Droughts, heatwaves, extreme rainfall and a record-breaking hurricane had major impacts on health, food and energy security, and economic development, the UN body said in a new report.
"Unfortunately, 2023 was a year of record climatic hazards in Latin America and the Caribbean, WMO Secretary-General Celeste Saulo said in a statement.
"El Nino conditions during the second half of 2023 contributed to a record warm year and exacerbated many extreme events. This combined with rising temperatures and more frequent and extreme hazards due to human-induced climate change," she added.
The report said the mean temperature for 2023 was the highest on record, with Mexico experiencing the fastest warming rate in the region.
Severe drought -- exacerbated by heatwaves -- affected large areas of Latin America, including much of Central America, forcing a reduction in shipping through the Panama Canal.
Further south, parts of Brazil, Peru, Bolivia, Paraguay and Argentina were stricken by wildfires amid record temperatures. Uruguay saw its drinking water supply pushed to the brink.
The report also listed Hurricane Otis, which caused 51 deaths and more than $3 billion in damages when it struck the Mexican resort city of Acapulco in October.
- 'Acute food crisis' -
Brazil was hit by extreme floods and landslides in 2023 that killed dozens of people and caused massive economic losses and displacement, said the WMO.
The South American giant is once again in the grip of floods ravaging its southern Rio Grande do Sul state, where the death toll on Wednesday reached 100.
The report said sea levels rose at a higher rate than the global average in much of the Atlantic part of the region, threatening coastal areas and small island states.
Climate disasters hit agriculture and food security, with 13.8 million people having faced "acute food crisis" -- especially in Central America and the Caribbean, according to the WMO.
Sea temperature rises also reduced fishing catches in countries like Peru and Ecuador.
The report said economic damage of about $21 billion was reported for the region in 2023, mainly due to storms. Almost half of the damage was associated with Hurricane Otis.
"The actual amount of damage is likely to be worse because of under-reporting and because data on impacts are not available for some countries," it added.
"This is especially the case for heat-related extremes."
The report showed that changing rainfall patterns and warming temperatures were widening the geographic distribution of diseases such as malaria.
"In 2019, over three million cases of dengue were reported in the Americas, the highest number on record. This number was exceeded in the first seven months of 2023," it said.
The findings, said the WMO, illustrated that the region must invest more in forecasting and early-warning systems.
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