Uploaded February 2019 | Updated September 2026, 1 week ago

---

Every winter, cold snaps cause some to believe they are witnessing evidence against global warming. Such inference from regional to global temperature is an instance of the fallacy of composition. A useful tool to help people reason about this is a Temperature Anomaly map, as seen here, wherein reds reflect above-normal temps and blue-violets below-normal temps.

pivotalweather.com/model.php?rh=2019012918&fh=loop&dpdt=&mc=&r=na&p=850t_anom&m=gfs

The days of the latest polar-vortex cold snap:
youtube.com/watch?v=YxP0-lDN3gQ

Daily Temperature Anomaly
climatereanalyzer.org/wx/DailySummary/#t2anom

Land Surface Temperature Anomaly, Day and 1 Month
neo.sci.gsfc.nasa.gov/view.php?datasetId=MOD_LSTAD_M

Why the Polar Vortex Keeps Breaking out of the Arctic
https://scied.ucar.edu/blog/why-polar-vortex-keeps-breaking-out-arctic

How frigid polar vortex blasts are linked to global warming
theweathernetwork.com/news/articles/how-frigid-polar-vortex-blasts-are-linked-to-global-warming-climate-change-connection-weather-environment/123443

Fallacy of composition
en.wikipedia.org/wiki/Fallacy_of_composition