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Standard precipitation index classification.
| SPI Category | Moderately dry | Severely dry | Extremely dry | ||
|---|---|---|---|---|---|
| SPI-1 | 1994 | 2014 | 1997 | ||
| 2005 | 2015 | 1998 | |||
| 2006 | 2018 | 2016 | |||
| 2010 | 2019 | ||||
| SPI-3 | 1992 | 2014 | 1998 | ||
| 1997 | 2015 | 2019 | |||
| 2004 | 2016 | ||||
| 2006 | 2018 | ||||
| SPI-6 | 2019 | 2016 | |||
| 2012 | 2015 | ||||
| 1998 | 2018 | ||||
| 2020 | |||||
| SPI-12 | 1998 | 2016 | 2019 | ||
| 2002 | 2020 | ||||
| 2015 | |||||
