Final answer:
Geographical factors like altitude, latitude, and proximity to water sources must be considered to estimate average electric usage as they can greatly influence heating, cooling, and overall energy needs.
Step-by-step explanation:
To estimate the average electric usage per month in 64 houses, it is important to consider a variety of geographical factors that can impact energy consumption. These include altitude, as it can affect heating and cooling needs; latitude, which influences the amount of sunlight and hence the potential for natural heating and cooling; and proximity to water sources, which can moderate local climates and affect how much energy is needed for heating or cooling. Understanding these factors can help in making more accurate estimations of electric usage.