Last updated: August 21, 2025
In December, Unzen, Japan experiences a diverse spectrum of weather, featuring a maximum temperature reaching 24°C (76°F) while settling to an average of 10°C (49°F)*. Nights can be quite chilly, with temperatures dipping to a minimum of 0°C (33°F). The month sees 89 mm (3.5 in) of precipitation over approximately 7 days, contributing to the region's lush landscape. With an average humidity level of 79%, December's climate can feel quite damp, enhancing the winter atmosphere and making it a unique time to visit this serene locale.
In December, Unzen, Japan, experiences a notable transition in temperatures as winter settles in. The minimum temperature hovers around 0°C (33°F), providing a crisp chill that signals the season's arrival. With an average of 10°C (49°F), days remain cool yet bearable, while the maximum can reach up to 24°C (76°F), a surprisingly mild peak for the month. This marks a shift from the previous months, where temperatures began to drop significantly. As the year closes, one can see a distinct cooling trend from November, which boasts a warmer average of 15°C (59°F), hinting at December's embrace of winter. Visitors can expect a picturesque winter landscape, with a refreshing atmosphere perfect for outdoor adventures.
December in Unzen, Japan, ushers in a shift towards the cooler, wetter end of the year, with an average precipitation of 89 mm (3.5 in) over 7 days. This volume is a subtle decrease from November's 80 mm, highlighting a transitional phase as the region prepares for winter. While December's precipitation is notably lower than the peak summer months, particularly July with its staggering 475 mm, it still contributes to the overall moisture that sustains the vibrant local ecology. As the days become shorter and temperatures drop, the relatively mild rainfall serves as a gentle reminder of the lingering warmth from earlier months, creating a fascinating contrast in the region's climate narrative.
December in Unzen, Japan, sees a humidity level of 79%, a slight drop from the peak of summer months, where values soar to 92% in July and 91% in August. This seasonal transition highlights the region's characteristic high humidity, which intensifies during the warmer months and gradually decreases as winter approaches. From 84% in May, humidity remains elevated through June and July before showing a gentle decline, ending the year at a comfortable yet slightly damp level. The consistent humidity throughout the year, coupled with the milder decrease in December, underscores Unzen's unique climate, balancing warmth and moisture, making it an inviting destination even as the year draws to a close.
In Unzen, Japan, the UV Index experiences a notable shift throughout the year. It starts off with a moderate index of 4 in January, indicating a safe window for sun exposure of 30 minutes before any risk of burning occurs. As spring approaches, the index climbs to 8 in March and peaks at an extreme level of 11 from April to June, where even short sun exposure can lead to burns in just 10 minutes. The trend continues into the summer months, with July and August maintaining the highest index at 12. As autumn sets in, there's a gradual decline; the index drops back to 6 in November, before returning to 4 in December, allowing for safer sun exposure of 30 minutes once again. This seasonal pattern emphasizes the importance of sun protection during the summer while highlighting a reprieve in the colder months. For more insights, check out the Unzen UV Index for detailed monthly data.
UV Risk Categories
December in Unzen, Japan, embraces a gentle decline in sunshine hours, with 216 hours lighting the month. Following the peak summer brightness of 300 hours in August, the trend gradually tapers off, reflective of the winter's embrace. The steady decrease from earlier months—where the sun shines brightest in spring and summer—culminates in December, yet still offers more daylight than the winter depths of January. This seasonal ebb and flow showcases Unzen's captivating climate, combining crisp winter air with ample opportunity to bask in the beauty of the landscape, making it a delightful, albeit quieter, time for exploration and reflection.
In Unzen, Japan, December offers a moderately optimistic chance of sunny weather, with a 45% likelihood of clear skies. This marks a slight uptick from the gloomier summer months, where probabilities dip into the low twenties. Interestingly, as the year winds down, the chance of sunshine rises, showing a favorable trend from November's 50%. The transition into winter is characterized by the return of brighter days, contrasting sharply with the overcast conditions typically experienced in the middle of the year. As the festive season unfolds, residents and visitors alike can look forward to more sun-drenched moments amidst the chill of December!
