Data is latest version of Gisstemp LOTI (land ocean temperature index). This is currently at

https://data.giss.nasa.gov/gistemp/tabledata_v4/GLB.Ts+dSST.txt

or

https://data.giss.nasa.gov/gistemp/tabledata_v4/GLB.Ts+dSST.csv

if you prefer csv file.

January to May 2023 were not hottest for those months but June 2023 was. So it may seem that 7*14=98 is the highest possible value. However it is not impossible that the numbers get revised so theoretically possible for it to be 8 months or more in which case the maximum will be capped at 100% because cannot resolve at more than that.