December weather forecast
Barra, Brazil

The first month of the summer, December, is still a hot month in Barra, Brazil, with an average temperature varying between 30.6°C (87.1°F) and 22.5°C (72.5°F).

Temperature

The commencement of December brings an average high-temperature of a still hot 30.6°C (87.1°F), marking an inconsequential divergence from November. Nightly temperatures in Barra drop to an average low of 22.5°C (72.5°F) in December.

Heat index

In December, the average heat index is calculated to be a sweltering 35°C (95°F). Implement more preventive measures, heat cramps and heat exhaustion are probable. Heatstroke might result from extended activity.
Records show heat index calculations are tailored for shaded regions and mild winds. A rise in the heat index by 15 Fahrenheit (8 Celsius) degrees may result from direct sunlight exposure.
Note: The heat index, also known as 'real feel' or 'feels like', shows a temperature sensation when both heat and moisture conditions are combined. The influence of weather is personal, differing among a variety of individuals based on differences in body mass, stature, and the level of physical activity. Always consider that direct sunlight exposure might heighten the heat's effects, pushing the heat index up by 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly meaningful for babies and toddlers. Young children are generally more endangered than adults, as they usually less sweat. And also, due to larger skin surface relative to their small bodies and higher heat production as a result of their activity.
The human body normally cools itself by perspiration. Excessive warmth is eliminated from the body by evaporation of sweat. Relative humidity in excess curtails evaporation, therefore reducing heat dissipation from the body, leading to feelings of excess heat. When heat gain surpasses the level the body can shed, body temperature begins to increase, and consequently, overheating and dehydration can occur, with varying severity.

Humidity

In Barra, Brazil, the average relative humidity in December is 66%.

Rainfall

In Barra, Brazil, in December, it is raining for 16.1 days, with typically 98mm (3.86") of accumulated precipitation. Throughout the year, in Barra, there are 121.7 rainfall days, and 646mm (25.43") of precipitation is accumulated.

Daylight

With an average of 12h and 48min of daylight, December has the longest days of the year.
On the first day of December in Barra, sunrise is at 05:19 and sunset at 18:03. On the last day of the month, sunrise is at 05:32 and sunset at 18:18 -03.

Sunshine

In December, the average sunshine in Barra is 10.9h.

UV index

June, July and December, with an average maximum UV index of 6, are months with the lowest UV index. A UV Index of 6 to 7 symbolizes a high health vulnerability from unsafe exposure to UV radiation for average individuals.
Note: An average maximum UV index of 6 in December leads to these recommendations:
Conform to measures and uphold sun safety traditions. Warding off skin and eye harm is necessary. Seek shade and limit direct Sun exposure between 10 a.m. and 4 p.m., when UV radiation is at its peak, but be aware that not all shade structures provide complete sun protection. For effective sun eye protection, rely on sunglasses certified for UVA and UVB resistance.