Winters in Lower Merion are cold, with temperatures often below freezing and averaging around 0°C in January. Temperatures gradually rise as spring approaches, but March can still see chilly mornings with highs reaching up to 26°C. Spring brings mild conditions, with April and May temperatures warming up significantly, occasionally hitting highs of 30°C and 32°C respectively. Summer months are warm, with July and August averaging around 24°C, while September sees a slight drop in temperature before the onset of autumn. Autumn is cool, with November temperatures averaging around 5°C, although October can still experience mild days with highs reaching up to 27°C.