EV batteries perform best in a fairly narrow band — roughly 65–75°F. Outside that range they lose efficiency and may need to use more energy, especially when also powering cabin heating or cooling. The predictable result is reduced driving range in both very hot and very cold weather.
AAA recently ran controlled tests at its Automotive Research Center in Los Angeles to measure how modern EVs behave in temperature extremes. Vehicles tested in high heat averaged an 8.5% range loss, while cold conditions cut average range by about 39%. AAA ran a comparable set of tests in 2019: winter losses were similar, but the average hot-weather loss back then was about 17%. Because the vehicle mixes differed between years, the numbers aren’t a perfect apples-to-apples comparison, but they suggest some improvement in heat-handling for newer models while cold-weather performance hasn’t changed much.
How the tests work: each car is placed on a chassis dynamometer (a treadmill-like device for vehicles) inside a temperature-controlled room that can be set from about 20°F up to 95°F. The vehicle is strapped in and driven on the rollers until the battery can no longer sustain highway speeds. That yields a repeatable measure of usable range at a given temperature.
Cold affects gasoline and hybrid cars too. In AAA’s 20°F trials, hybrids saw roughly a 23% drop in fuel economy. The EPA estimates internal-combustion vehicles can lose about 10%–30% of fuel economy in cold conditions depending on trip type. So winter range loss isn’t unique to EVs, although its magnitude can be larger for battery-electric cars.
Geography and policy shape adoption. Some cold countries — Norway, for example — have very high BEV market share, showing winter-range challenges can be managed. In the U.S., EV uptake has been stronger in warmer states; concerns about winter performance, charging availability, and regional policy differences influence buyer decisions.
Practical steps to reduce temperature-related range loss:
– Pick a model known for good cold- and heat-weather performance; vehicles vary.
– Expect reduced range on very cold or hot days and plan routes/charging accordingly, especially without a home charger.
– If using fast chargers, wait until the battery has warmed from driving; very cold batteries charge more slowly.
– Pre-condition the cabin and battery while plugged in so the energy comes from the grid, not the battery.
– Use heated or ventilated seats when possible instead of full cabin heating/AC; seat climate control uses less energy.
– Keep tires properly inflated and drive at moderate speeds to maximize efficiency in any weather.
AAA’s controlled dyno testing provides a repeatable, independent way to quantify how temperature affects usable range so drivers can plan and adapt for seasonal conditions.