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December Weather in Isernia, Italy

Last updated: August 23, 2025

In December, the average temperature in Isernia, Italy hovers around 5°C (42°F). Expect a chilly minimum of -6°C (22°F) and a comfortable maximum of 15°C (59°F). Be prepared for approximately 170 mm (6.7 in) of precipitation spread over 13 days, and note that the average humidity is a moist 84%.

December Temperature in Isernia

In December in Isernia, the average temperature is 5°C (42°F). Maximum temperatures can reach 15°C (59°F), while minimums can drop as low as -6°C (22°F). Be prepared for a mix of cool and chilly conditions if you're planning to travel during this time.

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

The chart illustrates December temperature patterns in Isernia, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Isernia, December typically has an average temperature of 5°C (42°F), with highs reaching up to 15°C (59°F) and lows dropping to around -6°C (22°F).
JanFebMarAprMayJunJulAugSepOctNovDec384345515867727364564942
Data source: Temperature data for Isernia 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 Isernia

In Isernia in December, the precipitation amount is 170 mm (6.7 in) over the course of 13 days.

December Precipitation Trends in Isernia

The chart displays monthly precipitation patterns in Isernia, 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 Isernia, December typically receives around 170 mm (6.7 inches) of precipitation spread over approximately 13 days.
JanFebMarAprMayJunJulAugSepOctNovDec901271099210975483881104225170
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Isernia

In Isernia in December, humidity is 84%. With an average temperature of 5°C (42°F), this humidity feels like a thick blanket wrapping around you, making every step feel heavier while traveling.

December Average Humidity in Isernia

This chart illustrates the average monthly humidity levels in Isernia, 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 Isernia is approximately 84%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec84%76%69%70%70%61%57%53%65%75%82%84%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Isernia

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

Maximum UV Index Levels in Isernia for December

The chart shows the monthly maximum UV Index (UVI) for Isernia 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 Isernia typically reaches 2, which falls under the low exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec34689101098642
Data source: Isernia 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 Isernia Compares to Other Months

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

This table compares monthly weather conditions in Isernia, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather4°C (39°F)90 mm (3.5 inches)84%moderate
February Weather6°C (43°F)127 mm (5.0 inches)76%moderate
March Weather7°C (45°F)109 mm (4.3 inches)69%high
April Weather10°C (51°F)92 mm (3.6 inches)70%very high
May Weather14°C (58°F)109 mm (4.3 inches)70%very high
June Weather19°C (67°F)75 mm (3.0 inches)61%very high
July Weather22°C (72°F)48 mm (1.9 inches)57%very high
August Weather23°C (73°F)38 mm (1.5 inches)53%very high
September Weather18°C (65°F)81 mm (3.2 inches)65%very high
October Weather13°C (56°F)104 mm (4.1 inches)75%high
November Weather10°C (50°F)225 mm (8.8 inches)81%moderate
December Weather5°C (42°F)170 mm (6.7 inches)84%low

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