December weather forecast
Dalugama, Sri Lanka

The first month of the winter, December, is also a moderately hot month in Dalugama, Sri Lanka, with an average temperature varying between 23.7°C (74.7°F) and 29.9°C (85.8°F).

Temperature

The onset of December marks an average high-temperature of a moderately hot 29.9°C (85.8°F), hardly differing from November's 30.1°C (86.2°F). In Dalugama, the average temperature during the nights of December drops to a still warm 23.7°C (74.7°F).

Heat index

December's heat index is evaluated at a sweltering 37°C (98.6°F). Adopt extra safety steps, risk of heat exhaustion and heat cramps is notable. Sustained activity might cause heatstroke.
Factoring in the heat index, values are geared towards shaded areas with light breezes. The heat index values could be amplified by up to 15 Fahrenheit (8 Celsius) degrees in direct sunlight.
Note: The heat index, also known as 'felt air temperature' or 'apparent temperature', is an index that combines air temperature and relative humidity to determine the human-perceived temperature equivalent. Metabolic differences, pregnancy status, and the level of physical activity are additional factors influencing an individual's weather perception. When in direct sunlight, one should be cautious as it can raise the heat index by as much as 15 Fahrenheit (8 Celsius) degrees. Heat index values hold particular importance for children. Young children are more at risk than adults since they tend to sweat less. Moreover, their large skin surface in proportion to their small bodies and the high heat production due to their activities contribute to their vulnerability.
The physiological way the human body responds to excessive heat is by inducing perspiration, using sweat evaporation as a cooling mechanism. Under conditions of increased relative humidity, the evaporation rate lessens, causing the body to retain more heat than under less humid conditions. When heat uptake goes beyond the body's cooling mechanisms, there's a surge in body temperature, posing health risks.

Humidity

In December, the average relative humidity in Dalugama is 79%.

Rainfall

In Dalugama, in December, during 21.1 rainfall days, 148mm (5.83") of precipitation is typically accumulated. Throughout the year, in Dalugama, there are 289.4 rainfall days, and 2262mm (89.06") of precipitation is accumulated.

Daylight

December has the shortest days of the year, with an average of 11h and 42min of daylight.
On the first day of December, sunrise is at 06:06 and sunset at 17:51. On the last day of the month, sunrise is at 06:21 and sunset at 18:05 +0530.

Sunshine

The average sunshine in December 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 in Dalugama. A UV Index of 6 to 7 symbolizes a high threat to health from unprotected exposure to Sun's UV rays for the average person.
Note: The UV index of 7 during December leads to these advisories:
Resist overexposure. Safeguarding from solar damage is indispensable. Be aware that the sun's UV radiation is strongest between 10 a.m. and 4 p.m. and try to reduce direct sun exposure during this period as much as possible. Boost your sun resistance with garments that are densely woven yet spacious.