ClearWatt warns fleet managers of weather impact on EVs

Data from ClearWatt suggests that EV range can be reduced by up to 40% during the winter due to cold temperatures.

20 October 2025 2 min read

As electric vehicle (EV) adoption continues to increase in fleets, many new EV drivers are about to enter their first winter, and ClearWatt is encouraging fleet managers to ensure drivers are ready to cope with the impact of lower temperatures on battery range.

Data from ClearWatt suggests that EV range can be reduced by up to 40% during the winter due to cold temperatures slowing the chemical reactions within the battery, increasing its internal resistance and reducing its efficiency, with vehicle heating systems also draining significant battery power.

Graham Hurdle, managing director at E-Training World, said: “While there are many similarities between EVs and petrol and diesel vehicles, there are specific differences that drivers need to understand.

“New EV drivers must be made aware that the range they are used to during the summer will decline, and therefore journey planning and driving style will become more important.”

ClearWatt said drivers should be encouraged to use the heated steering wheel and heated seats instead of the heater during their journey, as these operate from the 12V battery and reduce the drain on the main power source.

Hurdle added: “EVs can accelerate very rapidly, which can be useful for overtaking, but can also lead to dangerous driving.

“With roads more likely to be wet and icy or snow-covered in winter, avoiding harsh acceleration is even more important.

“Maintaining a steady speed by looking far ahead, anticipating hazards and making slow adjustments helps improve battery range and reduces the likelihood of a collision.