Last updated: August 21, 2025
In Katsuura, Japan, December brings a cool yet refreshing climate marked by a maximum temperature of 22°C (71°F), an average of 10°C (51°F), and a minimum of 1°C (33°F). As the month unfolds, precipitation becomes a notable feature with an average of 87 mm (3.4 in) spread over 9 rainy days, contributing to the region's lush winter scenery. With a humidity level of 72%, the air carries a crispness that invigorates both residents and visitors alike, making December an enchanting time to explore this coastal town.
In December, Katsuura experiences a notable transition as temperatures begin to drop, with minimums averaging around 1°C (33°F) and averages settling at 10°C (51°F). The city’s chill is tempered, however, by occasional highs reaching up to 22°C (71°F), providing a mild contrast to the cooler nights. This month marks a shift from the autumnal warmth of November, where temperatures commenced with a minimum of 5°C (42°F), to a more pronounced winter feel. The gradual decrease in daytime warmth signifies the onset of winter, setting a serene backdrop for Katsuura's scenic landscapes as the year draws to a close.
In Katsuura, Japan, December sees a notable shift as the daily precipitation begins to taper off compared to the wetter months prior. With 87 mm (3.4 in) of rainfall falling over an average of 9 days, this month experiences a drop from the heavier downpours of October and November. The precipitation levels in December, while still significant, indicate a transition period before the colder winter months. This pattern of decreasing rainfall aligns with the trend seen from the peak in July, emphasizing a gradual decrease that mirrors the onset of winter. Overall, while December remains damp, it paves the way for a drier season ahead, marking a period of lighter showers compared to earlier months.
December in Katsuura, Japan, showcases a moderate humidity level of 72%, marking a subtle decline from the earlier months. As the year progresses, humidity starts at its highest peak in July at 94%, creating a notable contrast as it gradually decreases through the latter half of the year. After June's peak of 88%, the humidity remains relatively stable, hovering around the low to mid-70s during late autumn and early winter. This trend indicates a shift from the sweltering, moist summer months toward cooler, more comfortable winter conditions, making December feel refreshingly crisp, yet still retaining some of that characteristic Japanese humidity.
As December settles in Katsuura, Japan, the UV Index drops to a moderate level of 4, mirroring the figures from the beginning of the year in January and November. This trend indicates a seasonal cooling, allowing for a safer sun exposure time of 30 minutes before burns occur. Notably, the peak months of May through August exhibit an extreme UV Index of 11, reminding residents and visitors alike to be vigilant about sun protection during summer. As the year transitions into winter, the UV levels return to a more manageable range, making December an ideal time for outdoor activities without the heightened sun risk. For more information on the UV Index throughout the year, visit Katsuura UV Index.
UV Risk Categories
As December arrives in Katsuura, Japan, the city experiences a gentle decline in sunshine hours, tallying 217 hours for the month. This figure, while lower than the vibrant peak of 310 hours in August, reflects a seasonal ebb that captures the essence of winter's approach. The trend from January to December illustrates a gradual ascent in daylight, particularly between the earlier months and the lushness of spring and summer, peaking in May. However, from September onward, the sunshine hours recede as the year draws to a close, leading into the refreshing chill of winter. This transition offers a serene backdrop, where the light of December, though diminished, still enriches Katsuura's coastal beauty.
In Katsuura, Japan, December marks a notable shift in the likelihood of sunny weather, with a 64% chance of sun making it one of the sunniest months of the year. This increase is especially striking when compared to the preceding winter months, with January at 51% and February climbing to 62%. As the year winds down, the trend of increasing sunshine continues, suggesting that December can offer a welcome escape from the typical gloom of winter. Interestingly, this uptick stands in contrast to the summer months, such as June and July, which show lower chances of sunny days. Overall, December emerges as a promising month for those seeking brighter skies in Katsuura.
As the year draws to a close, December in Katsuura, Japan, offers a contrast to the longer daylight of previous months, with only 9 hours of sunlight. This decline in daylight hours marks the end of a gradual transition that begins in late spring; after peaking at a vibrant 14 hours in June, daylight begins its gentle retreat. The pattern reveals a cyclical rhythm, with the longest days of summer giving way to shorter days in the fall and winter months. By December, daylight diminishes consistently, reflecting the seasonal shift, while heralding the return of longer days as the new year approaches.
