Winters in Chelsea are cold and variable, with temperatures often dropping below freezing and averaging around -2°C in February. Spring brings a gradual warming trend, with March experiencing mild days and April enjoying warmer temperatures, occasionally reaching up to 25°C. Summer months are relatively warm, with July and August averaging highs of around 21-23°C, although occasional heatwaves can push temperatures into the mid-30s. Autumn is generally cool, with September being the warmest month before a return to cooler temperatures in October and November. Decembers are typically chilly, with temperatures sometimes dipping below -8°C.