World wine production dropped 10 percent last year, the biggest fall in more than six decades, because of "extreme" climate changes, the body that monitors the trade said Thursday.

"Extreme environmental conditions" including droughts, fires and other problems with climate were mostly to blame for the drastic fall, said the International Organisation of Vine and Wine (OIV) that covers nearly 50 wine producing countries.

Australia and Italy suffered the worst, with 26 and 23 percent drops. Spain lost more than a fifth of its production. Harvests in Chile and South Africa were down by more than 10 percent.

The OIV said the global grape harvest was the worst since 1961, and worse even than its early estimates in November.

In further bad news for winemakers, customers drank three per cent less wine in 2023, the French-based intergovernmental body said.

Director John Barker highlighted "drought, extreme heat and fires, as well as heavy rain causing flooding and fungal diseases across major northern and southern hemisphere wine producing regions."

Although he said climate problems were not solely to blame for the drastic fall, "the most important challenge that the sector faces is climate change.

"We know that the grapevine, as a long-lived plant cultivated in often vulnerable areas, is strongly affected by climate change," he added.

France bucked the falling harvest trend, with a four percent rise, making it by far the world's biggest wine producer.

Wine consumption last year was however at its lowest level since 1996, confirming a fall-off over the last five years, according to the figures.

The trend is partly due to price rises caused by inflation and a sharp fall in wine drinking in China – down a quarter.