Spring in Sa-ch'on is mild and pleasant, with temperatures gradually warming up from March's average of 16°C, with highs ranging from 15°C to 18°C. Summer brings sweltering heat, particularly in July and August, where temperatures soar as high as 31°C and 37°C respectively, averaging around 26°C. Autumn is a welcome respite from the summer heat, with September's average temperature of 22°C, but October's chill begins to set in, with temperatures plummeting to -4°C at night. Winter is cold and frosty, with December's average low of -11°C, though daytime temperatures can still reach up to 16°C.