December Weather in Castro, Chile

Last updated: August 21, 2025

December in Castro, Chile offers a delightful blend of summer warmth and vibrant coastal charm. With temperatures soaring to a maximum of 29°C (84°F) and an average of 14°C (57°F), the climate is pleasantly mild, perfect for exploring the picturesque surroundings. However, visitors should be prepared for some rain, as the month sees 69 mm (2.7 in) of precipitation over 12 days, contributing to the lush landscapes. The humidity remains relatively high at 84%, adding a refreshing feel to the air. Overall, December in Castro presents an inviting atmosphere for both adventurers and those seeking tranquility by the sea.

December Temperature in Castro

In December, temperatures in Castro, Chile begin to warm as summer approaches, presenting a delightful transition from the cooler months. The minimum temperature averages around 4°C (40°F), increasing gradually from the chilly depths of winter. With an average of 14°C (57°F), December offers pleasant daytime weather, perfect for outdoor exploration. As the month progresses, the maximum temperatures can soar to 29°C (84°F), marking one of the warmest periods of the year. This trend reflects a significant shift from the preceding months, emphasizing a move towards a more temperate and inviting climate, ideal for experiencing the vibrant natural beauty and culture of the region.

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

The chart illustrates December temperature patterns in Castro, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Castro, December typically has an average temperature of {2}°C ({3}°F), with highs reaching up to {4}°C ({5}°F) and lows dropping to around {6}°C ({7}°F).
JanFebMarAprMayJunJulAugSepOctNovDec585955524845444547495357
Data source: Temperature data for Castro 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 Castro

In December, Castro, Chile experiences a modest precipitation amount of 69 mm (2.7 in), marking a notable decrease compared to the wetter months preceding it. The rain typically falls over 12 days, offering a brief respite from the more intense rainfall of late spring and early winter. While December is far from the driest month—January records even less precipitation—the trend shows a gradual decline from the peak of 207 mm (8.2 in) in June, illustrating the region's shift towards a drier summer season. This transition hints at a vibrant landscape recharging before the heavier rains return, making December a unique bridge between the lushness of the wet season and the warmth of summer.

December Precipitation Trends in Castro

The chart displays monthly precipitation patterns in Castro, 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 Castro, December typically receives around {2} mm ({3} inches) of precipitation spread over approximately {4} days.
JanFebMarAprMayJunJulAugSepOctNovDec49408312317320716520913513210769
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Castro

In December, humidity levels in Castro, Chile, settle at a comfortable 84%, contributing to the region's lush, vibrant landscape. As the year winds down, the humidity exhibits a slight decline from the higher levels observed in late spring, where figures peaked at 87% in both April and the cooler months of July and August. The gradual tapering from 85% in February to 82% in November suggests a consistent pattern of elevated moisture through the austral summer, creating a welcoming atmosphere for both residents and visitors alike. Overall, December's humidity reflects a harmonious balance, ensuring the captivating beauty of Castro remains ever-present.

December Average Humidity in Castro

This chart illustrates the average monthly humidity levels in Castro, 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 Castro is approximately {2}%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec83%85%82%87%87%86%87%87%86%84%82%84%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Castro

In December, Castro, Chile experiences an extreme UV Index of 13, matching the intensity seen in January and November. This trend highlights a consistent peak in UV exposure during the summer months, where the burn time is a mere 10 minutes. As the year progresses from spring into summer, the UV Index escalates, peaking in these warmer months before tapering off into the cooler seasons. Following December, the UV levels will gradually decrease, welcoming longer safe exposure times. For those planning to soak up the sun, it’s essential to stay informed about these trends to protect your skin effectively. Discover more about the UV Index in Castro here.

Maximum UV Index Levels in Castro for December

The chart shows the monthly maximum UV Index (UVI) for Castro 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 Castro typically reaches {2}, which falls under the {3} exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec1312963224681313
Data source: Castro 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 Castro

As December unfolds in Castro, Chile, residents and visitors alike are greeted by a remarkable surge in sunshine, boasting an impressive 346 hours of radiant light, the highest of the year. This month stands in stark contrast to the preceding cooler months, particularly from June to August, when the hours of sunlight dropped significantly, with June capturing just 141 hours. The gradual increase from the depths of winter to the vibrant summer months is truly captivating; after a mere 189 hours in May, the sun makes a robust comeback in October and November, each exceeding 280 hours. December not only marks the official onset of summer but also the apex of solar abundance, inviting all to revel in the warmth and vitality that accompanies the season's prolonged daylight.

Monthly Sunshine Duration in Castro: December Highlighted

The December sunshine duration represents the total number of hours Castro 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.
JanFebMarAprMayJunJulAugSepOctNovDec284h306h301h216h189h141h175h193h243h281h290h346h
Data source: Castro December Sunshine duration data generated using information from the Copernicus Climate Change Service.

