December weather forecast
Barra Mansa, Brazil

December, the first month of the summer in Barra Mansa, is still a warm month, with an average temperature varying between 19.3°C (66.7°F) and 28.7°C (83.7°F).

Temperature

Barra Mansa indicates an average high-temperature of a still warm 28.7°C (83.7°F) in December, showing minor variation from November's 26.9°C (80.4°F). December nights in Barra Mansa observe an average temperature dip to a refreshing 19.3°C (66.7°F).

Heat index

Throughout December, the heat index is appraised at a fiery hot 35°C (95°F). Adopt heightened safety measures, heat cramps and heat exhaustion may occur. Sustained activity might cause 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 'apparent temperature' or 'real feel', melds the effects of warmth and moisture to generate a feeling of heat. The impact of weather is individual, with diverse individuals experiencing it differently due to variations in body mass, height, and activity levels. Taking into account that direct sunlight can boost the heat effect, the heat index may rise by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are essentially critical for children. Young ones are generally at greater risk than adults due to their limited sweating ability. In addition, their large skin surface relative to their small bodies and higher heat production from their activities add to their vulnerability.
The innate cooling system of the human body revolves around perspiration, with the evaporation of sweat being central to this process. Increased relative humidity slows down evaporation, thereby decreasing the rate of heat removal from the body, culminating in a sensation of overheating. Rising body temperatures resulting from an imbalance in heat absorption can lead to potential thermal issues.

Humidity

The average relative humidity in December is 84%.

Rainfall

In Barra Mansa, during December, the rain falls for 26.4 days and regularly aggregates up to 158mm (6.22") of precipitation. In Barra Mansa, Brazil, during the entire year, the rain falls for 217.8 days and collects up to 982mm (38.66") of precipitation.

Daylight

With an average of 13h and 30min of daylight, December has the longest days of the year in Barra Mansa, Brazil.
On the first day of the month, sunrise is at 05:03 and sunset at 18:28. On the last day of December, in Barra Mansa, sunrise is at 05:15 and sunset at 18:44 -03.

Sunshine

The average sunshine in December is 7.7h.

UV index

The months with the highest UV index are January through March, August, October and December, with an average maximum UV index of 6. A UV Index estimate of 6 to 7 represents a high health vulnerability from unsafe exposure to UV radiation for the average person.
Note: The maximum daily UV index of 6 in December converts into the following recommendations:
Take precautions against overexposure. Fair-skinned people may get burned in less than 20 minutes. Try to minimize direct Sun exposure between 10 a.m. and 4 p.m., the peak period for UV radiation. Also note that objects like parasols or canopies might not provide complete sun protection. For excellent sun protection for the eyes, ears, face, and neck, consider a wide-brim hat.