For those seeking information on the climate conditions of the past, a good source of information are the writings of the early geographers.
For example ( and this is not a comprehensive list):
First, there is Herodotus (5th Century BCE)- and, yes! some of his information is fanciful, but not more so than usual for the time.
Second, Strabo and his Geography. Strabo lived (circa) 64BCE to 20 CE.
Third, we could list Ptolemy ( 100 - 178 CE) and his Geographike Hyphegesis.
And in the Islamic era, we could look for the writings of very scholarly works by Al Idrisi, Ibn Battutah and Ibn Khaldoun.
Geographical information is found in lots of other sources also. In written Chinese records we can find descriptions of the climate etc, in the Tarim basin (in modern Xinjiang), as the early Han dynasty (BCE) were exploring this area. The early Silk Road trade routes had to cross this area and the feared Taklamakan desert in the centre featured in lots of travel stories. Two main routes to miss the desert developed, one to the north and one to the south, skirting the edges of the mountains that bordered the basin. Conditions today, are much the same as described in early writings.
Better to base your understanding on the writings of men who attempted to describe the world around them, than on semi-religious writings threatening divine retribution to political enemies.