Chance of Sun in Castro During December

As December approaches in Castro, Chile, residents can look forward to a moderate increase in sunny weather, with a 53% chance of sunshine gracing the skies. This represents a noticeable improvement compared to the preceding months, where cloudy days often prevail, especially in the depths of winter. After a series of lackluster months like April (17%) and July (24%), December’s outlook hints at a return to brighter days, echoing the warmth of the summer months ahead. This transition not only brings a welcome respite from the gloom but also piques the interest of both locals and visitors eager to embrace the emerging beauty of the region as it gears up for the vibrant summer season.

Percentage of Sunny Days in December in Castro

The chart illustrates the percentage of sunny days in Castro 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 Castro experiences clear skies throughout the year.
JanFebMarAprMayJunJulAugSepOctNovDec47%65%50%17%28%33%24%25%30%36%31%53%
Data source: Castro December chance of sun data, generated using information from the Copernicus Climate Change Service.

Daylight Hours in Castro in December

In December, Castro, Chile, basks in an inviting 15 hours of daylight, marking the peak of summer's embrace. This month stands out as the longest in terms of daylight, showcasing a gradual increase from 14 hours in November. As the year progresses, daylight duration demonstrates a clear seasonal trend: starting strong at 14 hours in January, it gradually shortens to 9 hours during the colder months from May to July. The transition back to longer days begins in August, culminating in the vibrant and sunlit days of December, offering an ideal backdrop for outdoor adventures and communal gatherings in this picturesque region.

Average Daylight Hours in Castro for December

The chart illustrates the variation in daylight duration in Castro throughout the year, with December highlighted. It shows the monthly changes in daylight hours, calculated by summing the hours between sunrise and sunset.
JanFebMarAprMayJunJulAugSepOctNovDec14h 52m13h 43m12h 18m10h 51m9h 40m9h 4m9h 24m10h 27m11h 49m13h 16m14h 34m15h 14m
Data source: Castro daylight hours, calculated by summing the hours between sunrise and sunset for each day.

December Winds in Castro

In December, the winds in Castro, Chile, pick up slightly, averaging 2.9 m/s (7 mph), aligning with the seasonal trend of increasing gusts as summer approaches. This month’s wind speed is a welcome rise from the calmer breezes of early winter, creating a delightful atmosphere for outdoor enthusiasts. Notably, the wind patterns show a gradual increase from an average of 2.4 m/s in January to 3.3 m/s in August, indicating a gentle transition that peaks during the mid-year months. As December arrives, the winds continue to flow steadily, embodying a dynamic balance of nature's embrace in this picturesque coastal town. This fluctuation not only enhances the scenic beauty but also invigorates activities such as sailing and hiking, making it an ideal time for adventurers.

Average December Wind Speed in Castro

The chart displays monthly wind speed patterns in Castro, 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.
JanFebMarAprMayJunJulAugSepOctNovDec2.42.72.52.63.02.92.93.32.82.92.62.9 m/s
Data source: Castro December wind data, generated using information from the Copernicus Climate Change Service.

How December Weather in Castro Compares to Other Months

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

In December, temperatures range from a minimum of 4°C (40°F) to a maximum of 29°C (84°F), with an average of 14°C (57°F). The month experiences a higher total precipitation of 69 mm (2.7 in) over 12 days, resulting in a humidity level of 84%. In contrast, January sees slightly cooler temperatures, with a minimum of 2°C (37°F) and maintaining the same maximum of 29°C (84°F) and average temperature of 14°C (58°F). Precipitation decreases to 49 mm (1.9 in) across 9 days, and humidity is marginally lower at 83%. For a detailed overview of the weather in January, you can check Castro weather in January.

December and February both offer mild temperatures, but February tends to be warmer overall. In December, temperatures range from a minimum of 4°C (40°F) to a maximum of 29°C (84°F), with an average of 14°C (57°F) and about 69 mm (2.7 in) of rainfall over 12 days. February, on the other hand, sees slightly higher temperatures with minimums still at 4°C (40°F) but maximums rising to 35°C (95°F) and an average of 15°C (60°F). Rainfall is reduced significantly in February to 40 mm (1.6 in) over just 6 days, while humidity remains quite high at 85%. For more detailed insights on February weather in Castro, you can refer to Castro weather in February.

In comparing December and March weather, we see some notable similarities and differences. Both months experience a maximum temperature of 29°C (84°F), providing warmth for outdoor activities. However, December has a slightly higher average temperature of 14°C (57°F) compared to March's 13°C (56°F). Precipitation levels are a bit more pronounced in March, with 82 mm (3.2 in) recorded over 11 days, while December sees 69 mm (2.7 in) over 12 days. Humidity levels are also fairly close, with December at 84% and March at 82%. For more details on visibility and climate in March, you can check out Castro weather in March.

In December, temperatures in Castro fluctuate between a minimum of 4°C (40°F) and a maximum of 29°C (84°F), with an average of 14°C (57°F). The month experiences around 69 mm (2.7 in) of precipitation over 12 days, accompanied by a relatively high humidity level of 84%. In contrast, April brings cooler temperatures, with minimums dipping to -1°C (31°F) and an average of 11°C (52°F), peaking at 22°C (72°F). It also sees increased precipitation at 123 mm (4.8 in) over 15 days and slightly higher humidity at 87%. For more detailed insights into the conditions during this month, visit Castro weather in April.

