December weather forecast
Porto Grande, Brazil

December, the first month of the winter in Porto Grande, is still a tropical month, with temperature in the range of an average high of 31°C (87.8°F) and an average low of 25.1°C (77.2°F).

Temperature

The onset of December manifests an average high-temperature of a still tropical 31°C (87.8°F), demonstrating a minor variation from the preceding month. Porto Grande reports an average nighttime low-temperature of 25.1°C (77.2°F) in December.

Heat index

December's average heat index is computed to be a scorching 40°C (104°F). Implement additional safety measures to avoid heat cramps and heat exhaustion. Persistent activity might trigger heatstroke.
Observations indicate that the heat index values are for shady locations with light wind. Exposure to direct sunlight may make the heat index values climb by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature' or 'real feel', is calculated by taking the relative humidity value for a specific location and factoring it into the air temperature reading. Factors including metabolic differences, physical activity, and clothing are additional elements that influence the individual's temperature experience. One's exposure to direct sunlight has the potential to intensify the heat sensation, increasing the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are primarily vital 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 human body cools itself through perspiration, as excessive warmth is removed from the body through sweat evaporation. In the presence of high relative humidity, the evaporation rate diminishes, resulting in the body retaining more warmth compared to dry conditions. 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 December, the average relative humidity is 76%.

Rainfall

In Porto Grande, during December, the rain falls for 22.2 days and regularly aggregates up to 173mm (6.81") of precipitation. Throughout the year, there are 283.6 rainfall days, and 2156mm (84.88") of precipitation is accumulated.

Daylight

The month with the shortest days in Porto Grande is December, with an average of 12h and 6min of daylight.
On the first day of December in Porto Grande, sunrise is at 06:12 and sunset at 18:17. On the last day of the month, sunrise is at 06:26 and sunset at 18:31 -03.

Sunshine

In Porto Grande, Brazil, the average sunshine in December is 8.3h.

UV index

With an average maximum UV index of 6, December is the month with the lowest UV index in Porto Grande. A UV Index estimate of 6 to 7 represents a high health hazard from exposure to the Sun's UV rays for the ordinary person.
Note: The daily maximum UV index of 6 in December interprets into the following advice:
Guard oneself from overexposure. Defence against sun injury is vital. 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. Prioritize a wide-brim hat for comprehensive sun defense for your face, neck, eyes, and ears.