Winters in Pen-y-Bont ar Ogwr are cool and variable, with temperatures often below freezing but occasionally rising into double digits. Spring brings a gradual warming trend, with March and April seeing average highs around 9-10°C. Summer is warm to hot, with July being the warmest month, averaging 20°C, while August and September see a slight cooling trend. Autumn is mild, with October and November temperatures similar to spring, before dropping again in winter.