what is the operating temperature rang for Arduino Uno and Arduino GSM shield

Hi I am using Arduino Uno and Arduino GSM shield for my weather station. It works fine when it is mounted near heating system but not at outside temperature which varies from 4 to -10 degree Centigrade. Can any one tell me whats the exact operating temperature range?

or any solution to avoid this.

Regards.

Is there any range listed on the Products page for the 2 devices?

NO I didn't find any.