December weather forecastMatão, Brazil

Weather in December

The first month of the summer, December, is also a moderately hot month in Matão, Brazil, with an average temperature fluctuating between 29.1°C (84.4°F) and 20.3°C (68.5°F).

Temperature

Matão records an average high-temperature of a still warm 29.1°C (84.4°F) as December arrives, nearly mirroring the previous month's climate. Matão, during the nights of December, experiences an average temperature drop to an agreeable 20.3°C (68.5°F).

Heat index

December's mean heat index is evaluated at a torrid 35°C (95°F). Preventive measures are required to mitigate the risk of heat cramps and heat exhaustion. Continuous activity may precipitate heatstroke.
Bear in mind that the heat index values are determined for shaded areas and light breezes. The heat index has the potential to rise by 15 Fahrenheit (8 Celsius) degrees with direct sunshine exposure.
Note: The heat index, also known as 'feels like' or 'real feel', embodies the combination of air temperature and moisture content to illustrate perceived heat. This effect is personal, shaped by the individual's physical activity and heat sensitivity, influenced by factors including wind, clothing, and metabolic variances. Under direct sun rays, the felt temperature might be heightened, with the heat index increasing by 15 Fahrenheit (8 Celsius) degrees. Heat index values are especially crucial for babies and toddlers. Children commonly overlook the importance of rest and fluid replenishment. Thirst, being a delayed sign of dehydration, emphasizes the need to keep hydration up, especially during lengthy physical activities.
Sweat evaporation, driven by perspiration, is the method the human body uses to rid itself of excessive warmth. With high air temperature and humidity (high heat index) conditions, sweat production is restricted, leading to an amplified perception of heat. When the body's heat gain surpasses its removal capacity, body temperature starts to climb, leading to potential heat-related ailments.

Humidity

In Matão, the average relative humidity in December is 81%.

Rainfall

In Matão, during December, the rain falls for 29.2 days and regularly aggregates up to 193mm (7.6") of precipitation. In Matão, during the entire year, the rain falls for 215.1 days and collects up to 1334mm (52.52") of precipitation.

Daylight

With an average of 13h and 24min of daylight, December has the longest days of the year.
On the first day of the month, sunrise is at 05:21 and sunset at 18:43. On the last day of December, sunrise is at 05:33 and sunset at 18:59 -03.

Sunshine

The average sunshine in December is 7.7h.

UV index

The months with the highest UV index are January, March, July through December, with an average maximum UV index of 6. A UV Index of 6 to 7 symbolizes a high health vulnerability from unsafe exposure to UV radiation for the ordinary person.
Note: The UV index of 6 in December translates into these instructions:
Stick with precautions and abide by sun safety procedures. Evading sunburn is essential. Limit your direct sun exposure, especially between 10 a.m. and 4 p.m., when UV radiation is strongest. Shade structures might not provide complete sun protection. A hat with a generous brim can prevent nearly 50% of UV rays from reaching your eyes.