December weather forecast
Acharigama, Sri Lanka

The first month of the winter, December, is also a moderately hot month in Acharigama, Sri Lanka, with an average temperature varying between 21.7°C (71.1°F) and 29.5°C (85.1°F).

Temperature

In Acharigama, the month of December is known for its lowest average temperatures, reaching a high of 29.5°C (85.1°F) and a low of 21.7°C (71.1°F).

Heat index

Throughout December, the heat index is computed to be a very hot 37°C (98.6°F). Incorporate extra safety measures to avoid heat exhaustion and heat cramps. Continuous activity could provoke heatstroke.
Observations indicate that the heat index values are for shady locations with light wind. Heat index values may be hiked up by 15 Fahrenheit (8 Celsius) degrees under direct sunshine.
Note: The heat index, also known as 'feels like' or 'felt air temperature', comes about by integrating the temperature readings with the humidity levels. The impact of temperature is individual, as people's perception of weather may change based on their body mass, height, and physical activity. Remember, direct sunlight exposure can heighten the heat impact and might increase the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values hold particular significance for children. Children often fail to recognize the requirement to rest and rehydrate. Thirst, being a late symptom of dehydration, underlines the importance of maintaining hydration, especially during ongoing physical activities.
When faced with excessive heat, the human body begins to perspire, utilizing the cooling benefits of sweat evaporation. Augmented relative humidity impedes typical body cooling mechanisms by lowering the evaporation rate, resulting in decreased body cooling and an amplified perception of heat. Excessive heat that's not properly managed leads to increased body temperatures and resultant health issues.

Humidity

With an average relative humidity of 84%, December is the most humid month.

Rainfall

In Acharigama, during December, the rain falls for 22.4 days and regularly aggregates up to 107mm (4.21") of precipitation. Throughout the year, in Acharigama, Sri Lanka, there are 199.1 rainfall days, and 893mm (35.16") of precipitation is accumulated.

Daylight

December has the shortest days of the year in Acharigama, Sri Lanka, with an average of 11h and 42min of daylight.
On the first day of the month, sunrise is at 06:07 and sunset at 17:48. On the last day of December, in Acharigama, sunrise is at 06:22 and sunset at 18:01 +0530.

Sunshine

December has the least sunshine of the year, with an average of 5.1h of sunshine.

UV index

January, October through December, with an average maximum UV index of 6, are months with the lowest UV index in Acharigama. A UV Index estimate of 6 to 7 represents a high health hazard from unprotected exposure to Sun's UV rays for ordinary individuals.
Note: The UV index of 6 during December leads to these advisories:
Stick with precautions and abide by sun safety procedures. Evading sunburn is essential. 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. For optimum UV protection, wear sun-resistant attire complemented with a hat and quality shades.