Atmospheric methane (CH₄), global monthly mean
Globally averaged concentration of methane in the atmosphere since July 1983, from NOAA's global network of air-sampling sites, in parts per billion. One row per month.
Columns
Stable keys — use them in the API, SQL and code
| Key | Name | Type | Description |
|---|---|---|---|
| month | Month | date | Calendar month (YYYY-MM). |
| year | Year | year | — |
| decimal_date | Decimal date | number | Middle of the month as a fractional year, as given by NOAA. |
| ch4_ppb | Methane | number · ppb | Globally averaged monthly mean Methane in dry air (mole fraction). |
| ch4_trend_ppb | Methane (seasonally adjusted) | number · ppb | NOAA's long-term trend value for the month: the monthly mean with the average seasonal cycle removed. |
| uncertainty | Uncertainty | number · ppb | Uncertainty of the monthly mean; empty where NOAA has not yet computed it (usually the latest year). |
| trend_uncertainty | Trend uncertainty | number · ppb | — |
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