Here's how to convert 20.5 degrees Celsius to Fahrenheit:

Formula:

* °F = (°C × 9/5) + 32

Calculation:

1. Multiply Celsius by 9/5: 20.5 °C × 9/5 = 36.9

2. Add 32: 36.9 + 32 = 68.9

Answer: 20.5 degrees Celsius is equal to 68.9 degrees Fahrenheit.