July 31 is not the hottest day of the year throughout the northern hemisphere. The day of the year with the highest average temperature for each location depends not only on the time of the year but also on nearby terrain and prevailing weather patterns.
the hottest day in 1929 was 97 degrees on July 23rd
July 10 1936
July 31 1958 was a Thursday
July 31 1951 was a Tuesday.
The hottest day in Needles, California was on July 13, 1913 when the temperature reached 125°F (52°C).
July 31 1996 was on a Wednesday.
July 31 1970 was on a Friday.
July 31, 2002 was a Wednesday.
July 31 1967 was a Monday.
July 31 1959 was a Friday.
July 31 2010 was a Saturday.
July 31 1951 was a Tuesday.