Mexico's social development secretary says an estimated 600,000 households suffered property damage or crop losses due to an unusual combination of floods, drought and freezing weather in 2011.
Heriberto Felix Guerra says the drought has been so bad that about 2.6 million people in about 1,650 villages and towns in northern Mexico do not even have drinking water.
Felix Guerra's agency has helped truck in water to those communities.
He said that hundreds of other communities in the country's southeast had suffered persistent flooding.
He said in a statement Sunday that the extreme weather appeared to be caused by climate change, and predicted that such natural disasters will become worse in coming years.