To find the current temperature, you need to add the change in temperature to the temperature from yesterday. The temperature yesterday was 13°C, and it changed by −18.6°.
So the calculation is:
\[ \text{Current Temperature} = \text{Yesterday's Temperature} + \text{Change in Temperature} \]
Substituting the values:
\[ \text{Current Temperature} = 13°C + (-18.6°C) = 13°C - 18.6°C \]
Now, perform the subtraction:
\[ 13 - 18.6 = -5.6 \]
Therefore, the current temperature is \(-5.6°C\).