From 250 to 800 AD, the Mayan civilization was still very developed, the city prospered, and the crop harvest was also very gratifying  Climate records show that the precipitation in the Maya region during this period was relatively high  After that, the Mayan civilization began to decline  From about 820 AD for 95 consecutive years, the region began to experience intermittent droughts, and droughts in some places even lasted for decades
Most Mayan cities declined between 850 AD and 925 AD, which coincides with the time of drought.
 Many experts believe that climate change in the 9th century may be the cause of the demise of the Mayan civilization