This conversion of Celsius to Fahrenheit, and vice versa, comes from the Associated Press Stylebook and Libel Manual. Hope it helps, as tedious as the conversions are...
To convert from Celsius to Fahrenheit: multiply the Celsius temperature by 9, divide that number by 5, and add 32 to the that number. Or multiply the Celsius number by 1.8, then add 32.
To convert from Fahrenheit to Celsius: Subtract 32 from the Fahrenheit number, multiply that number by 5, then divide that number by 9. Voila.