Nagano Prefecture Free Weather Report 2025

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🇯🇵 Nagano Prefecture Weather Report – Month-by-Month Overview

🌨️ January
Cold and snowy. Nagano City averages −4 to 4°C. Heavy snowfall blankets mountainous areas like Hakuba and Nozawa Onsen, making it prime ski season. Skies are often overcast, with crisp air and limited sunshine.

🌨️ February
Still wintry. Highs reach 3–7°C, with lows below freezing. Snow continues in the Alps and ski resorts. Sunshine increases slightly, but mornings remain frosty and dry.

🌧️ March
Spring begins. Temperatures rise to 6–13°C. Snow melts in lower regions, replaced by rain. Early blossoms appear in valleys, while higher elevations stay snowy.

🌸 April
Mild and blooming. Highs reach 12–19°C. Cherry blossoms peak in cities like Matsumoto and Ueda. Rain showers alternate with sunny spells. Mountain snow begins to recede.

🌼 May
Warm and pleasant. Temperatures climb to 16–24°C. Rainfall is light, and skies are mostly clear. Ideal for hiking in the Japanese Alps and exploring rural landscapes.

☀️ June
Start of the rainy season. Highs range from 20–27°C. Humidity rises, and afternoon showers are frequent. Rivers swell, and greenery flourishes across the region.

🔥 July
Hot and humid. Temperatures reach 24–31°C. Rainfall peaks early, then tapers off. Summer festivals begin, and mountain escapes offer cooler air.

🏖️ August
Still hot. Highs remain between 25–32°C. Rain is infrequent, and sunshine dominates. Popular time for alpine trekking and lakeside retreats.

🍂 September
Transition to autumn. Temperatures ease to 20–28°C. Rain returns gradually, and typhoon remnants may affect the region. Nights begin to cool, and foliage starts to shift.

🌦️ October
Cooler and clearer. Highs drop to 14–22°C. Rainfall decreases, and autumn colors peak in forests and mountain passes. Crisp air makes it ideal for travel.

🌫️ November
Chilly and dry. Highs hover around 8–16°C, with lows near 3°C. Rain is minimal, and foggy mornings are common. Early snow may appear in higher elevations.

🎄 December
Winter returns. Temperatures range from −2 to 8°C. Snowfall resumes, especially in ski areas. Skies are often clear, and festive lights brighten towns and resorts.

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Weather in Nagano, Japan: A Month-by-Month AnalysisNagano, Japan, nestled in the heart of the Japanese Alps in the Chubu region, is renowned for its stunning natural beauty, cultural heritage, and diverse climate. The city experiences a humid continental climate (Köppen classification Dfb), characterized by cold, snowy winters and warm, humid summers. This report provides a detailed month-by-month analysis of Nagano’s weather, including temperature, precipitation, snowfall, humidity, and daylight hours, to guide travelers, residents, and enthusiasts in understanding the city’s climatic patterns. Data is drawn from reliable sources such as Weather Atlas, Weather Spark, and Climate-Data.org to ensure accuracy.

January: Cold and Snowy BeginningsJanuary is Nagano’s coldest month, with average high temperatures of 3.5°C (38.3°F) and lows dipping to -4.1°C (24.6°F). The city experiences significant snowfall, averaging 980mm (38.58 inches), making it a prime time for winter sports enthusiasts visiting nearby ski resorts like Hakuba and Nozawa Onsen. Precipitation totals around 233mm (9 inches), primarily as snow, with 24.2 rainy or snowy days. Relative humidity peaks at 78%, the highest of the year, contributing to a damp, chilly atmosphere. Sunshine is limited, averaging 4.1 hours per day, making January the month with the least daylight. This period is ideal for those who enjoy snow-covered landscapes but less favorable for general sightseeing due to the harsh conditions.

February: Persistent Winter ChillFebruary remains cold, with average highs of 3.9°C (39°F) and lows around -3.9°C (25°F). Snowfall decreases slightly to 820mm (32.28 inches), but the city still sees significant snow cover. Precipitation averages 188mm (7 inches) across 15 rainy or snowy days. Humidity stays high at 76%, and sunshine hours increase marginally to 5.2 hours per day. The gradual reduction in snowfall signals the approaching end of winter, but the cold persists, making February another excellent month for winter sports. Outdoor activities are limited, but the crisp air and snowy vistas attract visitors to Nagano’s hot springs.

March: Transition to SpringMarch marks the beginning of spring, with temperatures warming to an average high of 9.5°C (49.1°F) and lows of -0.8°C (30.6°F). Snowfall drops significantly to 270mm (10.63 inches), and precipitation averages 204mm (8 inches) across 15 days, shifting from snow to rain. Humidity decreases to 73%, and daylight hours increase to 12 hours, with 6.6 hours of sunshine. The milder weather and reduced snowfall make March suitable for early spring activities like hiking, though some snow may linger in higher elevations. Cherry blossoms begin to appear late in the month, particularly around Zenkoji Temple.

