Aries Auto Services

When outdoor temperatures drop significantly, so does the pressure in your tires. When it’s hot outside, warmer air molecules in the tire move around faster and bump into each other more, raising the tire pressure to a potentially overinflated level. When the temperature drops, the air molecules slow down and stick together, resulting in a drop in air pressure and a potentially underinflated tire.
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​Many tire manufacturers, such as Firestone and Goodyear, estimate that tires lose one psi for every 10 degrees the outside temperature drops. If your car has a Tire Pressure Monitoring System, the warning light will be triggered by at least a 25 percent drop in tire pressure.