Mount Vernon experiences a temperate climate with significant seasonal variation. Winters are cool, with temperatures often below freezing and averaging around 5°C in February, the coldest month. Spring brings mild temperatures, gradually warming up to averages of 16°C by June, which marks the beginning of summer. Summers are warm but not hot, with temperatures peaking at around 29°C in July. Autumn is cool again, with temperatures dropping back down to averages of 10°C by October.