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| Nominal Start Dates | C3S multi-system operational components ('system' keyword values) | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| ECMWF | Météo-France | UK MetOffice | DWD | CMCC | NCEP | JMA | ECCC | BOM | |
| September 2017 - October 2017 | 4 | 5 | 12 | ||||||
| November 2017 - April 2018 | 5 | 5 | 12 (1) | ||||||
| May 2018 - October 2018 | 5 | 5 | 13 | ||||||
| November 2018 - April 2019 | 5 | 6 | 13 | 2 | 3 | ||||
| May 2019 - September 2019 | 5 | 6 | 14 (2) | 2 | 3 | ||||
| October 2019 - April 2020 | 5 | 7 | 14 | 2 | 3 | 2 | |||
| May 2020 - September 2020 | 5 | 7 | 15 | 2 | 3 | 2 | |||
| October 2020 | 5 | 7 | 15 | 2 | 35 | 2 | 2 | ||
| November 2020 - February 2021 | 5 | 7 | 15 | 21 | 35 | 2 | 2 | ||
| March 2021 - April 2021 | 5 | 7 | 600 | 21 | 35 | 2 | 2 | ||
| May 2021 - June 2021 | 5 | 7 | 600 | 21 | 35 | 2 | 2 | 1 and 2 | |
| July 2021 - November 2021 | 5 | 8 | 600 | 21 | 35 | 2 | 2 | 1 and 2 | |
| December 2021 - January 2022 | 5 | 8 | 600 | 21 | 35 | 2 | 2 | 2 and 3 | |
| February 2022 | 5 | 8 | 600 | 21 | 35 | 2 | 3 | 2 and 3 | |
| March 2022 - October 2022 | 5 | 8 | 601 | 21 | 35 | 2 | 3 | 2 and 3 | |
| November 2022 - Februrary 2023 | 51 (3) | 8 | 601 | 21 | 35 | 2 | 3 | 2 and 3 | |
| March 2023(4) - February 2024 | 51 | 8 | 602 | 21 | 35 | 2 | 3 | 2 and 3 | |
| March 2024 - June 2024 | 51 | 8 | 603 | 21 | 35 | 2 | 3 | 2 and 3 | |
| July 2024 | 51 | 8 | 603 | 35 | 2 | 3 |
| ||
| August 2024 - February 2025 | 51 | 8 | 603 | 21 | 35 | 2 | 3 | 4 and 5 | |
| March 2025 | 51 | 8 | 604 | 21 | 35 | 2 | 3 | 4 and 5 | |
| April 2025 | 51 | 8 | 604 | 22 | 35 | 22 | 3 | 4 and 5 | |
Legend:
| bold font | forecast systems introduced for the first time at the beginning of the nominal start dates range |
| non-bold font | forecast systems that were excluded from the multi-system at that time |
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