December Weather in Castel Gandolfo, Italy

Last updated: March 24, 2025

December in Castel Gandolfo, Italy, offers a unique blend of chilly temperatures and picturesque scenery. With a maximum temperature of 18°C (64°F) and an average of 8°C (47°F), the month can vary significantly from day to day. Expect lows dipping to -3°C (28°F), adding a brisk touch to the festive atmosphere. Rain is a frequent visitor, with 170 mm (6.7 in) of precipitation over 13 days, creating a lush backdrop for winter strolls. The air is notably humid, sitting at 84%, contributing to that crisp, refreshing feel of the season. Whether you're exploring the serene landscapes or enjoying local culture, December in Castel Gandolfo is sure to enchant.

December Temperature in Castel Gandolfo

In December, Castel Gandolfo experiences a transitional chill as temperatures dip with a minimum of -3°C (28°F), contrasted by a mild average of 8°C (47°F) and a peak that can reach 18°C (64°F). This period signifies a shift from the milder late autumn months, as seen in November's warmer end, to a more distinctly wintry ambience. The colder mornings are often followed by pleasant afternoons, making it an enticing time for visitors to explore the area's stunning landscapes and rich history, all while enjoying the crisp air of the Italian winter. As December draws to a close, the blend of coolness and occasional sunny spells creates a serene backdrop, perfect for holiday festivities or quiet reflection beside a warming fireplace.

December Weather in Castel Gandolfo: Daily Temperature Highs, Lows, and Averages

The chart illustrates December temperature patterns in Castel Gandolfo, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends.
JanFebMarAprMayJunJulAugSepOctNovDec444850566472777870615547
Data source: Temperature data for Castel Gandolfo 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 Castel Gandolfo

In December, Castel Gandolfo experiences significant precipitation, with 170 mm (6.7 in) of rainfall over approximately 13 days, making it one of the wetter months of the year. This trend aligns with the rainfall peaks seen in November and September, which both recorded over 100 mm, highlighting a tendency for increased precipitation as winter approaches. The elevated precipitation in December contributes to the enchanting atmosphere of the town, as rain nurtures the lush landscapes while residents and visitors alike prepare for the festive season. As the month unfolds, the stark contrast between the milder, drier summer months and the more substantial winter rainfall showcases the dynamic weather patterns that shape life in this charming Italian locale.

December Precipitation Trends in Castel Gandolfo

The chart displays monthly precipitation patterns in Castel Gandolfo, 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.
JanFebMarAprMayJunJulAugSepOctNovDec7392947589473128106106191170
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Castel Gandolfo

In December, Castel Gandolfo, Italy, experiences a notable resurgence in humidity, rising to 84%. This uptick marks a return to levels seen earlier in the year, aligning with January’s high humidity. Following a gradual decline throughout the summer months, where humidity dipped to its lowest at 53% in August, the air becomes distinctly more moist as winter approaches. November's humidity shows a slight increase to 81%, setting the stage for December's peak. This trend highlights a seasonal pattern, where cooler months bring higher humidity levels, contrasting sharply with the warm, dry summer period. As the year winds down, residents and visitors alike can expect a damp chill in the air, reminiscent of the cozy winter atmosphere that fills the charming lakeside town.

December Average Humidity in Castel Gandolfo

This chart illustrates the average monthly humidity levels in Castel Gandolfo, with December's data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, allowing you to see how December's humidity levels compare to other months.
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 Castel Gandolfo

In Castel Gandolfo, Italy, December brings a noticeable shift in the UV Index, dipping to a low rating of 2, which allows for a more leisurely outdoor experience with a recommended burn time of 45 minutes. This decrease follows a summer peak, where the UV Index reached 10 in July, marking a period of very high exposure that necessitated caution, with burn times as brief as 15 minutes. As the year transitions from the warmth of summer to the cooler winter months, the UV levels consistently decline, starting from moderate levels in early winter months like January and February. Notably, while early spring months witness rising indices, December offers a reprieve, encouraging outdoor activities with reduced sun safety concerns. Explore more about the seasonal shifts in the UV Index here: Castel Gandolfo UV Index.

Maximum UV Index Levels in Castel Gandolfo for December

The chart shows the monthly maximum UV Index (UVI) for Castel Gandolfo 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.
JanFebMarAprMayJunJulAugSepOctNovDec34579101098642
Data source: Castel Gandolfo 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.

December Sunshine in Castel Gandolfo

Nestled in the enchanting landscape of Castel Gandolfo, December ushers in a softer glow, with 244 hours of sunshine that signal the calm before winter’s embrace. As the year winds down, the trend shows a gentle decline from the brilliant brightness of summer, which peaks in July with an impressive 430 hours of sun. The months leading to December, particularly April and May, boast an abundance of light that feeds the vibrant scenery, making the transition to winter a breathtaking experience. While December's sunlight may be less abundant, it offers a tranquil charm, complementing the stunning beauty of this Italian jewel, perfect for reflective strolls and cozy gatherings by the fireplace.

Monthly Sunshine Duration in Castel Gandolfo: December Highlighted

The December sunshine duration represents the total number of hours Castel Gandolfo experiences direct sunlight during the month of December, excluding cloudy or obstructed periods. This chart compares the sunshine duration of December with the other months of the year.
JanFebMarAprMayJunJulAugSepOctNovDec202h260h327h355h400h415h430h398h338h314h246h244h
Data source: Castel Gandolfo December Sunshine duration data generated using information from the Copernicus Climate Change Service.

Chance of Sun in Castel Gandolfo During December

In Castel Gandolfo, Italy, the likelihood of sunny weather in December stands at 48%, offering a mix of cloudy and sunny days as the year winds down. While this percentage is an increase from the lower chances in November at 33%, it still falls short of the sunny peaks reached during the summer months. Trends indicate that as we transition from the cold bites of November to the more temperate December, sunshine begins to reappear more frequently, hinting at a gradual reawakening of warmth. As such, those planning to visit during this month can expect a fair chance of enjoying clear skies amidst the winter charm of this picturesque town.

Percentage of Sunny Days in December in Castel Gandolfo

The chart illustrates the percentage of sunny days in Castel Gandolfo throughout the year, with December highlighted. It highlights the variation in sunshine across each month and provides an overview of the typical frequency of sunny days, offering insights into how often Castel Gandolfo experiences clear skies throughout the year.
JanFebMarAprMayJunJulAugSepOctNovDec35%57%58%44%46%59%70%74%53%41%33%48%
Data source: Castel Gandolfo December chance of sun data, generated using information from the Copernicus Climate Change Service.

Daylight Hours in Castel Gandolfo in December

In Castel Gandolfo, Italy, December marks the end of a year where daylight gradually diminishes, mirroring the season's transition into winter. With only 9 hours of daylight, sunlight is at a premium, making those bright moments all the more cherished. Following a trajectory that begins with 10 hours in February and peaks at a sun-drenched 15 hours in June, the trend shifts as the days shorten from summer's glow into autumn's embrace. As December settles in, the fleeting daylight resonates with a sense of coziness, inviting residents and visitors alike to enjoy the festive spirit of the season, even as the sun sets earlier each day.

Average Daylight Hours in Castel Gandolfo for December

The chart illustrates the variation in daylight duration in Castel Gandolfo throughout the year, with December highlighted. It shows the monthly changes in daylight hours, calculated by summing the hours between sunrise and sunset.
JanFebMarAprMayJunJulAugSepOctNovDec9h 31m10h 35m11h 57m13h 21m14h 32m15h 8m14h 49m13h 46m12h 26m11h 2m9h 49m9h 11m
Data source: Castel Gandolfo daylight hours, calculated by summing the hours between sunrise and sunset for each day.

December Winds in Castel Gandolfo

In Castel Gandolfo, Italy, the December wind offers a refreshing embrace, with an average speed of 2.3 m/s (5 mph). This subtle breeze aligns with the trend of gentle winds characteristic of the winter months, slightly lower than the 2.4 m/s (5 mph) seen in both November and July. Throughout the year, wind speeds tend to fluctuate modestly, peaking in spring and summer, and tapering off in the cooler months. Notably, December's wind consistency mirrors that of previous months, maintaining a soothing atmosphere perfect for leisurely strolls around the picturesque town. As the year draws to a close, the crisp December air serves as a gentle reminder of both the changing seasons and the enduring beauty of this serene lakeside locale.

Average December Wind Speed in Castel Gandolfo

The chart displays monthly wind speed patterns in Castel Gandolfo, with values for each month shown alongside December's data, which is highlighted for easy comparison. It illustrates the average wind speed, offering insights into how December's wind conditions compare to the rest of the year.
JanFebMarAprMayJunJulAugSepOctNovDec2.72.32.02.12.41.82.42.21.72.22.42.3 m/s
Data source: Castel Gandolfo December wind data, generated using information from the Copernicus Climate Change Service.

How December Weather in Castel Gandolfo Compares to Other Months

The weather in Castel Gandolfo changes throughout the year, offering a unique experience in each season. Below is a month-by-month comparison of December's weather with other months, highlighting differences in temperature, precipitation, and other key factors. Click on each section to discover seasonal trends in Castel Gandolfo and find detailed weather information for every month.

December and January in Castel Gandolfo present notable differences in weather patterns. December typically enjoys a milder average temperature of 8°C (47°F), with maximums reaching up to 18°C (64°F), but it experiences higher precipitation, totaling 170 mm (6.7 in) over 13 days. In contrast, January sees a slight drop in average temperature to 7°C (44°F), with minimums dipping down to -6°C (21°F), yet it receives significantly less rainfall, recording only 73 mm (2.9 in) over 9 days. Both months maintain a consistent humidity level of 84%, making the air feel quite damp. For more detailed weather insights, visit Castel Gandolfo weather in January.

December and February exhibit distinct weather patterns, with December being milder and wetter compared to February. In December, temperatures range from a minimum of -3°C (28°F) to a maximum of 18°C (64°F), with an average temperature of 8°C (47°F). The month sees significant precipitation, totaling 170 mm (6.7 in) over about 13 days, contributing to a higher humidity level of 84%. In contrast, February experiences colder temperatures, with a minimum of -12°C (11°F) and a maximum of 20°C (68°F), averaging around 9°C (48°F). Precipitation is reduced to 92 mm (3.6 in) across just 9 days, resulting in lower humidity at 76%. For more detailed insights, you can check the Castel Gandolfo weather in February.

December and March present notably different weather patterns, reflecting the transition from winter to spring. In December, temperatures generally range from a chilly minimum of -3°C (28°F) to a comfortable maximum of 18°C (64°F), with an average temperature of 8°C (47°F). The month experiences considerable precipitation, totaling 170 mm (6.7 in) over 13 days, accompanied by high humidity at 84%. In contrast, March ushers in milder conditions with temperatures dropping to a minimum of -11°C (12°F) and peaking at 22°C (72°F), averaging around 10°C (51°F). Rainfall decreases to 94 mm (3.7 in) across 10 days, and humidity lowers to 69%. For a more detailed view of March weather, you can check out Castel Gandolfo weather in March.

December and April present notably contrasting weather conditions. In December, temperatures range from a chilly -3°C (28°F) to a mild 18°C (64°F), with an average of 8°C (47°F). This month is characterized by high humidity at 84% and substantial precipitation, totaling 170 mm (6.7 in) over 13 days, making it quite a wet and damp time of year. In contrast, April experiences a more temperate climate, with temperatures varying from 0°C (33°F) to a warm 27°C (80°F) and an average of 13°C (56°F). The humidity decreases to 70%, and precipitation significantly diminishes to 75 mm (2.9 in) over 11 days, contributing to a more pleasant and dry atmosphere. For further insights into the spring weather, you can refer to Castel Gandolfo weather in April.

December and May present stark contrasts in weather patterns. In December, temperatures can drop as low as -3°C (28°F), with an average of 8°C (47°F) and a maximum of 18°C (64°F). The month is characterized by significant precipitation, totaling 170 mm (6.7 in) over 13 days, and high humidity levels at 84%. In contrast, May offers a milder climate with minimum temperatures around 4°C (40°F) and an average of 18°C (64°F), reaching up to 33°C (92°F) on warmer days. Precipitation decreases to 89 mm (3.5 in) over 12 days, accompanied by lower humidity at 70%. This shift in weather not only influences daily activities but also highlights the transition from winter to spring. For more detailed information, please check Castel Gandolfo weather in May.

December and June present contrasting weather patterns. In December, temperatures range from a chilly minimum of -3°C (28°F) to a milder maximum of 18°C (64°F), with an average temperature of 8°C (47°F). The month is characterized by significant precipitation, totaling 170 mm (6.7 in) over approximately 13 days, and a high humidity level of 84%. In contrast, June enjoys a much warmer climate, with minimum temperatures of 10°C (50°F) and maximums reaching up to 34°C (94°F), averaging around 22°C (72°F). Rainfall is considerably less, at 47 mm (1.9 in) across just 7 days, and with a lower humidity of 61%. For a detailed overview of June weather, you can visit Castel Gandolfo weather in June.

When comparing December and July weather, the differences are striking. December temperatures range from a chilly -3°C (28°F) at night to a mild average of 8°C (47°F), peaking at 18°C (64°F) during the day, accompanied by significant precipitation of 170 mm (6.7 in) spread over 13 days and high humidity at 84%. In contrast, July boasts much warmer temperatures, with a minimum of 16°C (61°F) and an average of 25°C (78°F), reaching a maximum of 36°C (96°F). Moreover, July experiences far less rainfall, with only 31 mm (1.2 in) falling over just 4 days and humidity at a more comfortable 57%. For a closer look at July weather specifics, check this link: Castel Gandolfo weather in July.

December and August present strikingly different weather patterns. In December, temperatures range from a chilly -3°C (28°F) at their lowest to a mild 18°C (64°F) at their peak, with an average of 8°C (47°F). This month also sees significant precipitation of 170 mm (6.7 in) over approximately 13 days, contributing to a high humidity level of 84%. Conversely, August offers a much warmer climate, with minimum temperatures of 15°C (59°F) and maximums reaching a sweltering 37°C (99°F), averaging around 26°C (79°F). Precipitation is minimal, at just 28 mm (1.1 in) over 7 days, and humidity drops to a comfortable 53%. For a more detailed look at the summer conditions, check out Castel Gandolfo weather in August.

In December, temperatures range from a chilly -3°C (28°F) at night to a mild 18°C (64°F) during the day, with an average of about 8°C (47°F). The month is quite wet, with 170 mm (6.7 in) of precipitation spread over 13 days and a high humidity level of 84%. In contrast, September boasts more pleasant temperatures, with nighttime lows of 8°C (47°F) and daytime highs reaching up to 32°C (90°F), giving an average of 21°C (70°F). This month experiences less rainfall, accumulating 106 mm (4.2 in) over 10 days, and the humidity is considerably lower at 65%. For more detailed information on September weather, you can check Castel Gandolfo weather in September.

When comparing the weather in December and October, it's evident that October experiences milder temperatures, with an average of 16°C (62°F) compared to December's average of 8°C (47°F). In October, temperatures range from a minimum of 6°C (44°F) to a maximum of 28°C (83°F), while December sees much cooler conditions, with nighttime lows dipping to -3°C (28°F). October also has less rainfall, with 106 mm (4.2 in) over about 10 days, whereas December receives more precipitation at 170 mm (6.7 in) across 13 days. Humidity levels are higher in December at 84%, compared to October’s 75%. For more details about October weather, you can check Castel Gandolfo weather in October.

In comparing the weather of December to that of November, we see notable differences in temperature and precipitation patterns. December experiences cooler average temperatures, ranging from a minimum of -3°C (28°F) to a maximum of 18°C (64°F), compared to November's milder averages of -1°C (31°F) to 23°C (73°F). Precipitation is slightly lower in December at 170 mm (6.7 in) over 13 days, compared to November's 191 mm (7.5 in) over 16 days. Humidity levels also remain relatively high, with December at 84% and November at 81%. For a more detailed look at November weather conditions, you can refer to the Castel Gandolfo weather in November.

Compare Castel Gandolfo's Climate with Cities Worldwide

Conclusion: What to Expect From December Weather in Castel Gandolfo

December in Castel Gandolfo presents a striking contrast to the warmer months, as the temperatures dip significantly, providing a cooler and more atmospheric setting. With average highs of 18°C and chilly lows reaching -3°C, this month invites cozy gatherings and festive cheer against a backdrop of crisp winter air. The increased precipitation—averaging 170 mm over 13 days—coupled with a humidity level of 84%, adds to the characteristic charm of December, often filling the landscape with a serene mist. Visitors can expect a more subdued yet enchanting experience, making it a unique time to explore the beauty of this enchanting locale. For more insights on the varying weather patterns throughout the year, visit Castel Gandolfo Climate.