December weather forecast
Mirihana, Sri Lanka

December, the first month of the winter in Mirihana, is also a moderately hot month, with an average temperature ranging between min 23.7°C (74.7°F) and max 29.9°C (85.8°F).

Temperature

With the start of December, Mirihana measures an average high-temperature of a moderately hot 29.9°C (85.8°F), not significantly differing from November's 30.1°C (86.2°F). December nights experience a consistent temperature drop to a still warm 23.7°C (74.7°F).

Heat index

The heat index in December is computed to be a sweltering 37°C (98.6°F). Adopt heightened preventive measures, heat exhaustion and heat cramps are probable. Persistent activity could lead to heatstroke.
From a standpoint of the heat index, values pertain to shaded conditions and mild breezes. 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 'felt air temperature' or 'apparent temperature', melds the effects of warmth and moisture to generate a feeling of heat. The influence of weather is personal, with varied individuals experiencing it differently due to differences in body mass, stature, and physical exertion levels. Consider the fact that direct sun exposure can influence how hot one feels, potentially raising the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly relevant to babies and toddlers. Children often do not understand the need to rest and hydrate. Thirst is a late manifestation of dehydration - therefore, it is essential to stay hydrated, particularly during prolonged physical activities.
Normally, the human body cools itself through perspiration, which removes excessive heat by evaporating sweat. Under conditions of high relative humidity, the rate of evaporation decreases. This results in the body retaining more heat than under conditions of dry air. The body is at risk of dehydration and related complications when it fails to shed excessive heat.

Humidity

The average relative humidity in December is 79%.

Rainfall

In Mirihana, during December, the rain falls for 21.1 days and regularly aggregates up to 148mm (5.83") of precipitation. In Mirihana, during the entire year, the rain falls for 289.4 days and collects up to 2262mm (89.06") of precipitation.

Daylight

With an average of 11h and 42min of daylight, December has the shortest days of the year.
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 Mirihana, the average sunshine in December is 6.9h.

UV index

The months with the highest UV index in Mirihana are January through April, July, September, November and December, with an average maximum UV index of 7. A UV Index of 6 to 7 symbolizes a high health vulnerability from exposure to the Sun's UV rays for the ordinary person.
Note: The UV index of 7 in December translates into these instructions:
Steer clear of overexposure. Fair-skinned individuals can be scorched in less than 20 minutes. The hours from 10 a.m. to 4 p.m. have the most intense UV radiation. As much as possible, limit direct sun exposure during this period. For a sun-safe wardrobe, go for clothes that are tightly woven and generously sized.