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
Monthly
| Climate Index | Annual Average Plot |
|---|---|
| Southern Annular Mode (SAM) (20CRV2c) |  |
| Antarctic Oscillation (AAO) |  |
| North Pacific Index (NP) (20CRV2c) |  |
| Arctic Oscillation (AO) (also 20CRV2c) |  |
| North Atlantic Oscillation (NAO) (also 20CRV2c) | |
| Southern Oscillation (SOI) (also 20CRV2c) |  |
| Pacific North American Pattern (PNA) (also 20CRV2c) |  |
Daily
- Arctic Oscillation (AO) (1871-2012)
- Antarctic Oscillation (AAO) (1871-2012)