20CR Climate Indices

We are beginning to calculate 20CRV2c versions in addition to 20CRV2. If a version from 20CRV2c is available, it will be noted in the table


Climate IndexAnnual Average Plot
Southern Annular Mode (SAM)
Antarctic Oscillation (AAO)
North Pacific Index (NP)
Arctic Oscillation (AO)
(also 20CRV2c)
North Atlantic Oscillation (NAO)
(also 20CRV2c)
Southern Oscillation (SOI)
(also 20CRV2c)
Pacific North American Pattern (PNA)
(also 20CRV2c)


Tools to Plot/Use 20CR Climate Indices

  1. Climate Index Plotting Page
  2. GCOS Mapping Page