Garland features a humid subtropical climate (Köppen climate classification: *Cfa*), typical of the American South. The weather is characterized by long, hot summers and relatively mild, brief winters.
During the summer months (June through August), average high temperatures frequently exceed 95°F (35°C), often accompanied by high humidity. Winters are generally mild, with average highs in the 50s°F (10-15°C) and lows occasionally dropping below freezing. The city receives about 40 inches of rainfall annually, mostly in the spring and fall. Snowfall is rare, usually amounting to only a trace or a couple of inches per year, though the region is susceptible to occasional winter ice storms.
Garland is located at the southern edge of "Tornado Alley." The city is prone to severe springtime thunderstorms that can bring heavy rain, lightning, large hail, and occasionally tornadoes. Notably, in December 2015, an unseasonal EF4 tornado struck the southern part of Garland, causing significant damage.