Recorded global surface temperatures have risen steadily over the past decades (NASA Earth Observatory). The question will be suspended on 30 September 2023 if still open and the outcome determined using data published by NOAA (NOAA - Global Anomalies and Index Data, click "Download" for all data with the site's default settings [Monthly, Global, Land and Ocean, and CSV]). The highest anomaly, or the difference between a given time period as compared to the 20th century average, on record was 1.31°C in March 2016 as of the launch of this question.

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