December weather forecastSanto Ângelo, Brazil

Weather in December

December, the first month of the summer in Santo Ângelo, is still a warm month, with an average temperature varying between 19.1°C (66.4°F) and 29.9°C (85.8°F).

Temperature

December's advent notes a subtle adjustment in average high-temperature to a still warm 29.9°C (85.8°F) from November. In December, Santo Ângelo records an average nighttime temperature of 19.1°C (66.4°F).

Heat index

The heat index for December is calculated to be a fiery hot 36°C (96.8°F). Exercise increased caution, heat cramps and heat exhaustion are potential hazards. Continuous activity could lead to heatstroke.
For clarity, heat index numbers account for light winds and areas under shade. With direct sunlight, the heat index could increase by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature' or 'real feel', is achieved by amalgamating air temperature with the relative humidity readings. The experience of temperature can be subjective, varying based on the individual's activity and heat perception, influenced by factors like wind, attire, and metabolic variations. Bear in mind that direct sunshine exposure increases weather impact, and may raise heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are of high significance for children. Young ones often underestimate the need for rest and rehydration. Thirst appears late in dehydration - hence, it is important to keep hydrated, particularly during prolonged physical activities.
The natural cooling mechanism in humans involves perspiration, where the evaporation of sweat balances out excessive warmth. Under high air temperature and high humidity (high heat index) conditions, the body's ability to perspire is compromised, increasing the sensation of heat. Overheating can ensue when the body accumulates more heat than it can release, and dehydration severity may vary.

Humidity

November and December, with an average relative humidity of 73%, are the least humid months in Santo Ângelo.

Rainfall

In December, in Santo Ângelo, the rain falls for 17.5 days. Throughout December, 106mm (4.17") of precipitation is accumulated. In Santo Ângelo, Brazil, during the entire year, the rain falls for 172.6 days and collects up to 1179mm (46.42") of precipitation.

Daylight

The month with the longest days is December, with an average of 13h and 54min of daylight.
On the first day of the month, sunrise is at 05:31 and sunset at 19:20. On the last day of December, sunrise is at 05:43 and sunset at 19:37 -03.

Sunshine

January, November and December, with an average of 8.8h of sunshine, are months with the most sunshine in Santo Ângelo.

UV index

January through March, October through December, with an average maximum UV index of 6, are months with the highest UV index. A UV Index estimate of 6 to 7 represents a high health vulnerability from exposure to the Sun's UV radiation for ordinary individuals.
Note: A maximum daily UV index of 6 during December morphs into the following directions:
Persist with safeguards and heed sun safety doctrines. Keeping sunburn at bay is of prime importance. Be aware that the sun's UV radiation is strongest between 10 a.m. and 4 p.m. and try to reduce direct sun exposure during this period as much as possible. A hat with a generous brim can prevent nearly 50% of UV rays from reaching your eyes.