December weather forecastManacapuru, Brazil

Weather in December

December, the first month of the summer in Manacapuru, is still a hot month, with an average temperature varying between 31.4°C (88.5°F) and 23.6°C (74.5°F).

Temperature

The arrival of December sees a recorded average high-temperature of a still tropical 31.4°C (88.5°F), showing little divergence from the previous month's conditions. Manacapuru's temperature lowers to a mean of 23.6°C (74.5°F) during the nights in December.

Heat index

The heat index for December is calculated to be a blisteringly hot 43°C (109.4°F). Attention: Heat exhaustion and heat cramps are quite likely. Heatstroke becomes a risk with continued exertion.
Metrics for the heat index primarily focus on shaded spots and light wind conditions. The heat index may scale up by 15 Fahrenheit (8 Celsius) degrees with direct sun exposure.
Note: The heat index, also known as 'feels like' or 'apparent temperature', joins air temperature with relative humidity to produce a temperature perception for humans. The impact of weather is personal, differing among a variety of people based on differences in body mass, height, and the level of physical exertion. Keep it in mind, direct sunlight can augment the heat you experience, possibly pushing the heat index up by 15 Fahrenheit (8 Celsius) degrees. Heat index values hold particular importance for children. Children often miss understanding the importance of rest and rehydration. Thirst usually appears late during dehydration - therefore, maintaining hydration, particularly during long physical activities, is essential.
The natural method the human body uses to remove excess heat is by perspiring and letting sweat evaporate. Under high air temperature and high humidity (high heat index) conditions, the body's ability to perspire is compromised, increasing the sensation of heat. When heat gain exceeds the level the body can remove, body temperature begins to rise, and heat-related illnesses and disorders may develop.

Humidity

In Manacapuru, the average relative humidity in December is 81%.

Rainfall

In Manacapuru, during December, the rain falls for 27.5 days and regularly aggregates up to 196mm (7.72") of precipitation. Throughout the year, there are 269.3 rainfall days, and 1638mm (64.49") of precipitation is accumulated.

Daylight

The month with the longest days in Manacapuru is December, with an average of 12h and 18min of daylight.
On the first day of the month, sunrise is at 05:42 and sunset at 18:00. On the last day of December, sunrise is at 05:56 and sunset at 18:15 -04.

Sunshine

In Manacapuru, the average sunshine in December is 8.6h.

UV index

The months with the lowest UV index in Manacapuru are January, March through May and December, with an average maximum UV index of 6. A UV Index value of 6 to 7 symbolizes a high health risk from unprotected exposure to Sun's UV rays for ordinary individuals.
Note: In December, the average maximum UV index of 6 translates into the following recommendations:
Stand by precautions and apply sun safety measures. Evading sunburn is of great importance. UV radiation from the sun is at its strongest between 10 a.m. and 4 p.m. Try to limit direct exposure during these hours. Sunglasses providing both UVA and UVB protection are non-negotiable on sunlit days.