December weather forecastKeratsini, Greece

December

Weather in December

The first month of the winter, December, is still a refreshing month in Keratsini, Greece, with an average temperature fluctuating between 13.9°C (57°F) and 9.2°C (48.6°F).

Temperature

December's arrival comes with a mild decrease in the average high-temperature, moving subtly from an enjoyable 18°C (64.4°F) in November to a mild 13.9°C (57°F). In December, Keratsini's nighttime temperatures demonstrate a slight decrease, stabilizing at an average of 9.2°C (48.6°F).

Humidity

In Keratsini, the average relative humidity in December is 72%.

Rainfall

The month with the most rainfall is December, when the rain falls for 9.2 days and typically aggregates up to 39mm (1.54") of precipitation.

Snowfall

Months with snowfall are January through March and December. The months with the most snowfall are January, February and December, with an average 4mm (0.16") of accumulated snow.

Sea temperature

In Keratsini, in December, the average water temperature is 16.6°C (61.9°F).
Note: For most, swimming in 16.6°C (61.9°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

With an average of 9h and 36min of daylight, December has the shortest days of the year in Keratsini, Greece.
On the first day of December, sunrise is at 07:22 and sunset at 17:06. On the last day of the month, sunrise is at 07:41 and sunset at 17:16 EET.

Sunshine

In Keratsini, Greece, the average sunshine in December is 5.9h.

UV index

The month with the lowest UV index is December, with an average maximum UV index of 2. A UV Index estimate of 2, and below, represents a low health risk from exposure to the Sun's UV radiation for ordinary individuals.
Note: A typical high UV index of 2 in December suggests the following recommendations:
Prolonged sun exposure generally does not trouble most people. However, it is vital to ensure protection for babies, children, and individuals with sensitive skin. Considering the Sun's intensity during midday, it's wise to minimize direct exposure. To mitigate harm from sun exposure, pick sunglasses offering UVA and UVB defense. Watch out! The Sun's UV radiation can be nearly magnified twofold due to snow reflection.

Updated: Jan 24, 2024
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

In Keratsini, in December, the average high-temperature is 13.9°C (57°F), and the average low-temperature is 9.2°C (48.6°F). The average heat index (a.k.a. 'feels like', 'real feel'), which represents the influence of relative humidity on air temperature, in September is evaluated at 28°C (82.4°F).

In December, the average relative humidity in Keratsini, Greece, is 72%.

The month with the most rainfall in Keratsini is December, when the rain falls for 9.2 days and typically aggregates up to 39mm (1.54") of precipitation.

In Keratsini, in December, it is raining for 9.2 days, with typically 39mm (1.54") of accumulated precipitation.

The months with the most snowfall in Keratsini are January, February and December, with an average 4mm (0.16") of accumulated snow.

December is the first month it typically snows in Keratsini. Throughout December, in the average 0.1 snowfall days, it receives 4mm (0.16") of snow.

In Keratsini, Greece, in December, the average water temperature is 16.6°C (61.9°F). Swimming in 16.6°C (61.9°F) is not enjoyable for the majority. Controlling breathing becomes progressively more difficult as surface water temperature decreases below 21°C (69.8°F).

The month with the shortest days is December, with an average of 9h and 36min of daylight.

In December, the average day length in Keratsini is 9h and 35min.

In December, on the first day of the month, sunrise is at 07:22 and sunset at 17:06. On the last day of the month, in Keratsini, sunrise is at 07:41 and sunset at 17:16 EET.

The average sunshine duration in December in Keratsini is 5.9h.

With an average maximum UV index of 2, December is the month with the lowest UV index in Keratsini, Greece.

The average daily maximum UV index in December in Keratsini, Greece, is 2. A UV Index estimate of 2, and below, represents a minimal hazard to health from exposure to the Sun's UV radiation.

Today

Tomorrow

Long-term

Year J F M A M J J A S O N December

Nov

December

Jan

Average high temperature

18°C

13.9°C

11.9°C

Average low temperature

Average pressure

Average wind speed

Average max. wind speed

14.1km/h

15.1km/h

16km/h

Average wind speed gusts

Average humidity

Average rainfall

Average rainfall days

Average snowfall

Average snowfall days

0.1

0.9

Average sea temperature

Average daylight

Average sunshine

Average sunshine days

19.5

19.7

18.4

Average UV index

Average cloud cover

Average visibility

Average temperature in December
Keratsini, Greece

Average high temperature in December: 13.9°C

The warmest month (with the highest average high temperature) is July (31.1°C).
The month with the lowest average high temperature is January (11.9°C).

Average low temperature in December: 9.2°C

The month with the highest average low temperature is August (24.1°C).
The coldest month (with the lowest average low temperature) is January (7.2°C).

Average pressure in December
Keratsini, Greece

Average pressure in December: 1018.2mbar

The month with the highest atmospheric pressure is December (1018.2mbar).
The month with the lowest atmospheric pressure is July (1011.1mbar).

Average wind speed in December
Keratsini, Greece

Average wind speed in December: 13.9km/h

The windiest month (with the highest average wind speed) is August (15.7km/h).
The calmest month (with the lowest average wind speed) is May (11.4km/h).

Average humidity in December
Keratsini, Greece

Average humidity in December: 72%

The month with the highest relative humidity is January (73%).
The months with the lowest relative humidity are July and August (50%).

Average rainfall in December
Keratsini, Greece

Average rainfall in December: 39mm

The wettest month (with the highest rainfall) is December (39mm).
The driest month (with the least rainfall) is August (4mm).

Average rainfall days in December
Keratsini, Greece

Average rainfall days in December: 9.2 days

The month with the highest number of rainy days is March (9.9 days).
The month with the least rainy days is August (2 days).

Average snowfall in December
Keratsini, Greece

Average snowfall in December: 4mm

The months with the highest snowfall are January, February and December (4mm).
The months with the least snowfall are April, May, June, July, August, September, October and November (0mm).

Average snowfall days in December
Keratsini, Greece

Average snowfall days in December: 0.1 days

The month with the highest number of snowfall days is January (0.9 days).
The months with the least snowfall days are April, May, June, July, August, September, October and November (0 days).

Average sea temperature in December
Keratsini, Greece

Average sea temperature in December: 16.6°C

The best month for swimming (with the highest average sea temperature) is August (26.3°C).
The coldest month (with the lowest average sea temperature) is February (15°C).

Average daylight in December /
Average sunshine in December
Keratsini, Greece

Average daylight in December: 9h and 36min

The month with the longest days is June (Average daylight: 14h and 48min).
The month with the shortest days is December (Average daylight: 9h and 36min).

Average sunshine in December: 5h and 54min

The month with the most sunshine is August (Average sunshine: 12h and 0min).
The month with the least sunshine is January (Average sunshine: 5h and 42min).

Average sunshine days in December
Keratsini, Greece

Average sunshine days in December: 19.7 days

The month with the most sunshine days is August (27.5 days).
The month with the least sunshine days is February (16.3 days).

Average UV index in December
Keratsini, Greece

Average UV index in December: 2

The months with the highest UV index are June, July and August (UV index 7).
The month with the lowest UV index is December (UV index 2).

Average cloud cover in December
Keratsini, Greece

Average cloud cover in December: 35

The month with the most cloud cover is January (Cloud cover 39).
The month with the least cloud cover is August (Cloud cover 7).

Average visibility in December
Keratsini, Greece

Average visibility in December: 10km

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