My feeling is that these effects are all much smaller than the site move or time of observation biases that are being corrected for. (realclimate.org)
«There is practically no time of observation bias in urban - based stations which have taken their measurements punctually always at the same time, while in the rural stations the times of observation have changed. (skepticalscience.com)
is that the impression the Jays have a long term trend of under performing bad teams is simply observation bias rather than actually having merit. (sbnation.com)