Is the Image Sensor weatherproof?

No. The Image Sensor is not designed for outdoor use. The Image Sensor is intended to be used indoors.  

For non-pet applications, the operating temperature limitations are 32-110 degrees Fahrenheit or 0-43.3 degrees Celsius. For pet applications, the limitations are 60-110 degrees Fahrenheit or 15.6-43.3 degrees Celsius. The Image Sensor is also UL certified in up to 85% relative humidity.