Relative humidity is the amount of moisture in the air relative to your own sensible feelings. the amount of water vapor in the air compared to the normal amount. the amount of water vapor in the air at a given temperature expressed as a percentage of the moisture capacity of the air. a basically unused concept when it comes to weather topics.

I am not in high school so I can not help you with this but my brother might know the answer

Humid continental climate is found in the interior of continents between the 30 and 60 degrees latitude, but usually above the 40 degree line.   40 degrees north of the equator means less direct sunlight and therefore less warmth.   this climate is mainly found in the northern hemisphere since there are no major landmasses in the southern hemisphere.  if you live in northern indiana, you know all about humid continental because that is the climate type you have!