U.S. heat over the past 12 months: a one in half-a-million event

[KurtNYC]

1. How can three 12-month periods occur after April 2011?

Last edited Tue Jun 12, 2012, 04:43 PM - Edit history (1)

Figure 2 caption: Three of the top ten warmest 12-month periods in the contiguous U.S. since 1895 have occurred since April 2011

ETA: I think I get it now -- they are comparing the prior 12 months to all 12 month periods on record. So monthly, as the data is finalized it just rolls. The 12 month data periods they cite successively overlap each other by all but one month and for example, at the end of this month they will generate this again with June 2012 data but June 2011 data will fall out of the sample. Eh?