What is the approximate longitude of the most easterly boundary of the united states

The most eastern point in the United States of America is in Alaska at 165 degrees east. This is because there are Alaskan territories that are so far westward that they enter the Eastern part of the world and therefore make Alaska both the most western territory and the most eastern territory at the same time.

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!