It was 13c yesterday but the temperature changed by -18.6 overnight what is the temperature now

To find the current temperature, we need to subtract 18.6 from 13:

13 - 18.6 = -5.6

Therefore, the current temperature is -5.6 degrees Celsius.

To find the current temperature after a change of -18.6 degrees Celsius from an initial temperature of 13 degrees Celsius, you need to subtract 18.6 from 13.

13 - 18.6 = -5.6

Therefore, the current temperature is -5.6 degrees Celsius.