# Getting colder

Now the temperature has started to drop. The months of October and November have set records for the highest average temperature over a 24-hour period. The coming weekend reports temperatures down to around the freezing point.

Celsius scale, or centigrade scale, is a temperature scale that is based on the freezing point of water at 0°C and the boiling point of water at 100°C. Fahrenheit scale is a temperature scale that is based on the freezing point of water at 32°F and the boiling point of water at 212°F.

## Fahrenheit to Celsius Estimate Formula

Use this formula to get a good estimate of the Celsius temperature when converting from Fahrenheit. In this case means divided by or to use division.

(Fahrenheit temp. [F]-30)/2 = Celsius temp.

In other words, if you’d like to convert a Fahrenheit temperature to an approximate Celsius temperature:

2. Subtract 30 from this figure (e.g., 100 – 30 = 70).
3. Divide your answer by 2 (e.g., 70 / 2 = 35).

## Fahrenheit to Celsius Exact Formula

If you want a more precise calculation, you can use the more exact formula. Using this calculation, we determine that 100 degrees Fahrenheit is equivalent to 37.78 degrees Celsius.

(F – 32) / 1.8 = C

In other words, if you’d like to convert a temperature reading in Fahrenheit to Celsius:

2. Subtract 32 from this figure (e.g., 100 – 32 = 68).
3. Divide your answer by 1.8 (e.g., 68 / 1.8 = 37.78)

## Converting Celsius to Fahrenheit

To convert Celsius to Fahrenheit, simply reverse the equation. In this case * means times, or to use multiplication.

(C * 1.8) + 32 = F

You can use this equation to show that 100 degrees Celsius is equal to 212 degrees Fahrenheit.