AI Overview: YES, the global average surface temperature in 1940 was indeed around 15.10 C (59 F), though exact figures can vary slightly between datasets. This temperature was about 1.3 C above pre-industrial levels (13.80 C) and marked the peak of a warming trend that began in the late 19th century, a trend that was relatively stable until the mid-1970’s before a more significant increase in global temperatures began. AI Overview: NO, the average global temperature in 1940 was not 15.10 C; instead, historical data shows that the global average temperature was around 14.5 C to 14.6 C in the 1940s, with the 15.10 C figure more closely representing a modern year, such as 2024 at 15.20 C.

NASA Temperatures match CRU East Anglia and British Met Office below.

British data and NASA data above are almost identical

AI Overview:   NASA does not record global average temperatures back to 1915 in a way that would allow for the statement that the average temperature was 15 C (59 F) in 1915, as reliable and comprehensive global temperature data began in 1880. While the claim about 1915’s average temperature is unsubstantiated by NASA ? (see graph above), the agency does confirm that the planet’s average surface temperature has risen significantly since 1880.

Misleading Claim: The idea that the global temperature was 15 C in 1915 is a misrepresentation of climate data. In summary, the statement is a factual error; the average global temperature in 1915 was considerably cooler than 15 C .