December weather forecast
Jaffna, Sri Lanka

Weather in December

December, the first month of the winter, in Jaffna, is also a moderately hot month, with average temperature ranging between min 26.1°C (79°F) and max 27.5°C (81.5°F).

Temperature

In Jaffna, the average high-temperature in December is almost the same as in November - a still moderately hot 27.5°C (81.5°F). In December, in Jaffna, the average low-temperature is 26.1°C (79°F).

Heat index

The average heat index is appraised at a hot 30.6°C (87.1°F). Exhaustion is likely with prolonged exposure and activity. Sustaining activity may result in heat cramps.
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 'felt air temperature', 'feels like', 'apparent temperature', or 'real feel', is an index that combines air temperature and relative humidity to determine the human-perceived temperature equivalent. Additional factors like clothing, pregnancy, wind, and activity influence one's weather impression. Be aware that direct exposure to sunlight increases heat impact and may raise the 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.

Humidity

The average relative humidity in Jaffna, Sri Lanka, is 78%.

Rainfall

In Jaffna, Sri Lanka,, it is raining for 20 days, with typically 140mm (5.51") of accumulated precipitation. In Jaffna, Sri Lanka, during the entire year, the rain falls for 148.6 days and collects up to 769mm (30.28") of precipitation.

Sea temperature

In December, the average sea temperature in Jaffna, Sri Lanka, is 27.3°C (81.1°F).
Note: For swimming, diving, and other water activities, temperatures between 25°C (77°F) and 29°C (84.2°F) are perceived as very enjoyable and pleasurable for prolonged periods without feeling uncomfortable.

Daylight

January and December, with an average of 11.6h of daylight, are months with the shortest days in Jaffna.

Sunshine

December has the least sunshine of the year in Jaffna, Sri Lanka, with an average of 5.5h of sunshine.

UV index

January through October and December, with an average maximum UV index of 7, are months with the highest UV index. A UV Index estimate of 6 to 7 represents a high threat to health from unsafe exposure to the UV radiation for ordinary individuals.
Note: The daily maximum UV index of 7 interpret into the following advice:
Take precautions against overexposure. Fair-skinned people may get burned in less than 20 minutes. 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. Beware! The strength of the UV rays is significantly increased by the reflection of the water and sand.
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FAQ

What is the temperature in December in Jaffna?

The average high-temperature, in December, in Jaffna, is 27.5°C (81.5°F), while the average low-temperature is 26.1°C (79°F). In December, the average heat index (a.k.a. 'apparent temperature', 'felt air temperature'), which represents the influence of relative humidity on air temperature, is appraised at 30.6°C (87.1°F).

What is the average humidity in December in Jaffna?

In December, the average relative humidity is 78%.

How much does it rain in Jaffna in December?

In Jaffna, in December, during 20 rainfall days, 140mm (5.51") of precipitation is typically accumulated.

What is the sea water temperature in December in Jaffna?

In Jaffna, in December, the average water temperature is 27.3°C (81.1°F). Water temperature between 25°C (77°F) and 29°C (84.2°F) is regarded as very warm and enjoyable by all. With these temperatures, water activities are pleasurable, without feeling uncomfortable for prolonged periods.

What is the month with the shortest days in Jaffna?

January and December, with an average of 11.6h of daylight, are months with the shortest days.

How many hours of daylight does Jaffna have in December?

The average length of the day in December in Jaffna is 11.6h.

What is the month with the least sunshine in Jaffna?

The month with the least sunshine in Jaffna, Sri Lanka, is December, with an average of 5.5h of sunshine.

How long on average sun shines in December in Jaffna?

In Jaffna, the average sunshine in December is 5.5h.

What is the month with the highest UV index in Jaffna?

January through October and December, with an average maximum UV index of 7, are months with the highest UV index in Jaffna.

What is the UV index reading in December in Jaffna?

In Jaffna, the average daily maximum UV index in December is 7. A UV Index estimate of 6 to 7 represents a high health vulnerability from the exposure to the Sun's UV radiation.

Average temperature in December
Jaffna, Sri Lanka

Average temperature in December - Jaffna, Sri Lanka
  • Average high temperature in December: 27.5°C

The warmest month (with the highest average high temperature) is April (30.4°C).
The month with the lowest average high temperature is January (26.8°C).

  • Average low temperature in December: 26.1°C

The month with the highest average low temperature is May (29°C).
The coldest month (with the lowest average low temperature) is January (25.5°C).

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Average pressure in December
Jaffna, Sri Lanka

Average pressure in December - Jaffna, Sri Lanka
  • Average pressure in December: 1010.9mbar

The month with the highest atmospheric pressure is January (1012.5mbar).
The month with the lowest atmospheric pressure is June (1005.9mbar).

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Average wind speed in December
Jaffna, Sri Lanka

Average wind speed in December - Jaffna, Sri Lanka
  • Average wind speed in December: 23.1km/h

The windiest month (with the highest average wind speed) is June (33.8km/h).
The calmest months (with the lowest average wind speed) are March and April (16.7km/h).

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Average humidity in December
Jaffna, Sri Lanka

Average humidity in December - Jaffna, Sri Lanka
  • Average humidity in December: 78%

Months with the highest relative humidity are May, August and September (79%).
The month with the lowest relative humidity is March (75%).

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Average rainfall in December
Jaffna, Sri Lanka

Average rainfall in December - Jaffna, Sri Lanka
  • Average rainfall in December: 140mm

The wettest month (with the highest rainfall) is October (191mm).
The driest month (with the least rainfall) is March (13mm).

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Average rainfall days in December
Jaffna, Sri Lanka

Average rainfall days in December - Jaffna, Sri Lanka
  • Average rainfall days in December: 20 days

The month with the highest number of rainy days is October (22.6 days).
The month with the least rainy days is March (5.8 days).

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Average sea temperature in December
Jaffna, Sri Lanka

Average sea temperature in December - Jaffna, Sri Lanka
  • Average sea temperature in December: 27.3°C

The best month for swimming (with the highest average sea temperature) is April (30.1°C).
The coldest month (with the lowest average sea temperature) is January (26.8°C).

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

Average daylight in December / Average sunshine in December - Jaffna, Sri Lanka
  • Average daylight in December: 11.6h

The month with the longest days is June (Average daylight: 12.7h).
Months with the shortest days are January and December (Average daylight: 11.6h).

  • Average sunshine in December: 5.5h

The month with the most sunshine is June (Average sunshine: 11.6h).
The month with the least sunshine is December (Average sunshine: 5.5h).

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Average sunshine days in December
Jaffna, Sri Lanka

Average sunshine days in December - Jaffna, Sri Lanka
  • Average sunshine days in December: 7 days

The month with the most sunshine days is March (23.9 days).
The month with the least sunshine days is November (6.3 days).

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Average UV index in December
Jaffna, Sri Lanka

Average UV index in December - Jaffna, Sri Lanka
  • Average UV index in December: 7

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

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Average cloud cover in December
Jaffna, Sri Lanka

Average cloud cover in December - Jaffna, Sri Lanka
  • Average cloud cover in December: 47

The month with the most cloud cover is December (Cloud cover 47).
The month with the least cloud cover is March (Cloud cover 16).

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Average visibility in December
Jaffna, Sri Lanka

Average visibility in December - Jaffna, Sri Lanka
  • Average visibility in December: 10km

Months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (10km).
Months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (10km).

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