Based on the search results, the months with the lowest temperature ranges in Cameroon are July and September. These months are part of the cool season, which lasts for 2.1 months from July 5 to September 10, with an average daily high temperature below 83°F. However, it is important to note that Cameroons climate is tropical, with a dry season and a wet season, and the temperature and rainfall patterns vary based on the altitude and region. For example, the north has a semi-arid and hot climate, while the south-central plateau has pleasant, less intense temperatures.