Nope, that actually also surprised me, and I'm not disputing that my card would also probably drop equally low at times, but those momentary drops are often not noticable. If they're apparent enough for you to notice them or affect gameplay then they're bad enough to have a markable impact on the average. In my opinion though, it's the average that determines the general performance - so whilst it's always nice to have as high a minimum as possible, it's not an indication of how your system performs.
But bare in mind, that the benchmark you pasted above is an average score, so its max fps would likely be 36-38fps @ 1680x1050 - still it seems my card performed well, probably due to newer drivers.