How did monthly sea temperature in the Niño 3.4 region change from 1996 to 1999 (°C anomaly vs. 1991–2020)?
This is a real historical chart. Extraplot shows you the beginning and asks you to draw what happens next, then reveals the actual line. Below is the full series with the reveal point marked.
Solid line = visible part you would draw from · dashed violet = the actual revealed data after the cutoff.
The reveal
After the cutoff (Jul 1997), the actual values were:
| Date | Actual value |
|---|---|
| Aug 1997 | 1.89 |
| Sep 1997 | 2.13 |
| Oct 1997 | 2.36 |
| Nov 1997 | 2.41 |
| Dec 1997 | 2.29 |
| Jan 1998 | 2.38 |
| Feb 1998 | 2.03 |
| Mar 1998 | 1.34 |
| Apr 1998 | 0.78 |
| May 1998 | 0.57 |
| Jun 1998 | -0.39 |
| Jul 1998 | -0.99 |
| Aug 1998 | -1.28 |
| Sep 1998 | -1.26 |
| Oct 1998 | -1.46 |
| Nov 1998 | -1.46 |
| Dec 1998 | -1.69 |
| Jan 1999 | -1.69 |
| Feb 1999 | -1.32 |
| Mar 1999 | -0.95 |
| Apr 1999 | -1.11 |
| May 1999 | -1.15 |
| Jun 1999 | -1.19 |
| Jul 1999 | -1.17 |
| Aug 1999 | -1.22 |
| Sep 1999 | -1.09 |
| Oct 1999 | -1.23 |
| Nov 1999 | -1.58 |
| Dec 1999 | -1.74 |
About this dataset
- Category: Climate
- Source: NOAA Climate Prediction Center (ERSST v5)
- Date range: Jan 1996 – Dec 1999
- Data points: 48
- Source fetched: Nov 10, 2026
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