December weather forecast
Kalmunai, Sri Lanka

As the year concludes in Kalmunai, the monsoon season reaches its peak. Despite the year drawing to a close, rainfall continues to dominate with a record 272mm (10.71"), higher than any previous month. However, average temperatures drop marginally diffusing a slight chill into the air. It is advisable to pack a raincoat or umbrella when visiting during December as rainfall is almost a daily occurrence. Thus, the year in Kalmunai ends on a wet note with monsoon at its most pronounced.

Temperature

Transitioning from November to December, Kalmunai observes an average high-temperature of a still moderately hot 28°C (82.4°F), differing subtly from the previous month. Nighttime, during December, brings an average low of 24.5°C (76.1°F), a modest reduction from the day's peak.

Heat index

For December, the heat index is estimated at a hot 32°C (89.6°F). With ongoing exposure and activity, one might experience weariness, and heat cramps could ensue.
Consider that heat index readings are for situations in the shade and light wind. Being under direct sunlight might amplify the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like' or 'real feel', reflects the blend of air temperature and relative humidity to give a temperature impression. Physical activity, clothing, and metabolic variations are additional factors that impact an individual's perception of temperature. Realize that direct exposure to sunlight can augment the felt heat, leading to a potential increase in the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are of high significance for children. Juveniles often do not understand the need to recuperate and rehydrate. Thirst is a delayed symptom of dehydration - hence, it is vital to maintain hydration, particularly during ongoing physical activities.

Humidity

The most humid month is December, with an average relative humidity of 81%.

Rainfall

December is the month with the most rainfall in Kalmunai. Rain falls for 25.2 days and accumulates 272mm (10.71") of precipitation.

Sea temperature

In Kalmunai, the average seawater temperature in December is 27.9°C (82.2°F).
Note: With water temperature from 25°C (77°F) to 29°C (84.2°F), all water activities are comfortable and delightful, devoid of discomfort even for lengthened periods.

Daylight

The month with the shortest days in Kalmunai is December, with an average of 11h and 42min of daylight.
On the first day of the month, sunrise is at 06:00 and sunset at 17:43. On the last day of December, sunrise is at 06:14 and sunset at 17:56 +0530.

Sunshine

The month with the least sunshine in Kalmunai is December, with an average of 5.4h of sunshine.

UV index

The months with the lowest UV index are November and December, with an average maximum UV index of 6. A UV Index value of 6 to 7 symbolizes a high threat to health from exposure to the Sun's UV radiation for the average person.
Note: A daily maximum UV index of 6 in December translates into the following instructions:
Apply measures and align with sun safety principles. Safeguarding against skin and eye injury is pivotal. Stay in the shade and avoid direct Sun exposure from 10 a.m. to 4 p.m., a time when UV radiation is at its strongest, and remember that parasols or canopies do not offer full protection. Wearing a wide-brim hat can block approximately 50% of UV radiation, protecting the eyes. Caution! The Sun's UV rays become stronger due to reflections from water and sand.