| Metric | Name in hotspell | Description | Reference |
|---|---|---|---|
| CTN90PCT | ctn90pct | Tmin > calendar day 90th pt, 15-day window, at least 3 days | Perkins & Alexander 2013 |
| CTN95PCT | ctn95pct | Tmin > calendar day 95th pt, 15-day window, at least 3 days | |
| CTX90PCT | ctx90pct | Tmax > calendar day 90th pt, 15-day window, at least 3 days | Perkins & Alexander 2013 |
| CTX95PCT | ctx95pct | Tmax > calendar day 95th pt, 15-day window, at least 3 days | |
| Hot days | hot_days | Tmax > 35 °C | Collins et al. 2000 |
| Hot events (day) | hot_events_daytime | Tmax > 35 °C, at least 3 to 5 days (default 3 days in hotspell) | Collins et al. 2000 |
| Hot events (night) | hot_events_nighttime | Tmin > 35 °C, at least 3 to 5 days (default 3 days in hotspell) | Collins et al. 2000 |
| SU (summer days) | summer_days | Tmax > 25 °C | Alexander et al. 2006 |
| TN90P | tn90p | Tmin > calendar day 90th pt, 5-day window | Alexander et al. 2006 |
| TR (tropical nights) | tropical_nights | Tmin > 20 °C | Alexander et al. 2006 |
| TX90P | tx90p | Tmax > calendar day 90th pt, 5-day window | Alexander et al. 2006 |
| WSDI | wsdi | Tmax > calendar day 90th pt, 5-day window, at least 6 days | Alexander et al. 2006 |