| TAF amendment response time results by issuing office for December 2011 | ||||||||
| EC Weather Centre Location | Number of observations not covered by current TAF | Number responded to by an amended TAF | Number responded to by next regular TAF | Number where weather changed back to match TAF | Number where weather and TAF remained inconsistent | Average response time in minutes | Percentage of TAF responses within 20 minutes | Number of proactive amendments |
| Montreal | 3309 | 2128 | 213 | 959 | 9 | 17 | 68% | 1426 |
| Edmonton | 2706 | 1903 | 162 | 597 | 44 | 15 | 80% | 1677 |
| National | 6015 | 4031 | 375 | 1556 | 53 | 16 | 74% | 3103 |