You're asking to convert 100.5 degrees Fahrenheit (°F) to degrees Celsius (°C). Here's how to do that:

Formula:

°C = (°F - 32) × 5/9

Calculation:

1. Subtract 32 from the Fahrenheit temperature: 100.5 - 32 = 68.5

2. Multiply the result by 5/9: 68.5 × 5/9 = 38.06

Therefore, 100.5 degrees Fahrenheit is approximately 38.06 degrees Celsius.