December weather forecast
Okanda, Sri Lanka

The first month of the winter, December, is also a moderately hot month in Okanda, Sri Lanka, with an average temperature ranging between min 24.5°C (76.1°F) and max 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 average heat index is calculated to be a very hot 35°C (95°F). Ensure extra safety measures, heat exhaustion and heat cramps are likely. Continuous activity might result in heatstroke.
Bear in mind that the heat index values are determined for shaded areas and 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 the result of factoring in humidity to the air temperature, indicating perceived warmth. The individual's temperature perception can be influenced by numerous factors such as metabolic variations, physical activity, and clothing. Awareness of direct sun exposure is crucial as it has the potential to heighten the weather's effects, pushing up the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are extremely significant 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.
The human body has a built-in cooling mechanism through perspiration; evaporating sweat dissipates the excess heat. In conditions of both high temperature and humidity (a high heat index), sweating is limited and the perception of heat is enhanced. With body temperatures on the rise, inefficient heat shedding can lead to dehydration and its associated complications.

Humidity

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

Rainfall

In Okanda, during December, the rain falls for 20.1 days and regularly aggregates up to 131mm (5.16") of precipitation. In Okanda, during the entire year, the rain falls for 192.9 days and collects up to 942mm (37.09") of precipitation.

Daylight

December has the shortest days of the year in Okanda, with an average of 11h and 42min of daylight.
On the first day of December, sunrise is at 05:59 and sunset at 17:45. On the last day of the month, sunrise is at 06:13 and sunset at 17:58 +0530.

Sunshine

With an average of 6.6h of sunshine, December has the least sunshine of the year.

UV index

January through September, November and December, with an average maximum UV index of 7, are months with the highest UV index in Okanda, Sri Lanka. A UV Index reading of 6 to 7 represents a high health vulnerability from unprotected exposure to Sun's UV rays for the ordinary person.
Note: An average UV index of 7 in December transforms into this advice:
Endorse precautions and be consistent with sun safety guidelines. Preventing sunburn is paramount. To the best of your ability, limit your exposure to the sun between the hours of 10 a.m. and 4 p.m., when UV radiation is at its peak. A hat with a broad brim is indispensable, filtering out up to half of UV rays.