| Term: | Air freezing index |
| Definition: |
The cumulative number of degree-days below 0˚ C for the air temperature during a given time period IPAPermafrost
The cumulative number of degree-days below 0C for the air temperature during a given time period. The Air Freezing Index differs from the corresponding surface Freezing Index (see n-factor). SUM (T_1) < 0 TrombottoGeocryology GCW |