December Weather in Hachimantai, Japan

Last updated: August 21, 2025

December in Hachimantai, Japan is characterized by a crisp winter atmosphere, with temperatures ranging from a pleasant maximum of 12°C (55°F) to a chilly minimum of -12°C (10°F). The month sees an average temperature of -1°C (30°F), creating a perfect setting for winter activities. With precipitation amounting to 87 mm (3.4 in) over 15 days, the region experiences a fair share of snow, enhancing its scenic beauty and providing opportunities for seasonal sports. Additionally, the humidity level remains around 80%, contributing to the enchanting winter landscape that attracts visitors and locals alike.

December Temperature in Hachimantai

In Hachimantai, Japan, December ushers in the winter chill, with temperatures typically ranging from a frigid -12°C (10°F) to a modest 12°C (55°F) during the day. The month showcases a notable dip in average temperatures, settling around -1°C (30°F), which is significantly cooler than the preceding months. As the year draws to a close, Hachimantai transitions from the cooler autumn nights in November to the full embrace of winter, highlighting a consistent trend of decreasing temperatures. This shift makes December a picturesque time to experience the snowy landscapes that the region is famed for, inviting winter sports enthusiasts and nature lovers alike to revel in its wintry charm.

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

The chart illustrates December temperature patterns in Hachimantai, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Hachimantai, 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).
JanFebMarAprMayJunJulAugSepOctNovDec242535445662707264534129
Data source: Temperature data for Hachimantai 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 Hachimantai

In Hachimantai, Japan, December welcomes an average precipitation of 87 mm (3.4 in), making it one of the wetter months of the year. As the region transitions into winter, the 15 days of rainfall mark a notable uptick from November's 11 days. This trend of increased precipitation carries through the autumn months, peaking in the warmer summer season with July recording the highest at 155 mm (6.1 in). Comparatively, December's figures suggest a consistent pattern of significant moisture crucial for the region's diverse ecosystems. As the year closes, the balance of rain offers a beautiful juxtaposition to the impending snowy landscapes, setting the stage for Hachimantai’s picturesque winter scenery.

December Precipitation Trends in Hachimantai

The chart displays monthly precipitation patterns in Hachimantai, 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 Hachimantai, December typically receives around {2} mm ({3} inches) of precipitation spread over approximately {4} days.
JanFebMarAprMayJunJulAugSepOctNovDec6284981191001131551451141526688
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Hachimantai

As winter embraces Hachimantai in December, humidity levels stabilize at around 80%, mirroring the moisture of both January and May. This month acts as a transitional phase, moving away from the peak humidity of summer, which reaches a high of 92% in July and August, and gradually descending towards the drier winter months. The notable drop in humidity from 87% in June reinforces the shift to a cooler climate, yet December maintains a consistent humidity level, distinct from the drier spring months. Overall, December’s humidity reflects a balance of seasonal shifts, providing a refreshingly crisp atmosphere to welcome the new year.

December Average Humidity in Hachimantai

This chart illustrates the average monthly humidity levels in Hachimantai, 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 Hachimantai is approximately {2}%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec80%79%77%75%80%87%92%92%86%82%79%80%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Hachimantai

In Hachimantai, Japan, the UV Index experiences significant fluctuations throughout the year. In December, the UV Index drops to a moderate level of 3, similar to January and November, making sun exposure safer with a burn time of 30 minutes. This pattern reflects a trend of decreasing UV levels as winter approaches, contrasting sharply with the peak months of June and August, where the index reaches an extreme 11 and burn time is reduced to just 10 minutes. As the seasons change, residents and visitors should be mindful of these variations to protect their skin. To learn more about the UV Index in Hachimantai, visit Hachimantai UV Index.

