What climate can the pear grow in?

The Bartlett, Bosc, D'anjou, Kieffer and Shinko Pears prefer climates where the average low temperature is between -30 degrees Fahrenheit and 30 degrees Fahrenheit, while the Shinseiki, Blakes Pride and Potomac varieties prefer slightly warmer conditions and can thrive with averages only as low as -20 degrees Fahrenheit.