December weather forecast
Júlio de Castilhos, Brazil

December, the first month of the summer in Júlio de Castilhos, is a tropical month, with an average temperature ranging between max 30.1°C (86.2°F) and min 18°C (64.4°F).

Temperature

As Júlio de Castilhos welcomes December, the average high-temperature is noted at a hot 30.1°C (86.2°F), closely aligning with the preceding month. Nightly average temperatures in December reveal a significant dip from daytime highs in Júlio de Castilhos, registering a consistent a comfortable 18°C (64.4°F).

Heat index

Throughout December, the heat index is estimated at a fiery hot 35°C (95°F). Exercise more precautions, heat cramps and heat exhaustion are potential risks. Continuous activity could precipitate heatstroke.
When referencing the heat index, its values are suitable for shady environments and light breezes. When exposed to the direct sun, the heat index may augment by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature' or 'felt air temperature', is found by incorporating humidity levels into the air temperature measurement. The effect is personal, with varied weather perceptions among individuals due to differences in body mass, stature, and physical activity. With the sun shining directly, it's crucial to understand that it can increase the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values hold great significance to 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.
In the face of high temperatures, the human body's reflex is to perspire, leveraging sweat evaporation for cooling. Elevated relative humidity disrupts typical body cooling by reducing the evaporation rate, consequently decreasing the body's cooling rate and enhancing the feeling of heat. Increasing body temperatures can be a precursor to dehydration if the body can't shed the extra heat.

Humidity

December is the least humid month, with an average relative humidity of 70%.

Rainfall

In Júlio de Castilhos, during December, the rain falls for 14.2 days and regularly aggregates up to 78mm (3.07") of precipitation. In Júlio de Castilhos, during the entire year, the rain falls for 146.4 days and collects up to 974mm (38.35") of precipitation.

Daylight

The month with the longest days is December, with an average of 14h and 0min of daylight.
On the first day of the month, sunrise is at 05:27 and sunset at 19:20. On the last day of December, in Júlio de Castilhos, sunrise is at 05:38 and sunset at 19:37 -03.

Sunshine

With an average of 8.7h of sunshine, December has the most sunshine of the year.

UV index

In December, the average daily maximum UV index is 6. A UV Index of 6 to 7 symbolizes a high health risk from exposure to the Sun's UV radiation for ordinary individuals.
Note: The UV index of 6 in December translates into these instructions:
Beware of overexposure. Fair-skinned individuals risk burning in less than 20 minutes. Limit your exposure to the sun's UV radiation, which is strongest between 10 a.m. and 4 p.m., and note that parasols or canopies may not provide full sun protection. For holistic sun protection encompassing the eyes, ears, face, and neck, a wide-brim hat is key.