December weather forecast
Riacho Frio, Brazil

The first month of the summer, December, is still a tropical month in Riacho Frio, Brazil, with an average temperature fluctuating between 20.3°C (68.5°F) and 31.3°C (88.3°F).

Temperature

With the advent of December, Riacho Frio experiences an average high-temperature of a still tropical 31.3°C (88.3°F), mirroring a close resemblance to the previous month. Riacho Frio reports an average nighttime low-temperature of 20.3°C (68.5°F) in December.

Heat index

The heat index value during December is estimated at a sweltering 39°C (102.2°F). Undertake additional safety actions, risk of heat cramps and heat exhaustion is significant. Persistent activity may induce heatstroke.
The metrics for the heat index are tailored for both shady environments and light winds. The heat index may experience an enhancement of 15 Fahrenheit (8 Celsius) degrees under direct sunlight.
Note: The heat index, also known as 'felt air temperature' or 'apparent temperature', is a numerical representation of warmth when taking temperature and moisture levels into account. A person's impression of weather can be swayed by numerous aspects, among them metabolic variations, pregnancy, and activity levels. One's exposure to direct sunlight has the potential to intensify the heat sensation, increasing the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are highly critical for babies and toddlers. Children are often less aware of the need to rest and re-hydrate. Thirst is a late sign of dehydration - it's vital to remain hydrated, particularly during prolonged physical activities.
Perspiring is the body's way of cooling down, particularly by allowing sweat to evaporate and take the heat with it. During high air temperature and humidity (high heat index), the process of perspiration is hindered, intensifying the sensation of heat. Accumulating heat beyond the body's cooling measures leads to rising temperatures and potential ailments.

Humidity

In Riacho Frio, the average relative humidity in December is 73%.

Rainfall

In Riacho Frio, Brazil, during December, the rain falls for 16.5 days and regularly aggregates up to 65mm (2.56") of precipitation. Throughout the year, there are 134.3 rainfall days, and 578mm (22.76") of precipitation is accumulated.

Daylight

December has the longest days of the year in Riacho Frio, with an average of 12h and 42min of daylight.
On the first day of December, sunrise is at 05:28 and sunset at 18:09. On the last day of the month, sunrise is at 05:41 and sunset at 18:24 -03.

Sunshine

With an average of 9.9h of sunshine, December has the most sunshine of the year in Riacho Frio.

UV index

The months with the lowest UV index are January through July, November and December, with an average maximum UV index of 6. A UV Index of 6 to 7 symbolizes a high health risk from exposure to the Sun's UV rays for the ordinary person.
Note: The UV index of 6 during December translates into the following guidance:
Inhibit overexposure. Warding off sun damage is of utmost importance. Avoid exposure to the Sun and try to stay in the shade between 10 a.m. and 4 p.m., when UV radiation is most potent, but be aware that parasols or canopies may not offer full protection. To cut down UV radiation exposure by about half, sport a wide-brim hat.