| Abbreviation | Definition |
|---|---|
| CPOL | C-band POLarimetric radar data |
| CPOM | Centre for Polar Observation and Modelling |
| CPOO | Climate Processes Over the Oceans |
| CPRS | Cloud Profiling Radar System |
| CPTR | Compact Payload Test Range |
| CPWW | Critical Peak Wet Weather |
| CPWWFE | Critical Peak Wet Weather Flow Event |
| CQE | Clinical Qualifying Examination |
| CRK | Creek |
| CRONOS | Climate Retrieval and Observations Network Of the Southeast |
| CRREL | Cold Regions Research and Engineering Laboratory |
| CRU | Climate Research Unit |
| CS | Climate Services |
| CSAG | Climate Systems Analysis Group |
| CSF | Computer Straight Forecast |
| CSNE | Climate Solutions New England |
| CSREES | Cooperative State Research, Education, and Extensive Service |
| CSU | CDAS and SOCC Upgrade |
| CTD | Conductivity, Temperature, Depth |
| CTL | Climate TimeLine |