The increase in temperature will be calculated:

a) taking NOAA-STAR satellite measurements of the temperature of the lower troposphere (see https://www.star.nesdis.noaa.gov/smcd/emb/mscat/) OR the most similar such data if this dataset is discontinued,

b) calculating the slope and intercept of a least-squares affine fit of this data versus time (from November 1978 to November 2048),

c) using that fit to calculate the change in temperature between 1978 and 2048.

For reference, from Nov 1978 - Mar 2024, the anomaly has been 0.135 K/decade. The time elapsed has been 45.33 years. Multiplying these numbers, the increase to date (at the time of creating this market) is ~0.61 deg C. Therefore, to exceed 1 degree Celsius by 1948, a further increase of ~0.39 is required.