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Frigid Forecast

Solution

Monday: ⁺7°F
Tuesday: ⁺22°F
Wednesday: ⁺2°F
Thursday: ^-5°F
Friday: ^-4°F
Saturday: ⁺1°F

Explanation

1. Tuesday was the warmest day of the week, but still was only 10 degrees below freezing.
   Freezing is 32° Fahrenheit.
   32°F − 10°F = 22° F
   Tuesday's temperature was 22° F.
   
   That was 15°F warmer than the day before.
   Tuesday was 15°F warmer than Monday.
   Monday's temperature + 15°F = Tuesday's temperature.
   Subtract 15°F from Tuesday's temperature to find the warmer temperature for Monday:
   22°F − 15°F = ⁺7°F
   Monday's temperature was ⁺7°F.
   
   
2. On Wednesday the temperature was 5°F colder than on Monday.
   Start with Monday's temperature and subtract: ⁺7°F − 5°F = ⁺2°F
   Wednesday was ⁺2°F.
3. Thursday was even 1°F colder than Friday.
   Skip this clue now and find out Friday's temperature.
4. Friday's temperature was 6°F below Wednesday's.
   Wednesday's temperature was ⁺2°F.
   Subtract: ⁺2°F − 6°F = ^-4°F
5. Now go back to find Thursday's temperature:
   Friday's temperature was ⁻4°F.
   Thursday was 1°F colder than Friday.
   So, subtract:
   ^-4°F − 1°F = ^-5°F
   Thursday's temperature was ^-5°F.
6. It was 5°F warmer on Saturday than on Friday.
   Add:
   Friday's temperature plus the increase: ⁻4°F + 5°F:
   ^-4°F + 5°F = ⁺1°F
   Saturday's temperature was ⁺1°F.