December weather forecast
Santa Fé do Sul, Brazil

December, the first month of the summer in Santa Fé do Sul, is still a hot month, with an average temperature ranging between max 30.2°C (86.4°F) and min 21.7°C (71.1°F).

Temperature

December denotes a minimal variation in the average high-temperature to a still tropical 30.2°C (86.4°F) from November's 30.7°C (87.3°F). Throughout December, Santa Fé do Sul witnesses a consistent average low-temperature of 21.7°C (71.1°F).

Heat index

During December, the heat index is calculated to be a very hot 38°C (100.4°F). Ensure additional precautions, heat exhaustion and heat cramps may be expected. Heatstroke could occur from sustained activity.
Heat index guidelines indicate values are for light wind scenarios and shaded regions. Exposure to the sun directly might heighten the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature' or 'felt air temperature', comes about by integrating the temperature readings with the humidity levels. One's perception of temperature is subjective, varying based on their activity and individual heat perception, influenced by factors like wind, clothing, and metabolic variations. Awareness is key; direct sunlight can enhance the weather's impact, possibly boosting the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are extremely significant for children. Children often overlook the need for breaks and fluid intake. Thirst is a late-stage sign of dehydration - hence, it is necessary to stay hydrated, especially during extended periods of physical activities.
The physiological response of the human body to excess warmth is to perspire, thereby cooling itself through sweat evaporation. When the relative humidity is high, the evaporation rate is reduced. The warmth is removed from the body at a lower rate, causing the body to retain more heat than it would in dry air. Increasing body temperatures can be a precursor to dehydration if the body can't shed the extra heat.

Humidity

The average relative humidity in December in Santa Fé do Sul is 79%.

Rainfall

In Santa Fé do Sul, in December, during 28.5 rainfall days, 201mm (7.91") of precipitation is typically accumulated. In Santa Fé do Sul, during the entire year, the rain falls for 209.8 days and collects up to 1277mm (50.28") of precipitation.

Daylight

December has the longest days of the year in Santa Fé do Sul, with an average of 13h and 18min of daylight.
On the first day of the month, sunrise is at 05:34 and sunset at 18:51. On the last day of December, in Santa Fé do Sul, sunrise is at 05:46 and sunset at 19:07 -03.

Sunshine

In Santa Fé do Sul, the average sunshine in December is 7.7h.

UV index

January through July, November and December, with an average maximum UV index of 6, are months with the lowest UV index. A UV Index value of 6 to 7 symbolizes a high health vulnerability from unprotected exposure to Sun's UV rays for average individuals.
Note: A typical high UV index of 6 in December suggests the following recommendations:
Take precautions against overexposure. Fair-skinned people may get burned in less than 20 minutes. 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. Outfit yourself in sun-safe attire, like long sleeves, pants, a hat, and UV-blocking sunglasses.