Winters in Grand Junction are cold, with temperatures ranging from -15C to 15C, averaging around -1C. As spring approaches, temperatures gradually warm up, reaching averages of 7C by March and 12C by April. Summer months bring moderate temperatures, peaking at an average high of 27C in July and August, but dipping slightly to 24C in August. Autumn brings a return to cooler temperatures, averaging around 11C by October before dropping again into winter.