To find the initial temperature in degrees Celsius, we need to evaluate the equation \( T(x) = 2x + 10 \) when \( x = 0 \), since \( x \) represents the number of hours after noon.
Substituting \( x = 0 \) into the equation:
\[ T(0) = 2(0) + 10 = 0 + 10 = 10 \]
Therefore, the initial temperature at noon (when \( x = 0 \)) is 10 degrees Celsius.