Winters in Newton Mearns are typically cool and occasionally cold, with temperatures ranging from -9°C to 10°C. Spring brings a gradual warming trend, with March often being the first month to experience warmer temperatures above freezing. Summer months are generally mild, with July and August being the warmest, though still relatively temperate, with average highs around 16°C. Autumn sees a return to cooler temperatures, with October often experiencing frosty mornings but pleasant afternoons. December's temperatures can drop sharply, but February's mild spells offer a welcome respite from winter's chill.