In Katsuura, Japan, the December winds usher in a refreshing change, with an average speed of 4.2 m/s (9 mph). This marks a slight increase compared to the preceding autumn months, where November also boasted a moderate wind speed of 4.0 m/s. The winter months tend to exhibit a trend of generally mild winds, contrasting sharply with the calmer summer season that dips to 2.9 m/s in July. As the year closes, December's winds not only invigorate the atmosphere but also hint at the seasonal transitions, remaining consistent with the breezy characteristics of the fall and subtly preparing the coastal landscape for the winter chill ahead.
Weather in Katsuura varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Katsuura, focusing on differences in temperature, rainfall, humidity, and UV levels.
In December, the weather experiences a broader range of temperatures, with minimums at 1°C (33°F) and maximums reaching 22°C (71°F), resulting in an average of 10°C (51°F). The month also sees higher precipitation levels at 87 mm (3.4 in) over approximately 9 days, coupled with a humidity level of 72%. In contrast, January brings slightly cooler temperatures, with a minimum of 0°C (31°F) and a maximum of 18°C (65°F), leading to a lower average of 7°C (46°F). Precipitation decreases to 65 mm (2.6 in) over just 6 days, and humidity remains relatively stable at 70%. For more detailed January weather information, you can visit Katsuura weather in January.
In December, temperatures range from a chilly minimum of 1°C (33°F) to a comfortable maximum of 22°C (71°F), with an average temperature of 10°C (51°F). The month also experiences significant rainfall, totaling 87 mm (3.4 in) over 9 days, and a humidity level of 72%. In contrast, February tends to be slightly cooler, with temperatures ranging from a minimum of 0°C (33°F) to a maximum of 19°C (66°F) and an average of 8°C (47°F). Precipitation decreases to 57 mm (2.3 in), occurring on the same number of days, 9, but the humidity drops slightly to 69%. For more detailed information on February weather, visit Katsuura weather in February.
In December, the weather tends to be mild with temperatures ranging from a minimum of 1°C (33°F) to a maximum of 22°C (71°F), averaging around 10°C (51°F). The month sees around 87 mm (3.4 in) of precipitation over approximately 9 days, contributing to a humidity level of 72%. In contrast, March experiences slightly warmer temperatures, with a minimum of 2°C (37°F) and a maximum of 21°C (69°F), averaging 11°C (53°F). However, it also brings increased rainfall, totaling 163 mm (6.4 in) over about 14 days, and a slightly lower humidity level of 68%. For a more detailed overview of March weather, check out Katsuura weather in March.
In comparing the weather of December and April, we see notable differences in temperature and precipitation patterns. December typically experiences minimum temperatures around 1°C (33°F) and averages about 10°C (51°F), peaking at 22°C (71°F), while April generally starts with a higher minimum of 4°C (40°F) and an average temperature of 15°C (59°F), reaching a maximum of 23°C (74°F). Additionally, December sees approximately 87 mm (3.4 in) of precipitation over 9 days, whereas April has a slightly higher rainfall of 112 mm (4.4 in) across 10 days, contributing to a humid atmosphere with levels around 73% in both months. For a more detailed view of weather trends in April, you can check Katsuura weather in April.
In December, the weather is cooler with temperatures ranging from a minimum of 1°C (33°F) to a maximum of 22°C (71°F), and an average of 10°C (51°F). The month sees about 87 mm (3.4 in) of precipitation over approximately 9 days, and the humidity level is around 72%. In contrast, May offers a significantly warmer climate, with temperatures ranging from a minimum of 11°C (52°F) to a maximum of 28°C (82°F), averaging 19°C (67°F). However, it also experiences higher precipitation, totaling 135 mm (5.3 in) across around 12 days, and higher humidity at 81%. For more details on the seasonal conditions, you can check Katsuura weather in May.
