We recommend the following T° (Celsius) range for your eVscope:

• storage: -15°C -> +60°C (recharge your battery regularly if storage > 2 months) 
• storage and recharge: 10°C -> +40°C
• observation and recharge: 10°C -> +40°C
• observation: -10°C -> +40°C

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.