December weather forecast and climate
Sigiriya, Sri Lanka

Weather in December

December, the first month of the winter, in Sigiriya, is also a moderately hot month, with average temperature fluctuating between 29.3°C (84.7°F) and 21.4°C (70.5°F).

Temperature

January and December, with an average high-temperature of 29.3°C (84.7°F), are the coldest months.

Heat index

The average heat index is computed to be a very hot 36.6°C (97.9°F). Take special precautions - heat exhaustion and heat cramps are expected. Heatstroke may occur with lengthy activity.
Take into consideration that the heat index values are calculated for shade and light wind conditions. With exposure to direct sunlight, the heat index may be increased by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like', 'felt air temperature', 'apparent temperature', or 'real feel', is what the temperature feels like to the human body when the air temperature is combined with the relative humidity. Additional factors like activity, clothing, metabolic differences, and differences in body mass, height, and shape affect individual temperature impact. Bear in mind that direct sunshine exposure increases weather impact, and may raise heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly important for children. Young children are generally more endangered than adults, as they usually less sweat. And also, due to larger skin surface relative to their small bodies and higher heat production as a result of their activity.
The human body normally cools itself by perspiration. Excessive warmth is eliminated from the body by evaporation of sweat. High relative humidity reduces the evaporation rate, resulting in a lower heat removal rate from the body, causing the perception of being overheated. If the body can not disperse the excessive heat and body temperature reaches conditions of hyperthermia, above 37.5°C (99.5°F) to 38.3°C (100.9°F), thermal conditions are potentially life-threatening.

Humidity

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

Rainfall

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

Daylight

January and December, with an average of 11.7h of daylight, are months with the shortest days in Sigiriya.

Sunshine

The month with the least sunshine in Sigiriya, Sri Lanka, is December, with an average of 4.9h of sunshine.

UV index

January, November and December, with an average maximum UV index of 6, are months with the lowest UV index. A UV Index reading of 6 to 7 represents a high threat to health from the exposure to the Sun's UV radiation for ordinary individuals.
Note: In December, the average maximum UV index of 6 translate into the following recommendations:
Take precautions and adopt sun safety practices. Protection against sunburn is obliged. Seek shade and minimize exposure to direct Sun in a period between 10 a.m. and 4 p.m. when UV radiation is most intense; keep in mind that shade structures like parasols or canopies do not provide perfect sun protection. 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.
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FAQ

What is the coldest month in Sigiriya?

The coldest months are January and December, with an average high-temperature of 29.3°C (84.7°F).

What is the temperature in December in Sigiriya?

In Sigiriya, in December, the average high-temperature is 29.3°C (84.7°F), and the average low-temperature is 21.4°C (70.5°F). In December, the average heat index (a.k.a. 'apparent temperature', 'felt air temperature'), which combines air temperature and relative humidity, is computed to be 36.6°C (97.9°F).

What is the most humid month in Sigiriya?

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

What is the average humidity in December in Sigiriya?

In December, the average relative humidity in Sigiriya is 84%.

How much does it rain in Sigiriya in December?

In Sigiriya, during December, the rain falls for 22.9 days and regularly aggregates up to 127mm (5") of precipitation.

What is the month with the shortest days in Sigiriya?

January and December, with an average of 11.7h of daylight, are months with the shortest days in Sigiriya.

What is the average length of the day in December in Sigiriya?

In Sigiriya, Sri Lanka, the average length of the day in December is 11.7h.

What is the month with the least sunshine in Sigiriya?

With an average of 4.9h of sunshine, December has the least sunshine of the year in Sigiriya.

How long on average sun shines in December in Sigiriya?

In December, the average sunshine in Sigiriya is 4.9h.

What is the month with the lowest UV index in Sigiriya?

January, November and December, with an average maximum UV index of 6, are months with the lowest UV index in Sigiriya, Sri Lanka.

What is the UV index intensity in December in Sigiriya?

In Sigiriya, Sri Lanka, the average daily maximum UV index in December is 6. A UV Index reading of 6 to 7 represents a high hazard to health from the exposure to the Sun's UV radiation.

Average temperature in December
Sigiriya, Sri Lanka

Average temperature in December - Sigiriya, Sri Lanka
  • Average high temperature in December: 29.3°C

The warmest month (with the highest average high temperature) is April (34.9°C).
Months with the lowest average high temperature are January and December (29.3°C).

  • Average low temperature in December: 21.4°C

The month with the highest average low temperature is June (24.8°C).
The coldest months (with the lowest average low temperature) are January and February (20°C).

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Average pressure in December
Sigiriya, Sri Lanka

Average pressure in December - Sigiriya, Sri Lanka
  • Average pressure in December: 1010.6mbar

The month with the highest atmospheric pressure is January (1012mbar).
The month with the lowest atmospheric pressure is June (1007.5mbar).

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Average wind speed in December
Sigiriya, Sri Lanka

Average wind speed in December - Sigiriya, Sri Lanka
  • Average wind speed in December: 9.1km/h

The windiest month (with the highest average wind speed) is June (23.8km/h).
The calmest month (with the lowest average wind speed) is April (7.1km/h).

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Average humidity in December
Sigiriya, Sri Lanka

Average humidity in December - Sigiriya, Sri Lanka
  • Average humidity in December: 84%

The month with the highest relative humidity is December (84%).
Months with the lowest relative humidity are June, July, August and September (67%).

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Average rainfall in December
Sigiriya, Sri Lanka

Average rainfall in December - Sigiriya, Sri Lanka
  • Average rainfall in December: 127mm

The wettest month (with the highest rainfall) is October (214mm).
The driest month (with the least rainfall) is June (15mm).

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Average rainfall days in December
Sigiriya, Sri Lanka

Average rainfall days in December - Sigiriya, Sri Lanka
  • Average rainfall days in December: 22.9 days

The month with the highest number of rainy days is November (24.1 days).
The month with the least rainy days is June (7.8 days).

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Average daylight in December /
Average sunshine in December
Sigiriya, Sri Lanka

Average daylight in December / Average sunshine in December - Sigiriya, Sri Lanka
  • Average daylight in December: 11.7h

The month with the longest days is June (Average daylight: 12.6h).
Months with the shortest days are January and December (Average daylight: 11.7h).

  • Average sunshine in December: 4.9h

The month with the most sunshine is June (Average sunshine: 11.3h).
The month with the least sunshine is December (Average sunshine: 4.9h).

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Average sunshine days in December
Sigiriya, Sri Lanka

Average sunshine days in December - Sigiriya, Sri Lanka
  • Average sunshine days in December: 5.9 days

The month with the most sunshine days is July (16 days).
The month with the least sunshine days is November (4.2 days).

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Average UV index in December
Sigiriya, Sri Lanka

Average UV index in December - Sigiriya, Sri Lanka
  • Average UV index in December: 6

Months with the highest UV index are February, March, April, May, June, July, August, September and October (UV index 7).
Months with the lowest UV index are January, November and December (UV index 6).

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Average cloud cover in December
Sigiriya, Sri Lanka

Average cloud cover in December - Sigiriya, Sri Lanka
  • Average cloud cover in December: 56

The month with the most cloud cover is December (Cloud cover 56).
The month with the least cloud cover is May (Cloud cover 26).

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Average visibility in December
Sigiriya, Sri Lanka

Average visibility in December - Sigiriya, Sri Lanka
  • Average visibility in December: 7km

Months with the highest visibility are May, June, July, August and September (10km).
Months with the lowest visibility are January and December (7km).

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