How did monthly CO₂ at Mauna Loa change from 1960 to 1962 (ppm)?
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 (Mar 1961), the actual values were:
| Date | Actual value |
|---|---|
| Apr 1961 | 319.48 |
| May 1961 | 320.58 |
| Jun 1961 | 319.77 |
| Jul 1961 | 318.56 |
| Aug 1961 | 316.79 |
| Sep 1961 | 314.99 |
| Oct 1961 | 315.31 |
| Nov 1961 | 316.1 |
| Dec 1961 | 317.01 |
| Jan 1962 | 317.94 |
| Feb 1962 | 318.55 |
| Mar 1962 | 319.68 |
| Apr 1962 | 320.57 |
| May 1962 | 321.02 |
| Jun 1962 | 320.62 |
| Jul 1962 | 319.61 |
| Aug 1962 | 317.4 |
| Sep 1962 | 316.24 |
| Oct 1962 | 315.42 |
| Nov 1962 | 316.69 |
| Dec 1962 | 317.7 |
About this dataset
- Category: Climate
- Source: NOAA Global Monitoring Laboratory
- Date range: Jan 1960 – Dec 1962
- Data points: 36
- Source fetched: Nov 10, 2026
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