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Daily mean temperature 1.5C higher here

Letter

It is gratifying to see that Niwa has confirmed the warming trend I wrote about a few days ago (Jan 8 letter).

Of further interest to those following climate matters, Gisborne's daily mean temperature for last year of 15.1 degrees is warmer than the figure for all of New Zealand by 1.5 degrees.

Niwa says the nationwide daily temperature averaged 13.56 degrees in 2021 (this is the day-time highs and night-time lows averaged over the whole year).

My calculations using the national climate database show Gisborne's temperatures rising steadily since the first intermittent records began in 1905. The pattern is clear in what are called the 30-year “normals” — data averaged over each 30-year period.

Gisborne's weather data from the airport shows the daily mean temperature for 1941-1970 was 13.5 degrees — almost the same as the 2021 daily mean for New Zealand — so the district has consistently been warmer than the national average.

For the 30-year period 1981-2010, Gisborne's daily mean had risen to 14.5 degrees. The climate scientists at Niwa are still working on a new set of “normals” for 1991-2020. When this comes out it will undoubtedly show a continuing warming trend, especially as the past decade has seen some of the warmest years on record, both nationally and in the Gisborne region.

Roger Handford

  1. Bob Hughes says:

    Thanks, Roger
    What I find scarier is the accelerating atmospheric CO2 readings
    Mauna-loa Observatory
    Jan. 13, 2022 418.93 ppm
    Jan. 13, 2021, 414.99 ppm
    1 Year Change 3.94 ppm (0.95%)
    And we know from records that as CO2 levels go up, the heat will follow.

    1. Bob Hughes says:

      and the following day Jan. 14, 2022 = 419.08 ppm compared to
      Jan. 14, 2021 = 415.08 ppm a 1 year change of 4.00 ppm

      1. Bob Hughes says:

        Previous comments compressed
        Thanks, Roger
        What I find scarier is the accelerating atmospheric CO2 readings
        Mauna Loa Observatory, Hawaii.
        Jan. 14, 2022 = 419.08 ppm
        Jan. 14, 2021 = 415.08 ppm
        a 1 year change of 4.00 ppm
        And we know from records that as CO2 levels go up, the heat will follow.