December weather forecast
Chaval, Brazil

The first month of the summer, December, is still a tropical month in Chaval, Brazil, with an average temperature ranging between max 33.3°C (91.9°F) and min 24.5°C (76.1°F).

Temperature

December's presence records an average high-temperature of a still hot 33.3°C (91.9°F), closely mirroring November's climate. During the month of December, an average temperature of 24.5°C (76.1°F) is noted during the nights.

Heat index

The heat index value during December is estimated at a blisteringly hot 44°C (111.2°F). Beware: Heat cramps and heat exhaustion are very likely. Heatstroke is imminent with prolonged activity.
Always consider that heat index estimations are for light winds and places in the shade. Heat index values may rise by up to 15 Fahrenheit (8 Celsius) degrees when exposed to direct sunlight.
Note: The heat index, also known as 'feels like' or 'felt air temperature', blends air temperature and moisture content to represent the felt temperature to humans. This effect is personal, influenced by the individual's physical activity and heat sensitivity, shaped by factors including wind, attire, and metabolic variations. Take note that direct exposure to the sun can increase the felt temperature, possibly adding 15 Fahrenheit (8 Celsius) degrees to the heat index. Heat index values are primarily vital for children. Younglings are generally more in peril than adults due to their reduced perspiration. Coupled with a larger skin surface relative to their tiny bodies and greater heat production because of their activity, they become more at risk.
The human body cools itself through perspiration, as excessive warmth is removed from the body through sweat evaporation. An increase in relative humidity hinders the body's normal cooling function by reducing evaporation, thereby decreasing the rate of body cooling and enhancing the sense of warmth. Overheating and dehydration threats arise when heat gain goes beyond what the body can comfortably shed.

Humidity

The average relative humidity in December is 68%.

Rainfall

In Chaval, in December, it is raining for 9 days, with typically 29mm (1.14") of accumulated precipitation. Throughout the year, there are 141.3 rainfall days, and 549mm (21.61") of precipitation is accumulated.

Daylight

December has the longest days of the year, with an average of 12h and 18min of daylight.
On the first day of the month, sunrise is at 05:25 and sunset at 17:42. On the last day of December, sunrise is at 05:39 and sunset at 17:57 -03.

Sunshine

In December, the average sunshine in Chaval is 7.6h.

UV index

The months with the highest UV index are February through December, with an average maximum UV index of 7. A UV Index value of 6 to 7 symbolizes a high health vulnerability from unprotected exposure to Sun's UV rays for the average person.
Note: The maximum UV index of 7 during December leads to these instructions:
Resist extreme sun exposure. Guarding against solar damage is essential. The Sun's UV radiation is most potent between the hours of 10 a.m. and 4 p.m. Try to avoid direct sunlight during this time. Sun-related eye harm can be minimized with proper sunglasses offering UVA and UVB coverage.