To convert degrees Fahrenheit (°F) to degrees Celsius (°C), you can use the following formula:
\[ °C = \frac{(°F - 32) \times 5}{9} \]
Plugging in 45°F:
\[ °C = \frac{(45 - 32) \times 5}{9} \] \[ °C = \frac{13 \times 5}{9} \] \[ °C = \frac{65}{9} \approx 7.22 \]
So, 45°F is approximately 7.22°C.