Originally Posted by pitangadiego

Celsius: water freezes at 0, boils at 100
Farenheit: water freezes at 32, boils at 212
So the difference is 180 degF and 100 degC, so every degC = 9/5 degF OR 9 degF = 5 degC. Adjust the degF to 0 by subtracting 32. This gives us:

(Deg C x 9/5) + 32 = Deg F OR (DegF - 32) x 5/9 = DegC

For example, 24F (room temp) = 24 x 9/5 = 43.2, plus 32 = 75.2

A hot day in the Central Valley of California could be 100F. Subtract 32 and you have 68. Multiply by 5/9 = 37.4

So:

0 degC = Freezing = 32 degF
24 degC = Room temp = 75 degF
37/38 degC = a hot day = 100 degF

If you can keep track of 0, 24, and 37 and what they feel like you can get a good idea of what the in between temps are.