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Methane (CH₄) in 1987 (global mean)
Annual mean1,682.8 ppb
vs previous year+12.6 ppb
Rank of increase4 / 41
Max − min within year15.6 ppb
By month
| Month | Concentration | vs same month last year |
|---|---|---|
| Jan | 1,679.4 ppb | +13.1 |
| Feb | 1,679.0 ppb | +12.1 |
| Mar | 1,680.0 ppb | +10.8 |
| Apr | 1,681.4 ppb | +10.6 |
| May | 1,681.9 ppb | +13.4 |
| Jun | 1,680.0 ppb | +15.2 |
| Jul | 1,676.0 ppb | +13.6 |
| Aug | 1,677.2 ppb | +12.8 |
| Sep | 1,685.6 ppb | +13.0 |
| Oct | 1,691.5 ppb | +12.9 |
| Nov | 1,691.2 ppb | +12.2 |
| Dec | 1,690.5 ppb | +11.4 |
+12.4 ppb
+12.8 ppb
+12.6 ppb
+10.5 ppb
+11.3 ppb
+9.9 ppb
+10.4 ppb
+10.5 ppb
Bars: yearly increase in the surrounding years. NOAA GML global monthly means.