The Southern Plains has a low-pressure system was strengthening and connected multiple fronts. The most distinguishable front dropping south-southwest through west Texas, was a cold front. This is because of the geographical location of the panhandles as they are found in the extreme north west region of the country with lots of plains . This setting favours the movement of cold air from the Arctic region.
By looking at the map that shows a portion of the western United States and Canada. The graph that best represents the average monthly air temperature for both Vancouver and Winnipeg is the fourth graph or number 4.
