December weather forecast
Cacoal, Brazil

December, the first month of the summer in Cacoal, is still a warm month, with temperature in the range of an average high of 29.6°C (85.3°F) and an average low of 22.1°C (71.8°F).

Temperature

The shift into December reveals an average high-temperature of a moderately hot 29.6°C (85.3°F), closely mirroring November's climate. December sees the temperature falling to a mean low of 22.1°C (71.8°F).

Heat index

December's mean heat index is computed to be a torrid 38°C (100.4°F). Take more preventive steps, risk of heat exhaustion and heat cramps is elevated. Long activity may culminate in heatstroke.
Be informed that the heat index values are oriented around shady conditions and gentle breezes. The heat index might be elevated by 15 Fahrenheit (8 Celsius) degrees due to direct sun exposure.
Note: The heat index, also known as 'feels like' or 'felt air temperature', combines air temperature and relative humidity to represent a human perceived temperature equivalent. The individual's impression of temperature can be affected by numerous factors such as metabolic variations, physical exertion, and attire. 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 remain especially vital for babies and toddlers. 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.
The innate cooling system of the human body revolves around perspiration, with the evaporation of sweat being central to this process. Heightened relative humidity interferes with the body's usual cooling mechanism by reducing evaporation, subsequently decreasing the body's cooling rate and increasing the sensation of heat. Accumulating heat beyond the body's cooling measures leads to rising temperatures and potential ailments.

Humidity

The average relative humidity in December is 87%.

Rainfall

In Cacoal, in December, it is raining for 27.4 days, with typically 233mm (9.17") of accumulated precipitation. Throughout the year, in Cacoal, there are 235.6 rainfall days, and 1420mm (55.91") of precipitation is accumulated.

Daylight

The month with the longest days in Cacoal is December, with an average of 12h and 48min of daylight.
On the first day of the month, sunrise is at 05:32 and sunset at 18:17. On the last day of December, in Cacoal, sunrise is at 05:45 and sunset at 18:32 -04.

Sunshine

In Cacoal, the average sunshine in December is 7h.

UV index

In December, the average daily maximum UV index is 6. A UV Index of 6 to 7 symbolizes a high health hazard from unsafe exposure to UV radiation for the ordinary person.
Note: The maximum UV index, 6 during December, leads to the following recommendations:
Follow precautions and abide by sun safety rules. Deterrence of sunburn is imperative. UV radiation from the sun is at its strongest between 10 a.m. and 4 p.m. Try to limit direct exposure during these hours. Using UVA and UVB-protective sunglasses and sun-protective clothing is effective against UV radiation.