Pamplona's winters are chilly, with temperatures often below freezing in January and December, averaging around 6-8°C. As spring approaches, temperatures gradually rise, reaching averages of 10-12°C by March and April. Summer months are warm to hot, with July and August being the hottest, but also seeing some cooler mornings, especially in June. Autumn brings a return to milder temperatures, with September and October averaging around 15-20°C before dropping again in November and December.