First, Ari Jokimäki's new analysis of the Tljander proxies, particularly XRD, X-Ray Density. His post at AGW Observer is Tiljander.
Second, here is a link to the Excel file Kort-gridbox-CRUtemv3.xls, which contains monthly and annual
Note that the file contains two graphs of temperature anomaly vs. time for that gridcell. Here is the first: annual aveage temperature anomaly vs. time, along with the line generated by Excel's linear regression tool.
The second graph adds the Tiljander X-Ray Density (XRD) proxy, using an 11-year rolling average. Note that the XRD proxy is plotted in its "upside-down" orientation. In other words, by the assignment of Tiljander et al. given in their 2003 Boreas article, "colder" is towards the top of the graph, while "warmer" is towards the bottom.
However, climactic influences on the XRD proxy are of limited relevance with respect to these 19th and 20th Century values, according to Tiljander et al. The XRD record during this time is dominated by local non-climate-related contaminating factors. For details, refer to the "Jarvykortta River" post.
The screening, validation, and calibration exercises in Mann08 relied on two instrumental surface-air temperature data sets for 1850-2006, maintained by the University of East Anglia's Climatic Research Unit instrumental surface-air temperature data from 1850 to 2006. CRU's records are archived at this page. "CRUTEM3v" estimates land temperature anomalies; "HadCRUT3v" estimates them for land and ocean combined. "v" refers to the adjustment by CRU of the anomaly values for variance.
The 5-degree by 5-degree gridbox that includes the Lake Korttajarvi bore hole site encompasses 60N to 65N in latitude and 25E to 30E in longitude. I pulled the monthly temperature anomaly values for that gridcell from a download of the CRUTEM3v file, per instructions on the linked page. For each year, the values for months 1 to 12 were averaged to create an annual average. These yearly values are what are graphed above.
Mann08 divided the 1850-1995 instrumental record into two calibration/validation intervals. Page 15253/4:
We evaluated the fidelity of reconstructions through validation experiments (see Methods), focusing here on NH land temperature reconstructions... The CPS and EIV methods... are both observed to yield reconstructions that, in general, agree with the withheld segment of the instrumental record within estimated uncertainties based on both the early (1850–1949) calibration/late (1950–1995) validation and late (1896–1995) calibration/early (1850–1895) validation.