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To find the magnitude of the temperature change, we can use the formula:
\[
\text{Temperature Change} = |\text{Final Temperature} - \text{Initial Temperature}|
\]
Given:
- Final Temperature = 7°C
- Initial Temperature = -8°C
Substituting these values into the formula gives:
\[
\text{Temperature Change} = |7°C - (-8°C)| = |7°C + 8°C| = |15°C| = 15°C
\]
Thus, the magnitude of the temperature change is \( \boxed{15} \)°C.