December weather forecast
Guaiúba, Brazil

The first month of the summer, December, is still a tropical month in Guaiúba, Brazil, with an average temperature fluctuating between 31.9°C (89.4°F) and 24.6°C (76.3°F).

Temperature

The arrival of December brings an average high-temperature of a still hot 31.9°C (89.4°F), nearly identical to November's 32.2°C (90°F). Throughout the month of December, the nighttime temperature in Guaiúba dips to an average of 24.6°C (76.3°F).

Heat index

In December, the average heat index is evaluated at a blisteringly hot 40°C (104°F). Undertake enhanced precautions, heat exhaustion and heat cramps are possible risks. Continuous activity could trigger heatstroke.
Note that heat index values are valued for light wind and location in the shade. The heat index values could be amplified by up to 15 Fahrenheit (8 Celsius) degrees in direct sunlight.
Note: The heat index, also known as 'apparent temperature' or 'felt air temperature', is a calculation that merges air temperature and relative humidity to depict the sensation of warmth. This impact is subjective, influenced by the person's physical activity and individual heat perception, affected by factors including wind, attire, and metabolic differences. 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 are extremely significant for children. Young ones are generally at greater risk than adults due to their limited sweating ability. In addition, their large skin surface relative to their small bodies and higher heat production from their activities add to their vulnerability.
Perspiration is essential for the human body; it facilitates cooling through the process of sweat evaporation. Under conditions of high temperature and humidity (enhanced heat index), sweat production is compromised, exacerbating the sensation of warmth. Elevated heat gain compared to the body's release capability poses risks of dehydration and potential overheating.

Humidity

The average relative humidity in December is 71%.

Rainfall

In Guaiúba, in December, during 13.2 rainfall days, 19mm (0.75") of precipitation is typically accumulated. In Guaiúba, during the entire year, the rain falls for 183.1 days and collects up to 511mm (20.12") of precipitation.

Daylight

With an average of 12h and 24min of daylight, December has the longest days of the year in Guaiúba.
On the first day of December in Guaiúba, sunrise is at 05:13 and sunset at 17:33. On the last day of the month, sunrise is at 05:27 and sunset at 17:48 -03.

Sunshine

The average sunshine in December in Guaiúba is 7.3h.

UV index

January through March, May through December, with an average maximum UV index of 7, are months with the highest UV index. A UV Index reading of 6 to 7 represents a high health hazard from unprotected exposure to Sun's UV rays for average individuals.
Note: In December, a regular UV index of 7 translates into these guidelines:
Implement precautions and maintain sun safety methods. Avoidance of sunburn is demanded. Minimize exposure to direct sunlight and seek shade from 10 a.m. to 4 p.m., when UV radiation is most intense, but remember that shade structures may not offer complete protection. A wide-brim hat offers excellent sun protection for the eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure.