December Weather in Trieste, Italy

Last updated: March 24, 2025

In December, Trieste, Italy experiences a mild winter climate, characterized by a maximum temperature of around 14°C (58°F) and an average of 6°C (42°F), dipping down to a minimum of -2°C (29°F). This month sees significant precipitation, totaling approximately 166 mm (6.5 in) over about 12 days, making it one of the wetter months. With humidity levels soaring to around 88%, the air can feel quite damp, enhancing the chill. Visitors should be prepared for both rain and cool weather while enjoying the unique charm of this coastal city during the festive season.

December Temperature in Trieste

In December, Trieste ushers in the winter season with temperatures that reflect the shift towards colder days. The month starts with a minimum temperature of -2°C (29°F), providing a stark contrast to the mild conditions of the preceding months. As the average temperature settles around 6°C (42°F), residents and visitors can expect brisk yet manageable weather for exploring the city's enchanting winter scenery. The highs reach about 14°C (58°F), allowing for delightful afternoons, albeit with a chill that reminds everyone of winter's embrace. This month marks a transition, as the temperatures noticeably dip from the autumnal warmth, setting the stage for the inviting atmosphere of the holiday season in Trieste.

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

The chart illustrates December temperature patterns in Trieste, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends.
JanFebMarAprMayJunJulAugSepOctNovDec394246536170737466574942
Data source: Temperature data for Trieste generated using information from the Copernicus Climate Change Service.
Choose your preferred temperature unit
The average of daily temperatures (24 hours) calculated across all days in the month.

December Precipitation in Trieste

December in Trieste, Italy, marks the onset of winter with a notable increase in precipitation, receiving an average of 166 mm (6.5 in) of rain over 12 days. This substantial accumulation is reflective of a trend throughout the fall months, building up from 199 mm in November and peaking in September at 183 mm, with each month showcasing a wintery crescendo. As the year wraps up, December stands out as a month where the combination of cooler temperatures and extended rainfall transforms the coastal city, creating a crisp atmosphere. This increase from previous months underscores the region's shift towards a wetter climate, indicating a characteristic end to the year that prepares Trieste for the cold months ahead.

December Precipitation Trends in Trieste

The chart displays monthly precipitation patterns in Trieste, 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.
JanFebMarAprMayJunJulAugSepOctNovDec66128871171751059389183126199166
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Trieste

In Trieste, Italy, December brings a notable return to higher humidity levels, measuring 88%, which echoes the moisture-rich conditions experienced in January and November. This trend highlights a winter pattern where humidity peaks, contrasting sharply with the summer months of July and August, when the air is significantly drier, dipping to 63% and 51% respectively. The gradual descent from early spring, starting at 73% in March and April, to a low of 70% in May and 69% in June indicates a clear seasonal cycle. As the year wraps up, the return to elevated humidity in December not only signifies the cold's arrival but also sets the stage for the wet conditions typical of the area's winter climate.

December Average Humidity in Trieste

This chart illustrates the average monthly humidity levels in Trieste, 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.
JanFebMarAprMayJunJulAugSepOctNovDec88%82%73%73%70%69%63%51%64%83%89%88%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Trieste

In December, Trieste, Italy, experiences a return to lower UV levels, with the UV Index dropping to 2 and categorized as low. This marks a noticeable shift from the intense sun exposure of the summer months, where indices peaked at 9 in June and July. As temperatures cool, the burn time extends to 45 minutes, encouraging residents and visitors to enjoy the outdoors with less concern for sun damage. Overall, December reflects a transition towards gentler sunlight, making it an ideal time to explore the city's winter charm. For more detailed information, you can visit the Trieste UV Index.

Maximum UV Index Levels in Trieste for December

The chart shows the monthly maximum UV Index (UVI) for Trieste 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.
JanFebMarAprMayJunJulAugSepOctNovDec235689987532
Data source: Trieste 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 Trieste

Nestled along the Adriatic coast, Trieste, Italy, enjoys a vibrant tapestry of sunlight throughout the year, with December basking in a modest 207 hours of bright skies. As the year winds down, the city reflects a gradual decline in sunshine hours from the peak of July at 430 hours, creating an atmospheric shift that complements the festive spirit. Notably, the cold winter months witness a dip, with January starting at 182 hours before climbing back up in the spring. This trend reveals a striking contrast: while summer offers almost double the sunlight of December, the city's winter days still offer a welcome glow amidst the chill, reminding visitors and locals alike of the beauty of seasonality in this enchanting port city.

Monthly Sunshine Duration in Trieste: December Highlighted

The December sunshine duration represents the total number of hours Trieste 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.
JanFebMarAprMayJunJulAugSepOctNovDec182h223h315h344h372h417h430h397h326h293h229h207h
Data source: Trieste December Sunshine duration data generated using information from the Copernicus Climate Change Service.

