Light rain, mist or snow does not generally pose a concern for AED operation. However, take steps to make sure that the patient is as dry as possible, is sheltered from the rain, is not lying in a pool or puddle of water and his or her chest is completely dry before attaching the pads. Also make sure that you and other rescuers are not in contact with water when operating the AED. Moreover, avoid getting the AED or AED pads wet if possible.