| Abbreviation | Definition |
|---|---|
| CTR | Controlled Tornado Research |
| Cu | Cumulus |
| CVW | Clockwise Veering Warm |
| CW | Coefficient of Wind |
| CW | Cold Weather |
| CW | Column Water |
| CWA | County Weather Area |
| CWEC | Canadian Weather year for Energy Calculations |
| CWEEDS | Canadian Weather Energy and Engineering Datasets |
| CWG | Climate Working Group |
| CWMP | Cooperative Well Measuring Program |
| CWN | Conversations With Nostradamus |
| CWOP | Citizen Weather Observer Program |
| CWR | Crop Water Requirement |
| DA | Density Altitude |
| DA | Dry Air |
| DARN | Dual Auroral Radar Network |
| DART | Dynamic Air Release Technology |
| DAWN | Doppler Aerosol WiNd (LIDAR q.v. system) |
| DBK | DayBreak |