| Term: | Seasonal freezing index |
| Definition: | The cumulative number of degree-days below 0 degrees Celsius, calculated as the arithmetic sum of all the negative and positive mean daily air temperatures (degrees Celsius) for a specific station during the time period between the highest point in the fall and the lowest point the next spring on the cumulative degree-day time curve. |
| Term: | Seasonal freezing index |
| Definition: | The cumulative number of degree-days below 0˚C, calculated as the arithmetic sum of all the negative and positive mean daily air temperatures (˚C) for a specific station during the time period between the highest point in the fall and the lowest point the next spring on the cumulative degree-day time curve |