December weather forecast
Niwanthidiya, Sri Lanka

The first month of the winter, December, is still a warm month in Niwanthidiya, Sri Lanka, with an average temperature ranging between max 29.7°C (85.5°F) and min 24.1°C (75.4°F).

Temperature

The commencement of December notes an average high-temperature of a moderately hot 29.7°C (85.5°F), exhibiting little difference from the previous month. December nights in Niwanthidiya cool down to an average low-temperature of 24.1°C (75.4°F).

Heat index

During December, the heat index is computed to be a very hot 36°C (96.8°F). Implement heightened safety measures - risk of heat exhaustion and heat cramps is increased. Prolonged activity may result in heatstroke.
The standards for the heat index are set for locations in shade and under light breezes. Direct exposure to sunlight could raise the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature' or 'feels like', is an aggregate value of air's warmth and moisture to show the human-felt temperature. Factors such as metabolic variations, being pregnant, and physical activity can impact an individual's weather perception. By being directly under the sun, it's possible for the felt temperature to increase by 15 Fahrenheit (8 Celsius) degrees. Heat index values are largely significant for babies and toddlers. Younglings are generally more in peril than adults due to their reduced perspiration. Coupled with a larger skin surface relative to their tiny bodies and greater heat production because of their activity, they become more at risk.
To combat high temperatures, the human body perspires and relies on sweat evaporation for cooling. When the relative humidity is high, the evaporation rate is reduced. The warmth is removed from the body at a lower rate, causing the body to retain more heat than it would in dry air. Inadequate heat shedding in the face of rising body temperatures hints at potential dehydration risks.

Humidity

In Niwanthidiya, the average relative humidity in December is 79%.

Rainfall

In Niwanthidiya, in December, during 19.9 rainfall days, 124mm (4.88") of precipitation is typically accumulated. Throughout the year, there are 272.3 rainfall days, and 2039mm (80.28") of precipitation is accumulated.

Daylight

The month with the shortest days in Niwanthidiya is December, with an average of 11h and 42min of daylight.
On the first day of December in Niwanthidiya, Sri Lanka, sunrise is at 06:06 and sunset at 17:52. On the last day of the month, sunrise is at 06:21 and sunset at 18:05 +0530.

Sunshine

The average sunshine in December in Niwanthidiya is 7h.

UV index

The months with the highest UV index are January through April, July, September, November and December, with an average maximum UV index of 7. A UV Index reading of 6 to 7 represents a high threat to health from unsafe exposure to UV radiation for average individuals.
Note: A maximum UV index of 7 in December translates into the following recommendations:
Persist with precautions and heed sun safety advice. Prevention of sunburn is compulsory. Avoid direct exposure to the Sun between 10 a.m. and 4 p.m., the peak period for UV radiation, noting that objects like parasols or canopies might not offer complete sun protection. To cut down UV radiation exposure by about half, sport a wide-brim hat.