A warm front<span> is where a </span>warm air mass is pushing into a colder air mass, <span>https://www.windows2universe.org/earth/Atmosphere/tstorm/warm_front.html.
</span>QUICK ANSWER<span>A warm front occurs when a cold air mass retreats and is replaced by a warm air mass. Warm fronts typically bring some form of precipitation to the area.<span>CONTINUE READING</span></span>
The main reason is that the USA is in the Northern Hemisphere & Australia is in the Southern Hemisphere. It has all to do with the tilt of the earth as it revolves around the Sun. Summer happens in the hemisphere tilted towards the Sun, and winter happens in the hemisphere tilted away from the Sun.
The valley of Mexico is a highlands plateau in central Mexico roughly coterminous with the Present-day Mexico city and the Eastern half of the State of Mexico
