Interested in Language
1) I had to fix my car when the temperature is at -20 Celcious.
2) I had to fix my car in -20 Celcious.
3) I had to fix my car when the temperature was very low.
Are the above sentences correct? Please advice.
Usually spelled Celsius in the US.
You have been given the spelling and grammatical corrections. However, the sentence itself is rather strange. Was it a coincidence that it was -20 degrees outside on the day your car broke down? Did you car break down because it was -20 degrees outside?
Remember - if you don't use correct capitalisation, punctuation and spacing, anything you write will be incorrect.