An unofficial -64° was measured at Embarrass, Minnesota, on Feb. In addition to the NWS-certified readings above, Peters Sink, Utah measured -69.3° and nearby Middle Sink -61° on February 1, 1985, as part of an ongoing University of Utah research program into cold air drainage in the mountains of northeast Utah. 60° Grayling (Hebgen Dam), Montana, Feb. 65° Fort Keogh (near Miles City), Montana, Jan. 66° Riverside Ranger Station (West Yellowstone, Montana) Feb. 70° (actually -69.7°) Rogers Pass, Montana, Jan. A version of this map appeared in my 2007 book Extreme Weather: A Guide and Record Book. Interestingly, Taylor Park reached -60☏ on the same date in two different years: 19.įigure 1. Only two sites-Maybell, Colorado, and Taylor Park, Colorado-have made the grade twice. Below is a list of the 15 that have achieved such. (circa 1875) only a handful of sites have officially measured temperatures of -60° or lower. Since the beginning of “modern” meteorological observations in the U. The coldest of the cold places: -60☏ or lower Blog reader Scott Patterson, a resident of Colorado, has questioned the validity of this measurement, so I took a close look into the report. I thought it opportune to look at what the coldest temperatures ever observed in the lower 48 states have been, with special attention to the coldest reading of all-the -69.7☏ reported from Rogers Pass, Montana on January 20, 1954. Midwest and Plains in late January and early February, bringing the lowest temperatures observed in almost two decades to many sites from Wisconsin to Montana. Image credit: NWS/Duluth.Ī series of arctic air masses invaded the northern portions of the U.S. The former Cotton COOP site existed from 1962 to 2002. The site is located on low ground near a river, which is a relatively new location for the Cotton COOP instrumentation (since late 2014). They reported that “all of the equipment was in good working order”. The site was also visited by NWS personnel from the Duluth office on the morning of January 31, 2019, to check on the quality of the instruments. The sensor measured a temperature of -56☏ on January 27 and 31, 2019, the coldest readings in the contiguous U.S. Above: Personnel from local and national media outlets check out the official NWS COOP temperature sensor in Cotton, Minnesota.
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