Maximum UV Index Levels in Hachimantai for December

The chart shows the monthly maximum UV Index (UVI) for Hachimantai 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 Hachimantai typically reaches {2}, which falls under the {3} exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec346891110119643
Data source: Hachimantai 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 Hachimantai

In December, Hachimantai, Japan, basks in an average of 182 hours of sunshine, marking a gradual decline as the year draws to a close. This trend reflects a typical seasonal shift, with sunlight peaking in the vibrant months of May and April, where daylight reaches 288 and 258 hours respectively. The sunny days begin to wane following October’s 211 hours, leading into the shorter, cooler days of winter. Despite the decrease, December still offers a delightful stretch of brightness, casting a warm glow over the tranquil landscapes, even as the enchanting snow starts to blanket the region. As the community settles in for winter, the lingering sunshine serves as a gentle reminder of the vibrant seasons that preceded it.

Monthly Sunshine Duration in Hachimantai: December Highlighted

The December sunshine duration represents the total number of hours Hachimantai 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.
JanFebMarAprMayJunJulAugSepOctNovDec152h200h250h258h288h272h269h254h241h211h195h182h
Data source: Hachimantai December Sunshine duration data generated using information from the Copernicus Climate Change Service.

Chance of Sun in Hachimantai During December

In Hachimantai, Japan, the likelihood of enjoying sunny weather in December stands at 31%, which is on par with January and slightly below November's 37%. As the year progresses from spring into winter, a noticeable shift occurs: while April boasts the highest sunshine potential at 41%, the summer months witness a sharp decline, particularly in August, where the chance drops to 17%. Interestingly, December's sunshine probability mirrors that of the cold January days, suggesting a consistent yet modest chance of sun during the winter months. As the year wraps up, the weather seems to oscillate, maintaining a somewhat steady chance of bright days amid the colder temperatures.

Percentage of Sunny Days in December in Hachimantai

The chart illustrates the percentage of sunny days in Hachimantai 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 Hachimantai experiences clear skies throughout the year.
JanFebMarAprMayJunJulAugSepOctNovDec31%38%30%41%26%28%26%17%29%34%37%31%
Data source: Hachimantai December chance of sun data, generated using information from the Copernicus Climate Change Service.

Daylight Hours in Hachimantai in December

As the year winds down, December in Hachimantai, Japan ushers in a return to shorter days, mirroring the daylight duration seen in January with only 9 hours of light. This seasonal shift is part of a broader trend that begins in the spring, where daylight gradually increases from 11 hours in March to a peak of 14 hours during the vibrant months of May, June, and July. However, as autumn sets in, daylight dwindles back to 11 hours in October and 9 hours once again by November and December. This cyclical pattern highlights the rhythmic dance of daylight through the seasons, offering a glimpse of nature's ebb and flow in this picturesque region.

Average Daylight Hours in Hachimantai for December

The chart illustrates the variation in daylight duration in Hachimantai throughout the year, with December highlighted. It shows the monthly changes in daylight hours, calculated by summing the hours between sunrise and sunset.
JanFebMarAprMayJunJulAugSepOctNovDec9h 40m10h 40m11h 56m13h 15m14h 22m14h 56m14h 39m13h 40m12h 25m11h 7m9h 58m9h 22m
Data source: Hachimantai daylight hours, calculated by summing the hours between sunrise and sunset for each day.

December Winds in Hachimantai

As December sweeps across Hachimantai, a noticeable shift in the winds marks the onset of winter. With an average wind speed of 3.2 m/s (7 mph), December's breezes regain some vigor compared to the preceding summer months, where gentle gusts dropped to as low as 1.8 m/s (4 mph) in July. This uptick signals a transition, reflecting the gradual return to more robust winds typical of the colder months. Interestingly, while December's winds are brisker than autumn’s 2.7 m/s (6 mph) in November, they mirror the spring’s earlier conditions, once again hinting at the cyclical rhythm of nature that defines the Hachimantai landscape. As winter deepens, the winds may become an invigorating presence, inviting all to embrace the chill of the season.

