December weather forecast
Welikanda, Sri Lanka

The first month of the winter, December, is also a moderately hot month in Welikanda, Sri Lanka, with temperature in the range of an average low of 21.4°C (70.5°F) and an average high of 29.3°C (84.7°F).

Temperature

January and December are identified as the coldest months, with an average high-temperature of 29.3°C (84.7°F).

Heat index

The heat index value for December is estimated at a fiery hot 37°C (98.6°F). Implement more safety precautions, heat cramps and heat exhaustion may happen. Persistent activity could induce heatstroke.
Be informed that the heat index values are oriented around shady conditions and gentle breezes. Uninterrupted exposure to the sun may boost the heat index values by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel' or 'felt air temperature', quantifies the warmth felt when relative humidity is considered. One's perception of temperature is subjective, varying based on their activity and individual heat perception, influenced by factors like wind, clothing, and metabolic variations. 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 highly critical for babies and toddlers. In general, children are more at risk than adults because they sweat less. Furthermore, the large skin surface compared to their small bodies and the high heat production due to their actions contribute to this vulnerability.
Perspiring is how the human body naturally cools down, as sweat's evaporation takes away excess heat. An increase in relative humidity retards evaporation, subsequently reducing the body's heat removal rate and leading to a sensation of being overly warm. When heat gain exceeds the level the body can remove, body temperature begins to rise, and heat-related illnesses and disorders may develop.

Humidity

The most humid month in Welikanda, Sri Lanka, is December, with an average relative humidity of 84%.

Rainfall

In December, in Welikanda, the rain falls for 22.9 days. Throughout December, 127mm (5") of precipitation is accumulated. In Welikanda, Sri Lanka, during the entire year, the rain falls for 196.8 days and collects up to 943mm (37.13") of precipitation.

Daylight

December has the shortest days of the year in Welikanda, with an average of 11h and 42min of daylight.
On the first day of December in Welikanda, Sri Lanka, sunrise is at 06:03 and sunset at 17:44. On the last day of the month, sunrise is at 06:17 and sunset at 17:58 +0530.

Sunshine

With an average of 4.9h of sunshine, December has the least sunshine of the year in Welikanda.

UV index

The months with the lowest UV index are January, November and December, with an average maximum UV index of 6. A UV Index reading of 6 to 7 represents a high health hazard from exposure to the Sun's UV radiation for the average person.
Note: A maximum UV index of 6 in December translates into the following recommendations:
Take precautions and utilize sun safety practices. Protection against skin and eye damage is required. The Sun's UV radiation is most powerful between 10 a.m. and 4 p.m. To the extent possible, limit exposure to the direct sun during these hours. In the presence of strong sunlight, it's crucial to wear sunglasses that ward off UVA and UVB rays.