Not yet but I am a big fan of weather histories, specifically 1600s-1800s. Where did you obtain it?
Yes, I find 30 years to be very arbitrary, I would expand it to 1950 and beyond as that is when most airport stations came "on line." So if you compare the last 60-70 years let's say, you'll be dealing with a similar time frame across most official locations that report weather data..