December weather forecast
Rathkarawwa, Sri Lanka

The first month of the winter, December, is also a moderately hot month in Rathkarawwa, Sri Lanka, with an average temperature varying between 24.5°C (76.1°F) and 29°C (84.2°F).

Temperature

December, noted for its average high-temperature of 29°C (84.2°F) and an average low-temperature of 24.5°C (76.1°F), is considered the coldest month.

Heat index

December's mean heat index is calculated to be a very hot 35°C (95°F). Use additional protective measures, heat cramps and heat exhaustion are possible outcomes. Continuous activity might lead to heatstroke.
Understanding the heat index involves considering values for shaded locales with light wind. The heat index can potentially augment by 15 Fahrenheit (8 Celsius) degrees due to direct sunlight.
Note: The heat index, also known as 'felt air temperature' or 'feels like', is a calculated temperature value of how hot it feels when the moisture in the air is factored in. The influence of weather is personal, with varied individuals experiencing it differently due to differences in body mass, stature, and physical exertion levels. 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 extremely significant for children. Children frequently do not comprehend the need for rest and hydration. Thirst is an advanced stage of dehydration - staying hydrated, especially during extended physical exercises, is essential.
Sweat evaporation plays a crucial role in cooling the human body, a process enabled by perspiration. Increased relative humidity interferes with body cooling by slowing the rate of evaporation, resulting in a slower body cooling rate and a heightened feeling of heat. When heat gain exceeds the level the body can remove, body temperature begins to rise, and heat-related illnesses and disorders may develop.

Humidity

November and December, with an average relative humidity of 79%, are the most humid months in Rathkarawwa, Sri Lanka.

Rainfall

In Rathkarawwa, in December, during 20.1 rainfall days, 131mm (5.16") of precipitation is typically accumulated. Throughout the year, there are 192.9 rainfall days, and 942mm (37.09") 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 06:02 and sunset at 17:48. On the last day of the month, sunrise is at 06:17 and sunset at 18:01 +0530.

Sunshine

The month with the least sunshine is December, with an average of 6.6h of sunshine.

UV index

The months with the highest UV index in Rathkarawwa are January through September, November and December, with an average maximum UV index of 7. A UV Index reading of 6 to 7 represents a high health risk from exposure to the Sun's UV radiation for the average person.
Note: In December, a daily UV index of 7 turns into the following recommendations:
Guard against overexposure. Protection from sun-induced harm is essential. The Sun's UV radiation is most potent between the hours of 10 a.m. and 4 p.m. Try to avoid direct sunlight during this time. A wide-brim hat offers excellent sun protection for the eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure.