Lights will work throughout the winter months; due to the lack of sunlight and cooler temperatures you may see a decrease in the duration of the time the light will stay lit. If you choose to bring your lights indoors to store during winter months, we recommend storing the battery separately from the light so that the battery terminal does not retain any moisture. Northern Climates Run Times: Summer Months 8-12 Hours Winter Months 4-6 Hours Southern Climates Run Times: Summer Months 8-12 Hours Winter Months 6-8 Hours