Floods, extreme precipitation, droughts and melting glaciers: many of the major signs of climate change involve water. On this year’s World Meteorological Day, the United Nations Meteorological Agency (WMO) is reinforcing the World Water Day message by focusing on the links between climate and water, and calling for better water-related data. In a message to mark the day, UN Secretary-General António Guterres said that climate and water are “inextricably linked. Both lie at the heart of the global goals on sustainable development, climate change and disaster risk reduction.” “Water,” he continued, “is one of the most precious commodities of the 21st century. The national meteorological and hydrological services will be central to efforts to count every drop, because every drop counts.”