Winters in Minamiuonuma are harsh, with temperatures often dropping below freezing and averaging around 0°C in January. By February, temperatures begin to rise slightly, but still hover around 1°C on average. Spring arrives in March, bringing a welcome increase in temperature, with averages rising to 7°C and occasional warmer days reaching up to 23°C. Summer months of June to August are warm, with highs often reaching the mid-30s Celsius, while autumn sees temperatures cool again, averaging around 8°C by November.