Winters in Savigny-sur-Orge are chilly, with temperatures often below freezing point, averaging around 4°C in January and February. As spring arrives, temperatures gradually rise, reaching averages of 7-8°C by March and April. Summers are warm to hot, with July and August experiencing average highs around 19°C, although occasional heatwaves can push temperatures into the mid-30s. Autumn brings a return to cooler temperatures, averaging around 6°C in November and December, with mild periods punctuated by colder snaps.