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To convert Fahrenheit to Celsius, you can use the following formula:
\[C = (F - 32) \times \frac{5}{9}\]
Given that the high temperature is 45 °F, you can substitute 45 for F in the formula:
\[C = (45 - 32) \times \frac{5}{9}\]
Calculate the result:
\[C = 13 \times \frac{5}{9} = \frac{65}{9} \approx 7.2\]
Therefore, the temperature in degrees Celsius would be approximately 7.2 °C. So, you would report to your friend that the temperature will be around 7.2 degrees Celsius.