China has a large territory with clear monsoon and continental climates. The climates in different regions in China vary greatly — thus, the changes of the four seasons vary greatly.

Eventually, Agassiz and others convinced geologists and the general public that a great continental glaciation had extended the polar ice caps far into regions that now enjoy temperate climates.

Although leptospirosis is more common in tropical climates, detection in the continental United States is increasing.