December weather forecastRio Real, Brazil

Weather in December

December, the first month of the summer in Rio Real, is still a tropical month, with an average temperature varying between 32.3°C (90.1°F) and 21.2°C (70.2°F).

Temperature

Rio Real notes an average high-temperature of a still tropical 32.3°C (90.1°F) in December, hardly diverging from November. The nighttime temperature in Rio Real dips to a pleasant 21.2°C (70.2°F) on average during December.

Heat index

Throughout December, the heat index is calculated to be a blisteringly hot 42°C (107.6°F). Implement more preventive measures, heat cramps and heat exhaustion are probable. Heatstroke might result from extended activity.
It is crucial to understand that heat index figures are for shade and gentle wind conditions. Heat index values might soar by up to 15 Fahrenheit (8 Celsius) degrees with exposure to direct sunshine.
Note: The heat index, also known as 'real feel' or 'feels like', integrates the air's temperature and its humidity to showcase the felt temperature by people. The perception of temperature can be subjective, varying based on activity and individual heat sensitivity, influenced by factors like wind, attire, and metabolic variations. When directly under the sun, the weather's impact can intensify, possibly boosting the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are largely significant for babies and toddlers. Children usually face more risks than adults as their ability to sweat is less. Additionally, their larger skin surface in relation to their petite bodies and higher heat output due to their activities increases their vulnerability.
Perspiration is essential for the human body; it facilitates cooling through the process of sweat evaporation. Under high air temperature coupled with high humidity (high heat index), the body's perspiration is reduced, intensifying the sensation of heat. Overheating can ensue when the body accumulates more heat than it can release, and dehydration severity may vary.

Humidity

February, March and December, with an average relative humidity of 72%, are the least humid months.

Rainfall

In Rio Real, in December, it is raining for 11.6 days, with typically 34mm (1.34") of accumulated precipitation. In Rio Real, during the entire year, the rain falls for 201.7 days and collects up to 430mm (16.93") of precipitation.

Daylight

The month with the longest days in Rio Real is December, with an average of 12h and 48min of daylight.
On the first day of December in Rio Real, sunrise is at 04:58 and sunset at 17:43. On the last day of the month, sunrise is at 05:11 and sunset at 17:58 -03.

Sunshine

In Rio Real, the average sunshine in December is 7.3h.

UV index

The months with the highest UV index are January through March, November and December, with an average maximum UV index of 7. A UV Index of 6 to 7 symbolizes a high health risk from exposure to the Sun's UV radiation for average individuals.
Note: A maximum UV index of 7 in December translates into the following recommendations:
Elude overexposure. Fair-skinned people could get burnt in less than 20 minutes. Avoid direct Sun exposure and seek shade between 10 a.m. and 4 p.m., when UV radiation is at its peak, but keep in mind that not all shade structures provide complete protection. A wide-brimmed hat is a staple for defending the face, eyes, ears, and neck from the Sun.