Returning the First Temperature in PowerPivot

Here in Southeast Texas, it has been rather cool this year. In fact, as of this writing (May 25), there has not been a day yet at 90°F or above. I thought that this was pretty unusual, but I could not (easily) find a temperature dataset on the Internet to prove it. However, I thought that I had such a dataset stored away somewhere in my computer, but I could not find it (due to poor file naming) until this weekend. It was missing a few years of data in the middle of the dataset, but I had enough to test out my theory After I loaded the data into PowerPivot, it was pretty easy to come up with a DAX measure that would give me the first day of the year at 90°F or above.