December weather forecast
Vallam, India

December, the first month of the winter in Vallam, is still a warm month, with an average temperature ranging between min 21.5°C (70.7°F) and max 29.1°C (84.4°F).

Temperature

Vallam's December weather reaches an average high of 29.1°C (84.4°F) and an average low of 21.5°C (70.7°F), making it the coldest month.

Heat index

The heat index for December is calculated to be a sweltering 35°C (95°F). Heightened safety actions are necessary, heat cramps and heat exhaustion are probable. Persistent activity may lead to heatstroke.
Heat index values are typically calculated for conditions of shade and a light breeze. When under direct sunshine, the heat index may be elevated by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel' or 'feels like', is an index that combines air temperature and relative humidity to determine the human-perceived temperature equivalent. The influence of weather is personal, with varied individuals experiencing it differently due to differences in body mass, stature, and physical exertion levels. Sunshine, when direct, has the potential to intensify weather effects, leading to an increase in the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are extremely significant for 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.
When temperatures rise, the human body turns to perspiration, using the cooling power of evaporating sweat. When relative humidity increases, the body's capacity to evaporate heat decreases, leading to a heightened sense of warmth. Heat-related disorders may develop if heat gain in the body overshadows its cooling capacity, leading to elevated temperatures.

Humidity

In December, the average relative humidity is 79%.

Rainfall

In Vallam, India, during December, the rain falls for 16.5 days and regularly aggregates up to 58mm (2.28") of precipitation. Throughout the year, there are 145 rainfall days, and 512mm (20.16") of precipitation is accumulated.

Daylight

The month with the shortest days is December, with an average of 11h and 30min of daylight.
On the first day of December, sunrise is at 6:16 am and sunset at 5:49 pm. On the last day of the month, sunrise is at 6:31 am and sunset at 6:02 pm IST.

Sunshine

In Vallam, the average sunshine in December is 5.8h.

UV index

January, October through December, with an average maximum UV index of 6, are months with the lowest UV index. A UV Index reading of 6 to 7 represents a high threat to health from exposure to the Sun's UV rays for average individuals.
Note: The maximum UV index, 6 during December, leads to the following recommendations:
Take precautions against overexposure. Protection against sun damage is needed. Limit direct sun exposure especially between 10 a.m. and 4 p.m., when UV radiation is at its peak. However, keep in mind that shade structures may not provide full sun protection. To cut down UV radiation exposure by about half, sport a wide-brim hat.