Winters in Palaiseau are cold and occasionally frosty, with temperatures ranging from just below freezing to mild highs. The coldest months, January and February, see average temperatures around 4-6°C, while December is only slightly warmer. As spring approaches, temperatures gradually rise, reaching an average of 8°C by April, with occasional warmth reaching up to 25°C. Summer brings more consistent warmth, with July and August averaging a pleasant 19°C, but still experiencing chilly mornings. Autumn sees a return to cooler temperatures, with October's averages dipping back down into the mid-range, around 11°C, before winter sets in once again.