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Methane (CH₄) in 1991 (global mean)
Annual mean1,725.0 ppb
vs previous year+10.4 ppb
Rank of increase13 / 41
Max − min within year23.6 ppb
By month
| Month | Concentration | vs same month last year |
|---|---|---|
| Jan | 1,721.8 ppb | +9.8 |
| Feb | 1,721.4 ppb | +8.1 |
| Mar | 1,722.1 ppb | +7.8 |
| Apr | 1,722.4 ppb | +9.9 |
| May | 1,722.1 ppb | +11.5 |
| Jun | 1,718.8 ppb | +10.4 |
| Jul | 1,715.9 ppb | +9.4 |
| Aug | 1,719.1 ppb | +8.9 |
| Sep | 1,726.0 ppb | +8.4 |
| Oct | 1,732.8 ppb | +10.6 |
| Nov | 1,737.6 ppb | +14.0 |
| Dec | 1,739.6 ppb | +16.2 |
+12.8 ppb
+12.6 ppb
+10.5 ppb
+11.3 ppb
+9.9 ppb
+10.4 ppb
+10.5 ppb
+1.1 ppb
+5.6 ppb
+6.7 ppb
+2.4 ppb
Bars: yearly increase in the surrounding years. NOAA GML global monthly means.