Standardised Precipitation-Evapotranspiration Index in Sao Tome and Principe
Sao Tome and Principe: Standardised Precipitation-Evapotranspiration Index was -0.7011 in 2023. ◆ Volatile
Standardised Precipitation-Evapotranspiration Index in Sao Tome and Principe, 1960–2023
Source: Global SPEI database (SPEIbase). https://spei.csic.es/database.html.
Analysis
In 2023, standardised precipitation-evapotranspiration index in Sao Tome and Principe stood at -0.7011.
That represents a change of down 176.7% on the previous year and down 33.6% over ten years.
Over the whole period, standardised precipitation-evapotranspiration index in Sao Tome and Principe peaked at 2.26 in 2007 and was at its lowest, -2, in 1983.
Sao Tome and Principe ranks 114th of 189 countries on this measure, in the middle of the range.
The series is highly variable year to year, so single readings are best treated with caution.
Standardised Precipitation-Evapotranspiration Index in Sao Tome and Principe, year by year
| Year | Value | Change |
|---|---|---|
| 1960 | 1.8 | — |
| 1961 | 1.44 | -19.6% |
| 1962 | 1.29 | -10.6% |
| 1963 | 0.997 | -22.8% |
| 1964 | -0.9514 | -195.4% |
| 1965 | -1.03 | +8.6% |
| 1966 | 0.3299 | -131.9% |
| 1967 | 0.5268 | +59.7% |
| 1968 | -0.4986 | -194.6% |
| 1969 | 0.1232 | -124.7% |
| 1970 | 0.6243 | +406.7% |
| 1971 | 0.2406 | -61.5% |
| 1972 | -1.18 | -592.3% |
| 1973 | 0.8262 | -169.8% |
| 1974 | -0.9303 | -212.6% |
| 1975 | 0.5916 | -163.6% |
| 1976 | 0.238 | -59.8% |
| 1977 | 0.5235 | +120.0% |
| 1978 | -0.513 | -198.0% |
| 1979 | -1.02 | +99.4% |
| 1980 | -1.36 | +32.7% |
| 1981 | -1.25 | -7.9% |
| 1982 | -1.75 | +40.0% |
| 1983 | -2 | +14.1% |
| 1984 | 1.55 | -177.5% |
| 1985 | 0.519 | -66.5% |
| 1986 | -1.02 | -295.6% |
| 1987 | -1.11 | +9.1% |
| 1988 | 2.17 | -296.0% |
| 1989 | 0.6508 | -70.0% |
| 1990 | 0.614 | -5.7% |
| 1991 | -0.7667 | -224.9% |
| 1992 | -1.55 | +102.2% |
| 1993 | -0.6197 | -60.0% |
| 1994 | -0.654 | +5.5% |
| 1995 | 0.1104 | -116.9% |
| 1996 | 0.6686 | +505.6% |
| 1997 | 0.2452 | -63.3% |
| 1998 | 0.4533 | +84.9% |
| 1999 | 1.33 | +193.5% |
| 2000 | 1.09 | -18.3% |
| 2001 | -0.0678 | -106.2% |
| 2002 | 1.41 | -2174.5% |
| 2003 | -0.5908 | -142.0% |
| 2004 | -0.5224 | -11.6% |
| 2005 | -1.71 | +227.9% |
| 2006 | -1.28 | -25.4% |
| 2007 | 2.26 | -277.1% |
| 2008 | 0.8093 | -64.2% |
| 2009 | -0.0659 | -108.1% |
| 2010 | -1.79 | +2615.0% |
| 2011 | -0.3997 | -77.7% |
| 2012 | 1.4 | -450.4% |
| 2013 | -0.5248 | -137.5% |
| 2014 | -0.6362 | +21.2% |
| 2015 | -1.54 | +141.9% |
| 2016 | -0.9993 | -35.1% |
| 2017 | -0.2614 | -73.8% |
| 2018 | 0.441 | -268.7% |
| 2019 | 0.2998 | -32.0% |
| 2020 | -0.4534 | -251.2% |
| 2021 | -0.3168 | -30.1% |
| 2022 | 0.9135 | -388.4% |
| 2023 | -0.7011 | -176.7% |
Averages by decade
| Decade | Average | Lowest | Highest | Years |
|---|---|---|---|---|
| 1960s | 0.4024 | -1.03 | 1.8 | 10 |
| 1970s | -0.0607 | -1.18 | 0.8262 | 10 |
| 1980s | -0.3592 | -2 | 2.17 | 10 |
| 1990s | -0.0169 | -1.55 | 1.33 | 10 |
| 2000s | 0.1328 | -1.71 | 2.26 | 10 |
| 2010s | -0.4008 | -1.79 | 1.4 | 10 |
| 2020s | -0.1395 | -0.7011 | 0.9135 | 4 |
Countries ranked near Sao Tome and Principe
More environment data for Sao Tome and Principe
- Historical exposure to drought — Land soil moisture anomaly -16.99 Percentage change (2025)
- Historical exposure to drought — Cropland soil moisture anomaly -12.85 Percentage change (2025)
- Standard Deviation, annual growth rate 0 % change on previous year (2025)
- Standard Deviation 0.214 °C (2025)
- Temperature change 1.16 °C (2025)
- Other paper and paperboard — Import quantity, annual growth rate 150 % change on previous year (2024)
- Other paper and paperboard — Import quantity, per capita 0.0001 t per person (2024)
- Other paper and paperboard — Import value, annual growth rate 210.81 % change on previous year (2024)
- Other paper and paperboard — Import value, per capita 0.0005 1000 USD per person (2024)
- Other paper and paperboard, not elsewhere specified — Import -25 % change on previous year (2024)
Frequently asked questions
- What is standardised precipitation-evapotranspiration index in Sao Tome and Principe?
- Standardised precipitation-evapotranspiration index in Sao Tome and Principe was -0.7011 in 2023, according to Global SPEI database (SPEIbase). https://spei.csic.es/database.html.
- What is the highest standardised precipitation-evapotranspiration index recorded in Sao Tome and Principe?
- The highest recorded value was 2.26 in 2007.
- What is the lowest standardised precipitation-evapotranspiration index recorded in Sao Tome and Principe?
- The lowest recorded value was -2 in 1983.
- How does Sao Tome and Principe rank for standardised precipitation-evapotranspiration index?
- Sao Tome and Principe ranks 114th out of 189 countries with data for 2023.
- Is standardised precipitation-evapotranspiration index rising or falling in Sao Tome and Principe?
- Over the last ten years it is down 33.6%. The long-run trend across the full record is volatile.
- Where does this Sao Tome and Principe data come from?
- The figures come from Global SPEI database (SPEIbase). https://spei.csic.es/database.html, published as part of Standardised Precipitation-Evapotranspiration Index. Statizoid updates them automatically from the source API.
Download this data
CSV · JSON — 64 observations, free to reuse under CC BY 4.0 (World Bank Open Data).
About this data
The SPEI fulfills the requirements of a drought index since its multi-scalar character enables it to be used by different scientific disciplines to detect, monitor, and analyze droughts. Like the sc-PDSI and the SPI, the SPEI can measure drought severity according to its intensity and duration, and can identify the onset and end of drought episodes. The SPEI allows comparison of drought severity through time and space, since it can be calculated over a wide range of climates, as can the SPI.