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Methane (CH₄) in 1983 (global mean)
Annual mean–partial year
vs previous year–
Rank of increase–
Max − min within year18.8 ppb
By month
| Month | Concentration | vs same month last year |
|---|---|---|
| Jan | – | – |
| Feb | – | – |
| Mar | – | – |
| Apr | – | – |
| May | – | – |
| Jun | – | – |
| Jul | 1,626.0 ppb | – |
| Aug | 1,628.1 ppb | – |
| Sep | 1,638.4 ppb | – |
| Oct | 1,644.8 ppb | – |
| Nov | 1,642.6 ppb | – |
| Dec | 1,639.5 ppb | – |
+12.4 ppb
+12.8 ppb
+12.6 ppb
+10.5 ppb
Bars: yearly increase in the surrounding years. NOAA GML global monthly means.