December weather forecast
Siriri, Brazil

The first month of the summer, December, is still a tropical month in Siriri, Brazil, with an average temperature fluctuating between 30.9°C (87.6°F) and 24°C (75.2°F).

Temperature

Siriri's shift into December is marked by a subtle change to a still hot 30.9°C (87.6°F) from November's 30.2°C (86.4°F) in temperature. Throughout the nights in December, Siriri experiences an average low-temperature of 24°C (75.2°F).

Heat index

For most parts of December, the heat index is appraised at a fiery hot 38°C (100.4°F). Take more safety measures, heat exhaustion and heat cramps are potential outcomes. Persistent activity might lead to heatstroke.
In terms of the heat index, values are set with light wind and shade conditions in mind. When exposed to the direct sun, the heat index may augment by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like' or 'felt air temperature', is found by incorporating humidity levels into the air temperature measurement. The impact of temperature is individual, as people's perception of weather may change based on their body mass, height, and physical activity. In the direct sunlight, the weather's impact can be amplified, possibly boosting the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly meaningful for babies and toddlers. Young children typically face greater hazards than adults because they do not sweat as much. Their larger skin surface in comparison to their little bodies and the high heat production from their active nature compounds their vulnerability.
Sweat evaporation, driven by perspiration, is the method the human body uses to rid itself of excessive warmth. A higher relative humidity affects normal body cooling by reducing the evaporation rate, subsequently lowering the rate at which the body cools and increasing the perception of heat. As body temperatures escalate without effective heat release, one might face dehydration threats.

Humidity

January through March and December, with an average relative humidity of 73%, are the least humid months in Siriri.

Rainfall

In Siriri, Brazil, during December, the rain falls for 12 days and regularly aggregates up to 28mm (1.1") of precipitation. Throughout the year, in Siriri, there are 211.1 rainfall days, and 584mm (22.99") of precipitation is accumulated.

Daylight

December has the longest days of the year, with an average of 12h and 42min of daylight.
On the first day of December, sunrise is at 04:56 and sunset at 17:38. On the last day of the month, sunrise is at 05:09 and sunset at 17:53 -03.

Sunshine

March and December, with an average of 8.3h of sunshine, are months with the most sunshine in Siriri, Brazil.

UV index

The months with the highest UV index are January through April, October through December, with an average maximum UV index of 7. A UV Index value of 6 to 7 symbolizes a high health risk from exposure to the Sun's UV rays for the ordinary person.
Note: The UV index of 7 during December translates into the following guidance:
Inhibit overexposure. Warding off sun damage is of utmost importance. 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. Select sunglasses that boast both UVA and UVB protection to limit the adverse effects of the sun on the eyes.