December weather forecast
Cuiabá, Brazil

December usually has nearly similar weather conditions to November, with an increase in daytime temperatures to an average high of 32.5°C (90.5°F). The weather retains a delicate balance between maintaining the warmth and preparing for the next year. December also experiences increased rainfall, marking a clear transition from the dry period to a wetter season. With a UV Index of 12 coupled with 6 hours of sunshine, sun protection remains necessary and essential. Wrapping up the year, December combines various elements of Cuiabá's weather, making it an exciting conclusion to the distinct Brazilian climate.

Temperature

During December, Cuiabá records an average high-temperature of a still tropical 32.5°C (90.5°F), marking a slight divergence from November's 31.1°C (88°F). In the month of December, Cuiabá witnesses a consistent average low-temperature of 23°C (73.4°F).

Heat index

In December, the average heat index is evaluated at a life-threatening hot 45°C (113°F). Vigilance: Heat cramps and heat exhaustion are likely. The likelihood of heatstroke increases with continued activity.
Understanding the heat index involves considering values for shaded locales with light wind. A direct sunlight exposure may boost the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature' or 'apparent temperature', takes into account both air temperature and humidity to illustrate what people actually feel. Factors such as metabolic variation, pregnancy, and physical activity play a role in one's impression of weather. Awareness of direct sun exposure is crucial as it has the potential to heighten the weather's effects, pushing up the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly relevant to babies and toddlers. 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.
Evaporating sweat, an outcome of perspiration, is key in assisting the human body to moderate its temperature. With higher relative humidity, the rate of evaporation is reduced, resulting in increased heat retention in the body compared to drier air. Exceeding the body's heat disposal threshold results in a rise in body temperature and potential thermal disorders.

Humidity

The average relative humidity in December is 77%.

Rainfall

In December, the rain falls for 17 days. Throughout December, 194mm (7.64") of precipitation is accumulated. In Cuiabá, Brazil, during the entire year, the rain falls for 124 days and collects up to 1315mm (51.77") of precipitation.

Daylight

December has the longest days of the year in Cuiabá, with an average of 13h and 0min of daylight.
On the first day of the month, sunrise is at 05:03 and sunset at 18:03. On the last day of December, sunrise is at 05:16 and sunset at 18:18 -04.

Sunshine

In December, the average sunshine in Cuiabá, Brazil, is 6h.

UV index

January through March, September through December, with an average maximum UV index of 12, are months with the highest UV index in Cuiabá, Brazil. A UV Index of 11, and more, symbolizes an extreme threat to health from exposure to the Sun's UV radiation for ordinary individuals.
Note: In December, the maximum UV index of 12 suggests this advice:
Execute all vital precautions. Preventing sun damage is of utmost importance. Stay out of direct sunlight between 10 a.m. and 4 p.m., when UV radiation is most intense, and remember that not all shade structures provide complete protection. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects. Sunscreen of at least SPF 30 should be applied generously and reapplied often on overcast days, especially post swim or outdoor exercise.