December weather forecast
Altaneira, Brazil

December, the first month of the summer in Altaneira, is still a tropical month, with an average temperature ranging between min 20.9°C (69.6°F) and max 31.4°C (88.5°F).

Temperature

The commencement of December brings an average high-temperature of a still hot 31.4°C (88.5°F), marking an inconsequential divergence from November. In Altaneira, an average temperature of 20.9°C (69.6°F) is noted during December nights.

Heat index

December's average heat index is evaluated at a fiery hot 36°C (96.8°F). More preventive actions are needed, risk of heat exhaustion and heat cramps is significant. Prolonged activity may trigger heatstroke.
The standards for the heat index are set for locations in shade and under light breezes. The direct sunshine could escalate the heat index values by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like' or 'apparent temperature', determines the feeling of heat when you account for the relative humidity. This effect is subjective, differing among individuals based on their physical activity and perception of heat, which can be influenced by factors like wind, clothing, and metabolic variances. The sun, when shining directly, can have a significant impact on the perceived temperature, increasing the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are primarily vital for children. Children frequently do not comprehend the need for rest and hydration. Thirst is an advanced stage of dehydration - staying hydrated, especially during extended physical exercises, is essential.
The physiological response of the human body to excess warmth is to perspire, thereby cooling itself through sweat evaporation. A higher relative humidity affects normal body cooling by reducing the evaporation rate, subsequently lowering the rate at which the body cools and increasing the perception of heat. When heat gain surpasses the level the body can shed, body temperature begins to increase, and consequently, overheating and dehydration can occur, with varying severity.

Humidity

The average relative humidity in December is 60%.

Rainfall

In Altaneira, in December, it is raining for 17 days, with typically 78mm (3.07") of accumulated precipitation. Throughout the year, there are 172.3 rainfall days, and 764mm (30.08") of precipitation is accumulated.

Daylight

The month with the longest days is December, with an average of 12h and 30min of daylight.
On the first day of the month, sunrise is at 05:13 and sunset at 17:43. On the last day of December, sunrise is at 05:26 and sunset at 17:57 -03.

Sunshine

In Altaneira, the average sunshine in December is 8.1h.

UV index

January through August and December, with an average maximum UV index of 6, are months with the lowest UV index in Altaneira, Brazil. A UV Index reading of 6 to 7 represents a high threat to health from exposure to the Sun's UV radiation for the ordinary person.
Note: The maximum daily UV index, 6 in December, converts into the following recommendations:
Exercise precautions and adapt sun safety practices. Defence against skin and eye affliction is paramount. Between 10 a.m. and 4 p.m., the Sun's UV radiation is at its peak. Limit your exposure to direct sunlight during these hours. Your best bet for sun defense on the face, eyes, and neck is a hat with a wide brim.