December weather forecast
Dandugama, Sri Lanka

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

Temperature

The onset of December notes an average high-temperature of a warm 29.9°C (85.8°F), subtly shifted from November's 30.2°C (86.4°F). Dandugama's average low-temperature in December is measured at a still moderately hot 23.7°C (74.7°F).

Heat index

The heat index value for December is estimated at a torrid 37°C (98.6°F). Take extra safety measures to prevent heat exhaustion and heat cramps. Heatstroke could follow lengthy activity.
Take into consideration that the heat index values are calculated for shade and light wind conditions. Exposure to direct sunshine can increase heat index values by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel' or 'apparent temperature', is a calculation that merges air temperature and relative humidity to depict the sensation of warmth. Factors including metabolic differences, physical activity, and clothing are additional elements that influence the individual's temperature experience. When exposed to direct sunlight, it's possible for the heat index to increase by as much as 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly meaningful for babies and toddlers. Young children typically face greater hazards than adults because they do not sweat as much. Their larger skin surface in comparison to their little bodies and the high heat production from their active nature compounds their vulnerability.
The physiological way the human body responds to excessive heat is by inducing perspiration, using sweat evaporation as a cooling mechanism. Augmented relative humidity impedes typical body cooling mechanisms by lowering the evaporation rate, resulting in decreased body cooling and an amplified perception of heat. Increasing body temperatures can be a precursor to dehydration if the body can't shed the extra heat.

Humidity

The average relative humidity in December is 79%.

Rainfall

In December, in Dandugama, the rain falls for 20.3 days. Throughout December, 139mm (5.47") of precipitation is accumulated. In Dandugama, during the entire year, the rain falls for 265.4 days and collects up to 1744mm (68.66") of precipitation.

Daylight

The month with the shortest days in Dandugama, Sri Lanka, is December, with an average of 11h and 42min of daylight.
On the first day of the month, sunrise is at 06:07 and sunset at 17:51. On the last day of December, in Dandugama, sunrise is at 06:21 and sunset at 18:05 +0530.

Sunshine

The average sunshine in December is 7h.

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 Dandugama. A UV Index reading of 6 to 7 represents a high health vulnerability from unsafe exposure to UV radiation for ordinary individuals.
Note: In December, a regular UV index of 7 translates into these guidelines:
Endorse precautions and be consistent with sun safety guidelines. Preventing sunburn is paramount. The hours from 10 a.m. to 4 p.m. have the most intense UV radiation. As much as possible, limit direct sun exposure during this period. 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.