This #Halloween2021, lets look back at the global temperature record for past Octobers.

Note how much warming has happened in about 100 years, since the first official citywide Halloween celebration in the U.S. (in Anoka, Minn.) in 1921.

👉 By the way, in the natural sciences, the word "anomaly" (as seen in the graphic) refers to a measurement that is different from an expected trend or a model prediction.

In this case, the plot's data points are compared with data from 1951 to 1980, which is NASA's reference baseline.

Source : NASA