the importance of taking breaks and rehydrating. The feeling of thirst is a late indication of dehydration, so maintaining hydration, especially during long periods of physical activity, is critical.
The human body keeps its cool primarily through perspiration, as this process enables sweat to evaporate, taking away the excess heat. An elevated level of relative humidity hinders evaporation, leading to decreased heat elimination from the body, inducing a sensation of excess heat. When the body is unable to balance heat gain, its temperature elevates, which may induce thermal illnesses.

Humidity

In Açu, Brazil, the average relative humidity in December is 57%.

Rainfall

In Açu, during December, the rain falls for 4.3 days and regularly aggregates up to 10mm (0.39") of precipitation. In Açu, during the entire year, the rain falls for 112.4 days and collects up to 381mm (15") of precipitation.

Daylight

December has the longest days of the year in Açu, Brazil, with an average of 12h and 24min of daylight.
On the first day of December in Açu, sunrise is at 05:04 and sunset at 17:29. On the last day of the month, sunrise is at 05:17 and sunset at 17:44 -03.

Sunshine

In Açu, the average sunshine in December is 8.9h.

UV index

January through December, with an average maximum UV index of 7, are months with the highest UV index. January through December, with an average maximum UV index of 7, are months with the lowest UV index in Açu. A UV Index of 6 to 7 symbolizes a high health risk from unprotected exposure to Sun's UV rays for the ordinary person.
Note: The average daily UV index of 7 in December transforms into the following instructions:
Beware of overexposure. Fair-skinned individuals risk burning in less than 20 minutes. Limit direct sun exposure especially between 10 a.m. and 4 p.m., when UV radiation is at its peak. However, keep in mind that shade structures may not provide full sun protection. By wearing a generously brimmed hat, you can cut UV radiation exposure significantly.