Alonnisos
Greece
Long-term weather forecast
Long-term weather forecast

December weather forecast and climate
Alonnisos, Greece

December, the first month of the winter, in Alonnisos, is still a mild month, with average temperature varying between 13°C (55.4°F) and 6°C (42.8°F).

Temperature

In Alonnisos, the average high-temperature slightly decreases, from a comfortable 16°C (60.8°F) in November, to a moderate 13°C (55.4°F). In December, the average low-temperature is 6°C (42.8°F).

Rainfall

December is the month with the most rainfall in Alonnisos. Rain falls for 10 days and accumulates 119mm (4.7") of precipitation.

Sea temperature

In Alonnisos, the average water temperature is 15°C (59°F).
Note: For most, swimming in 15°C (59°F) is not an enjoyable activity. Furthermore, controlling your breathing becomes progressively more difficult as the water temperature decreases from 21°C (69.8°F) to 15°C (59°F).

Daylight

December has the shortest days of the year, with an average of 9.5h of daylight.

Sunshine

Months with the least sunshine are January and December, with an average of 4h of sunshine.

UV index

January, November and December, with an average maximum UV index of 2, are months with the lowest UV index in Alonnisos. A UV Index of 2, and less, symbolizes a minimal health hazard from the exposure to the Sun's UV rays for the ordinary person.
Note: In December, the average maximum UV index of 2 translate into the following recommendations:
Most people can stay in the Sun for up to 1 hour without burning, apart from children that always must be protected from sun exposure. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes.

What is the temperature in December in Alonnisos?

The average high-temperature, in December, is 13°C (55.4°F), while the average low-temperature is 6°C (42.8°F).

How many days does it rain in December in Alonnisos?

In Alonnisos, Greece, in December, during 10 rainfall days, 119mm (4.7") of precipitation is typically accumulated.

What is the rainiest month in Alonnisos?

December is the month with the most rainfall. Rain falls for 10 days and accumulates 119mm (4.7") of precipitation.

How cold is the water in December in Alonnisos?

In December, the average sea temperature in Alonnisos is 15°C (59°F). For most, swimming in 15°C (59°F) is not an enjoyable activity. Furthermore, controlling your breathing becomes progressively more difficult as the water temperature decreases from 21°C (69.8°F) to 15°C (59°F).

What is the month with the shortest days in Alonnisos?

The month with the shortest days in Alonnisos is December, with an average of 9.5h of daylight.

How many hours of daylight does Alonnisos have in December?

In Alonnisos, the average length of the day in December is 9.5h.

What is the month with the least sunshine in Alonnisos?

January and December, with an average of 4h of sunshine, are months with the least sunshine in Alonnisos, Greece.

How many hours of sunshine does Alonnisos have in December?

In December, the average sunshine in Alonnisos is 4h.

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

Months with the lowest UV index in Alonnisos, Greece, are January, November and December, with an average maximum UV index of 2.

How high is the UV index in December in Alonnisos?

The average daily maximum UV index in December is 2. A UV Index of 2, and less, symbolizes a minimal hazard to health from unsafe exposure to the Sun's UV rays.
Average temperature in December - Alonnisos, Greece
  • Average high temperature in December: 13°C

Warmest months (with the highest average high temperature) are July and August (28°C).
The month with the lowest average high temperature is January (10°C).

  • Average low temperature in December: 6°C

Months with the highest average low temperature are July and August (19°C).
The coldest month (with the lowest average low temperature) is January (4°C).

Average rainfall in December - Alonnisos, Greece
  • Average rainfall in December: 119mm

The wettest month (with the highest rainfall) is December (119mm).
The driest month (with the lowest rainfall) is July (22mm).

Average rainfall days in December - Alonnisos, Greece
  • Average rainfall days in December: 10 days

The month with the highest number of rainy days is December (10 days).
Months with the lowest number of rainy days are July, August and September (3 days).

Average sea temperature in December - Alonnisos, Greece
  • Average sea temperature in December: 15°C

Best months for swimming (with the highest average sea temperature) are July and August (24°C).
Coldest months (with the lowest average sea temperature) are January, February and March (14°C).

Average daylight in December / Average sunshine in December - Alonnisos, Greece
  • Average daylight in December: 9.5h

The month with the longest days is June (Average daylight: 14.9h).
The month with shortest days is December (Average daylight: 9.5h).

  • Average sunshine in December: 4h

The month with most sunshine is July (Average sunshine: 13h).
Months with least sunshine are January and December (Average sunshine: 4).

Average UV index in December - Alonnisos, Greece
  • Average UV index in December: 2

Months with the highest UV index are June and July (UV index 9).
Months with the lowest UV index are January, November and December (UV index 2).