| Abbreviation | Definition |
|---|---|
| CIDE | Communications Interfaces and Data Exchange |
| CIMSS | Cooperative Institute for Meteorological Satellite Studies |
| CIN | Convective Inhibition |
| CINC | Commanders-in-Chief |
| CIRA | Cooperative Institute for Research in the Atmosphere |
| CLAMS | Chesapeake Lighthouse and Aircraft Measurements for Satellites |
| CLD | Cold |
| CLR | Clear |
| CMA | China Meteorological Association |
| CMAP | Climate Modeling Analysis and Prediction |
| CMAP | CPC Merged Analysis of Precipitation |
| CMC | Canadian Meteorological Center |
| CMDL | Climate Monitoring and Diagnostics Laboratory |
| CME | Coronal Mass Ejection |
| CMFD | China Meteorological Forcing Dataset |
| CMMS | Climate and Meteorological Monitoring System |
| CMOS | Canadian Meteorological and Oceanographic Society |
| CMP | Competitive Medical Plan |
| CMV | Converted Meteorological Visibility |
| CNMOC | Commander Naval Meteorological and Oceanographic Command |