http://www.wbuf.noaa.gov/tempfc.htm
click this ^ for a handy converter
Explanation
There are two main temperature scales. The Fahrenheit Scale (used in the US), and the Celsius Scale (part of the Metric System, used in most other Countries)
They both measure the same thing (temperature!), just using different numbers.
If you freeze water, it measures 0° in Celsius, but 32° in Fahrenheit
If you boil water, it measures 100° in Celsius, but 212° in Fahrenheit
The difference between freezing and boiling is 100° in Celsius, but 180° in Fahrenheit.
Freezing ... to ... Boiling