I am comparing the climates of a handful of cities and I would like to find the average of all recorded yearly high and low temperatures, but all I'm able to find is the average of all monthly averages.
For example, if I look at climate data for Portland Oregon, it tells me that the average high temperature for the month of July is 81(F), but I know that the temperature regularly climbs into the 90s in the month of July (occasionally into the 100s). I know that for 2015 the highest recorded temperature in Portland was around 104(F), 2014 was 98(F) and 2013 was 93(F), which for this small sample would put the average annual high temperature at around 98(F).
Where can I find this type of information?