December weather forecast
Kohilawatta, Sri Lanka

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

Temperature

The transition from November to December brings an average high-temperature of a warm 29.9°C (85.8°F), barely different from November's 30.1°C (86.2°F). An average low-temperature of 23.7°C (74.7°F) is observed in Kohilawatta, Sri Lanka, during the December nights.

Heat index

In December, the average heat index is appraised at a very hot 37°C (98.6°F). Implement additional safety measures to avoid heat cramps and heat exhaustion. Persistent activity might trigger heatstroke.
Heat index values are typically calculated for conditions of shade and a light breeze. The heat index could see an increase by 15 Fahrenheit (8 Celsius) degrees under direct sunshine.
Note: The heat index, also known as 'feels like' or 'felt air temperature', combines air temperature and relative humidity to represent a human perceived temperature equivalent. Depending on the activity and the individual's heat perception, which may vary due to factors including wind, clothing, and metabolic variations, this effect remains subjective. Be aware that direct exposure to sunlight increases heat impact and may raise the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are primarily vital for children. Young children are more at risk than adults since they tend to sweat less. Moreover, their large skin surface in proportion to their small bodies and the high heat production due to their activities contribute to their vulnerability.
Evaporating sweat is a key way the human body dispels excessive warmth, all thanks to the process of perspiration. Under high air temperature and humidity (high heat index) conditions, perspiration is limited, and the perception of heat is increased. When body heat isn't effectively managed, risks of dehydration and overheating amplify.

Humidity

The average relative humidity in December in Kohilawatta is 79%.

Rainfall

In December, in Kohilawatta, the rain falls for 21.1 days. Throughout December, 148mm (5.83") of precipitation is accumulated. Throughout the year, in Kohilawatta, there are 289.4 rainfall days, and 2262mm (89.06") of precipitation is accumulated.

Daylight

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

Sunshine

The average sunshine in December is 6.9h.

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 Kohilawatta. A UV Index value of 6 to 7 symbolizes a high health hazard from exposure to the Sun's UV radiation for the ordinary person.
Note: A maximum UV index of 7 in December translates into the following recommendations:
Act on precautions and pay attention to sun safety recommendations. Avoidance of sunburn is obligatory. Remember that UV radiation from the Sun is strongest between 10 a.m. and 4 p.m. Make an effort to limit direct sun exposure during this time. Fend off the sun's harsh rays with appropriate clothing, a wide-brim hat, and UV-protective sunglasses.