To determine when it was coldest, we can compare the recorded temperatures at the given times:
- At 5:00 PM: –20°F
- At 6:00 PM: –30°F
- At 9:00 PM: –23°F
The lowest temperature recorded is –30°F at 6:00 PM. Therefore, it was coldest at 6:00 PM.
At 5:00 PM the temperature was –20°F, at 6:00 PM the temperature was –30°F, and at 9:00 PM the temperature was –23°F. When was it coldest?
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