September 2023 was the warmest September on record by a staggering margin of 0.5 degrees Centigrade – 33 degrees Fahrenheit. It was also 3.28 degrees Fahrenheit warmer than the 1850-1900 preindustrial average. It set the record for the largest monthly temperature anomaly ever recorded. This is the 14th time in the Berkeley Earth analysis that any individual month has reached at least 2.7 degrees warmer than the preindustrial benchmark. This also previously occurred in March, July and August of 2023.
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