| HD | “Hot Day” threshold | the highest observed daily Tmax such that there are 5 other observations equal to or higher than this value |
| CD | “Cold Day” threshold | the lowest observed daily Tmin such that there are 5 other observations equal to or lower than this value |
| SUD | Summer Days | Annual number of days with Tmax above 25˚C |
| DWD | Deep Winter Days | Annual number of days with Tmin below −30˚C |
| WSDI | Warm Spell Duration Index | Annual count of occurrences of at least 5 consecutive days with daily mean T above 90th percentile of historical values for the date |
| CSDI | Cold Spell Duration Index | Same as WDSI, but for daily mean T below 10th percentile |
| Rx1day | Maximum 1-day precipitation in a year | Largest single-day precipitation amount in a calendar year |
| Rx5day | Maximum 1-day precipitation in a year | Largest amount of precipitation over a period of five consecutive days in a calendar year |
| R10mm | Number of heavy precipitation days | Annual count of days with precipitation > 10 mm |
| CWD | Consecutive Wet Days | Annual count of days with precipitation > 10 mm |
| CDD | Consecutive Dry Days | Same as CWD, but for days with precipitation < 1 mm |
| HSD | Heavy Snow Days | The mean of the snow totals for the 5 snowiest days of a year |
| WNDD | Windy Days | Yearly number of days with mean wind speed > 10 m/sec |