Oshu's winters are cold and snowy, with January temperatures averaging around -3°C. Spring brings mild temperatures, gradually warming up from March's average of 6°C to April's 9°C. Summer months, June to August, see warm to hot temperatures, peaking at July's high of 25°C on average. Autumn is a relatively cool season, with October and November averaging around 13°C and 8°C, respectively.