Daily chart answer for Monday, October 12, 2026
How did monthly atmospheric methane worldwide change from 2019 to 2021 (ppb)? Climate · 36 observations · NOAA Global Monitoring Laboratory.
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 Mar 2020, it advanced 1.8% to finish at 1,908.03 ppb. Players saw the first 15 of 36 observations before drawing. From 1,865.05 ppb to 1,908.03 ppb, the full span nets out up 2.3%. The period high of 1,909.27 ppb came in Nov 2021; the low of 1,858.11 ppb, in Jul 2019. The biggest one-step move was a 0.5% upward in Sep 2021. Data: NOAA Global Monitoring Laboratory.
The hidden values
After the cutoff (Mar 2020), the series printed:
| Date | Actual value |
|---|---|
| Apr 2020 | 1,875.81 |
| May 2020 | 1,874.46 |
| Jun 2020 | 1,872.04 |
| Jul 2020 | 1,871.51 |
| Aug 2020 | 1,876.44 |
| Sep 2020 | 1,884.64 |
| Oct 2020 | 1,890.04 |
| Nov 2020 | 1,891.51 |
| Dec 2020 | 1,891.04 |
| Jan 2021 | 1,888.67 |
| Feb 2021 | 1,886.7 |
| Mar 2021 | 1,888.05 |
| Apr 2021 | 1,890.85 |
| May 2021 | 1,891.34 |
| Jun 2021 | 1,888.16 |
| Jul 2021 | 1,886.04 |
| Aug 2021 | 1,892.38 |
| Sep 2021 | 1,902.51 |
| Oct 2021 | 1,907.97 |
| Nov 2021 | 1,909.27 |
| Dec 2021 | 1,908.03 |
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