Winters in Hillsboro are mild, with temperatures rarely dropping below freezing and averaging around 7-5°C. As spring approaches, temperatures gradually warm up, reaching averages of 12°C by April and 15°C by May. Summer months bring the highest temperatures, with June to August averages ranging from 21-22°C, while September sees a slight drop in temperature. Autumn is characterized by cooler days, with averages returning to around 10-5°C by November and December, mirroring winter conditions.