In December, temperatures range from a chilly 1°C (33°F) at night to a mild 22°C (71°F) during the day, with an average of 10°C (51°F). The month experiences a moderate amount of precipitation, totaling 87 mm (3.4 in) over about 9 days, along with a relative humidity of 72%. In contrast, June offers much warmer weather, with temperatures starting at a minimum of 16°C (61°F) and reaching highs of 29°C (85°F), averaging around 22°C (72°F). However, June is also wetter, with 185 mm (7.3 in) of rainfall spread over 15 days and higher humidity levels at 88%. For more insights on June weather, you can check the details here: Katsuura weather in June.
In December, the weather is significantly cooler, with temperatures ranging from a minimum of 1°C (33°F) to a maximum of 22°C (71°F) and an average of 10°C (51°F). The month sees around 87 mm (3.4 in) of precipitation over approximately 9 days, accompanied by a humidity level of 72%. In contrast, July experiences much warmer conditions, with temperatures ranging from a minimum of 19°C (67°F) to a maximum of 34°C (93°F), averaging 26°C (78°F). This month is also marked by higher precipitation, totaling 207 mm (8.2 in) across about 17 days, and a significantly higher humidity level of 94%. For more detailed information about July weather in Katsuura, you can visit Katsuura weather in July.
December and August present contrasting weather experiences. In December, temperatures range from a chilly 1°C (33°F) at night to a mild 22°C (71°F) during the day, with an average of 10°C (51°F). This month sees about 87 mm (3.4 in) of precipitation over 9 days and humidity levels at 72%. In stark contrast, August boasts much warmer temperatures, with lows of 21°C (70°F) and daytime highs reaching up to a scorching 34°C (94°F), averaging 28°C (82°F). Additionally, August experiences more rainfall, with 121 mm (4.7 in) spread over 15 days and higher humidity at 87%. For further details on August weather, you can check Katsuura weather in August.
In December, the weather is significantly cooler, with average temperatures ranging from a chilly 1°C (33°F) at night to a milder 10°C (51°F) during the day, peaking at 22°C (71°F). This month experiences moderate precipitation, with about 87 mm (3.4 in) falling over 9 days, resulting in a humidity level of 72%. In contrast, September boasts much warmer temperatures, with nighttime lows around 16°C (62°F) and daytime averages reaching up to 24°C (76°F), peaking at a sweltering 33°C (91°F). Additionally, September sees higher precipitation levels of 196 mm (7.7 in) spread over 17 days, accompanied by a humidity level of 83%. For more details on weather specifics, check out Katsuura weather in September.
In comparing the weather between October and December, October tends to be warmer with average temperatures around 20°C (68°F) compared to December’s milder average of 10°C (51°F). The maximum temperatures in October can reach as high as 28°C (83°F), while December peaks at 22°C (71°F). However, October experiences significantly more rainfall, with 274 mm (10.8 in) of precipitation over about 15 days, contrasted with December’s 87 mm (3.4 in) across 9 days. Additionally, October has a slightly higher humidity level at 78% compared to December's 72%. For more detailed information on October weather, you can visit Katsuura weather in October.
December weather shows a noticeable cool down compared to November. The minimum temperature drops to 1°C (33°F) in December, while November maintains a higher minimum of 5°C (42°F). Although the average temperature in December is lower at 10°C (51°F) compared to 15°C (60°F) in November, the maximum temperatures remain relatively similar, with December reaching up to 22°C (71°F) against November's 23°C (74°F). Precipitation levels also decrease in December, totaling 87 mm (3.4 in) over 9 days, compared to November's higher rainfall of 122 mm (4.8 in) over 11 days. Humidity remains fairly consistent, with December at 72% and November slightly higher at 74%. For more detailed insights on November’s weather, visit Katsuura weather in November.
As December unfolds in Katsuura, the weather presents a notable shift from the milder months of autumn. With a cool average temperature and an increased likelihood of rainy days, it's a time when warm layerings become essential. The inclination toward higher humidity adds a chill to the air, making those crisp, wet days feel even more pronounced. While daytime temperatures can occasionally peak invitingly, the brisk evenings serve as a reminder that winter is just around the corner. For a deeper dive into Katsuura’s climate patterns throughout the year, be sure to check out Katsuura Climate.