This Idea originally comes from Sydney. Please have a look at https://isithotrightnow.com/ built by Mat Lipson, Steefan Contractor, and James Goldie
Today's maximum temperature so far is 5.0 °C, and the minimum overnight was -3.1 °C. The average of the two is 0.9 °C, which is warmer than 10% of daily average temperatures at LMSS for this time of year over the period 1912 - 2024. The really hot and cold days (top and bottom 5%, respectively) are outside the dotted lines.
We've compared every day this year at LMSS to similar times of year in the past. Red days were warm compared to records; blue days were cold.