April: Full Bloom of SpringApril brings a pleasant spring climate, with average highs of 16°C (60.8°F) and lows of 2.6°C (36.7°F). Snowfall is minimal, averaging 30mm (1.18 inches), while rainfall increases to 167mm (6.6 inches) across 12 days, the driest month of the year. Humidity drops to its lowest at 71%, and sunshine hours rise to 8 hours daily. The full bloom of cherry blossoms makes April a picturesque time to visit, ideal for outdoor activities and sightseeing. The comfortable temperatures and vibrant landscapes attract many tourists to Nagano’s cultural sites.

May: Warm and RainyMay sees a significant warming trend, with average highs of 22.5°C (72.5°F) and lows of 8.9°C (48°F). Rainfall increases to 203mm (7 inches) across 12 days, marking the onset of the rainy season. Humidity remains at 71%, and sunshine hours peak at 9.1 hours, the highest of the year. The warm, humid conditions support lush greenery, making May excellent for hiking and exploring Nagano’s natural beauty. The mild weather and extended daylight (14.2 hours) enhance outdoor activities, though occasional rain showers require preparation.

June: Start of SummerJune ushers in summer with average highs of 26°C (78.8°F) and lows of 13.6°C (56.5°F). Rainfall spikes to 299mm (11 inches) across 15 days, and humidity rises to 79%. Daylight hours reach their maximum at 14.6 hours, with 8.2 hours of sunshine. The warm, wet conditions make June ideal for visiting Nagano’s highland areas, though the high humidity can feel muggy. Outdoor festivals and hiking are popular, but travelers should be prepared for frequent showers.

July: Peak Heat and RainfallJuly is Nagano’s hottest and wettest month, with average highs of 29.1°C (84.4°F) and lows of 17.8°C (64°F). Precipitation peaks at 382mm (15 inches) across 18 days, and humidity reaches 83%, the highest of the year. Sunshine hours average 7.9 hours, with 14.4 hours of daylight. The intense heat and humidity make July less comfortable for outdoor activities, but the lush summer scenery and local festivals attract visitors. Indoor attractions and highland retreats offer relief from the heat.

August: Continued Summer WarmthAugust remains warm, with average highs of 30°C (86°F) and lows of 18.5°C (65.3°F). Rainfall decreases slightly to 301mm (11 inches) across 16 days, and humidity stays high at 81%. Sunshine hours are around 8 hours, with 13.5 hours of daylight. August is one of the warmest months, ideal for summer activities like hiking and festivals, though occasional showers persist. The breezy highlands of Nagano provide a cooler escape from the city’s heat.

September: Autumn’s ArrivalSeptember brings the start of autumn, with average highs of 26°C (78.8°F) and lows of 14.8°C (58.6°F). Rainfall remains high at 307mm (12 inches) across 15 days, but temperatures begin to cool, offering comfortable conditions. Humidity is at 83%, and daylight hours decrease to 12.4 hours, with 6.4 hours of sunshine. The vibrant autumn foliage begins to appear, making September a scenic time for hiking and hot spring visits. The cooler weather enhances outdoor exploration.

October: Crisp Autumn DaysOctober sees further cooling, with average highs of 18°C (64.4°F) and lows of 8.3°C (47°F). Rainfall decreases to 240mm (9 inches) across 14 days, and humidity drops to 81%. Daylight hours are 11.2 hours, with 5.6 hours of sunshine. The crisp weather and stunning fall colors make October one of the best months for outdoor activities, including hiking and visiting cultural sites. The comfortable temperatures and reduced rainfall enhance Nagano’s appeal.

November: Pre-Winter ChillNovember brings cooler temperatures, with average highs of 12°C (53.6°F) and lows of 1.9°C (35.4°F). Rainfall drops to 193mm (7 inches) across 14 days, and humidity is at 80%. Daylight hours reduce to 10.2 hours, with 5.3 hours of sunshine. Light snowfall may begin late in the month, signaling winter’s approach. The vibrant autumn foliage peaks early in November, making it a great time for scenic drives and hot spring visits.

December: Winter’s ReturnDecember marks the return of winter, with average highs of 6.8°C (44.2°F) and lows of -0.8°C (30.5°F). Snowfall increases to 450mm (17.72 inches), and precipitation averages 227mm (8 inches) across 17 days. Humidity is at 78%, and daylight hours are the shortest at 9.7 hours, with 4.6 hours of sunshine. The snow-covered landscapes and hot springs make December appealing for winter enthusiasts, though the cold limits general outdoor activities.

Best Times to VisitThe ideal times to visit Nagano are spring (March to May) for cherry blossoms and mild weather, and autumn (September to November) for vibrant foliage and comfortable temperatures. Winter (December to February) is perfect for snow sports, while summer (June to August) suits highland exploration despite the heat and rain.

ConclusionNagano’s climate offers a diverse experience, from snowy winters to warm, wet summers and colorful springs and autumns. Understanding its monthly weather patterns helps visitors plan activities, whether skiing in January, hiking in May, or enjoying autumn foliage in October. With its unique blend of natural beauty and cultural attractions, Nagano is a year-round destination tailored to varied interests.

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