Winters in Viry-Chatillon are quite chilly, with temperatures often below freezing, ranging from -7C in February to around 0C in May, and averaging around 4-6C from January to March. As spring arrives, temperatures gradually warm up, reaching averages of 8C in April and 12C in May, with occasional highs of up to 25C and 27C respectively. Summer brings mild warmth, with July and August averaging around 19C, but rarely exceeding 30C. Autumn is similar to spring, with temperatures cooling down from September to November, ranging from averages of 11C in October to -3C in December.