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Data

Methane, global annual mean

Annual mean methane in dry air averaged over NOAA's global network of marine surface air-sampling sites, since 1984.

Latest value

1,935.94ppb

Global mean of marine surface sites, 2025 (preliminary). Version 2026-09.

Methane, global annual mean (parts per billion)

42 values from 1984 to 2025. The shaded band is the uncertainty range the producer gives.
Show as a table
Methane, global annual mean, every value
PeriodValue (ppb)RangeStatus
19841,644.841,644.24 to 1,645.44final
19851,657.301,656.75 to 1,657.85final
19861,670.091,669.32 to 1,670.86final
19871,682.711,682.20 to 1,683.22final
19881,693.191,692.57 to 1,693.81final
19891,704.551,704.02 to 1,705.08final
19901,714.431,713.74 to 1,715.12final
19911,724.791,724.11 to 1,725.47final
19921,735.471,734.89 to 1,736.05final
19931,736.481,736.01 to 1,736.95final
19941,742.081,741.51 to 1,742.65final
19951,748.881,748.36 to 1,749.40final
19961,751.301,750.67 to 1,751.93final
19971,754.511,754.13 to 1,754.89final
19981,765.571,764.96 to 1,766.18final
19991,772.301,771.74 to 1,772.86final
20001,773.221,772.52 to 1,773.92final
20011,771.291,770.77 to 1,771.81final
20021,772.681,772.22 to 1,773.14final
20031,777.331,776.82 to 1,777.84final
20041,777.131,776.64 to 1,777.62final
20051,774.231,773.64 to 1,774.82final
20061,774.931,774.43 to 1,775.43final
20071,781.311,780.75 to 1,781.87final
20081,787.011,786.45 to 1,787.57final
20091,793.511,792.92 to 1,794.10final
20101,798.931,798.22 to 1,799.64final
20111,803.031,802.47 to 1,803.59final
20121,808.071,807.49 to 1,808.65final
20131,813.421,812.85 to 1,813.99final
20141,822.581,822.02 to 1,823.14final
20151,834.191,833.70 to 1,834.68final
20161,843.181,842.60 to 1,843.76final
20171,849.621,848.93 to 1,850.31final
20181,857.331,856.56 to 1,858.10final
20191,866.591,866.02 to 1,867.16final
20201,878.721,878.06 to 1,879.38final
20211,894.791,894.16 to 1,895.42final
20221,910.951,910.06 to 1,911.84final
20231,921.401,920.70 to 1,922.10final
20241,929.411,928.82 to 1,930.00final
20251,935.941,935.46 to 1,936.42preliminary
NOAA Global Monitoring Laboratory (Lan, Thoning & Dlugokencky), version 2026-09, doi:10.15138/P8XG-AA10. Public domain (work of the US federal government).

Where it comes from

Producer
NOAA Global Monitoring Laboratory · Trends in globally-averaged methane, nitrous oxide and sulphur hexafluoride
Version
2026-09
File
https://gml.noaa.gov/webdata/ccgg/trends/ch4/ch4_annmean_gl.csv
Fetched
2026-10-04 (automatically), 2,786 bytes
Fingerprint
sha256 fac1f4e1b0e7f0449f8f496da46509c0c20410ccb368d2462ccb9f22900ef88dETag "ae2-65af9c4fffe44" · Last-Modified Tue, 08 Sep 2026 14:44:18 GMT
Copies
No Wayback copy recorded yet.Our copy of the exact file
Cite the producer
Lan, X., K.W. Thoning, and E.J. Dlugokencky: Trends in globally-averaged CH4, N2O, and SF6 determined from NOAA Global Monitoring Laboratory measurements. Version 2026-09, https://doi.org/10.15138/P8XG-AA10

What was done to it

  1. Read ch4_annmean_gl.csv, created by NOAA on 5 September 2026. The vintage is the year and month of that creation date, which is how NOAA labels its versions.

    Code: pipeline/src/envdash/transforms/air/noaa_ch4_n2o.py · code sha256 10dc38222688b6d5… · inputs fac1f4e1b0e7…

  2. Lower and upper are the mean minus and plus NOAA's stated uncertainty, which the file defines as the standard deviations of 100 bootstrap (network) and 100 Monte Carlo (measurement) global averages taken in quadrature (one standard deviation).

    Code: pipeline/src/envdash/transforms/air/noaa_ch4_n2o.py · code sha256 10dc38222688b6d5… · inputs fac1f4e1b0e7…

  3. The last year is marked preliminary because the file states that the data for the last year are subject to change.

    Code: pipeline/src/envdash/transforms/air/noaa_ch4_n2o.py · code sha256 10dc38222688b6d5… · inputs fac1f4e1b0e7…

What it covers

Geography
Global mean of marine surface sites
Basis
Dry-air mole fraction; NOAA's global average of its marine surface air-sampling network, from smoothed site records weighted by latitude.
Unit
parts per billion (ppb)