December weather forecast
São Francisco do Piauí, Brazil

December, the first month of the summer in São Francisco do Piauí, is still a tropical month, with an average temperature fluctuating between 33.9°C (93°F) and 23.8°C (74.8°F).

Temperature

December denotes a minimal variation in the average high-temperature to a hot 33.9°C (93°F) from November's 35.2°C (95.4°F). São Francisco do Piauí experiences an average nighttime temperature of 23.8°C (74.8°F) in the month of December.

Heat index

In December, the average heat index is computed to be an extremely hot 42°C (107.6°F). Undertake extra safety actions, heat cramps and heat exhaustion are expected. Heatstroke may result from lengthy activity.
Take note of the fact that heat index values are based on shaded circumstances with light airflows. If exposed to direct sunlight, the heat index could climb by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like' or 'felt air temperature', is an amalgamation of air temperature and humidity to express the equivalent perceived temperature. The impact of weather on an individual can be subjective, affected by the person's activity and heat perception, which can vary due to elements including wind, clothing, and metabolic differences. When you're directly under the sun's rays, remember that the heat index may surge by 15 Fahrenheit (8 Celsius) degrees. Heat index values are highly critical to babies and toddlers. Young individuals usually face greater risks than adults as their sweat production is less. Also, their larger skin surface relative to their small bodies and the high heat generation due to their activity contributes to their vulnerability.
One way the human body deals with excessive warmth is by perspiring and allowing sweat to evaporate. When the air contains significant moisture, the efficiency of the evaporation process decreases, preventing the body from cooling down effectively and creating a feeling of overheating. Excessive heat that's not properly managed leads to increased body temperatures and resultant health issues.

Humidity

In December, the average relative humidity is 60%.

Rainfall

In São Francisco do Piauí, during December, the rain falls for 19.5 days and regularly aggregates up to 86mm (3.39") of precipitation. In São Francisco do Piauí, during the entire year, the rain falls for 159.4 days and collects up to 844mm (33.23") of precipitation.

Daylight

With an average of 12h and 30min of daylight, December has the longest days of the year in São Francisco do Piauí.
On the first day of December in São Francisco do Piauí, sunrise is at 05:23 and sunset at 17:54. On the last day of the month, sunrise is at 05:37 and sunset at 18:09 -03.

Sunshine

In December, the average sunshine in São Francisco do Piauí, Brazil, is 9h.

UV index

The average daily maximum UV index in December is 7. A UV Index reading of 6 to 7 represents a high health vulnerability from exposure to the Sun's UV rays for ordinary individuals.
Note: A maximum high daily UV index of 7 during December translates into the following directions:
Take precautions and adopt sun safety practices. Protection against sunburn is obliged. Stay in the shade and avoid direct Sun exposure from 10 a.m. to 4 p.m., a time when UV radiation is at its strongest, and remember that parasols or canopies do not offer full protection. Loose clothes with a tight weave are optimal for safeguarding yourself against the Sun's rays.