Winters in Caerphilly are typically mild, with temperatures ranging from -4C to 11C in January and -1C to 14C in February, averaging around 6-7C. As the seasons shift into spring, temperatures rise gradually, reaching an average of 9C by March and 10C by April. Summer months bring warmer conditions, with averages peaking at 20C in July, but this is short-lived as temperatures drop to autumnal ranges by September. Autumn brings a return to milder winters, with November temperatures averaging around 10C, before the cycle repeats itself. Overall, Caerphilly's climate is relatively temperate and stable throughout the year.