| 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. NSIDCCryosphere
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 IPAPermafrost GCW |