December weather forecast
Uduwana, Sri Lanka

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

Temperature

December's advent notes a subtle adjustment in average high-temperature to a moderately hot 29.7°C (85.5°F) from November. Uduwana temperatures generally rest at a low of 24.1°C (75.4°F) during the December nights.

Heat index

Throughout December, the heat index is appraised at a fiery hot 36°C (96.8°F). Implement additional safety measures to avoid heat cramps and heat exhaustion. Persistent activity might trigger heatstroke.
Regarding the heat index, one should be aware it's determined by shaded settings and mild winds. Direct sunlight might cause an increase of up to 15 Fahrenheit (8 Celsius) degrees in the heat index.
Note: The heat index, also known as 'apparent temperature' or 'feels like', is what the temperature feels like to the human body when the air temperature is combined with the relative humidity. This impact is subjective, influenced by the person's physical activity and individual heat perception, affected by factors including wind, attire, and metabolic differences. Keep aware, the sun, when shining directly, can intensify the heat experience, pushing the heat index up by 15 Fahrenheit (8 Celsius) degrees. Heat index values are quite important for children. Children frequently do not comprehend the need for rest and hydration. Thirst is an advanced stage of dehydration - staying hydrated, especially during extended physical exercises, is essential.
When temperatures rise, the human body turns to perspiration, using the cooling power of evaporating sweat. During conditions of high air temperature and humidity (high heat index), the body's ability to perspire is inhibited, increasing the sensation of warmth. With body temperatures on the rise, inefficient heat shedding can lead to dehydration and its associated complications.

Humidity

The average relative humidity in December is 79%.

Rainfall

In Uduwana, during December, the rain falls for 19.9 days and regularly aggregates up to 124mm (4.88") of precipitation. Throughout the year, there are 272.3 rainfall days, and 2039mm (80.28") of precipitation is accumulated.

Daylight

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

Sunshine

In Uduwana, the average sunshine in December is 7h.

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. A UV Index reading of 6 to 7 represents a high health hazard from exposure to the Sun's UV rays for the ordinary person.
Note: An average UV index of 7 in December transforms into this advice:
Persist with precautions and heed sun safety advice. Prevention of sunburn is compulsory. Be aware that the sun's UV radiation is strongest between 10 a.m. and 4 p.m. and try to reduce direct sun exposure during this period as much as possible. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects.