Quite possible. If the mean is around 0.1-0.5, then only a couple of members will be showing PPN.
On the other hand, it could be showing that quite a few runs have cloud, but only a few produce very light and patchy rain. 2m temps don't seem to back up the second scenario though. Mean 2m temperature for 18th is just below 30, which doesn't suggest many cloudy runs.