Chance of Sun in Trieste During December

In Trieste, Italy, the likelihood of sunny weather exhibits distinct seasonal trends, with December offering a glimpse of clarity amidst the winter chill. After a dip in November, where the chance of sunshine drops to 36%, December sees a slight improvement to 37%. Although this marks one of the lower probabilities for sunny days throughout the year, it does hint at a potential for occasional brightness. As the year progresses into spring, the sunshine odds rise significantly, peaking in March at 61%. Thus, while December may not be the sunniest month, its mild increase teases the promise of clearer skies just around the corner, inviting hopeful anticipation for the sun-kissed days ahead.

Percentage of Sunny Days in December in Trieste

The chart illustrates the percentage of sunny days in Trieste 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 Trieste experiences clear skies throughout the year.
JanFebMarAprMayJunJulAugSepOctNovDec29%40%61%41%37%53%49%55%56%47%36%37%
Data source: Trieste December chance of sun data, generated using information from the Copernicus Climate Change Service.

Daylight Hours in Trieste in December

In Trieste, Italy, December ushers in the shortest daylight of the year, with only 8 hours of sunlight. As the year progresses, daylight gradually increases from 9 hours in January, peaking at 15 hours in the height of summer during June and July. By the time autumn arrives, the hours taper down again, reflecting the cyclical nature of the seasons. The transition from the vibrant daylight of spring and summer to the darker winter months is pronounced, emphasizing the cozy charm of December. This rhythmic dance of daylight invites both locals and visitors to relish the beauty of winter evenings, as well as look forward to the return of longer days with the approaching spring.

Average Daylight Hours in Trieste for December

The chart illustrates the variation in daylight duration in Trieste throughout the year, with December highlighted. It shows the monthly changes in daylight hours, calculated by summing the hours between sunrise and sunset.
JanFebMarAprMayJunJulAugSepOctNovDec9h 7m10h 22m11h 56m13h 33m14h 55m15h 38m15h 15m14h 2m12h 29m10h 53m9h 28m8h 43m
Data source: Trieste daylight hours, calculated by summing the hours between sunrise and sunset for each day.

December Winds in Trieste

As December rolls into Trieste, Italy, the wind takes a gentle turn, averaging 2.4 m/s (5 mph)—a noticeable drop compared to the briskness of the preceding months. Following a steady increase from October's 3.7 m/s and November's 3.9 m/s, December's calm offers a serene contrast that signals the onset of winter. Throughout the year, wind speeds have fluctuated, peaking in the late autumn months before settling into a quieter rhythm for the holidays. This shift not only enhances the city's picturesque charm but also invites locals and visitors alike to enjoy the tranquil ambiance along the stunning coastline, basking in the crisp, cool air that characterizes the season.

Average December Wind Speed in Trieste

The chart displays monthly wind speed patterns in Trieste, 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.
JanFebMarAprMayJunJulAugSepOctNovDec3.02.82.62.93.02.22.42.82.53.73.92.4 m/s
Data source: Trieste December wind data, generated using information from the Copernicus Climate Change Service.

How December Weather in Trieste Compares to Other Months

The weather in Trieste 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 Trieste and find detailed weather information for every month.

December in Trieste is generally milder than January, with temperatures ranging from a minimum of -2°C (29°F) to a maximum of 14°C (58°F) and an average of 6°C (42°F). The month experiences significant precipitation, totaling 166 mm (6.5 in) over about 12 days, contributing to a humid environment with humidity levels at 88%. In contrast, January brings colder temperatures, with a lower minimum of -8°C (17°F) and a slight decline in the maximum to 12°C (54°F), averaging around 4°C (39°F). Additionally, January sees less rainfall, with only 66 mm (2.6 in) over approximately 7 days, while maintaining the same humidity level of 88%. For more detailed information, you can check Trieste weather in January.

December weather tends to be milder with an average temperature of 6°C (42°F) and maximums reaching up to 14°C (58°F), while February experiences a chillier start with minimum temperatures dropping to -7°C (20°F). Despite both months having comparable average temperatures of 6°C, February can bring a touch of warmth with maximums peaking at 19°C (66°F). Precipitation is slightly lower in February, with 128 mm (5.0 in) over 10 days compared to December's 166 mm (6.5 in) over 12 days. Additionally, February features lower humidity levels at 82%, contrasting with December's humidity of 88%. For more details on the distinctive weather patterns in February, you can visit Trieste weather in February.

December weather is generally milder, featuring an average temperature of 6°C (42°F) with highs reaching up to 14°C (58°F), while the minimum drops to around -2°C (29°F). In contrast, March begins colder, with a minimum temperature of -10°C (14°F) but boasts a higher maximum of 20°C (69°F) and an average of 8°C (46°F). Precipitation is also less in March, totaling 87 mm (3.4 in) over approximately 10 days compared to December's 166 mm (6.5 in) over 12 days. Additionally, March experiences lower humidity at 73% compared to December's 88%. For more detailed insights, check out Trieste weather in March.

In December, temperatures in Trieste range from a chilly -2°C (29°F) to a mild 14°C (58°F), with an average of 6°C (42°F). The month sees considerable precipitation, totaling 166 mm (6.5 in) over about 12 days, accompanied by high humidity levels at 88%. In contrast, April offers a more temperate climate, with temperatures ranging from -1°C (30°F) to a comfortable 24°C (75°F) and an average of 12°C (54°F). Precipitation in April is lower at 117 mm (4.6 in) over just 10 days, and humidity drops to a more pleasant 73%. This transition from December’s cold and dampness to April's warmer and drier conditions makes for a noticeable seasonal shift. For more details about April weather in Trieste, you can visit Trieste weather in April.

