Google stopped issuing regular public updates to PR years ago, so any information you find is highly unlikely to be reliable. See this post from Google, made in October 2009 :
We’ve been telling people for a long time that they shouldn’t focus on PageRank so much; many site owners seem to think it’s the most important metric for them to track, which is simply not true. We removed it because we felt it was silly to tell people not to think about it, but then to show them the data, implying that they should look at it.
More details on why not to obsess over PageRank here:http://sites.google.com/site/webmasterhelpforum/en/faq--crawling--indexing---ranking#pagerank
https://productforums.google.com/forum/?hl=en#!category-topic/webmasters/webmaster-tools/29GtmYDt8L0
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