December weather forecast
Mahadeniya, Sri Lanka

December, the first month of the winter in Mahadeniya, is still a warm month, with an average temperature varying between 23.7°C (74.7°F) and 29.9°C (85.8°F).

Temperature

The transition from November to December sees average high-temperatures adjusting to a moderately hot 29.9°C (85.8°F), from a not significantly different 30.1°C (86.2°F). Mahadeniya records an average low of 23.7°C (74.7°F) throughout the nights in December.

Heat index

In December, the heat index is estimated at a sweltering 37°C (98.6°F). Greater safety measures are needed, risk of heat exhaustion and heat cramps is high. Continuous activity might trigger heatstroke.
Factoring in the heat index, values are geared towards shaded areas with light breezes. Heat index values might soar by up to 15 Fahrenheit (8 Celsius) degrees with exposure to direct sunshine.
Note: The heat index, also known as 'real feel' or 'apparent temperature', is a composite of temperature and humidity figures to convey how warm it feels. Additional elements including metabolic differences, the level of physical activity, and attire have a role in shaping the individual's temperature perception. With direct sunlight, be aware that it might enhance the heat sensation, raising the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are largely significant for babies and toddlers. 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.
Sweat evaporation, driven by perspiration, is the method the human body uses to rid itself of excessive warmth. Elevated relative humidity disrupts typical body cooling by reducing the evaporation rate, consequently decreasing the body's cooling rate and enhancing the feeling of heat. Overheating dangers loom when the body's heat release mechanisms are overshadowed by excessive gain.

Humidity

The average relative humidity in December is 79%.

Rainfall

In Mahadeniya, in December, it is raining for 21.1 days, with typically 148mm (5.83") of accumulated precipitation. In Mahadeniya, during the entire year, the rain falls for 289.4 days and collects up to 2262mm (89.06") of precipitation.

Daylight

December has the shortest days of the year, with an average of 11h and 42min of daylight.
On the first day of the month, sunrise is at 06:05 and sunset at 17:50. On the last day of December, sunrise is at 06:20 and sunset at 18:04 +0530.

Sunshine

In December, the average sunshine is 6.9h.

UV index

January through April, July, September, November and December, with an average maximum UV index of 7, are months with the highest UV index. A UV Index estimate of 6 to 7 represents a high health vulnerability from unsafe exposure to UV radiation for average individuals.
Note: The average daily UV index of 7 in December transforms into the following instructions:
Escape overexposure. People with light skin may incur burns in fewer than 20 minutes. Limit your direct sun exposure, especially between 10 a.m. and 4 p.m., when UV radiation is strongest. Shade structures might not provide complete sun protection. A wide-brimmed hat is a shield, deflecting up to 50% of harmful UV radiation from eyes.