Cool
Average highs are around 3°C, so pack for cooler days.
December verdict
Nagano, Nagano, Japan in December
Weather score18Poor
Poor for holiday weather
Average highs are around 3°C, so pack for cooler days. Sunshine averages 3.7h per day, so this is not one of the brighter months. Rainfall averages 78mm, which is relatively low for holiday planning.
December weather
Monthly averages
Temp
3°C
Rain
78mm
Sun
3.7h
Sea
16°C
Weather score
18
Poor
Seasonal climate calendar
TemperatureTemp
RainRain
SunSun
SwimSwim
Weather scoreWeather score
Trip feel
Drier
Rainfall averages 78mm, which is relatively low for holiday planning.
Limited sun
Sunshine averages 3.7h per day, so this is not one of the brighter months.
Cool sea
Sea temperatures average 16°C, so the water can feel cool.
Map
Weather map
Compare Nagano, Nagano, Japan with nearby places by weather score, rain, sun, temperature, and swim conditions.
Temperature
December3°C average high
December is on the cooler side of Nagano's year, useful if you prefer less intense daytime heat.
Warmest monthsJune to September
This stretch sets the upper range for average daytime heat.
Rain
December78mm average rain
December is one of Nagano's driest months, making outdoor days easier to plan than in wetter parts of the year.
Driest monthsJanuary to May and October to December
This is the drier part of the year, when outdoor plans usually need less weather flexibility.
Sun
December3.7 hours average sun
December is one of Nagano's cloudier months, so sunshine-led plans are less reliable.
Brightest monthsApril to May
This stretch has the strongest sunshine in the monthly averages.
Sea temperature
December16°C average sea
December is below Nagano's yearly sea-temperature average, so swimming can feel fresher.
Warmest seaJuly to September
Sea temperatures are usually near 24°C in this stretch, so swimming comfort is at its strongest.
Weather score
December18 weather score
December is one of the weakest weather-score months, when the overall mix is less favourable than the rest of the year.
Best weather monthsJuly to September
These months have the strongest weather score in the monthly averages.
