Answer:
Thursday.
Explanation:
Distance from 0°F:
Monday: 0-(-4) = 4°F
Tuesday: 0-(-1) = 1°F
Wednesday: 0-(-3) = 3°F
Thursday: 0-(-6) = 6°F
Friday: 0-(-2) = 2°F
Since Thursday has the biggest distance from 0°F (6°F), it is the day when the temperature is the farthest from 0°F.