In December, temperatures in Castro typically range from a minimum of 4°C (40°F) to a maximum of 29°C (84°F), with an average of 14°C (57°F). The month experiences relatively lower precipitation, averaging 69 mm (2.7 in) over 12 days, and maintains a humidity level of 84%. In contrast, May brings cooler temperatures, with a minimum of -2°C (29°F) and a maximum of 18°C (65°F), averaging 9°C (49°F). Additionally, May sees significantly higher precipitation, totaling 173 mm (6.8 in) over 17 days and a slight increase in humidity at 87%. For more detailed information, check out Castro weather in May.

December and June present contrasting weather patterns. In December, temperatures range from a mild 4°C (40°F) at night to a warm 29°C (84°F) during the day, with an average of 14°C (57°F). The month experiences 69 mm (2.7 in) of precipitation over 12 days and a humidity level of 84%. In sharp contrast, June features much cooler temperatures, with a minimum of -3°C (26°F) and a maximum of 15°C (60°F), averaging only 7°C (45°F). Precipitation significantly increases to 207 mm (8.2 in) across 21 days, and humidity remains slightly higher at 86%. Overall, December is characterized by warmer temperatures and less rain, while June is cooler and wetter. For more information on June weather, you can check Castro weather in June.

In December, the weather in Castro is generally milder, with temperatures ranging from a minimum of 4°C (40°F) to a maximum of 29°C (84°F), and an average of 14°C (57°F). The month experiences moderate precipitation with 69 mm (2.7 in) spread over about 12 days, accompanied by a humidity level of 84%. In contrast, July brings much colder conditions, with temperatures dipping as low as -3°C (27°F) and averaging around 7°C (45°F), peaking at just 13°C (56°F). This month is also significantly wetter, receiving 165 mm (6.5 in) of rain over 18 days and slightly higher humidity at 87%. For more details on the July climate, you can visit Castro weather in July.

When comparing the weather in December and August, it's evident that December boasts milder temperatures, ranging from a minimum of 4°C (40°F) to a maximum of 29°C (84°F), with an average of 14°C (57°F). In contrast, August experiences much colder temperatures, with a minimum of -3°C (27°F) and a maximum of only 15°C (59°F), averaging around 7°C (46°F). December also sees less precipitation, totaling 69 mm (2.7 in) over about 12 days, while August is significantly wetter, with 209 mm (8.2 in) across 20 days. Additionally, humidity levels are quite high in both months, although August holds a slightly elevated rate at 87% compared to December’s 84%. For more details about August weather specifically, visit Castro weather in August.

In comparing the weather between December and September, December typically boasts warmer temperatures, with minimums reaching 4°C (40°F) and averages around 14°C (57°F), whereas September experiences cooler conditions, dropping to a minimum of -1°C (30°F) and an average of 8°C (47°F). While December enjoys a maximum temperature of 29°C (84°F), September peaks at only 19°C (66°F). Precipitation levels are notably different as well; September records a higher total of 135 mm (5.3 in) over 16 days, compared to December’s 69 mm (2.7 in) across 12 days. Humidity remains relatively similar in both months, with December at 84% and September slightly higher at 86%. For more detailed insights, check out Castro weather in September.

In comparing the weather patterns of December and October, December presents a milder climate with temperatures ranging from a minimum of 4°C (40°F) to a maximum of 29°C (84°F), and an average of 14°C (57°F). In contrast, October is significantly cooler, with minimum temperatures dropping to -3°C (27°F) and maximums reaching up to 22°C (72°F), resulting in an average temperature of just 9°C (49°F). Additionally, October experiences higher precipitation levels, totaling 132 mm (5.2 in) over 18 days, compared to December's 69 mm (2.7 in) over 12 days. Humidity levels remain constant at 84% for both months. For more detailed insights into October's weather, you can explore Castro weather in October.

In comparing the weather of December and November, we see a general increase in temperatures. December boasts minimum temperatures around 4°C (40°F) and average highs of 29°C (84°F), compared to November's minimum of 2°C (35°F) and maximum of 24°C (76°F). Additionally, while December has slightly lower precipitation at 69 mm (2.7 in) over 12 days, November experiences more rainfall at 107 mm (4.2 in) over 13 days. Humidity levels remain similar, with December at 84% and November at 82%. For a more detailed look at November weather, check out Castro weather in November.

Compare Castro's Climate with Cities Worldwide

Conclusion: What to Expect From December Weather in Castro

As December arrives, Castro transforms, unveiling a mild climate distinctly different from the chillier months preceding it. With temperatures averaging a comfortable 14°C, this month marks the beginning of the warmer season, inviting residents and visitors alike to indulge in outdoor activities. While the humidity lingers at a notable 84%, it’s complemented by an increase in precipitation, with about 69 mm falling over 12 days, bringing a refreshing vibrancy to the landscape. This convergence of warmth and moisture paints a picturesque scene, making December a unique time to experience the beauty of Castro. For more insights into the weather patterns throughout the year, visit Castro Climate.