December weather forecastAriyalur, India

Weather in December

December, the first month of the winter in Ariyalur, is still a warm month, with an average temperature fluctuating between 28.9°C (84°F) and 21.7°C (71.1°F).

Temperature

December is Ariyalur's coldest month, registering average high temperatures of 28.9°C (84°F) and lows of 21.7°C (71.1°F).

Heat index

In December, the average heat index is calculated to be a very hot 35°C (95°F). More safety actions are required, heat exhaustion and heat cramps are probable. Long-term activity may precipitate heatstroke.
Data suggests that the heat index is set for environments in shade and with a light wind. Direct exposure to sunlight could raise the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like' or 'apparent temperature', is an index that combines air temperature and relative humidity to determine the human-perceived temperature equivalent. This effect tends to be personal, with the weather perception differing among individuals due to variations in body mass, height, and exertion. Consider the sun's direct rays and their impact; they can potentially increase the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly relevant to children. Children frequently underestimate the necessity to rest and hydrate. Thirst is a late sign of dehydration - thus, it is vital to stay hydrated, particularly during lengthy physical exercises.
Evaporating sweat, thanks to perspiration, acts as a natural air conditioner for the human body. An upsurge in relative humidity affects normal body cooling mechanisms by slowing evaporation, hence reducing the rate at which the body cools and intensifying the perception of heat. Overheating and dehydration threats arise when heat gain goes beyond what the body can comfortably shed.

Humidity

November and December, with an average relative humidity of 81%, are the most humid months in Ariyalur.

Rainfall

In Ariyalur, during December, the rain falls for 17 days and regularly aggregates up to 72mm (2.83") of precipitation. In Ariyalur, during the entire year, the rain falls for 178.4 days and collects up to 608mm (23.94") of precipitation.

Daylight

December has the shortest days of the year in Ariyalur, India, with an average of 11h and 30min of daylight.
On the first day of the month, sunrise is at 6:17 am and sunset at 5:48 pm. On the last day of December, sunrise is at 6:32 am and sunset at 6:01 pm IST.

Sunshine

The months with the least sunshine are November and December, with an average of 5.6h of sunshine.

UV index

January, October through December, with an average maximum UV index of 6, are months with the lowest UV index in Ariyalur. A UV Index estimate of 6 to 7 represents a high health vulnerability from exposure to the Sun's UV radiation for average individuals.
Note: In December, a daily maximum UV index of 6 leads to the following instructions:
Apply measures and align with sun safety principles. Safeguarding against skin and eye injury is pivotal. Seek shade and limit direct sun exposure between 10 a.m. and 4 p.m., the peak period for UV radiation. Keep in mind that shade structures like parasols or canopies do not offer complete sun protection. Protect your eyes, ears, face, and neck from the Sun by wearing a wide-brimmed hat.