Average December Wind Speed in Hachimantai

The chart displays monthly wind speed patterns in Hachimantai, 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.
JanFebMarAprMayJunJulAugSepOctNovDec3.13.83.23.12.92.11.82.22.32.32.73.2 m/s
Data source: Hachimantai December wind data, generated using information from the Copernicus Climate Change Service.

How December Weather in Hachimantai Compares to Other Months

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

December and January present a notable contrast in temperature, with December experiencing milder conditions, marked by an average temperature of -1°C (30°F) and a maximum of 12°C (55°F). In contrast, January is significantly colder, with an average temperature of -4°C (24°F) and a minimum dropping as low as -18°C (1°F). While both months share similar humidity levels at 80%, January typically receives less precipitation—62 mm (2.4 in) over 11 days compared to December's 87 mm (3.4 in) over 15 days. For more details on January weather specifically, you can visit Hachimantai weather in January.

In December, temperatures typically range from a minimum of -12°C (10°F) to a maximum of 12°C (55°F), with an average of -1°C (30°F). This month experiences significant precipitation, totaling 87 mm (3.4 in) over about 15 days, and maintains a relatively high humidity level of 80%.

In contrast, February is colder, with temperatures dipping to a minimum of -20°C (-4°F) and peaking at 8°C (46°F), resulting in an average of -4°C (26°F). While February has a similar amount of precipitation at 84 mm (3.3 in) and also sees about 15 rainy days, the humidity remains slightly lower at 79%.

For more specific information about the weather patterns in February, you can visit Hachimantai weather in February.

December and March present contrasting yet chilly weather patterns. In December, temperatures typically range from a minimum of -12°C (10°F) to a maximum of 12°C (55°F), with an average of -1°C (30°F). The month sees around 87 mm (3.4 in) of precipitation over 15 days, coupled with a humidity level of 80%. In comparison, March experiences slightly milder conditions with temperatures ranging from -17°C (1°F) to 17°C (63°F) and an average of 2°C (35°F). Although it has a bit more precipitation at 98 mm (3.9 in) across 14 days, humidity decreases to 77%. For more insights about the weather in March, you can check Hachimantai weather in March.

In December, the weather is considerably colder, with temperatures ranging from a minimum of -12°C (10°F) to a maximum of 12°C (55°F), while the average hovers around -1°C (30°F). The month experiences 87 mm (3.4 in) of precipitation over 15 days, accompanied by a high humidity level of 80%. In contrast, April brings a noticeable warmth, with temperatures ranging from a minimum of -10°C (15°F) to a maximum of 23°C (73°F) and an average of 7°C (44°F). This month sees an increase in precipitation to 119 mm (4.7 in) across 17 days, though the humidity drops slightly to 75%. For more details on the specific weather patterns in April, you can visit Hachimantai weather in April.

December and May present remarkably different weather patterns. In December, temperatures can plunge as low as -12°C (10°F), with an average of -1°C (30°F) and a maximum of 12°C (55°F). The month is characterized by frequent precipitation, occurring on about 15 days, contributing to a total of 87 mm (3.4 in). Humidity remains high at 80%, creating a chilly atmosphere.

In contrast, May ushers in milder temperatures, ranging from a minimum of 2°C (35°F) to an average of 13°C (56°F) and peaking at 29°C (85°F). While it experiences slightly more precipitation at 100 mm (3.9 in), it spans over just 13 rainy days, maintaining the same humidity level of 80%. These differences highlight May’s more temperate climate, making it a stark contrast to the cold and often snowy December. For more detailed weather insights, refer to Hachimantai weather in May.

December and June showcase vastly different weather patterns. In December, temperatures can plummet to a minimum of -12°C (10°F), with an average around -1°C (30°F) and a maximum reaching 12°C (55°F). This month sees significant precipitation, totaling 87 mm (3.4 in) over 15 days, accompanied by 80% humidity, creating a chilly and damp atmosphere. In contrast, June warms up considerably, with temperatures ranging from a minimum of 5°C (42°F) to an average of 17°C (63°F) and peaking at 29°C (84°F). Though it experiences slightly higher precipitation at 113 mm (4.4 in) over 13 days, the humidity also rises to 87%, contributing to a warm and often muggy feel. For more details on the June weather, you can visit Hachimantai weather in June.

