On January 26, 1950 the US had a temperature range of 153 degrees. It was 96F at Rio Grande City, Texas and -57F at Chester, Montana. The coldest temperature in Texas was 4F, so that state had a spread of 92 degrees. Fourteen states were over 80 degrees and twenty-three states were over 70 degrees.
26 Jan 1950, 8 – Intelligencer Journal at Newspapers.com
TX 96 FL 86 MS 85 GA 85 LA 84 AR 83 AL 83 SC 83 NC 81 OK 80 KY 80 PA 80 WV 80 VA 80 TN 79 MD 79 IN 78 OH 77 NJ 76 DE 76 MO 75 IL 74 NY 74 MA 69 CT 69 MI 67 ME 64 NH 64 AZ 63 CA 63 RI 63 NM 62 High Low Range TX 96 4 92 MT 34 -57 91 MI 67 -18 85 MO 75 -9 84 IN 78 -3 81 OK 80 1 79 AZ 63 -13 76 UT 49 -25 74 CO 45 -28 73 AR 83 11 72 IL 74 2 72 NM 62 -8 70 CA 63 -3 66 NV 48 -17 65 WY 39 -26 65 SD 32 -32 64 NE 32 -31 63 WA 39 -23 62 WI 38 -22 60 KS 32 -27 59 IA 32 -24 56 OH 77 23 54 OR 49 -4 53 MN 17 -34 51 ID 34 -16 50 KY 80 30 50 ME 64 14 50 PA 80 30 50