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December Weather in Costi, Romania

Last updated: August 27, 2025

In December, the average temperature in Costi, Romania hovers around 3°C (38°F). Expect chilly days, with minimums dipping to -9°C (15°F) and maximums reaching a mild 16°C (61°F). You'll also encounter 52 mm (2.1 in) of precipitation across 9 days, contributing to the average humidity of 86% that envelops the area. Be prepared for a mix of cold and wet weather!

December Temperature in Costi

In December in Costi, the average temperature is 3°C (38°F), with maximums reaching 16°C (61°F) and minimums plummeting to as low as -9°C (15°F). It's advisable to pack warm clothing and be prepared for chilly weather while exploring the area.

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

The chart illustrates December temperature patterns in Costi, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Costi, December typically has an average temperature of 3°C (38°F), with highs reaching up to 16°C (61°F) and lows dropping to around -9°C (15°F).
JanFebMarAprMayJunJulAugSepOctNovDec323743536472757667564537
Data source: Temperature data for Costi 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 Costi

In Costi in December, the total precipitation amount is 52 mm (2.1 in) over the course of 9 days.

December Precipitation Trends in Costi

The chart displays monthly precipitation patterns in Costi, 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 Costi, December typically receives around 52 mm (2.1 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec273338414589491926463353
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Costi

In Costi in December humidity is 86%. With an average temperature of 3°C (38°F), this humidity feels like a damp chill that seeps through your layers, making traveling uncomfortable as breath clouds visibly in the crisp air.

December Average Humidity in Costi

This chart illustrates the average monthly humidity levels in Costi, 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 Costi 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 Costi

In Costi 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 Costi, you can visit Hourly UV Index in Costi.

Maximum UV Index Levels in Costi for December

The chart shows the monthly maximum UV Index (UVI) for Costi 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 Costi typically reaches 2, which falls under the low exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec235689987532
Data source: Costi 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 Costi Compares to Other Months

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

This table compares monthly weather conditions in Costi, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather0°C (32°F)27 mm (1.1 inches)87%low
February Weather3°C (37°F)32 mm (1.3 inches)83%moderate
March Weather6°C (43°F)38 mm (1.5 inches)80%moderate
April Weather12°C (53°F)41 mm (1.6 inches)76%high
May Weather18°C (64°F)45 mm (1.8 inches)73%very high
June Weather22°C (72°F)89 mm (3.5 inches)68%very high
July Weather24°C (75°F)49 mm (1.9 inches)65%very high
August Weather25°C (77°F)19 mm (0.8 inches)53%very high
September Weather20°C (67°F)26 mm (1.0 inches)61%high
October Weather13°C (56°F)46 mm (1.8 inches)77%moderate
November Weather7°C (46°F)33 mm (1.3 inches)85%moderate
December Weather3°C (38°F)52 mm (2.1 inches)86%low

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