December weather forecast
Chillán, Chile

Concluding the calendar year, December brings the return of summer to Chillán. Temperatures reach up to 27.6°C (81.7°F), and the weather retains minimal rainfall, with mere 12mm (0.47") across the month. High pressure, increased sunshine hours, and the longest daylight period of the year sum up the climatology for December. Despite this quick shift towards warm weather, humidity remains relatively low, offering content weather conditions for various outdoor activities. Hence, it can be asserted that December in Chillán not only marks the year-end but also the commencement of another climatological cycle filled with diversity and intriguing weather phenomena.

Temperature

December's onset in Chillán is marked by a subtle temperature increase, moving from a moderately hot 23.8°C (74.8°F) in November to a still warm 27.6°C (81.7°F). Despite the high peak temperatures, Chillán witnesses an average nighttime cooling to a cool 11.2°C (52.2°F) in December.

Heat index

In December, the average heat index is computed to be 29°C (84.2°F). With extended exposure and activity, one might feel exhausted and experience heat cramps.
Evaluating the heat index requires understanding its values in the shade and with gentle winds. Heat index values can rise by 15 Fahrenheit (8 Celsius) degrees when in direct sunlight.
Note: The heat index, also known as 'feels like' or 'felt air temperature', is a numerical representation of warmth when taking temperature and moisture levels into account. The individual's experience of temperature can be shaped by numerous aspects such as metabolic variations, physical exertion, and attire. Direct exposure to the sun's rays can enhance the felt temperature, increasing the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are primarily vital for children. Young ones are generally at greater risk than adults due to their limited sweating ability. In addition, their large skin surface relative to their small bodies and higher heat production from their activities add to their vulnerability.

Humidity

In Chillán, the average relative humidity in December is 56%.

Rainfall

In Chillán, during December, the rain falls for 3.4 days and regularly aggregates up to 12mm (0.47") of precipitation. Throughout the year, there are 88.3 rainfall days, and 706mm (27.8") of precipitation is accumulated.

Daylight

The month with the longest days in Chillán is December, with an average of 14h and 36min of daylight.
On the first day of the month, sunrise is at 06:23 and sunset at 20:52. On the last day of December, in Chillán, sunrise is at 06:33 and sunset at 21:10 -03.

Sunshine

In December, the average sunshine is 10.8h.

UV index

The average daily maximum UV index in December in Chillán is 5. A UV Index of 3 to 5 symbolizes a moderate threat to health from exposure to the Sun's UV radiation for the ordinary person.
Note: A maximum high daily UV index of 5 during December translates into the following directions:
Ensure safety - Recommendations to avert sunburn are presented. To protect against the Sun's most potent rays, avoid direct exposure around midday. A wide-brimmed hat provides unparalleled sun protection for sensitive areas like the eyes, ears, and neck.