Final answer:
The temperature decreased by 10 degrees from midday at 4 degrees to evening at -6 degrees, indicating a drop in temperature.
Step-by-step explanation:
The question addresses a change in temperature from 4 degrees at midday to -6 degrees in the evening. To calculate the temperature change, take the final temperature and subtract the initial temperature.
Change in Temperature = Final Temperature - Initial Temperature
Change in Temperature = (-6°) - (4°) = -10°
The negative sign indicates that the temperature has decreased. Therefore, the temperature has decreased by 10 degrees.