December weather forecastJanuária, Brazil

Weather in December

December, the first month of the summer in Januária, is still a warm month, with an average temperature ranging between max 28.9°C (84°F) and min 19.6°C (67.3°F).

Temperature

The shift into December records an average high-temperature of a still moderately hot 28.9°C (84°F), subtly varied from November's 29.5°C (85.1°F). December nights observe an average temperature dip to a refreshing 19.6°C (67.3°F).

Heat index

For most parts of December, the heat index is appraised at a very hot 35°C (95°F). Exercise extra preventive actions, heat cramps and heat exhaustion are plausible. Continuous activity could result in heatstroke.
The heat index's values are generally associated with conditions in shade and light breezes. Under direct sunshine, the heat index values might be elevated by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel' or 'apparent temperature', gives a temperature feeling by integrating air temperature and humidity. Factors encompassing physical activity, clothing, and metabolic differences have a role in shaping the individual's impression of temperature. Realize that direct exposure to sunlight can augment the felt heat, leading to a potential increase in the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values remain especially vital for babies and toddlers. Young children are more at risk than adults since they tend to sweat less. Moreover, their large skin surface in proportion to their small bodies and the high heat production due to their activities contribute to their vulnerability.
The body's self-cooling mechanism is rooted in perspiration, where evaporating sweat cools down excessive warmth. 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. Overheating risks increase with rising body temperatures, especially if heat release isn't efficient.

Humidity

The average relative humidity in December in Januária, Brazil, is 81%.

Rainfall

The month with the most rainfall is December, when the rain falls for 20.7 days and typically aggregates up to 120mm (4.72") of precipitation.

Daylight

With an average of 13h and 0min of daylight, December has the longest days of the year in Januária.
On the first day of December in Januária, sunrise is at 05:17 and sunset at 18:16. On the last day of the month, sunrise is at 05:29 and sunset at 18:31 -03.

Sunshine

In Januária, Brazil, the average sunshine in December is 7.9h.

UV index

The months with the lowest UV index in Januária, Brazil, are January through July, October through December, with an average maximum UV index of 6. A UV Index value of 6 to 7 symbolizes a high health vulnerability from exposure to the Sun's UV rays for ordinary individuals.
Note: The daily high UV index of 6 in December translates into this advice:
Skirt overexposure. People with light complexions might get scorched in under 20 minutes. Seek shade and limit direct sun exposure between 10 a.m. and 4 p.m., the peak period for UV radiation. Keep in mind that shade structures like parasols or canopies do not offer complete sun protection. Sunglasses that guard against UVA and UVB rays are pivotal in minimizing sun-induced ocular damage.