Opatija
Croatia
Long-term weather forecast
Long-term weather forecast

December weather forecast and climate
Opatija, Croatia

December, the first month of the winter, in Opatija, is also a frosty month, with temperature in the range of an average low of -1°C (30.2°F) and an average high of 7°C (44.6°F).

Temperature

In Opatija, Croatia, the average high-temperature slightly decreases, from a cool 11°C (51.8°F) in November, to a frosty 7°C (44.6°F). In Opatija, Croatia, in December, the average low-temperature is -1°C (30.2°F).

Rainfall

In Opatija, in December, it is raining for 14 days, with typically 128mm (5.04") of accumulated precipitation. Throughout the year, there are 170 rainfall days, and 1471mm (57.91") of precipitation is accumulated.

Sea temperature

In Opatija, the average seawater temperature is 14.3°C (57.7°F).
Note: Swimming in 14.3°C (57.7°F) is considered dangerous. Unprotected immersion in temperatures below 10°C (50°F) causes quickly maximum intensity cold shock with hyperventilation.

Daylight

The month with the shortest days is December, with an average of 8.8h of daylight.

Sunshine

The month with the least sunshine is December, with an average of 3h of sunshine.

UV index

January and December, with an average maximum UV index of 1, are months with the lowest UV index in Opatija. A UV Index of 2, and less, symbolizes a low threat to health from the exposure to the Sun's UV radiation for the average person.
Note: The average daily UV index of 1 transform into the following instructions:
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 solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. 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 Opatija?

The average high-temperature, in December, is 7°C (44.6°F), while the average low-temperature is -1°C (30.2°F).

How many days does it rain in December in Opatija?

In Opatija, in December, during 14 rainfall days, 128mm (5.04") of precipitation is typically accumulated.

How cold is the water in December in Opatija?

In December, the average sea temperature in Opatija is 14.3°C (57.7°F). At temperatures below 10°C (50°F), swimming in a suitably protected swimsuit is feasible; otherwise, cold shock and loss of breathing control are imminent. Even a short swim, without thermal protection, at temperatures around 13°C (55.4°F) is not comfortable.

What is the month with the shortest days in Opatija?

The month with the shortest days in Opatija, Croatia, is December, with an average of 8.8h of daylight.

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

In Opatija, Croatia, the average length of the day in December is 8.8h.

What is the month with the least sunshine in Opatija?

December has the least sunshine of the year in Opatija, with an average of 3h of sunshine.

How many hours of sunshine does Opatija have in December?

In Opatija, the average sunshine in December is 3h.

What are the months with the lowest UV index in Opatija?

Months with the lowest UV index are January and December, with an average maximum UV index of 1.

What is the UV index reading in December in Opatija?

The average daily maximum UV index in December in Opatija, Croatia, is 1. A UV Index estimate of 2, and below, represents a minimal health vulnerability from unsafe exposure to the Sun's UV rays.
Average temperature in December - Opatija, Croatia
  • Average high temperature in December: 7°C

Warmest months (with the highest average high temperature) are July and August (25°C).
Months with the lowest average high temperature are January and February (6°C).

  • Average low temperature in December: -1°C

Months with the highest average low temperature are July and August (13°C).
The coldest month (with the lowest average low temperature) is January (-3°C).

Average rainfall in December - Opatija, Croatia
  • Average rainfall in December: 128mm

The wettest month (with the highest rainfall) is November (178mm).
The driest month (with the lowest rainfall) is July (88mm).

Average rainfall days in December - Opatija, Croatia
  • Average rainfall days in December: 14 days

Months with the highest number of rainy days are April, May and June (16 days).
Months with the lowest number of rainy days are February, July, August, September and October (13 days).

Average sea temperature in December - Opatija, Croatia
  • Average sea temperature in December: 14.3°C

The best month for swimming (with the highest average sea temperature) is August (24.9°C).
The coldest month (with the lowest average sea temperature) is February (10.7°C).

Average daylight in December / Average sunshine in December - Opatija, Croatia
  • Average daylight in December: 8.8h

The month with the longest days is June (Average daylight: 15.6h).
The month with shortest days is December (Average daylight: 8.8h).

  • Average sunshine in December: 3h

The month with most sunshine is July (Average sunshine: 9h).
The month with least sunshine is December (Average sunshine: 3h).

Average UV index in December - Opatija, Croatia
  • Average UV index in December: 1

Months with the highest UV index are June and July (UV index 8).
Months with the lowest UV index are January and December (UV index 1).