Electric-vehicle batteries, like people, operate best in a fairly narrow temperature range — roughly 65 to 75°F. Outside that zone, batteries become less efficient and must work harder, especially when also powering cabin heating or cooling. The result is predictable: extreme heat or cold reduces an EV’s driving range.
AAA recently tested how modern EVs perform in temperature extremes at its Automotive Research Center in Los Angeles. The group found that high temperatures cut range by an average of 8.5%, while cold weather reduced range by an average of 39%. AAA ran a similar series of tests in 2019 with different vehicles; that year the cold-weather range loss was about the same, but hot-temperature loss averaged 17%. AAA notes the vehicle lineups differed, so comparisons aren’t exact, but the newer results suggest improvements in handling heat while winter performance has changed little.
The tests are conducted inside a temperature-controlled room that can be set as low as 20°F or as high as 95°F. A single vehicle is driven onto a chassis dynamometer — essentially a treadmill for cars with two large rollers under the wheels — and is strapped in place. A technician operates the car on the rollers for hours while the climate is held steady. Each run continues until the battery can no longer sustain highway speeds; that gives AAA a measure of usable range at that temperature.
AAA’s findings also show that cold affects internal-combustion and hybrid vehicles, too. In the 20°F test, hybrids averaged about a 23% drop in fuel economy. The EPA estimates gas vehicles can lose roughly 10% to 30% of fuel economy in cold conditions depending on trip type. So winter range loss isn’t unique to EVs, though the effect can be larger for battery-electric cars.
Geography and policy shape EV adoption. Some cold countries have very high EV uptake — Norway, for example, recorded extremely high battery-electric market share — demonstrating that winter range challenges can be managed. In the United States, EV adoption has been stronger in warmer states; concerns about winter performance, along with infrastructure and policy differences, influence buyer decisions.
Practical tips can reduce the impact of temperature on range:
– Choose a vehicle with strong cold- and heat-weather performance; some models handle extremes better than others.
– Plan for reduced range on cold or very hot days, especially if you don’t have a home charger or you’re planning long trips.
– If fast-charging, try to charge after the battery has warmed up; cold batteries charge more slowly.
– Pre-condition the vehicle (heat or cool the cabin and battery) while it is still plugged in so energy comes from the grid instead of the battery.
– When possible, use heated or ventilated seats instead of running full cabin heat or air conditioning — seat climate control draws less energy.
– Keep tires inflated to manufacturer specifications and drive at moderate speeds to maximize efficiency in any weather.
AAA’s tests are part of its independent research into vehicle technology. The controlled dyno testing provides a repeatable way to measure how temperature affects real-world usable range so drivers can better plan and adapt for seasonal conditions.