Crowley and Lowery (2000) still cited quite often purported to show that the MWP was a dog’s breakfast of odds and ends – very different from the Modern Warm Period. The “proof” was the presentation of a hodge podge of proxies, which supposedly did not show a MWP, but did show a Modern Warm Period. Central Colorado” was one of the series, citing an early Lamarche paper.
As noted elsewhere, Crowley lost his collation of original series and couldn’t remember where he got the digital data from (but acknowledges Jones). Crowley’s “Central Colorado” series is very likely a transformation of Lamarche’s original chronology (Crowley used some really OLD versions) – Crowley’s transformation standardizing proxies to a rank range between 0 and 1. Here’s a comparison of our extended Almagre chronology and the smoothed Crowley version (which he did manage to locate). While the two versions track one another more or less, the updated version has reduced values in the mid-20th century and ends at pretty much the long-term median.
In this case, one can argue that the MWP was as elevated as the Modern Warm Period (although a more likely interpretation is that the data is not a thermometer.)