December weather forecast
Caiabu, Brazil

December, the first month of the summer in Caiabu, is still a tropical month, with an average temperature ranging between max 30°C (86°F) and min 21.3°C (70.3°F).

Temperature

Transitioning from November to December, Caiabu observes an average high-temperature of a still hot 30°C (86°F), differing subtly from the previous month. In the month of December, Caiabu records a consistent average low-temperature of 21.3°C (70.3°F).

Heat index

December's mean heat index is evaluated at a sweltering 37°C (98.6°F). Adopt heightened safety measures, heat cramps and heat exhaustion may occur. Sustained activity might cause heatstroke.
Heat index guidelines indicate values are for light wind scenarios and shaded regions. A rise of up to 15 Fahrenheit (8 Celsius) degrees in the heat index could result from direct sunlight.
Note: The heat index, also known as 'apparent temperature' or 'real feel', is an estimation of the warmth sensation when considering humidity levels. This effect tends to be personal, with the weather perception differing among individuals due to variations in body mass, height, and exertion. Recognize that direct exposure to the sun can escalate the heat effect, potentially adding 15 Fahrenheit (8 Celsius) degrees to the heat index. Heat index values are particularly relevant to 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.
Perspiration is essential for the human body; it facilitates cooling through the process of sweat evaporation. When relative humidity is on the rise, it curtails evaporation, thereby reducing the heat elimination from the body and causing the feeling of being excessively hot. With body temperatures on the rise, inefficient heat shedding can lead to dehydration and its associated complications.

Humidity

The average relative humidity in December is 78%.

Rainfall

In December, the rain falls for 25.8 days. Throughout December, 168mm (6.61") of precipitation is accumulated. Throughout the year, in Caiabu, there are 196.8 rainfall days, and 1260mm (49.61") of precipitation is accumulated.

Daylight

The month with the longest days in Caiabu is December, with an average of 13h and 30min of daylight.
On the first day of December in Caiabu, Brazil, sunrise is at 05:32 and sunset at 18:55. On the last day of the month, sunrise is at 05:44 and sunset at 19:11 -03.

Sunshine

The average sunshine in December in Caiabu is 7.8h.

UV index

January through March, June through December, with an average maximum UV index of 6, are months with the highest UV index. A UV Index value of 6 to 7 symbolizes a high health vulnerability from exposure to the Sun's UV radiation for the average person.
Note: A daily maximum UV index of 6 in December translates into the following instructions:
Guard against overexposure. Protection from sun-induced harm is essential. 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. Consider a wide-brim hat essential for effective sun defense covering your face, neck, and eyes.