In Unzen, Japan, the rhythm of daylight duration creates a captivating seasonal tapestry throughout the year. Starting at 10 hours in January, the days gradually lengthen as spring unfolds, peaking at a generous 14 hours of daylight in June and July. After this summer zenith, the sun begins its slow retreat, with daylight once again dwindling to 10 hours by December. This cyclical pattern not only marks the transition from the vibrant blooms of spring and summer to the tranquil stillness of winter but also invites residents and visitors alike to embrace the beauty of each season's light, culminating in a serene winter solstice that mirrors the sun's gentle return in the following months.
As December arrives in Unzen, Japan, the winds begin to pick up slightly, averaging 2.8 m/s (6 mph). This marks a subtle increase from the calmer summer months, where the wind speed dipped to a low of 1.6 m/s (4 mph) in June. The overall trend throughout the year shows a gradual increase in wind speed as the seasons transition from the stillness of summer to the briskness of winter. Notably, the strongest winds are typically experienced in the chillier months, as evidenced by February's peak at 3.1 m/s (7 mph). December, while cooler and crisper, thus starts to embrace a more energetic breeze, heralding the arrival of winter and inviting the anticipation of sweeping landscapes and lively winter activities.
Weather in Unzen varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Unzen, focusing on differences in temperature, rainfall, humidity, and UV levels.
December and January showcase a notable shift in weather conditions. In December, temperatures range from a mild 0°C (33°F) at night to a pleasant maximum of 24°C (76°F), with an average of 10°C (49°F). This month experiences higher precipitation, totaling 89 mm (3.5 in) over about 7 days, coupled with relatively high humidity at 79%. In contrast, January sees cooler temperatures, with nighttime lows dropping to -2°C (29°F) and daytime highs peaking at 19°C (66°F), resulting in an average of 8°C (46°F). Precipitation decreases to 53 mm (2.1 in) over 6 days, and humidity also slightly declines to 75%. For more details on January weather, check out Unzen weather in January.
December and February exhibit notable differences in weather patterns. In December, temperatures are relatively milder with a minimum of 0°C (33°F) and an average of 10°C (49°F), reaching a maximum of 24°C (76°F). During this month, precipitation totals 89 mm (3.5 in) over about 7 days, alongside a higher humidity level of 79%. In contrast, February experiences cooler temperatures, with a minimum of -2°C (29°F) and an average of 8°C (48°F), peaking at 22°C (71°F). February also sees a slight increase in precipitation to 92 mm (3.6 in) over 9 days, but the humidity drops to 71%. For a more in-depth look at February weather, you can check Unzen weather in February.
In December, temperatures typically range from a chilly minimum of 0°C (33°F) to a comfortable maximum of 24°C (76°F), with an average around 10°C (49°F). The month experiences about 89 mm (3.5 in) of precipitation across roughly 7 days, coupled with a humidity level of 79%. In contrast, March sees slightly warmer temperatures, with a minimum of 3°C (37°F) and an average of 12°C (55°F), still reaching up to 24°C (76°F). However, it experiences more precipitation, totaling 145 mm (5.7 in) over about 11 days, and the humidity decreases to 71%. For a detailed forecast, visit Unzen weather in March.
December and April present contrasting weather conditions. In December, temperatures range from a chilly minimum of 0°C (33°F) to a pleasant maximum of 24°C (76°F), with an average of 10°C (49°F). The month experiences about 89 mm (3.5 in) of precipitation over seven days and maintains a relative humidity of 79%. In contrast, April brings warmer conditions, with temperatures starting at a minimum of 5°C (41°F) and peaking at 29°C (84°F), averaging 16°C (62°F). The precipitation increases to 135 mm (5.3 in) over eight days, while the humidity slightly drops to 78%. For more detailed insights, you can check Unzen weather in April.
December and May present contrasting weather patterns. In December, temperatures range from a chilly minimum of 0°C (33°F) to a mild maximum of 24°C (76°F), with an average of 10°C (49°F). The month sees around 89 mm (3.5 in) of precipitation over 7 days, coupled with a humidity level of 79%. In stark contrast, May offers warmer conditions, with temperatures ranging from a minimum of 10°C (50°F) to a maximum of 30°C (86°F) and an average of 21°C (69°F). This month experiences heavier rainfall, totaling 214 mm (8.4 in) over 12 days, and a slightly higher humidity at 84%. For detailed weather insights, you can check Unzen weather in May.
