Daily chart answer for Thursday, October 8, 2026
How did monthly sea temperature in the Niño 3.4 region change from 1996 to 1999 (°C anomaly vs. 1991–2020)? Climate · 48 observations · NOAA Climate Prediction Center (ERSST v5).
Solid line = the part players could see · dashed violet = the daily chart’s hidden stretch, revealed here.
What happened
After the visible part ended on Jul 1997, it retreated 211.5% to finish at -1.74°C. Players saw the first 19 of 48 observations before drawing. From -0.86°C to -1.74°C, the net move over the full span is down 0.88°C. The period high of 2.41°C came in Nov 1997; the low of -1.74°C, in Dec 1999. The biggest one-step move was a 168.4% downward in Jun 1998. Data: NOAA Climate Prediction Center (ERSST v5).
The hidden values
After the cutoff (Jul 1997), the series printed:
| 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 |
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