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  • Home
  • About Rapidcooling.net
    • Your Personal Data
    • Privacy Policy
    • Disclaimer
  • Contact Us
  • Science & Data
    • Monthly Average Mauana Loa CO2 DATA
    • GCW snow watch project
    • UAH Satellite Data
  • Climate v. Humanity
  • A Thing Of The Past
  • The Sun Drives Climate
  • Holy Hail
  • Opinions & Commentary
  • Other Science News
  • The Real Agenda
  • Cartoons & Humor
  • Blog Etiquette
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NOAA, Global Monitoring Laboratory; Earth System Research Laboratory; Monthly Average Mauna Loa CO2

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The Numerical Value is a measurement in Parts Per Million. (PPM) The Observe Value of 429.35 PPM is for the Month of February 2026.

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The Numerical Value is a measurement in Parts Per Million. (PPM) The Observed Value of 427.09 PPM for the Month of February 2025

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The Year To Date Departure is The Numerical Value in Parts Per Million between the Historical Value of a given month and The Current Observed Value One 12 Months or 1 Year later. In this case the Difference Between February of 2025 (Start Point) and February of 2026 (End Point); Atmospheric CO2 increased over this period of time by a value 2.26. However, the amount of the Increase in CO2 does not illustrate what impact an increase in CO2 has had or will have on the Climate System over a 12 Month Period Time or Longer. One should also not Imply the effect an increase or decrease in CO2 has on the Climate System based on relatively short periods of time. Correlation is not Causation.

As Per NOAA; "The estimated uncertainty in the annual mean is the standard deviation # of the differences of annual mean values determined independently by # NOAA/ESRL and the Scripps Institution of Oceanography." For a complete analysis of the annual mean DATA click this link below; 
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fThis Graph Represents the annual mean Carbon Dioxide growth rates at The Mauna Loa Observatory since 1959. Decadal Averages of growth rate are shown as Horizontal Black Lines and begin with 1960. For Example the first plotted horizontal line runs from 1960 through 1969.

Please note that neither The Rapid Cooling web site/blog nor 40 North Latitude are affiliated with either The Mauna Loa Observatory or NOAA. All Graphs, Charts, DATA, DATA Sets, the Reposting of Articles and it's Contents and Quotes above or below are for Informational and Educational Purposes only. Please draw your own Conclusions. Neither Rapid Cooling or 40 North Latitude are responsible for DATA Contained within any Dataset. If you feel that DATA contained within a respective Dataset is incorrect please dispute your concerns with it's Author.

For more information, please click the following link;   https://gml.noaa.gov/ccgg/trends/gr.html                                               From there you can access other DATA which may or may not be posted at Rapid Cooling. 
Historical CO2 DATA for 2026. Last Update Tuesday, March 10, 2026
Month/Year Monthly Average PPM Previous Year PPM YTD Increase PPM 10 Year Increase
in PPM
20 Year Increase
in PPM
30 Year Increase
inPPM
December 2026 N/A N/A N/A N/A N/A N/A
November 2026 N/A N/A N/A N/A N/A N/A
October 2026 N/A N/A N/A N/A N/A N/A
September 2026 N/A N/A N/A N/A N/A N/A
August 2026 N/A N/A N/A N/A N/A N/A
July 2026 N/A N/A N/A N/A N/A N/A
June 2026 N/A N/A N/A N/A N/A N/A
May 2026 N/A N/A N/A N/A N/A N/A
April 2026 N/A N/A N/A N/A N/A N/A
March N/A N/A N/A N/A N/A N/A
February 2026 429.35 (0.73) 427.09 002.26 404.25 (25.1) 382.40 (49.95) 363.36 (65.99)
January 2026 428.62 (1.13) 426.65 001.97 402.73 (25.89) 381.58 (47.04) 362.20 (66.42)
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Historical CO2 DATA for 2025. Last updated Tuesday March 31, 2026
Month/Year Monthly Average PPM Previous Year PPM YTD Increase
in PPM
10 Year Increase
in PPM
20 Year Increase
in PPM
30 Year Increase
in PPM
December 2025 427.49 (1.03) 425.40 2.09 402.06 (25.43) 380.31 (47.18) 360.82 (66.67)
November 2025 426.46 (1.59) 423.85 2.61 400.27 (26.19) 378.54 (47.92) 359.61 (66.85)
October 2025 424.87 (0.50) 422.38 2.49 398.49 (26.38) 377.19 (47.68) 358.14 (66.73)
September 2025 424.37 (1.11) 422.03 2.34 397.82 (26.55) 376.89 (47.48) 358.32 (66.05)
August 2025 425.48 (2.39) 422.99 2.49 399.11 (26.37) 378.93 (46.55) 359.33 (66.15)
July 2025 427.87 (1.74) 425.55 2.32 401.46 (26.41) 380.93 (46.94) 359.51 (68.36)
June 2025 429.61 (0.90) 426.91 2.7 402.97 (26.64) 382.40 (47.21) 363.33 (66.28)
May 2025 430.51 (0.87) 426.90 3.61 404.15 (26.36) 382.64 (47.87) 363.83 (66.68)
April 2025 429.64 (1.49) 426.51 3.13 403.35 (26.29) 382.48 (47.16) 363.44 (66.20)
March 2025 428.15 (1.06) 425.38 2.77 401.74 (26.41) 380.95 (47.20) 361.98 (66.17)
February 2025 427.09 (0.44) 424.55 2.54 400.55 (26.54) 379.91 (47.18) 361.00 (66.09)
January 2025 426.65 (1.25) 422.80 3.85 400.18 (26.47) 378.63 (48.02) 360.04 (66.61)
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Historical CO2 DATA for 2024
Month/Year Monthly Average PPM Previous Year PPM YTD Increase PPM 10 Year Increase PPM 20 Year Increase PPM 30 Year Increase PPM
December 2024 425.40 N/A N/A N/A N/A N/A
November 2024 N/A N/A N/A N/A N/A N/A
October 2024 N/A N/A N/A N/A N/A N/A
September 2024 N/A N/A N/A N/A N/A N/A
August 2024 N/A N/A N/A N/A N/A N/A
July 2024 N/A N/A N/A N/A N/A N/A
June 2024 N/A N/A N/A N/A N/A N/A
May 2024 N/A N/A N/A N/A N/A N/A
April 2024 N/A N/A N/A N/A N/A N/A
March 2024 N/A N/A N/A N/A N/A N/A
February 2024 N/A N/A N/A N/A N/A N/A
January 2024 N/A N/A N/A N/A N/A N/A
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Historical CO2 DATA for 2023
Month/Year Monthly Average PPM Previous Year PPM YTD Increase PPM 10 Year Increase PPM 20 Year Increase PPM 30 Year Increase PPM
December 2023 N/A N/A N/A N/A N/A N/A
November 2023 N/A N/A N/A N/A N/A N/A
October 2023 N/A N/A N/A N/A N/A N/A
September 2023 N/A N/A N/A N/A N/A N/A
August 2023 N/A N/A N/A N/A N/A N/A
July 2023 N/A N/A N/A N/A N/A N/A
June 202 N/A N/A N/A N/A N/A N/A
May 2023 N/A N/A N/A N/A N/A N/A
April 2023 N/A N/A N/A N/A N/A N/A
March 2023 N/A N/A N/A N/A N/A N/A
February 2023 N/A N/A N/A N/A N/A N/A
January 2023 N/A N/A N/A N/A N/A N/A
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