The six charts below illustrate daily air temperature anomalies at 2 meters above the surface over the past 85 years, relative to the baseline y(x) = 0, which represents the average for the period from 1940 to 2022. The data includes various regions: the overall global average, the Tropics, the Northern and Southern hemispheres, as well as the Arctic and Antarctic. Notably, the baseline already incorporates a significant increase in 2‑meter air temperature, encompassing the average of the past 83 years. As a result, for instance, the global average temperature anomaly for the year 2023 shown here is approximately only 1.0 degrees Celsius, whereas it is 1.5 degrees Celsius relative to the year 1850. Hence, to obtain the commonly used value for Global Warming, i.e. related to the pre-industrial reference period, about 0.5 degrees Celsius must therefore be added to the y‑values in first the diagram.
The global air temperature anomaly averaged over the current year 2024 for the reference period 1850–1900 is calculated daily and displayed in red in the left-hand diagram. This is also an exclusive calculation from primary data. The calculation steps essentially comprise: (1) Determination of the difference between the average temperature anomalies of the years 2024 (beginning of the year to the current day) and 2022 and the baseline 1940–2022, (2) addition of the temperature anomaly of the year 2022 to the reference period 1850–1900 (1.16 °C).