Posted 29 January 2012 - 05:23 PM
In fact the very tail end of cold fronts from Antarctica do make it to Manaus, 3.25 degrees south. These events are known as FRIAGEM locally. But, that being said what is the normal effect is that the daytime temperatures stay under 80 degrees F. I have seen days where the temperatures stayed around 74 F which is cold for here. The night time temperatuers still stay in the normal range though from 72 to 74 F. On the other side of the equator here in Boa Vista, Roraima cold fronts do not get there from the north. They have to go across the Caribbean and the mountains in Venezuela and Guiana and do not get that far south. As to Belem I do not know if they cold fronts get there or not as I have not paid attention to this. Belem also has some influence from the Atlantic ocean which is not that far away, as well as the estuary of the Amazon river which is an enormous area. The cold fronts that get here arrive in the hottest part of the year which is the dry season. People pull out there sweaters when the temperature stays below 80 F.
As to why is it always warm here. At 3.25 S. latitude and around 200 feet above sea level hot is the norm. The main factor that modifies temperture is rain. Now is the rainy season which is known as the Amazonian winter. Even though we are in the southern hemisphere summer. The hottest time fo the year is the dry season in the months of August, September and October.
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