Climate Prediction Center of the National Oceanic and Atmospheric Administration

the data of the Northern Hemisphere teleconnection patterns, including the Arctic Oscillation (AO) index, North Atlantic Oscillation (NAO) index, East Atlantic pattern (EA) index, East Atlantic-Western Russia pattern (EAWR) index, East Pacific-North Pacific pattern (EPNP) index and Polar-Eurasian pattern (PEU) index are collected from the Climate Prediction Center of the National Oceanic and Atmospheric Administration (NOAA)