December and June offer contrasting weather experiences. In December, temperatures range from a chilly 0°C (33°F) to a mild 24°C (76°F), with an average of 10°C (49°F). This month sees a total precipitation of 89 mm (3.5 in) spread over 7 days, with humidity averaging around 79%. In stark contrast, June brings much warmer temperatures, with lows of 16°C (60°F) and highs reaching up to 32°C (90°F), averaging at 24°C (75°F). However, this warmth comes with increased rainfall, totaling 262 mm (10.3 in) over 15 days, coupled with higher humidity levels of 86%. For a more detailed look at June weather in this region, visit Unzen weather in June.
December and July present stark contrasts in weather. In December, temperatures range from a minimum of 0°C (33°F) to a maximum of 24°C (76°F), with an average of 10°C (49°F). The month sees about 89 mm (3.5 in) of precipitation over roughly 7 days, coupled with a humidity level of 79%. Conversely, July experiences significantly warmer temperatures, with a minimum of 20°C (68°F) and a maximum soaring to 37°C (99°F), averaging 27°C (82°F). This month is also notably wetter, receiving 475 mm (18.7 in) of rainfall spread across 19 days, while humidity peaks at 92%. For more detailed weather information, check out Unzen weather in July.
December and August present starkly contrasting weather conditions. In December, temperatures range from a chilly minimum of 0°C (33°F) to a mild maximum of 24°C (76°F), with an average of 10°C (49°F). This month sees about 89 mm (3.5 in) of precipitation over 7 days and holds a humidity level of 79%. In contrast, August boasts high temperatures that begin at a warm minimum of 20°C (68°F) and peak at a scorching maximum of 39°C (102°F), with an average temperature of 29°C (85°F). The summer month experiences much greater rainfall, with 303 mm (11.9 in) of rain occurring over 14 days and higher humidity at 91%. For more details about August weather, you can visit Unzen weather in August.
In December, the weather is much cooler, with temperatures ranging from a chilly minimum of 0°C (33°F) to a mild maximum of 24°C (76°F) and an average of 10°C (49°F). Precipitation is more moderate with 89 mm (3.5 in) over about 7 days and humidity sits at 79%. In contrast, September boasts significantly warmer temperatures, with a minimum of 16°C (62°F), an average high of 25°C (78°F), and peaks reaching up to 35°C (94°F). However, this month experiences much heavier rainfall, totaling 228 mm (9.0 in) across 15 days, along with slightly higher humidity at 84%. For a detailed look at September's weather in Unzen, you can check out Unzen weather in September.
In comparing the weather between December and October, October features significantly warmer temperatures, with minimums of 10°C (50°F) and maximums reaching up to 33°C (91°F), yielding an average of 21°C (69°F). In contrast, December's temperatures are cooler, ranging from a minimum of 0°C (33°F) to a maximum of 24°C (76°F) with an average of 10°C (49°F). Additionally, October experiences slightly higher precipitation at 120 mm (4.7 in) over 9 days, compared to December's 89 mm (3.5 in) over just 7 days. Humidity levels are also marginally higher in October at 83%, compared to December's 79%. For more detailed insights, you can check Unzen weather in October.
Comparing the weather in December and November reveals some notable differences. In December, temperatures range from a minimum of 0°C (33°F) to a maximum of 24°C (76°F) with an average of 10°C (49°F), while November's temperatures are slightly warmer, with a minimum of 3°C (38°F), an average of 15°C (59°F), and a maximum of 25°C (78°F). Rainfall is also similar, with December experiencing 89 mm (3.5 in) over 7 days compared to November's 80 mm (3.1 in) across 8 days. Humidity levels are slightly lower in December at 79%, compared to 81% in November, indicating that December may feel a bit drier. For more detailed information on November weather, you can check Unzen weather in November.
As December settles over Unzen, the weather presents a unique character that contrasts with the preceding months. The temperatures drop significantly, bringing a cooler ambiance that averages around 10°C, with occasional peaks reaching up to 24°C on warmer days. This month also ushers in a noticeable increase in humidity, sitting at about 79%, while precipitation makes its presence felt over roughly a week, totaling 89 mm. The chill of December unveils a distinct shift from the milder conditions of autumn, inviting residents and visitors alike to embrace the seasonal change. For a deeper understanding of how these patterns play out throughout the year, check out the detailed information at Unzen Climate.