December weather forecast
Barretos, Brazil

The first month of the summer, December, is still a warm month in Barretos, Brazil, with an average temperature varying between 28.7°C (83.7°F) and 20.5°C (68.9°F).

Temperature

The onset of December manifests an average high-temperature of a still moderately hot 28.7°C (83.7°F), demonstrating a minor variation from the preceding month. Throughout December, the nighttime temperature averages to an agreeable 20.5°C (68.9°F).

Heat index

December's heat index is estimated at a very hot 35°C (95°F). Adopt enhanced safety measures, heat exhaustion and heat cramps could occur. Continuous activity may induce heatstroke.
One should consider that heat index numbers are for shaded settings and light wind. The heat index has the possibility to be enhanced by 15 Fahrenheit (8 Celsius) degrees when there is direct sun exposure.
Note: The heat index, also known as 'felt air temperature' or 'real feel', stands as a testimony to how temperature and humidity combine to impact our sense of warmth. One's weather perception can be influenced by a range of factors including metabolic differences, being pregnant, and their level of physical activity. It is important to note that direct sunlight can intensify the weather impact, potentially raising the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are highly critical for babies and toddlers. Juveniles often do not understand the need to recuperate and rehydrate. Thirst is a delayed symptom of dehydration - hence, it is vital to maintain hydration, particularly during ongoing physical activities.
The process of perspiration is vital for the human body to get rid of excess warmth by allowing sweat to 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 body heat isn't effectively managed, risks of dehydration and overheating amplify.

Humidity

In Barretos, the average relative humidity in December is 84%.

Rainfall

In Barretos, during December, the rain falls for 27.6 days and regularly aggregates up to 183mm (7.2") of precipitation. In Barretos, during the entire year, the rain falls for 211.9 days and collects up to 1351mm (53.19") of precipitation.

Daylight

December has the longest days of the year in Barretos, with an average of 13h and 24min of daylight.
On the first day of December, sunrise is at 05:24 and sunset at 18:42. On the last day of the month, sunrise is at 05:36 and sunset at 18:58 -03.

Sunshine

In December, the average sunshine is 7.4h.

UV index

The months with the lowest UV index are January, February, April, May and December, with an average maximum UV index of 5. A UV Index reading of 3 to 5 represents a medium health hazard from unsafe exposure to UV radiation for ordinary individuals.
Note: The daily high UV index of 5 during December translates into the following recommendations:
Ensure safety - Sun damage prevention is strongly urged. Sun's radiation is most powerful around mid-day, so it's best to limit outdoor activities during this time. Wearing a wide-brim hat can block approximately 50% of UV radiation, protecting the eyes.