In winter, Oullins experiences cold temperatures with frequent frosts and occasional warmer spells. January and February are the coldest months, with average temperatures ranging from 3-8°C, while December is also quite chilly, averaging around 4°C. Spring brings a gradual warming trend, with March and April temperatures rising to an average of 8-10°C, and May reaching up to 13°C. Summer is warm to hot, with June and July averaging 21-20°C, but can sometimes see temperatures soar above 30°C. Autumn sees a return to cooler temperatures, with September and October averaging around 19-12°C, before the cycle begins again in winter.