When comparing December and May weather, notable differences emerge. December experiences lower temperatures, with averages around 6°C (42°F) and a maximum of 14°C (58°F), while May enjoys warmer conditions, featuring an average of 16°C (61°F) and peaks reaching 26°C (79°F). Precipitation is fairly high in both months, with December receiving 166 mm (6.5 in) over about 12 days, and May slightly wetter at 175 mm (6.9 in) across 19 days. Additionally, December's humidity stands at a high 88%, compared to May's more comfortable 70%. For more detailed weather insights, check out Trieste weather in May.

In December, the weather is much colder, with temperatures ranging from a low of -2°C (29°F) to a high of 14°C (58°F) and an average temperature of 6°C (42°F). This month also sees significant precipitation, totaling 166 mm (6.5 in) over about 12 days, combined with high humidity levels of 88%.

In contrast, June brings a dramatic shift with milder temperatures, featuring a minimum of 11°C (52°F), an average of 21°C (71°F), and a maximum of 33°C (91°F). Precipitation decreases to 105 mm (4.1 in) across 9 days, and humidity drops to 69%, resulting in a much more pleasant atmosphere. For more detailed insights, check Trieste weather in June.

December and July present stark contrasts in weather. In December, temperatures range from a chilly -2°C (29°F) at night to a milder 14°C (58°F) during the day, with an average temperature of 6°C (42°F). This month also experiences significant precipitation, totaling 166 mm (6.5 in) over 12 days and a high humidity of 88%. In contrast, July boasts much warmer conditions, with minimum temperatures of 15°C (59°F) and a maximum of 32°C (91°F), averaging 23°C (73°F). Precipitation in July is lower, at 93 mm (3.6 in) over 13 days, and the humidity drops to a more comfortable 63%. For more detailed information, you can explore Trieste weather in July.

December and August present stark contrasts in weather. December features much colder temperatures, with a range from a minimum of -2°C (29°F) to a maximum of 14°C (58°F), alongside significant precipitation of 166 mm (6.5 in) over about 12 days, resulting in high humidity levels at 88%. In contrast, August boasts warmer conditions, with temperatures ranging from a minimum of 13°C (56°F) to a maximum of 34°C (93°F) and considerably less precipitation, measuring 89 mm (3.5 in) over 10 days, accompanied by a much drier humidity level of 51%. For a more detailed look at August weather, check out Trieste weather in August.

In December, the weather takes a notable turn compared to September, with minimum temperatures dropping to -2°C (29°F) and average highs around 6°C (42°F), reflecting a much colder climate. In contrast, September showcases milder conditions, with temperatures ranging from a minimum of 8°C (46°F) to a warm average of 19°C (66°F) and maximums soaring up to 30°C (87°F). While both months experience precipitation on about 12 days, December's total rainfall of 166 mm (6.5 in) contrasts slightly with September's 183 mm (7.2 in), indicating that the latter often feels wetter despite being warmer. Additionally, humidity levels in December peak at 88%, while September remains more comfortable at 64%. For more detailed insights on September weather, you can visit Trieste weather in September.

December weather is notably colder than October, with average temperatures ranging from a minimum of -2°C (29°F) to a maximum of 14°C (58°F), compared to October's milder range of 6°C (43°F) to 22°C (72°F). Additionally, December experiences more precipitation, averaging 166 mm (6.5 in) over 12 days, while October sees 126 mm (5.0 in) over 10 days. Humidity levels also increase in December, reaching 88% compared to October's 83%. For a closer look at October's climate specifics, visit Trieste weather in October.

When comparing the weather between December and November, December tends to be slightly colder, with average temperatures ranging from a minimum of -2°C (29°F) to a maximum of 14°C (58°F). In contrast, November experiences milder conditions, with temperatures from a minimum of 0°C (33°F) to a maximum of 18°C (65°F). Precipitation levels are also noteworthy, as December sees 166 mm (6.5 in) of rain over 12 days, while November has a higher total of 199 mm (7.8 in) across 13 days. Humidity remains consistent in both months, with December at 88% and November at 89%. For more detailed information, you can visit Trieste weather in November.

Compare Trieste's Climate with Cities Worldwide

Conclusion: What to Expect From December Weather in Trieste

As December sets in, Trieste transforms under a cloak of cool, damp weather, presenting a stark contrast to the mild autumn months. With average temperatures dipping to a brisk 6°C and nighttime lows sometimes plummeting to -2°C, it’s clear that winter is making its presence felt. The city experiences significant rainfall during this month, with about 166 mm spread over 12 days, contributing to a humidity level that hovers around 88%. This blend of chill and moisture creates a unique atmosphere, marked by a refreshing briskness and a cozy ambiance that invites visitors and locals alike to enjoy warm drinks and festive decorations. For a deeper dive into the varying weather patterns throughout the year, check out Trieste Climate.