| Term: | Design freezing index |
| Definition: | The cumulative number of degree-days below 0 degrees Celsius, calculated by taking the average of the seasonal freezing indices for the three coldest winters in the most recent 30 years of record. |
| Term: | Design freezing index |
| Definition: | The cumulative number of degree-days below 0˚C, calculated by taking the average of the seasonal freezing indices for the three coldest winters in the most recent 30 years of record |