Contents
- Weather in December
- Frequently asked questions
- Average temperature in December
- Average pressure in December
- Average wind speed in December
- Average humidity in December
- Average rainfall in December
- Average rainfall days in December
- Average sea temperature in December
- Average daylight in December
- Average sunshine in December
- Average sunshine days in December
- Average UV index in December
- Average cloud cover in December
- Average visibility in December
Weather in December
Temperature
With the commencement of December, Istro records a moderate temperature decline, with the average high easing from November's comfortable 19.3°C (66.7°F) to a mild 15.9°C (60.6°F). Night temperatures during December experience a slight downturn, averaging a still refreshing 13.3°C (55.9°F).Humidity
The months with the highest humidity in Istro are January, February and December, with an average relative humidity of 72%.Rainfall
In Istro, during December, the rain falls for 10.4 days and regularly aggregates up to 24mm (0.94") of precipitation. In Istro, during the entire year, the rain falls for 64.8 days and collects up to 119mm (4.69") of precipitation.Sea temperature
In Istro, the average seawater temperature in December is 18°C (64.4°F).Note: The majority of individuals find swimming in 18°C (64.4°F) to be unenjoyable. The difficulty in controlling breathing rises as the 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 9h and 48min of daylight.On the first day of the month, sunrise is at 07:07 and sunset at 17:05. On the last day of December, in Istro, Greece, sunrise is at 07:25 and sunset at 17:15 EET.
Sunshine
The average sunshine in December in Istro is 6.5h.UV index
The months with the lowest UV index in Istro are January through March and December, with an average maximum UV index of 4. A UV Index reading of 3 to 5 represents a medium health hazard from exposure to the Sun's UV radiation for the average person.Note: In December, a daily UV index of 4 turns into the following recommendations:
Put precautions into practice - Guidance to elude sunburn is provided. Avoiding the Sun's peak radiation during midday hours is essential for health and safety. Protect your eyes, ears, face, and neck from the Sun by wearing a wide-brimmed hat.
Frequently asked questions
What are December temperatures in Istro?
What are the most humid months in Istro?
What is the average humidity in December in Istro?
How many days does it rain in December in Istro?
How cold is the water in December in Istro?
What is the month with the shortest days in Istro?
How many hours of daylight does Istro have in December?
When is the sunrise / sunset in December in Istro?
How many hours of sunshine does Istro have in December?
When is the lowest UV index in Istro?
What is the UV index reading in December in Istro?
Average temperature in December
Istro, Greece
- Average high temperature in December: 15.9°C
The warmest month (with the highest average high temperature) is August (28.1°C).
The month with the lowest average high temperature is January (14.2°C).
- Average low temperature in December: 13.3°C
The month with the highest average low temperature is August (23.7°C).
The coldest month (with the lowest average low temperature) is January (11.5°C).
Average pressure in December
Istro, Greece
- Average pressure in December: 1017.9mbar
The month with the highest atmospheric pressure is December (1017.9mbar).
The month with the lowest atmospheric pressure is July (1009mbar).
Average wind speed in December
Istro, Greece
- Average wind speed in December: 18.8km/h
The windiest month (with the highest average wind speed) is January (20.6km/h).
The calmest month (with the lowest average wind speed) is May (12.6km/h).
Average humidity in December
Istro, Greece
- Average humidity in December: 72%
The months with the highest relative humidity are January, February and December (72%).
The month with the lowest relative humidity is July (65%).
Average rainfall in December
Istro, Greece
- Average rainfall in December: 24mm
The wettest month (with the highest rainfall) is January (25mm).
The driest month (with the least rainfall) is August (0mm).
Average rainfall days in December
Istro, Greece
- Average rainfall days in December: 10.4 days
The month with the highest number of rainy days is December (10.4 days).
The month with the least rainy days is August (0.4 days).
Average sea temperature in December
Istro, Greece
- Average sea temperature in December: 18°C
The best month for swimming (with the highest average sea temperature) is August (25°C).
The coldest months (with the lowest average sea temperature) are February and March (15°C).
Average daylight in December /
Average sunshine in December
Istro, Greece
- Average daylight in December: 9h and 5min
The month with the longest days is June (Average daylight: 14h and 30min).
The month with the shortest days is December (Average daylight: 9h and 48min).
- Average sunshine in December: 6h and 3min
The month with the most sunshine is August (Average sunshine: 12h and 6min).
The month with the least sunshine is January (Average sunshine: 6h and 24min).
Average sunshine days in December
Istro, Greece
- Average sunshine days in December: 16.5 days
The months with the most sunshine days are July and August (30.3 days).
The month with the least sunshine days is January (15.9 days).
Average UV index in December
Istro, Greece
- Average UV index in December: 4
The months with the highest UV index are July and August (UV index 7).
The months with the lowest UV index are January, February, March and December (UV index 4).
Average cloud cover in December
Istro, Greece
- Average cloud cover in December: 29
The month with the most cloud cover is January (Cloud cover 31).
The months with the least cloud cover are July and August (Cloud cover 2).
Average visibility in December
Istro, 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).
Istro, Greece
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