United States
citation: https://www.imagepermanenceinstitute.org/webfm_send/635
Quick Summary: East of the 100th meridian (the general dividing line between the dry and humid climates) are the humid subtropical climate of SE United States and the humid continental climate of NE United States.
Like most land masses located in the middle and lower middle latitudes, the primary drivers of weather in the contiguous United States are the seasonal change in the solar angle, the migration north/south of the subtropical highs, and the seasonal change in the position of the polar jet stream.
Canada
citation: http://www.ec.gc.ca/eau-water/3E75BC40-74F5-4BF9-BB3B-3F3A761EBE8D/a9f1e.gif
Quick Summary: Canada is often associated with cold weather and snow, but in reality, its climate is as diverse as its landscape. Generally, Canadians enjoy four very distinct seasons, particularly in the more populated regions along the US border. Daytime summer temperatures can rise to 35°C and higher, while lows of -25°C are not uncommon in winter. More moderate temperatures are the norm in spring and fall.
Summers can be hot and dry on the prairies, humid in central Canada, and milder on the coasts. Spring is generally pleasant across the country. Autumns are often crisp and cool, but brightened by rich orange and red leaves on trees.