We recommend the following T° range for your eVscope:

• storage: -15°C (5°F) -> +60°C (140°F) (recharge your battery regularly if storage > 2 months) 
• storage and recharge: 10°C (50°F) -> +40°C (104°F)
• observation and recharge: 10°C (50°F)-> +40°C (104°F)
• observation: -10°C (14°F) -> +40°C (104°F)

While using it in a very cold environment, we recommend covering it to provide relative insulation. The main effect of the cold will be a faster draining of the battery.