See the non operating temperature limits. As long as you let the iPad warm up to room temperature on its own, I think you should be OK. Don't plug it in to recharge until it has warmed up sufficiently - room temperature.
- Operating ambient temperature: 32° to 95° F (0° to 35° C)
- Nonoperating temperature: -4° to 113° F (-20° to 45° C)
- Relative humidity: 5% to 95% noncondensing