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| Index | Description | Definition |
| Intensity Indices | TXx | Hottest day | Highest maximum temperature in a year |
| TXn | Coldest day | Lowest maximum temperature in a year | |
| TNx | Hottest night | Highest minimum temperature in a year | |
| TNn | Coldest night | Lowest minimum temperature in a year | |
| Frequency indices with percentile thresholds | TX90p | Hot days | Percentage of days in a year with maximum temperature above 90th percentile of daily maximum temperature distribution in the 1971-2000 baseline period |
| TN90p | Hot nights | Percentage of days in a year with minimum temperature above 90th percentile of daily minimum temperature distribution in the 1971-2000 baseline period | |
| TX10p | Cold days | Percentage of days in a year with maximum temperature below 10th percentile of daily maximum temperature distribution in the 1971-2000 baseline period | |
| TN10p | Cold nights | Percentage of days in a year with minimum temperature below 10th percentile of daily minimum temperature distribution in the 1971-2000 baseline period | |
| Range index | DTR | Diurnal temperature range | Annual mean of difference between maximum temperature and minimum temperature |