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The temperature changed by 22°F - (-13°F) = 35°F over 7 hours (from 3:00 a.m. to 10:00 a.m.).
To find the average change per hour, we divide the total change by the number of hours:
35°F ÷ 7 hours = 5°F per hour
Therefore, the average change in temperature per hour was 5°F.