December weather forecast
Rijeka, Croatia

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The colorful and hilly seaside scenic city of Rijeka in Croatia
The colorful and hilly seaside scenic city of Rijeka in Croatia

Weather in December

Rijeka concludes the year with December showcasing a potent blend of cold and wet climatic conditions. The city's architecture shimmers under the vivid winter sun, creating an enchanting backdrop. Decreased sunlight hours mark the winter solstice, and the city lights lead the festive spirit. Rainfall is slightly lower than November but still remains relatively high at 156mm (6.14"). Despite the low sea temperature, the unmistakable charm of Rijeka during December makes it a memorable month.

Temperature

December in Rijeka brings a slight decrease in the average high-temperature, shifting from a moderate 13.2°C (55.8°F) in November to a cool 10.1°C (50.2°F). Rijeka's nights in December cool down to an average low-temperature of 4°C (39.2°F).

Humidity

In December, the average relative humidity in Rijeka is 66.4%.

Rainfall

In Rijeka, during December, the rain falls for 11.2 days and regularly aggregates up to 156mm (6.14") of precipitation. Throughout the year, in Rijeka, there are 130.3 rainfall days, and 1552mm (61.1") of precipitation is accumulated.

Snowfall

January through March and December are months with snowfall in Rijeka. December is the first month it typically snows. Throughout December, there are 0.1 snowfall days. In Rijeka, during the entire year, snow falls for 1.4 days.

Sea temperature

In Rijeka, Croatia, in December, the average water temperature is 14.3°C (57.7°F).
Note: Swimming in 14.3°C (57.7°F) poses a severe threat. Even short exposure to 13°C (55.4°F) is chilling, and going below 10°C (50°F) can cause breathing irregularities and intense cold shock, based on one's stamina.

Daylight

December has the shortest days of the year, with an average of 8h and 48min of daylight.
On the first day of December, sunrise is at 07:21 and sunset at 16:21. On the last day of the month, sunrise is at 07:41 and sunset at 16:29 CET.

Sunshine

With an average of 3.2h of sunshine, December has the least sunshine of the year.

UV index

January and December, with an average maximum UV index of 1, are months with the lowest UV index. A UV Index estimate of 2, and below, represents a low threat to health from unprotected exposure to Sun's UV rays for ordinary individuals.
Note: The maximum daily UV index, 1 in December, converts into the following recommendations:
Despite the majority tolerating prolonged sun exposure, those with sensitive skin, infants, and children demand continual protection. The Sun's radiation is especially intense around midday; try to stay in shade during this period. Employ a wide-brim hat for potent defense against up to 50% of UV rays. Be vigilant! The reflective nature of snow can increase the Sun's UV radiation nearly twofold.
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Frequently asked questions

What is the temperature in December in Rijeka?

Rijeka in December has an average high-temperature of 10.1°C (50.2°F) and an average low-temperature of 4°C (39.2°F). The average heat index (a.k.a. 'felt air temperature', 'feels like'), which represents the influence of relative humidity on air temperature, in August is evaluated at 29°C (84.2°F).

What is the average humidity in December in Rijeka?

The average relative humidity in December in Rijeka, Croatia, is 66.4%.

How much does it rain in Rijeka in December?

In Rijeka, Croatia, during December, the rain falls for 11.2 days and regularly aggregates up to 156mm (6.14") of precipitation.

When does it start snowing in Rijeka?

December is the first month it typically snows in Rijeka. Throughout December, there are 0.1 snowfall days.

What is the water temperature in December in Rijeka?

In Rijeka, the average seawater temperature in December is 14.3°C (57.7°F). Swimming in 14.3°C (57.7°F) is considered life-threatening. Even a few minutes in 13°C (55.4°F) water is uncomfortable, and swimming below 10°C (50°F) may cause total loss of breathing control and cold shock, depending on a person's physique.

What is the month with the shortest days in Rijeka?

December has the shortest days of the year, with an average of 8h and 48min of daylight.

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

In December, the average day length in Rijeka is 8h and 48min.

When are sunrise and sunset in December in Rijeka?

In December, on the first day of the month, sunrise is at 07:21 and sunset at 16:21. On the last day of the month, in Rijeka, sunrise is at 07:41 and sunset at 16:29 CET.

What is the month with the least sunshine in Rijeka?

With an average of 3.2h of sunshine, December has the least sunshine of the year in Rijeka.

How long on average sun shines in December in Rijeka?

The average sunshine duration in December in Rijeka is 3.2h.

When is the lowest UV index in Rijeka?

January and December, with an average maximum UV index of 1, are months with the lowest UV index in Rijeka, Croatia.

What is the UV index reading in December in Rijeka?

In December, the average daily maximum UV index in Rijeka is 1. A UV Index reading of 2, and below, represents a low health threat from unsafe exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall days
Average daylight
Average sunshine
Average UV index

Average temperature in December
Rijeka, Croatia

Average temperature in December - Rijeka, Croatia
  • Average high temperature in December: 10.1°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 (9.1°C).

  • Average low temperature in December: 4°C

The months with the highest average low temperature are July and August (18.6°C).
The coldest month (with the lowest average low temperature) is January (2.9°C).

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Average humidity in December
Rijeka, Croatia

Average humidity in December - Rijeka, Croatia
  • Average humidity in December: 66.4%

The month with the highest relative humidity is October (67.4%).
The month with the lowest relative humidity is August (56%).

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Average rainfall in December
Rijeka, Croatia

Average rainfall in December - Rijeka, Croatia
  • Average rainfall in December: 155.6mm

The wettest month (with the highest rainfall) is October (203.9mm).
The driest month (with the least rainfall) is July (70.1mm).

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Average rainfall days in December
Rijeka, Croatia

Average rainfall days in December - Rijeka, Croatia
  • Average rainfall days in December: 11.2 days

The month with the highest number of rainy days is April (12.6 days).
The month with the least rainy days is February (8.5 days).

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Average snowfall days in December
Rijeka, Croatia

Average snowfall days in December - Rijeka, Croatia
  • Average snowfall days in December: 0.1 days

The month with the highest number of snowfall days is January (0.8 days).
The months with the least snowfall days are April, May, June, July, August, September, October and November (0 days).

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Average sea temperature in December
Rijeka, Croatia

Average sea temperature in December - Rijeka, 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).

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Average daylight in December /
Average sunshine in December
Rijeka, Croatia

Average daylight in December / Average sunshine in December - Rijeka, Croatia
  • Average daylight in December: 8h and 5min

The month with the longest days is June (Average daylight: 15h and 36min).
The month with the shortest days is December (Average daylight: 8h and 48min).

  • Average sunshine in December: 3h and 1min

The month with the most sunshine is July (Average sunshine: 9h and 36min).
The month with the least sunshine is December (Average sunshine: 3h and 12min).

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Average UV index in December
Rijeka, Croatia

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

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

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Rijeka, Croatia

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