December weather forecast
Marcelino Vieira, Brazil

The first month of the summer, December, is still a tropical month in Marcelino Vieira, Brazil, with an average temperature ranging between max 34°C (93.2°F) and min 23.3°C (73.9°F).

Temperature

Marcelino Vieira starts December with an average high-temperature of a still tropical 34°C (93.2°F), hinting at a minimal fluctuation from November. The average temperature drops to a moderately hot 23.3°C (73.9°F) during the night in the month of December.

Heat index

For December, the heat index is estimated at a fiery hot 39°C (102.2°F). Emphasize additional safety, risk of heat cramps and heat exhaustion is high. Continuous activity might result in heatstroke.
Take note of the fact that heat index values are based on shaded circumstances with light airflows. Direct sunlight can cause a surge in the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature' or 'feels like', ties air temperature with relative humidity to produce the perceived temperature sensation. Elements such as metabolic variations, pregnancy, and physical exertion can shape one's weather perception. With the sun shining directly, it's crucial to understand that it can increase the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are especially vital to children. Young ones often disregard the necessity to rest and hydrate. Thirst usually indicates advanced dehydration - hence, it is key to stay hydrated, particularly during ongoing physical activities.
For the human body, perspiration is the go-to method to regulate temperature, using sweat's evaporation to dissipate warmth. Under high air temperature coupled with high humidity (high heat index), the body's perspiration is reduced, intensifying the sensation of heat. As the body gains more heat than it can dissipate, there's a risk of increasing temperatures and resultant overheating.

Humidity

The average relative humidity in December in Marcelino Vieira is 52%.

Rainfall

In Marcelino Vieira, Brazil, during December, the rain falls for 12.2 days and regularly aggregates up to 35mm (1.38") of precipitation. In Marcelino Vieira, Brazil, during the entire year, the rain falls for 161.9 days and collects up to 582mm (22.91") of precipitation.

Daylight

December has the longest days of the year, with an average of 12h and 30min of daylight.
On the first day of the month, sunrise is at 05:08 and sunset at 17:35. On the last day of December, in Marcelino Vieira, sunrise is at 05:21 and sunset at 17:50 -03.

Sunshine

In December, the average sunshine in Marcelino Vieira is 9.1h.

UV index

The months with the highest UV index in Marcelino Vieira are January through March, August through December, with an average maximum UV index of 7. A UV Index reading of 6 to 7 represents a high health vulnerability from unsafe exposure to UV radiation for the ordinary person.
Note: An average UV index of 7 in December transforms into this advice:
Act on precautions and pay attention to sun safety recommendations. Avoidance of sunburn is obligatory. Be aware that the sun's UV radiation is strongest between 10 a.m. and 4 p.m. and try to reduce direct sun exposure during this period as much as possible. A wide-brim hat offers excellent sun protection for the eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure.