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| Nominal start date | ECMWF | Météo-France | Met Office(a) | DWD | CMCC | NCEP | |||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| System 4 | SEAS5 | System 5 | System 6 | System 7 | system=12 | system=13 | system=14 | GCFS2.0 | SPSv3 | CFSv2 | |
| January |  |  | | | | | | | |  | |
| February | | | | | | | | | | | |
| March | | | | | | | | | | | |
| April | | | | | | | | | | | |
| May | | | | | | | | | | | |
| June | | | | | | | | | | | |
| July | | | | | | | | | | | |
| August | | | | | | | | | | | |
| September | | | | | | | | | | | |
| October | | | | | | | | | | | (b) |
| November | | | | | * | | | * | | | *(b) |
| December | | | | | | | | * | | | |
(a) NOTE: For the Met Office contribution, due to the production of hindcasts "on-the-fly", the CDS keyword 'system' does not have the same meaning as for the other contributors. Instead, it is just an indexing label that gets changed once per year.
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