December weather forecast
Guarantã, Brazil

December, the first month of the summer in Guarantã, is still a warm month, with an average temperature varying between 21.1°C (70°F) and 29.8°C (85.6°F).

Temperature

The advent of December observes an average high-temperature of a still moderately hot 29.8°C (85.6°F), nearly identical to November's 29.9°C (85.8°F). During the month of December, the temperature generally drops to a low average of 21.1°C (70°F).

Heat index

In December, the average heat index is estimated 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.
Heat index data is primarily for areas with shade and subjected to light winds. Direct sunshine exposure could raise heat index values by as much as 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel' or 'feels like', represents the fusion of temperature and moisture in the air to suggest how warm it feels. The effect is experienced differently by individuals, hinging on unique characteristics such as body mass, stature, and level of activity. Consider the fact that direct sun exposure can influence how hot one feels, potentially raising the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values hold great significance to children. Young children are generally more endangered than adults, as they usually less sweat. And also, due to larger skin surface relative to their small bodies and higher heat production as a result of their activity.
The human body keeps its cool primarily through perspiration, as this process enables sweat to evaporate, taking away the excess heat. Under conditions of high relative humidity, the rate of evaporation decreases. This results in the body retaining more heat than under conditions of dry air. Heat-related challenges, like dehydration, can be anticipated when body heat isn't managed effectively.

Humidity

In December, the average relative humidity is 79%.

Rainfall

In Guarantã, during December, the rain falls for 26.4 days and regularly aggregates up to 175mm (6.89") of precipitation. Throughout the year, there are 195.6 rainfall days, and 1139mm (44.84") of precipitation is accumulated.

Daylight

With an average of 13h and 24min of daylight, December has the longest days of the year.
On the first day of the month, sunrise is at 05:26 and sunset at 18:48. On the last day of December, sunrise is at 05:38 and sunset at 19:05 -03.

Sunshine

The average sunshine in December is 7.7h.

UV index

The months with the highest UV index are January through April, July through December, with an average maximum UV index of 6. A UV Index reading of 6 to 7 represents a high health hazard from unprotected exposure to Sun's UV rays for the ordinary person.
Note: In December, a daily UV index of 6 turns into the following recommendations:
Sustain precautions and conform to sun safety norms. Preventing sunburn is necessary. Stay in the shade and limit direct Sun exposure from 10 a.m. to 4 p.m., a time when UV radiation is particularly strong. Remember, however, that shade structures may not provide complete protection. It's wise to wear UVA and UVB-blocking sunglasses when the sun shines brightly.