December weather forecast
Osvaldo Cruz, Brazil

The first month of the summer, December, is also a moderately hot month in Osvaldo Cruz, Brazil, with an average temperature fluctuating between 29.6°C (85.3°F) and 20.7°C (69.3°F).

Temperature

In December, Osvaldo Cruz's weather conditions record an average high-temperature of a moderately hot 29.6°C (85.3°F), demonstrating little divergence from the preceding month. Throughout December, an average low-temperature of 20.7°C (69.3°F) is experienced in Osvaldo Cruz.

Heat index

December's heat index is evaluated at a fiery hot 36°C (96.8°F). Ensure additional precautions, heat exhaustion and heat cramps may be expected. Heatstroke could occur from sustained activity.
When considering the heat index, it's pivotal to note it is for shade and mild wind conditions. If directly exposed to the sun, the heat index could rise by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature' or 'real feel', is found by incorporating humidity levels into the air temperature measurement. Factors such as metabolic variations, being pregnant, and physical activity can impact an individual's weather perception. Being aware that direct sunlight can impact the felt heat might mean an increase in the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are primarily vital for children. In general, children are more at risk than adults because they sweat less. Furthermore, the large skin surface compared to their small bodies and the high heat production due to their actions contribute to this vulnerability.
The physiological way the human body responds to excessive heat is by inducing perspiration, using sweat evaporation as a cooling mechanism. When there is an excess of moisture in the atmosphere, the efficiency of the evaporation process is lessened, leading to less efficient body cooling and a sensation of overheating. Potential thermal conditions emerge as the body's heat gain outpaces its cooling mechanisms.

Humidity

The average relative humidity in December is 79%.

Rainfall

In Osvaldo Cruz, during December, the rain falls for 25.5 days and regularly aggregates up to 160mm (6.3") of precipitation. Throughout the year, in Osvaldo Cruz, there are 193.5 rainfall days, and 1136mm (44.72") of precipitation is accumulated.

Daylight

December has the longest days of the year, with an average of 13h and 24min of daylight.
On the first day of the month, sunrise is at 05:31 and sunset at 18:53. On the last day of December, sunrise is at 05:43 and sunset at 19:10 -03.

Sunshine

In December, the average sunshine is 7.7h.

UV index

The months with the highest UV index in Osvaldo Cruz are January through March, July through December, with an average maximum UV index of 6. A UV Index of 6 to 7 symbolizes a high health vulnerability from exposure to the Sun's UV radiation for average individuals.
Note: In December, the maximum UV index of 6 translates into these guidelines:
Implement preventive steps and embrace sun safety standards. Protection from skin and eye distress is compulsory. Seek shade and limit direct sun exposure between 10 a.m. and 4 p.m., the peak period for UV radiation. Keep in mind that shade structures like parasols or canopies do not offer complete sun protection. Sunglasses providing both UVA and UVB protection are non-negotiable on sunlit days.