December weather forecast
Passo, Brazil

The first month of the summer, December, is a hot month in Passo, Brazil, with an average temperature fluctuating between 31.5°C (88.7°F) and 19.7°C (67.5°F).

Temperature

Passo's weather in December, with an average high-temperature of a tropical 31.5°C (88.7°F), subtly shifts from November's 29.2°C (84.6°F). During December, the nighttime temperature in Passo averages to an enjoyable 19.7°C (67.5°F).

Heat index

For December, the heat index is appraised at a torrid 39°C (102.2°F). Special measures are necessary to avoid heat cramps and heat exhaustion. Persistent activity could result in heatstroke.
For clarity, heat index numbers account for light winds and areas under shade. The heat index could see an increase by 15 Fahrenheit (8 Celsius) degrees under direct sunshine.
Note: The heat index, also known as 'apparent temperature' or 'real feel', quantifies the warmth felt when relative humidity is considered. An individual's perception of weather can be affected by a variety of elements including metabolic differences, being pregnant, and their level of physical exertion. Recognize that direct exposure to the sun can escalate the heat effect, potentially adding 15 Fahrenheit (8 Celsius) degrees to the heat index. Heat index values are quite important for children. Young individuals usually face greater risks than adults as their sweat production is less. Also, their larger skin surface relative to their small bodies and the high heat generation due to their activity contributes to their vulnerability.
One of the main methods the human body employs to cool down is by perspiring, as this process allows sweat to evaporate and remove excess heat. When relative humidity is at high levels, the evaporation rate lessens, causing the body to keep more heat than it would in less humid conditions. Heat absorption that surpasses the body's shedding capability can lead to overheating and varying levels of dehydration.

Humidity

January and December, with an average relative humidity of 69%, are the least humid months in Passo.

Rainfall

In Passo, during December, the rain falls for 12.9 days and regularly aggregates up to 100mm (3.94") of precipitation. Throughout the year, there are 141.1 rainfall days, and 970mm (38.19") of precipitation is accumulated.

Daylight

The month with the longest days in Passo is December, with an average of 13h and 54min of daylight.
On the first day of the month, sunrise is at 05:38 and sunset at 19:28. On the last day of December, in Passo, sunrise is at 05:49 and sunset at 19:45 -03.

Sunshine

November and December, with an average of 8.9h of sunshine, are months with the most sunshine in Passo.

UV index

January and December, with an average maximum UV index of 7, are months with the highest UV index. A UV Index reading of 6 to 7 represents a high health hazard from unprotected exposure to Sun's UV rays for the ordinary person.
Note: In December, an average UV index of 7 transforms into the following instructions:
Continue precautions and advocate sun safety advice. Deterrence of sunburn is indispensable. From 10 a.m. to 4 p.m., when UV radiation is at its strongest, limit direct exposure to the Sun and note that shade structures may not provide full sun protection. Protect your eyes, ears, face, and neck from the Sun by wearing a wide-brimmed hat.