How did monthly sea temperature in the Niño 3.4 region change from 1980 to 1983 (°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 1981), the actual values were:
| Date | Actual value |
|---|---|
| Aug 1981 | -0.53 |
| Sep 1981 | -0.19 |
| Oct 1981 | -0.3 |
| Nov 1981 | -0.41 |
| Dec 1981 | -0.2 |
| Jan 1982 | 0.13 |
| Feb 1982 | -0.17 |
| Mar 1982 | 0.13 |
| Apr 1982 | 0.21 |
| May 1982 | 0.45 |
| Jun 1982 | 0.53 |
| Jul 1982 | 0.37 |
| Aug 1982 | 0.73 |
| Sep 1982 | 1.49 |
| Oct 1982 | 1.99 |
| Nov 1982 | 1.92 |
| Dec 1982 | 2.2 |
| Jan 1983 | 2.35 |
| Feb 1983 | 1.94 |
| Mar 1983 | 1.38 |
| Apr 1983 | 0.95 |
| May 1983 | 0.9 |
| Jun 1983 | 0.54 |
| Jul 1983 | -0.11 |
| Aug 1983 | -0.27 |
| Sep 1983 | -0.52 |
| Oct 1983 | -1.16 |
| Nov 1983 | -1.29 |
| Dec 1983 | -1.03 |
About this dataset
- Category: Climate
- Source: NOAA Climate Prediction Center (ERSST v5)
- Date range: Jan 1980 – Dec 1983
- Data points: 48
- Source fetched: Nov 10, 2026
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