Climate change greatly influences ecosystems, communities, and economies, the effects of climate change on water supplies, environmental conditions, and weather patterns will typically have both abrupt and gradual impacts on all three categories, in Iraq, the geographical analysis focused on the annual concentration of precipitation, the high-resolution climate grid (0.5×0.5) used in this analysis provided information for the period of 1956 to 2025, it used an initial 5-year period and the final 5-year period within each decade, the use of Geographic Information Systems (GIS) enabled the study to achieve the objectives of this analysis, rainfall figures reflect great variability among the rainfalls recorded within the different decades of the second millennium, in the 6th decade of the 20th century, annual rainfall ranged from 21–1047 mm, in the seventh decade between 32–1080 mm, in the 8th decade between 105–1082 mm, in the 9th decade between 110–1037 mm, and in the 10th decade between 98–1091 mm, even though there were large fluctuations from one rainy season to another, both 5-year periods within each of the three decades had relatively consistent rainfall amounts, while there was a pronounced decrease from monthly to long-term intensity during the first and second decades of the third millennium, the total volume of precipitation recorded was significantly lower than the previous two decades; for example, during the first decade of the 3rd millennium total amount of precipitation was 114–986 mm, and during the second decade total amount of precipitation was 89–987 mm, precipitation has been highest near those regions which experience the most rainfall (northeast and north), while precipitation amounts are substantially less in southern and southwest Iraq, the annual rainfall averages are well below those seen at the end of the twentieth century and over the last few decades as a consequence of climate change, the average annual precipitation amounts from the rainfall maps vary from 76 mm to 1,014 mm, while the average annual precipitation amount for the 2010's was 1,065 mm, the northern areas have consistently received more precipitation than the southern areas, which are mostly dry, therefore, Iraq is already suffering from decreased precipitation due to the ongoing effects of variability in rainfall patterns, as a result, there is an urgent need to examine different sources of water and the efficient use of what falls as precipitation.