The answer is 0.

It's hard to believe we've made it through July and August without the thermometer spiking above 100 degrees at least once in Austin at Camp Mabry.

But, it's actually happened 10 different years on record with data going back to 1898.

The answer may also surprise you because it's been quite a long time since Austin has accomplished such a feat.
The last year this happened was 1987.

The other years were 1979, 1975, 1973, 1968, 1919, 1908, 1907, 1906, 1904.

That means four out of the five years from 1904-1908 Austin didn't hit 100° once. Take me back.