December weather forecast
Santa Isabel do Rio Negro, Brazil

December, the first month of the summer in Santa Isabel do Rio Negro, is still a tropical month, with an average temperature fluctuating between 22.5°C (72.5°F) and 31.9°C (89.4°F).

Temperature

Welcoming December, Santa Isabel do Rio Negro notes an average high-temperature of a still hot 31.9°C (89.4°F), nearly consistent with November's 32.5°C (90.5°F). During December, the average low-temperature is recorded at a pleasant 22.5°C (72.5°F).

Heat index

For most parts of December, the heat index is estimated at a life-threatening hot 45°C (113°F). Stay alert: Heat cramps and heat exhaustion are expected. Heatstroke is a likely outcome of ongoing activity.
Metrics for the heat index primarily focus on shaded spots and light 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', offers an insight into how hot it feels when we factor in moisture content. 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. When in direct sunlight, one should be cautious as it can raise the heat index by as much as 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly important for children. Children typically face more danger than adults as their sweat production is usually lower. Additionally, the bigger skin surface compared to their small size and the increased heat due to their activeness exacerbate the risk.
The primary way humans combat excessive warmth is by perspiring, letting sweat evaporate and cool the body. A surge in relative humidity can disrupt the body's normal cooling function by slowing evaporation, hence reducing the rate at which the body cools and intensifying the perception of heat. When heat surpasses the body's release mechanisms, dehydration and overheating risks become pronounced.

Humidity

In Santa Isabel do Rio Negro, the average relative humidity in December is 82%.

Rainfall

In Santa Isabel do Rio Negro, during December, the rain falls for 27.4 days and regularly aggregates up to 171mm (6.73") of precipitation. In Santa Isabel do Rio Negro, during the entire year, the rain falls for 308 days and collects up to 1836mm (72.28") of precipitation.

Daylight

The month with the longest days in Santa Isabel do Rio Negro is December, with an average of 12h and 6min of daylight.
On the first day of the month, sunrise is at 06:04 and sunset at 18:13. On the last day of December, sunrise is at 06:18 and sunset at 18:27 -04.

Sunshine

The average sunshine in December is 7.3h.

UV index

July through December, with an average maximum UV index of 7, are months with the highest UV index. A UV Index value of 6 to 7 symbolizes a high health risk from unsafe exposure to UV radiation for the ordinary person.
Note: The average daily UV index of 7 in December transforms into the following instructions:
Steer clear of overexposure. Fair-skinned individuals can be scorched in less than 20 minutes. The Sun's UV radiation is most potent between 10 a.m. and 4 p.m. Try to limit direct exposure to the Sun during this period. A hat with a broad brim is indispensable, filtering out up to half of UV rays.