Even though I don't expect there would have been nearly as many high quality stations in the world at that time. (variable-variability.blogspot.ru)
The Santa Rosa, California station is a Bad quality station (Rating 5). (globalwarmingsolved.com)
But, even if we assume that the Intermediate quality stations are relatively unaffected (as Muller et al., 2011 did), that only counts for an extra 22 %. (globalwarmingsolved.com)