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Methane (CH₄) in 1997 (global mean)
Annual mean1,754.6 ppb
vs previous year+3.3 ppb
Rank of increase33 / 41
Max − min within year15.9 ppb
By month
| Month | Concentration | vs same month last year |
|---|---|---|
| Jan | 1,753.4 ppb | +1.2 |
| Feb | 1,753.9 ppb | +1.1 |
| Mar | 1,755.7 ppb | +3.4 |
| Apr | 1,755.5 ppb | +5.9 |
| May | 1,753.8 ppb | +5.5 |
| Jun | 1,750.1 ppb | +4.1 |
| Jul | 1,746.0 ppb | +4.0 |
| Aug | 1,747.8 ppb | +3.5 |
| Sep | 1,755.0 ppb | +2.4 |
| Oct | 1,760.3 ppb | +1.4 |
| Nov | 1,761.7 ppb | +1.7 |
| Dec | 1,761.9 ppb | +5.0 |
+10.5 ppb
+1.1 ppb
+5.6 ppb
+6.7 ppb
+2.4 ppb
+3.3 ppb
+11.1 ppb
+6.7 ppb
+0.9 ppb
-1.9 ppb
+1.4 ppb
Bars: yearly increase in the surrounding years. NOAA GML global monthly means.