December weather forecast
Nawala, Sri Lanka

The first month of the winter, December, is still a warm month in Nawala, Sri Lanka, with an average temperature fluctuating between 29.9°C (85.8°F) and 23.7°C (74.7°F).

Temperature

As December unfolds, the average high-temperature reaches a moderately hot 29.9°C (85.8°F), hinting at a slight fluctuation from the previous month. An average low-temperature of 23.7°C (74.7°F) is observed during December nights in Nawala.

Heat index

The heat index value during December is appraised at a fiery hot 37°C (98.6°F). Ensure extra safety measures, heat exhaustion and heat cramps are likely. Continuous activity might result in heatstroke.
Note that heat index values are valued for light wind and location in the shade. The heat index has the possibility to be enhanced by 15 Fahrenheit (8 Celsius) degrees when there is direct sun exposure.
Note: The heat index, also known as 'apparent temperature' or 'felt air temperature', is a calculated temperature value of how hot it feels when the moisture in the air is factored in. Additional elements encompassing metabolic differences, the degree of physical activity, and attire can impact the individual's perception of temperature. Direct sun rays have a notable impact on perceived temperature, which can raise the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are largely significant for babies and toddlers. Kids generally face higher risks than adults as they sweat less. Along with their large skin surface compared to their small bodies and higher heat production due to their activities, their vulnerability is increased.
In high temperatures, perspiration kicks in, allowing the human body to cool down through the evaporation of sweat. A surge in relative humidity can disrupt the body's normal cooling function by slowing evaporation, hence reducing the rate at which the body cools and intensifying the perception of heat. Accumulating heat beyond the body's cooling measures leads to rising temperatures and potential ailments.

Humidity

In December, the average relative humidity is 79%.

Rainfall

In Nawala, in December, it is raining for 21.1 days, with typically 148mm (5.83") of accumulated precipitation. In Nawala, during the entire year, the rain falls for 289.4 days and collects up to 2262mm (89.06") of precipitation.

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 06:06 and sunset at 17:52. On the last day of the month, sunrise is at 06:21 and sunset at 18:05 +0530.

Sunshine

In Nawala, the average sunshine in December is 6.9h.

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 health vulnerability from unprotected exposure to Sun's UV rays for ordinary individuals.
Note: In December, an average UV index of 7 transforms into the following instructions:
Beware of overexposure. Fair-skinned individuals risk burning in less than 20 minutes. Limit your direct sun exposure, especially between 10 a.m. and 4 p.m., when UV radiation is strongest. Shade structures might not provide complete sun protection. Fend off the sun's harsh rays with appropriate clothing, a wide-brim hat, and UV-protective sunglasses.