To perform the calculation \(-5.8\) degrees Celsius - \((-1.6)\) degrees Celsius, you subtract \(-1.6\) from \(-5.8\).
This can be rewritten as:
\[ -5.8 - (-1.6) = -5.8 + 1.6 \]
Now, let's perform the addition:
\[ -5.8 + 1.6 = -4.2 \]
Therefore, the result of the calculation is:
\[ -4.2 \text{ degrees Celsius} \]