Cool
Average highs are around 5°C, so pack for cooler days.
December verdict
Poor for holiday weather
Average highs are around 5°C, so pack for cooler days. Sunshine averages 2.9h per day, so this is not one of the brighter months. Rainfall averages 92mm, so some wet days are possible.
Monthly averages
Temp
5°C
Rain
92mm
Sun
2.9h
Sea
13°C
Weather score
16
Poor
Cool
Average highs are around 5°C, so pack for cooler days.
Showers
Rainfall averages 92mm, so some wet days are possible.
Limited sun
Sunshine averages 2.9h per day, so this is not one of the brighter months.
Cool sea
Sea temperatures average 13°C, so the water can feel cool.
Map
Compare Yamagata, Japan with nearby places by weather score, rain, sun, temperature, and swim conditions.
December5°C average high
December is on the cooler side of Yamagata's year, useful if you prefer less intense daytime heat.
Warmest monthsJune to September
This stretch sets the upper range for average daytime heat.
December92mm average rain
December sits on the drier side of Yamagata's year, which helps with sightseeing and transfers.
Driest monthsJanuary to May and October to December
This is the drier part of the year, when outdoor plans usually need less weather flexibility.
December2.9 hours average sun
December is one of Yamagata's cloudier months, so sunshine-led plans are less reliable.
Brightest monthsApril to May and August
This stretch has the strongest sunshine in the monthly averages.
December13°C average sea
December is below Yamagata's yearly sea-temperature average, so swimming can feel fresher.
Warmest seaJuly to September
Sea temperatures are usually near 21°C in this stretch, so swimming comfort is at its strongest.
December16 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 August
These months have the strongest weather score in the monthly averages.
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