We were in San Antonio in early Mar of 2014. San Antonio was on the way to Death Valley NP which was a major "to do" on my cross country trip.
When we entered Texas the day before on I-20, we broke out our t-shirts and shorts, because we had finally gotten to some warm weather.
After dropping the TT at the RV park, we took the bus to down town just to look around a little. A cold front came through while on the bus to down town. It got down in the upper thirties. All I had on was a thin nylon jacket, with no lining, a short sleeve t-shirt and shorts. I was freezing.
After getting back to the TT, we changed clothes and took the dog for a walk. Got hit with a lightening and hall storm. That night the water hose froze solid. Fortunately not plumbing was damaged.
To top it off, the next day the temperature was still low. So low, no one was at the River Walk and boat rides had been suspended for the day due to "inclement" weather. No rain or wind, just cold.
Temperatures didn't moderate until we moved on to Fredricksburg, TX.