The US has had some very hot July 20ths in the past, with the three hottest being 1934, 1901 and 1930.
July 20 1934
MO 116, NE 116, SD 115, AZ 114, IL 113, IA 112, KS 112, ND 112, OK 111
CO 109, MT 109, IN 108, AR 107, CA 107, TX 107, ID 106, NM 106, KY 105, MI 105, OH 105, WY 103, GA 102, LA 102, MS 102, PA 101, SC 101, UT 101, VA 101, AL 100, MN 100, TN 100, WV 100
NV 99, WI 99, NY 98, NC 98, FL 97, DE 95, MD 95, OR 95, NJ 94, VT 93, CT 92, NH 90, WA 90
20 Jul 1934, Page 1 – The Portsmouth Herald at Newspapers.com
July 20 1930
AZ 110, NE 110
OH 109, VA 109, IL 108, CA 107, KS 107, KY 106, MD 106, AR 105, IN 105, MI 105, MO 105, OK 105, IA 104, TX 104, WV 104, WI 104, MS 103, NV 103, DE 102, PA 102, TN 102, CO 101, NC 101, SD 101, GA 100, LA 100
AL 99, NM 99, UT 99, NJ 98, SC 98, MN 97, CT 95, FL 95, ID 95, NY 95, WA 95, OR 94, ND 90
20 Jul 1930, 1 – Henryetta Daily Free-Lance at Newspapers.com
July 20 1901
UT 112, AZ 110
AR 109, MO 109, NE 109, SD 109, CA 108, IL 107, IA 107, KS 107, MN 107, OK 107, WI 106, TX 105, WY 105, IN 104, ID 103, KY 103, NV 102, CO 101, TN 101
MS 99, MT 99, OH 99, LA 98, MI 98, ND 98, VA 98, NM 97, AL 96, GA 96, OR 95, PA 94, SC 94, WV 94, FL 93, NY 93, MD 91, NJ 91, DE 90, NC 90, WA 90
21 Jul 1901, Page 5 – The Topeka Daily Capital at Newspapers.com
20 Jul 1901, 3 – The Western Times at Newspapers.com
July 20, 1936
AZ 116, CA 114, OK 113, ID 112, TX 111
AR 109, KS 109, UT 108, CO 107, OR 107, SD 107, WA 107, NV 106, MO 105, MT 104, NE 104, MN 103, WY 103, NM 102
MS 99, NC 99, ND 99, VA 99, IL 98, IA 97, LA 97, GA 96, OH 96, TN 96, FL 95, SC 95, IN 94, KY 94, WV 94, AL 92, PA 91, WI 90
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The Huntsville Times (Huntsville, Alabama) – 21 Jul 1936,
“Record Heat
There has been no heat wave in the history of this country that has been comparable, in the number of fatalities, to that which has burned and blistered more than a scores of states since July 1.
Yesterday, the number of those who has perished as a result of it passed the 4,500 mark.
Some of these include drownings. But the very large majority of the deaths were due directly to the insufferable heat, mostly in a period of 15 days, when temperatures of 110 and more were very common.”