December weather forecast
Barra de Santo Antônio, Brazil

The first month of the summer, December, is a tropical month in Barra de Santo Antônio, Brazil, with an average temperature varying between 30.2°C (86.4°F) and 23.2°C (73.8°F).

Temperature

December denotes a minimal variation in the average high-temperature to a tropical 30.2°C (86.4°F) from November's 29.7°C (85.5°F). Barra de Santo Antônio, during the month of December, experiences an average low-temperature of 23.2°C (73.8°F).

Heat index

For most parts of December, the heat index is calculated to be a very hot 37°C (98.6°F). Adopt enhanced safety measures, heat exhaustion and heat cramps could occur. Continuous activity may induce heatstroke.
Know that the heat index computations account for shaded terrains and slight winds. Heat index values may rise by up to 15 Fahrenheit (8 Celsius) degrees when exposed to direct sunlight.
Note: The heat index, also known as 'feels like' or 'apparent temperature', measures the perceived warmth when incorporating the humidity present in the air. The influence of weather is personal, with varied individuals experiencing it differently due to differences in body mass, stature, and physical exertion levels. Keep in mind that direct sunshine exposure can amplify the weather's effects, possibly increasing the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are extremely significant for children. Young individuals are generally in more danger than adults due to their lower capacity to sweat. Moreover, their large skin surface in relation to their small bodies and the increased heat generation from their activities makes them more vulnerable.
To offset high temperatures, the human body releases sweat which, upon evaporation, cools it down. In the presence of elevated relative humidity, the evaporation rate decreases. This reduction leads to increased body heat retention compared to conditions of dry air. The body is at risk of dehydration and related complications when it fails to shed excessive heat.

Humidity

The months with the lowest humidity are March and December, with an average relative humidity of 74%.

Rainfall

In Barra de Santo Antônio, in December, it is raining for 17.2 days, with typically 27mm (1.06") of accumulated precipitation. Throughout the year, there are 256.6 rainfall days, and 686mm (27.01") of precipitation is accumulated.

Sea temperature

In December, the average sea temperature in Barra de Santo Antônio is 27.5°C (81.5°F).
Note: For swimming, diving, and various water activities, the temperatures ranging from 25°C (77°F) to 29°C (84.2°F) are seen as highly enjoyable and comfortable for extended durations without any discomfort.

Daylight

December has the longest days of the year, with an average of 12h and 42min of daylight.
On the first day of December in Barra de Santo Antônio, sunrise is at 04:52 and sunset at 17:30. On the last day of the month, sunrise is at 05:05 and sunset at 17:45 -03.

Sunshine

In December, the average sunshine is 7.9h.

UV index

The months with the highest UV index in Barra de Santo Antônio are January through March, October through December, with an average maximum UV index of 7. A UV Index reading of 6 to 7 represents a high health risk from unsafe exposure to UV radiation for average individuals.
Note: An average maximum UV index of 7 in December leads to these recommendations:
Persist with precautions and heed sun safety advice. Prevention of sunburn is compulsory. 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. In bright sunlight, prioritize sunglasses that grant protection from UVA and UVB radiation. Caution! Sand and water reflections can notably increase the UV radiation intensity.