On Friday the average carbon dioxide concentration across the three sites in Brisbane reached 445 ppm, equalling the highest level in the (relatively short) Phase 2 data series, previously attained on 11 June. This average is 29 ppm higher than the well-mixed Southern Ocean air sampled by CSIRO at Kennaook/Cape Grim (latest data is for May).
On the global front, temperature records continue to tumble. Thursday was the 11th consecutive day on which the estimate of global average temperature was greater than any previous day in the 45 year record of the NCEP Climate Forecast System (CFS) version 2 data-set. Today’s third chart shows an even more persistent anomaly – sea surface temperature in the North Atlantic has exceeded all previous values for the corresponding day for each year since 1981. That makes 129 consecutive record high days since 6 March. See more information and other data visualisations at University of Maine,
Daily Averages – Phase 2 (See explanation of differences between Phase 1 and Phase 2 data)
For reference, latest monthly average (May 2023) from CSIRO for Kennaook/Cape Grim in NW Tasmania was 415.7 ppm. (Note – these are provisional values, subject to revision folllowing sensor re-calibrations and other checks.)
| Date | Petrie Terrace | Chapel Hill | Bellbird Park |
| 14-Jul-2023 | 452 ppm | 435 ppm | 448 ppm |
| 13-Jul-2023 | 433 ppm | 431 ppm | 429 ppm |
| 12-Jul-2023 | 437 ppm | 437 ppm | 438 ppm |
| 11-Jul-2023 | 448 ppm | 434 ppm | 438 ppm |
| 10-Jul-2023 | 439 ppm | 424 ppm | 432 ppm |
| 9-Jul-2023 | 423 ppm | 411 ppm | 417 ppm |
| 8-Jul-2023 | 418 ppm | 411 ppm | 414 ppm |
| 7-Jul-2023 | 413 ppm | 407 ppm | 408 ppm |
| 6-Jul-2023 | 434 ppm | 427 ppm | 428 ppm |
| 5-Jul-2023 | 442 ppm | 441 ppm | 429 ppm |
| 4-Jul-2023 | 449 ppm | 443 ppm | 429 ppm |
| 3-Jul-2023 | 428 ppm | 429 ppm | 412 ppm |
| 2-Jul-2023 | 424 ppm | 425 ppm | 414 ppm |
| 1-Jul-2023 | 419 ppm | 407 ppm | 405 ppm |
| 30-Jun-2023 | 414 ppm | 405 ppm | 402 ppm |
| 29-Jun-2023 | 415 ppm | 409 ppm | 405 ppm |
| 28-Jun-2023 | 435 ppm | 427 ppm | 428 ppm |
| 27-Jun-2023 | 426 ppm | 409 ppm | 415 ppm |
| 26-Jun-2023 | 412 ppm | 402 ppm | 412 ppm |
| 25-Jun-2023 | 447 ppm | 426 ppm | 429 ppm |
| 24-Jun-2023 | 427 ppm | 417 ppm | 423 ppm |
| 23-Jun-2023 | 434 ppm | 427 ppm | 435 ppm |
| 22-Jun-2023 | 442 ppm | 425 ppm | 436 ppm |
| 21-Jun-2023 | 443 ppm | 421 ppm | 437 ppm |
| 20-Jun-2023 | 421 ppm | 414 ppm | 417 ppm |
| 19-Jun-2023 | 430 ppm | 418 ppm | 419 ppm |
| 18-Jun-2023 | 436 ppm | 426 ppm | 434 ppm |
| 17-Jun-2023 | 440 ppm | 429 ppm | 437 ppm |
| 16-Jun-2023 | 438 ppm | 421 ppm | 433 ppm |
| 15-Jun-2023 | 433 ppm | 412 ppm | 428 ppm |
| 14-Jun-2023 | 435 ppm | 425 ppm | 438 ppm |
| 13-Jun-2023 | 441 ppm | 436 ppm | 442 ppm |
| 12-Jun-2023 | 442 ppm | 439 ppm | 448ppm |
| 11-Jun-2023 | 443 ppm | 441 ppm | 451 ppm |
| 10-Jun-2023 | 446 ppm | 432 ppm | 444 ppm |
| 9-Jun-2023 | 441 ppm | 428 ppm | 440ppm |