December weather forecast
Mecca, Saudi Arabia

The first month of the winter, December, is still a tropical month in Mecca, Saudi Arabia, with an average temperature ranging between min 20.3°C (68.5°F) and max 32°C (89.6°F).

Temperature

In Mecca, the average high-temperature in December marginally drops from a very hot 35.2°C (95.4°F) in November to a tropical 32°C (89.6°F). In Mecca, in December, the average low-temperature is 20.3°C (68.5°F).

Heat index

In December, the average heat index is appraised at a sweltering 37°C (98.6°F). Take special precautions - heat exhaustion and heat cramps are expected. Heatstroke may occur with lengthy activity.
Note that heat index values are valued for light wind and location in the shade. Exposure to direct sunshine can increase heat index values by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature', 'real feel', 'feels like', or 'apparent temperature', is a calculated temperature value of how hot it feels when the moisture in the air is factored in. Additional factors like wind, clothing, pregnancy, and activity influence one's weather impression. Bear in mind that direct sunshine exposure increases weather impact, and may raise heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly important for children. Young children are generally more endangered than adults, as they usually less sweat. And also, due to larger skin surface relative to their small bodies and higher heat production as a result of their activity.
To prevent overheating and help regulate its internal temperature, the human body sweat and rely on the evaporation to cool down. With a lot of moisture in the air, the evaporation process is not as effective, and the body does not cool down as efficiently, creating a perception of overheating. When heat gain exceeds the level the body can remove, body temperature begins to rise, and heat-related illnesses and disorders may develop.

Humidity

December is the most humid month, with an average relative humidity of 59%.

Rainfall

In Mecca, during December, the rain falls for 3.6 days and regularly aggregates up to 22mm (0.87") of precipitation. In Mecca, during the entire year, the rain falls for 22.4 days and collects up to 112mm (4.41") of precipitation.

Daylight

The month with the shortest days in Mecca is December, with an average of 10h and 52min of daylight.
On the first day of the month, sunrise is at 06:41 and sunset at 17:37. On the last day of December, sunrise is at 06:57 and sunset at 17:49 +03.

Sunshine

December has the least sunshine of the year in Mecca, with an average of 8h of sunshine.

UV index

The months with the lowest UV index are January and December, with an average maximum UV index of 7. A UV Index estimate of 6 to 7 represents a high health risk from unsafe exposure to UV radiation for ordinary individuals.
Note: In December, the average maximum UV index of 7 translate into the following recommendations:
Take precautions and utilize sun safety practices. Protection against skin and eye damage is required. The Sun's UV radiation is most powerful between 10 a.m. and 4 p.m. To the extent possible, limit exposure to the direct sun during these hours. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes.