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Methane (CH₄) in 1999 (global mean)
Annual mean1,772.3 ppb
vs previous year+6.7 ppb
Rank of increase21 / 41
Max − min within year15.6 ppb
By month
| Month | Concentration | vs same month last year |
|---|---|---|
| Jan | 1,773.8 ppb | +12.3 |
| Feb | 1,773.9 ppb | +12.4 |
| Mar | 1,774.6 ppb | +11.6 |
| Apr | 1,775.0 ppb | +10.2 |
| May | 1,772.7 ppb | +8.3 |
| Jun | 1,767.3 ppb | +7.0 |
| Jul | 1,762.9 ppb | +6.8 |
| Aug | 1,764.6 ppb | +4.4 |
| Sep | 1,771.0 ppb | +0.3 |
| Oct | 1,776.6 ppb | +0.3 |
| Nov | 1,778.5 ppb | +3.0 |
| Dec | 1,777.2 ppb | +3.1 |
+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
+4.6 ppb
-0.2 ppb
Bars: yearly increase in the surrounding years. NOAA GML global monthly means.