December weather forecast
Petacalco, Mexico

The first month of the winter, December, is also a hot month in Petacalco, Mexico, with an average temperature varying between 30.4°C (86.7°F) and 22.5°C (72.5°F).

Temperature

December is marked by an average high-temperature of a still hot 30.4°C (86.7°F), almost identical to the preceding month. An average temperature of 22.5°C (72.5°F) marks the nights in Petacalco in December.

Heat index

The heat index for December is evaluated at a torrid 36°C (96.8°F). Take more preventive steps, risk of heat exhaustion and heat cramps is elevated. Long activity may culminate in heatstroke.
In reference to the heat index, it's for places in shade and with a slight wind. Direct sunlight exposure may result in a rise of the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel' or 'felt air temperature', combines air temperature and relative humidity to represent a human perceived temperature equivalent. An individual's temperature experience can be influenced by extra factors, including metabolic differences, activity levels, and clothing. Direct exposure to sun rays can potentially augment the heat sensation, elevating the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly relevant to children. In general, younger individuals are at greater risk than adults because they tend to sweat less. Also, having a larger skin surface to body size ratio and greater heat production due to their active behavior contribute to this danger.
To prevent overheating and help regulate its internal temperature, the human body sweat and rely on the evaporation to cool down. An increase in relative humidity hinders the body's normal cooling function by reducing evaporation, thereby decreasing the rate of body cooling and enhancing the sense of warmth. When heat surpasses the body's release mechanisms, dehydration and overheating risks become pronounced.

Humidity

In Petacalco, the average relative humidity in December is 68%.

Rainfall

In Petacalco, in December, during 2 rainfall days, 3mm (0.12") of precipitation is typically accumulated. In Petacalco, during the entire year, the rain falls for 78.8 days and collects up to 363mm (14.29") of precipitation.

Daylight

The month with the shortest days in Petacalco is December, with an average of 11h and 6min of daylight.
On the first day of the month, sunrise is at 7:03 am and sunset at 6:11 pm. On the last day of December, in Petacalco, Mexico, sunrise is at 7:19 am and sunset at 6:24 pm CST.

Sunshine

In Petacalco, the average sunshine in December is 9.9h.

UV index

January through December, with an average maximum UV index of 7, are months with the highest UV index. The months with the lowest UV index in Petacalco are January through December, with an average maximum UV index of 7. A UV Index of 6 to 7 symbolizes a high health hazard from exposure to the Sun's UV radiation for ordinary individuals.
Note: The maximum daily UV index of 7 in December converts into the following recommendations:
Adopt measures and apply sun safety strategies. Shielding from skin and eye damage is necessary. Avoid direct exposure to the Sun between 10 a.m. and 4 p.m., the peak period for UV radiation, noting that objects like parasols or canopies might not offer complete sun protection. To cut down UV radiation exposure by about half, sport a wide-brim hat.