Colmenar Viejo, Spain experiences a mild Mediterranean climate with cold winters and warm summers. Winters are chilly, with temperatures often below freezing in January and February, but can rise to pleasant highs around 20°C by December. Spring is a gentle warming period, with March and April averages rising steadily to 9-11°C. Summers are hot and dry, with July and August temperatures frequently reaching above 40°C, while autumn brings mild conditions, with September and October averages dropping back down to around 19-14°C.