Yamagata's climate is characterized by cold winters with occasional warm days, and mild summers. January is the coldest month, with temperatures often below freezing, but averaging around 0°C, while February sees a slight warming trend, still chilly overall. Spring arrives in March, bringing rising temperatures that can reach up to 25°C, with April marking the transition into warmer conditions, averaging 11°C. Summer months of June and July are warm, with highs often reaching over 30°C, although August's temperatures are similar to July's. Autumn brings a return to milder weather in September and October, before the winter chill sets in again by November and December.