December weather forecast
Altos, Brazil

The first month of the summer, December, is still a hot month in Altos, Brazil, with an average temperature fluctuating between 23.9°C (75°F) and 33.8°C (92.8°F).

Temperature

The beginning of December records an average high-temperature of a hot 33.8°C (92.8°F), marking a negligible difference from November's 35.5°C (95.9°F). An average temperature of 23.9°C (75°F) marks the nights in Altos in December.

Heat index

Throughout December, the heat index is appraised at an extremely hot 43°C (109.4°F). Stay mindful: Heat exhaustion and heat cramps are likely. Heatstroke could follow extended physical effort.
Observations indicate that the heat index values are for shady locations with light wind. With direct sunlight, the heat index could increase by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel' or 'felt air temperature', unifies temperature and humidity readings to offer a comprehensive feel of warmth. An individual's temperature experience can be influenced by extra factors, including metabolic differences, activity levels, and clothing. Do note, being directly under sun rays can amplify the heat you feel, potentially raising the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are highly critical for babies and toddlers. Children regularly disregard the necessity to rest and replenish fluids. Thirst is a late symptom of dehydration - thus, maintaining hydration, particularly during long-lasting physical activities, is essential.
The body's inherent cooling system operates through perspiration, wherein evaporating sweat offsets excessive heat. When there is an excess of moisture in the atmosphere, the efficiency of the evaporation process is lessened, leading to less efficient body cooling and a sensation of overheating. 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 Altos is 64%.

Rainfall

In Altos, in December, during 20 rainfall days, 124mm (4.88") of precipitation is typically accumulated. Throughout the year, there are 220.8 rainfall days, and 1560mm (61.42") of precipitation is accumulated.

Daylight

With an average of 12h and 24min of daylight, December has the longest days of the year.
On the first day of the month, sunrise is at 05:27 and sunset at 17:50. On the last day of December, in Altos, Brazil, sunrise is at 05:40 and sunset at 18:05 -03.

Sunshine

In December, the average sunshine in Altos, Brazil, is 8.4h.

UV index

In December, the average daily maximum UV index is 7. A UV Index estimate of 6 to 7 represents a high health risk from unprotected exposure to Sun's UV rays for the ordinary person.
Note: In December, the maximum UV index of 7 suggests this advice:
Take precautions against overexposure. Protection against sun damage is needed. UV radiation from the Sun is most intense between 10 a.m. and 4 p.m. Try to avoid direct sunlight during this period. Wearing a wide-brim hat can block approximately 50% of UV radiation, protecting the eyes.