The total temperature rise was 19 degrees.
Temperature express the measure of hotness and coldness, how hot matter is. It measure this thing in terms of any of several arbitrary scales like Fahrenheit temperature scale, absolute scale (kelvin) etc.
In the question statement, the temperature at 10 A.M is 12 degrees Fahrenheit. The temperature at 6:00 A.M. was -7 degrees Fahrenheit.
Here the difference in both the temperatures is as:
12 - (-7) = 21 degrees Fahrenheit
Hence there was an increase in temperature of 21 degrees Fahrenheit.
To learn more about temperature, refer to the link:
https://brainly.com/question/11464844
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