To find the temperature at 5:00 AM, we need to calculate how much the temperature has dropped from midnight.

1. Starting temperature at midnight: $-12^\circ F$
2. Total drop over the next 5 hours: $-18^\circ F$

Now, add the drop to the starting temperature:

$-12^\circ F - 18^\circ F = -30^\circ F$

So, the temperature at 5:00 AM is $-30^\circ F$.

Would you like more details or have any other questions?

Here are 5 related questions to explore further:

1. What would the temperature be if it dropped another 10 degrees by 6:00 AM?
2. If the temperature rises 15 degrees from 5:00 AM, what will it be?
3. What is the average rate of temperature drop per hour from midnight to 5:00 AM?
4. If the temperature was $-12^\circ F$ at midnight and $-30^\circ F$ at 5:00 AM, what was the total change in temperature?
5. How would the temperature change if it increased by 5 degrees every hour after 5:00 AM?

Tip: When dealing with temperature changes, adding a negative value indicates a decrease, while adding a positive value indicates an increase!