Daily chart answer for Tuesday, October 13, 2026
How did Arctic sea ice extent each September change from 1995 to 2009 (million km²)? Climate · 15 observations · NSIDC Sea Ice Index v4.
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 2000, it ticked down 15.8% to finish at 5.26 million km². Players saw the first 6 of 15 observations before drawing. From 6.08 million km² to 5.26 million km², the full span nets out down 13.5%. The period high of 7.58 million km² came in 1996; the low of 4.27 million km², in 2007. The biggest one-step move was a 27.1% downward in 2007. Data: NSIDC Sea Ice Index v4.
The hidden values
After the cutoff (2000), the series printed:
| Date | Actual value |
|---|---|
| 2001 | 6.73 |
| 2002 | 5.83 |
| 2003 | 6.12 |
| 2004 | 5.98 |
| 2005 | 5.5 |
| 2006 | 5.86 |
| 2007 | 4.27 |
| 2008 | 4.69 |
| 2009 | 5.26 |
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