December weather forecast
Cachoeira, Brazil

December, the first month of the summer in Cachoeira, is still a hot month, with an average temperature fluctuating between 31.6°C (88.9°F) and 21.3°C (70.3°F).

Temperature

The beginning of December records an average high-temperature of a still hot 31.6°C (88.9°F), almost echoing the conditions of the previous month. The average temperature during December nights is registered at a pleasant 21.3°C (70.3°F).

Heat index

Throughout December, the heat index is appraised at a scorching 41°C (105.8°F). Apply extra caution, heat cramps and heat exhaustion could happen. Heatstroke might occur with long-duration activity.
Heat index determinations are made taking into account the shade and light air movements. Facing direct sunlight may hike up the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature' or 'felt air temperature', joins air temperature with relative humidity to produce a temperature perception for humans. Elements such as metabolic variations, pregnancy, and physical exertion can influence one's weather perception. It is noteworthy that being in direct sunlight can enhance the weather's impact, raising the heat index by as much as 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly meaningful for babies and toddlers. Youths are typically more endangered than adults since they usually sweat less. Their larger skin surface concerning their smaller bodies and higher heat production due to activity further adds to their vulnerability.
The body's inherent cooling system operates through perspiration, wherein evaporating sweat offsets excessive heat. When the air holds a significant amount of moisture, the efficiency of the evaporation process is decreased, preventing the body from cooling down efficiently, leading to the sensation of overheating. Should the body fail to balance its heat gain, the escalating temperature poses health challenges.

Humidity

The average relative humidity in December in Cachoeira is 75%.

Rainfall

In Cachoeira, in December, it is raining for 17.4 days, with typically 45mm (1.77") of accumulated precipitation. Throughout the year, in Cachoeira, Brazil, there are 243.3 rainfall days, and 519mm (20.43") of precipitation is accumulated.

Daylight

With an average of 12h and 54min of daylight, December has the longest days of the year.
On the first day of December, sunrise is at 05:00 and sunset at 17:49. On the last day of the month, sunrise is at 05:13 and sunset at 18:04 -03.

Sunshine

In December, the average sunshine in Cachoeira is 7.7h.

UV index

January through March and 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 vulnerability from exposure to the Sun's UV rays for average individuals.
Note: The maximum UV index of 7 during December leads to these instructions:
Follow precautions and abide by sun safety rules. Deterrence of sunburn is imperative. Try to minimize direct Sun exposure between 10 a.m. and 4 p.m., the peak period for UV radiation. Also note that objects like parasols or canopies might not provide complete sun protection. Sunglasses that guard against UVA and UVB rays are pivotal in minimizing sun-induced ocular damage.