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December Weather in Istria, Romania

Last updated: August 27, 2025

In December, the average temperature in Istria, Romania hovers around 6°C (43°F). Expect a chilly minimum of -5°C (22°F) and occasional highs reaching 16°C (60°F). With an average precipitation of 63 mm (2.5 in) spread over 12 days, staying dry might be a challenge. Additionally, the air carries a notable average humidity of 86%, making it a month to bundle up and stay cozy!

December Temperature in Istria

In December in Istria, the average temperature is 6°C (43°F). The maximum can reach 16°C (60°F), while the minimum can drop as low as -5°C (22°F). It’s advisable to pack layers and be prepared for varying weather conditions while exploring this destination.

December Weather in Istria: Daily Temperature Highs, Lows, and Averages

The chart illustrates December temperature patterns in Istria, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Istria, December typically has an average temperature of 6°C (43°F), with highs reaching up to 16°C (60°F) and lows dropping to around -5°C (22°F).
JanFebMarAprMayJunJulAugSepOctNovDec363943506171757669595042
Data source: Temperature data for Istria generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

December Precipitation in Istria

In Istria in December, the total precipitation amount reaches 63 mm (2.5 in) over the course of 12 days.

December Precipitation Trends in Istria

The chart displays monthly precipitation patterns in Istria, with values for each month alongside December’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how December’s conditions compare to those of other months. In Istria, December typically receives around 63 mm (2.5 inches) of precipitation spread over approximately 12 days.
JanFebMarAprMayJunJulAugSepOctNovDec464242303573471422474863
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Istria

In Istria in December humidity is 86%. With an average temperature of 6°C (43°F), this humidity feels like a chilling blanket enveloping you, making outdoor exploration feel damp and uncomfortable.

December Average Humidity in Istria

This chart illustrates the average monthly humidity levels in Istria, with December’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In December, average humidity in Istria is approximately 86%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec87%83%80%76%73%68%65%53%61%77%85%86%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Istria

In Istria in December, the maximum UV index is 2, which corresponds to a low exposure category. With this level of UV radiation, the time to burn is approximately 45 minutes. To learn more about the hourly UV index in Istria, you can visit Hourly UV Index in Istria.

Maximum UV Index Levels in Istria for December

The chart shows the monthly maximum UV Index (UVI) for Istria in December, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In December, the maximum UV index in Istria typically reaches 2, which falls under the low exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec235789987532
Data source: Istria December UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

  •  Extreme (11+): Avoid the sun, stay in shade.
  •  Very High (8-10): Limit sun exposure.
  •  High (6-7): Use SPF 30+ and protective clothing.
  •  Moderate (3-5): Midday shade recommended.
  •  Low (0-2): No protection needed.

How December Weather in Istria Compares to Other Months

Weather in Istria varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Istria, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in Istria, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather2°C (37°F)46 mm (1.8 inches)87%low
February Weather4°C (40°F)42 mm (1.7 inches)83%moderate
March Weather6°C (43°F)42 mm (1.7 inches)80%moderate
April Weather10°C (51°F)30 mm (1.2 inches)76%high
May Weather16°C (61°F)35 mm (1.4 inches)73%very high
June Weather21°C (71°F)73 mm (2.9 inches)68%very high
July Weather24°C (75°F)47 mm (1.9 inches)65%very high
August Weather25°C (76°F)14 mm (0.6 inches)53%very high
September Weather20°C (69°F)22 mm (0.9 inches)61%high
October Weather15°C (59°F)46 mm (1.8 inches)77%moderate
November Weather10°C (50°F)48 mm (1.9 inches)85%moderate
December Weather6°C (43°F)63 mm (2.5 inches)86%low

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