Stephens City is located in the humid subtropical climate zone (Köppen climate classification: "Cfa"), exhibiting four distinct seasons. Its climate is typical of Mid-Atlantic U.S. areas removed from bodies of water. The town is located in plant hardiness zone 7 throughout the town and surrounding Frederick County, indicating a temperate climate. Spring and fall are warm, with low humidity, while winter is cool, with annual snowfall averaging . Average winter lows tend to be around 30 °F (−1 °C) from mid-December to mid-February. Blizzards affect Stephens City on average once every four to six years. The most violent nor'easters typically feature high winds, heavy rains, and occasional snow. These storms often affect large sections of the U.S. East Coast.