The provided graphs present comparative data on rainfall in hot desert climate grasslands in 1980 and 2000. Overall, a striking observation is that in 1980 the precipitation was substantially higher than its 2000 counterpart. Additionally, during the same year, the pattern demonstrated greater variability throughout the year than two decades after, when changes from one month to another were quite gradual.
The highest peak of rainfall in 1980 was about 325mm in March, while in 2000 it was about one sixth of that, around 53mm, during the months of July, August, and November. The lowest volume of precipitation over the two decades was 47mm and it took place in March and April 2000, while in 1980 the highest trough was slightly over 150mm in July. During the first half of the year, 1980 experienced a rise and a fall, whereas the first six months of 2000 witnessed a fall, subsequently followed by a recovery. During the second half of 1980, a gradual increase in precipitation is observable from the graph, while its 2000 counterpart shows a drop, followed by a peak, to then drop again.
During 2000, there was not a significant difference between the levels of precipitation during each of the different months, fluctuating from 42mm to 52mm, while in 1980 the range was greatly larger, varying from 160mm to 325mm. This comparison highlights that the rain volume shifted greatly to a more stable pattern in 2000.