December weather forecast
Piracicaba, Brazil

The first month of the summer, December, is still a warm month in Piracicaba, Brazil, with an average temperature ranging between max 29°C (84.2°F) and min 19.6°C (67.3°F).

Temperature

The onset of December notes an average high-temperature of a still moderately hot 29°C (84.2°F), subtly shifted from November's 28.5°C (83.3°F). During the month of December, an average temperature of 19.6°C (67.3°F) is noted during the nights.

Heat index

December's mean heat index is estimated at a sweltering 35°C (95°F). Ensure additional precautions, heat exhaustion and heat cramps may be expected. Heatstroke could occur from sustained activity.
From a standpoint of the heat index, values pertain to shaded conditions and mild breezes. Heat index values can rise by 15 Fahrenheit (8 Celsius) degrees when in direct sunlight.
Note: The heat index, also known as 'feels like' or 'felt air temperature', gives an indication of how one might feel in terms of heat after considering humidity. This effect is personal, influenced by the individual's physical activity and heat sensitivity, shaped by factors including wind, attire, and metabolic variations. In direct sunlight, the heat's impact can be heightened, potentially leading to an increase in the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are of high significance for children. Young ones regularly neglect the requirement for rest and fluid replenishment. Thirst is a late stage of dehydration - so, it is necessary to keep hydrated, particularly during extended periods of physical exertion.
The human body cools itself through perspiration, as excessive warmth is removed from the body through sweat evaporation. An elevated level of relative humidity hinders evaporation, leading to decreased heat elimination from the body, inducing a sensation of excess heat. When heat surpasses the body's release mechanisms, dehydration and overheating risks become pronounced.

Humidity

In Piracicaba, Brazil, the average relative humidity in December is 79%.

Rainfall

In Piracicaba, in December, it is raining for 26.5 days, with typically 177mm (6.97") of accumulated precipitation. In Piracicaba, during the entire year, the rain falls for 208.3 days and collects up to 1276mm (50.24") of precipitation.

Daylight

With an average of 13h and 30min of daylight, December has the longest days of the year in Piracicaba.
On the first day of December in Piracicaba, Brazil, sunrise is at 05:16 and sunset at 18:42. On the last day of the month, sunrise is at 05:28 and sunset at 18:58 -03.

Sunshine

The average sunshine in December in Piracicaba is 7.9h.

UV index

The months with the lowest UV index are February through July, September and December, with an average maximum UV index of 5. A UV Index of 3 to 5 symbolizes a moderate threat to health from unprotected exposure to Sun's UV rays for the ordinary person.
Note: A daily maximum UV index of 5 in December translates into the following instructions:
Take necessary precautions - Protection from skin and eye injury is mandatory. Stay safe from the Sun's strongest UV rays by limiting exposure during midday. For minimizing sun-related eye damage, always choose sunglasses with UVA and UVB coverage.