December weather forecast
Nazaré da Mata, Brazil

The first month of the summer, December, is still a tropical month in Nazaré da Mata, Brazil, with an average temperature fluctuating between 22.9°C (73.2°F) and 30.5°C (86.9°F).

Temperature

December notes an average high-temperature of a still hot 30.5°C (86.9°F), subtly differing from November's 30.1°C (86.2°F). During December, Nazaré da Mata observes a consistent average nighttime temperature of 22.9°C (73.2°F).

Heat index

For December, the heat index is evaluated at a sweltering 37°C (98.6°F). Greater preventive actions are needed, heat exhaustion and heat cramps are likely. Persistent activity could provoke heatstroke.
Data suggests that the heat index is set for environments in shade and with a light wind. Exposure to the direct sun might augment heat index values by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like' or 'felt air temperature', is a composite of temperature and humidity figures to convey how warm it feels. A person's impression of weather can be swayed by numerous aspects, among them metabolic variations, pregnancy, and activity levels. Remember, direct sunlight exposure can heighten the heat impact and might increase the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values hold particular importance for children. Kids frequently ignore the importance of taking a break and rehydrating. Thirst is a late symptom of dehydration - thus, it is crucial to stay hydrated, especially during long-lasting physical activities.
The innate cooling system of the human body revolves around perspiration, with the evaporation of sweat being central to this process. In the presence of elevated relative humidity, the evaporation rate decreases. This reduction leads to increased body heat retention compared to conditions of dry air. When body temperature rises due to excess heat gain beyond its removal capability, one might experience heat-related disorders.

Humidity

The months with the lowest humidity are November and December, with an average relative humidity of 73%.

Rainfall

In Nazaré da Mata, during December, the rain falls for 20.6 days and regularly aggregates up to 24mm (0.94") of precipitation. In Nazaré da Mata, during the entire year, the rain falls for 263 days and collects up to 463mm (18.23") of precipitation.

Daylight

December has the longest days of the year in Nazaré da Mata, with an average of 12h and 36min of daylight.
On the first day of the month, sunrise is at 04:53 and sunset at 17:26. On the last day of December, in Nazaré da Mata, sunrise is at 05:07 and sunset at 17:41 -03.

Sunshine

The average sunshine in December is 7.4h.

UV index

January through March, November and December, with an average maximum UV index of 7, are months with the highest UV index. A UV Index estimate of 6 to 7 represents a high health vulnerability from unsafe exposure to UV radiation for the ordinary person.
Note: In December, a daily maximum UV index of 7 leads to the following instructions:
Ward off overexposure. Defence against solar harm is crucial. Seek shade and limit direct Sun exposure between 10 a.m. and 4 p.m., when UV radiation is at its peak, but be aware that not all shade structures provide complete sun protection. Experience reduced UV exposure by about half when donning a wide-brim hat.