December weather forecast
Ranwediyawa, Sri Lanka

The first month of the winter, December, is also a moderately hot month in Ranwediyawa, Sri Lanka, with temperature in the range of an average high of 29.3°C (84.7°F) and an average low of 21.4°C (70.5°F).

Temperature

Ranwediyawa's coldest season falls during January and December, averaging a high-temperature of 29.3°C (84.7°F).

Heat index

In December, the heat index is computed to be a very hot 37°C (98.6°F). Undertake special precautions, the probability of heat exhaustion and heat cramps is high. Prolonged activity may provoke heatstroke.
When considering the heat index, it's pivotal to note it is for shade and mild wind conditions. In the presence of direct sunshine, the heat index could be augmented by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like' or 'real feel', is a measure that combines air temperature and relative humidity into a single value that indicates how hot the weather feels. The perception of temperature can be subjective, varying based on activity and individual heat sensitivity, influenced by factors like wind, attire, and metabolic variations. The sun, when shining directly, can have a significant impact on the perceived temperature, increasing the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are of high significance for children. Young ones often underestimate the need for rest and rehydration. Thirst appears late in dehydration - hence, it is important to keep hydrated, particularly during prolonged physical activities.
Perspiration is the human body's physiological response to high temperatures and is an attempt to lower body temperature through 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. As the body gains more heat than it can dissipate, there's a risk of increasing temperatures and resultant overheating.

Humidity

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

Rainfall

In Ranwediyawa, in December, it is raining for 22.9 days, with typically 127mm (5") of accumulated precipitation. In Ranwediyawa, Sri Lanka, during the entire year, the rain falls for 196.8 days and collects up to 943mm (37.13") of precipitation.

Daylight

With an average of 11h and 42min of daylight, December has the shortest days of the year in Ranwediyawa, Sri Lanka.
On the first day of the month, sunrise is at 06:05 and sunset at 17:48. On the last day of December, sunrise is at 06:20 and sunset at 18:01 +0530.

Sunshine

December has the least sunshine of the year in Ranwediyawa, with an average of 4.9h of sunshine.

UV index

The months with the lowest UV index are January, November and December, with an average maximum UV index of 6. A UV Index reading of 6 to 7 represents a high health hazard from exposure to the Sun's UV radiation for average individuals.
Note: During December, 6 as the daily maximum UV index converts into the following advice:
Uphold preventive measures and conform to sun safety guidelines. Defending against skin and eye harm is crucial. 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. Enhance your sun protection with tightly woven, yet airy clothing.