Olga in the San Juans is an interesting example, just to highlight how remarkably huge an outlier January is. They have records back to 1891, and this is their most recent daily record low in each month January: 1969 February: 2011 March: 2012 April: 2012 May: 2012 June: 2012 July: 2011 August: 2002 September: 2012 October: 2012 November: 2011 December: 2008 Meanwhile 24 of their 31 daily record highs in January have been set since 1969. Slightly misleading? Maybe, surely there have been some big cold airmasses in those 45 years and a couple of record low maximums in that time. Bad luck? Definitely, and luck plays a big part in daily records. But regardless, to me it's just a mindblowing example of the modern changes we've witnessed here.