When comparing the weather in December and July, a stark contrast emerges. December experiences cold temperatures with a minimum of -12°C (10°F) and an average of -1°C (30°F), while July boasts a much warmer range with minimums around 12°C (55°F) and an average temperature of 21°C (71°F), peaking at 32°C (90°F). Precipitation patterns also differ significantly; December receives 87 mm (3.4 in) of rain over 15 days, whereas July has a wetter climate with 155 mm (6.1 in) of precipitation spread over 18 days. Additionally, humidity levels are considerably higher in July at 92%, compared to December's 80%. For more specific insights into July weather in this region, visit Hachimantai weather in July.

The weather in December and August presents a striking contrast. December features much colder temperatures, with an average of -1°C (30°F) and nighttime lows dipping to -12°C (10°F), while August enjoys a warm average of 22°C (72°F) and can reach highs of 33°C (92°F). In terms of precipitation, August is wetter, with 145 mm (5.7 in) over 16 days compared to December's 87 mm (3.4 in) across 15 days. Additionally, humidity is notably higher in August at 92%, compared to December’s 80%. For more details on the weather in Hachimantai during August, you can check out Hachimantai weather in August.

December weather is characterized by colder temperatures, with a minimum of -12°C (10°F) and an average around -1°C (30°F), while September enjoys much milder conditions, with temperatures ranging from a minimum of 3°C (38°F) to a maximum of 31°C (88°F). Precipitation levels are relatively high in both months, but September sees slightly more at 114 mm (4.5 in) compared to December's 87 mm (3.4 in). Additionally, December has a higher humidity level of 80%, while September sits at 86%, contributing to a different overall feel during these months. For detailed insights, you can check Hachimantai weather in September.

The weather in December is significantly colder than in October, with temperatures ranging from a chilly minimum of -12°C (10°F) to a maximum of 12°C (55°F). In contrast, October boasts much milder conditions, featuring temperatures that span from a minimum of 0°C (33°F) to a warm maximum of 26°C (78°F). While December experiences around 87 mm (3.4 in) of precipitation over 15 days, October is wetter, with 152 mm (6.0 in) of rainfall spread over 11 days. Humidity levels are quite similar in both months, hovering around 80% in December and slightly higher at 82% in October. For more specific details regarding October weather patterns, you can visit Hachimantai weather in October.

In comparing the weather between December and November, we see a notable drop in average temperatures. While November enjoys a milder average of 5°C (41°F), December plummets to an average of -1°C (30°F). Interestingly, both months record the same minimum temperature of -12°C (11°F in November), but December's maximum temperature significantly decreases to 12°C (55°F), compared to November's highs of 18°C (65°F). Additionally, December experiences more precipitation at 87 mm (3.4 in) over 15 days, compared to November's 66 mm (2.6 in) over 11 days. Humidity levels remain fairly consistent, with December at 80% and November at 79%. For more details on November weather, you can check out Hachimantai weather in November.

Compare Hachimantai's Climate with Cities Worldwide

Conclusion: What to Expect From December Weather in Hachimantai

As December ushers in winter, Hachimantai transforms into a frosty wonderland, showcasing a significant departure from the milder months preceding it. With temperatures plummeting to an average of -1°C, residents and visitors experience the chill of the season, contrasting sharply with the milder autumn. Precipitation is more frequent, with about 15 days of rain or snow, resulting in a total of 87 mm for the month, contributing to the region's impressive winter scenery. The humidity remains high at 80%, lending a crispness to the air that invigorates the spirit. For those intrigued by Hachimantai's changing climate, further insights can be found at Hachimantai Climate.