December weather forecast
Teresina, Brazil

Closing out the year, December in Teresina carries forward the re-established wet climate from November. The month witnesses an upward surge in rainfall, while the temperature begins to dip slightly compared to the previous months. December stands out with a higher rainfall volume of 115mm (4.53"), cementing the total return to the city’s wet season. Though more cloudy, the month still offers ample sunshine and warm temperatures. As such, Teresina in December presents a blend of increased rainfall, moderate temperatures, and abundant sunshine.

Temperature

The transition into December in Teresina shows a subtle variation to a hot 33.5°C (92.3°F) from November's 35.2°C (95.4°F) in the average high-temperature. During the month of December, Teresina's nighttime temperature lowers to an average of 23.6°C (74.5°F).

Heat index

The heat index value during December is calculated to be an extremely hot 44°C (111.2°F). Heed: Expect heat cramps and heat exhaustion. Continued action may cause heatstroke.
It is essential to grasp that the heat index's numbers are for shade and light wind settings. With exposure to direct sunlight, the heat index may be increased by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature' or 'felt air temperature', is a metric representing the sensation of warmth when air temperature and moisture come together. One's perception of temperature can vary depending on physical activity and individual heat sensitivity, influenced by factors like wind, attire, and metabolic variations. Be mindful that being in direct sunlight might mean feeling hotter, with the heat index rising by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values hold particular importance for children. Typically, young kids are at a higher risk than adults since they sweat less. Also, the larger skin surface in proportion to their small bodies and the heightened heat production due to their active nature adds to their vulnerability.
To prevent overheating and help regulate its internal temperature, the human body sweat and rely on the evaporation to cool down. Under conditions of increased relative humidity, the evaporation rate lessens, causing the body to retain more heat than under less humid conditions. When heat surpasses the body's release mechanisms, dehydration and overheating risks become pronounced.

Humidity

The average relative humidity in December is 67%.

Rainfall

In Teresina, in December, during 21.7 rainfall days, 115mm (4.53") of precipitation is typically accumulated. Throughout the year, in Teresina, Brazil, there are 207.4 rainfall days, and 1348mm (53.07") of precipitation is accumulated.

Daylight

The month with the longest days in Teresina is December, with an average of 12h and 24min of daylight.
On the first day of December in Teresina, sunrise is at 05:28 and sunset at 17:52. On the last day of the month, sunrise is at 05:42 and sunset at 18:06 -03.

Sunshine

In Teresina, the average sunshine in December is 8.7h.

UV index

The months with the highest UV index are January, March through December, with an average maximum UV index of 7. A UV Index reading of 6 to 7 represents a high health risk from exposure to the Sun's UV rays for ordinary individuals.
Note: In December, the average maximum UV index of 7 translates into the following recommendations:
Guard against overexposure. Protection from sun-induced harm is essential. 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.