Weather station data was retrieved from NCEI: https://www.ncei.noaa.gov/pub/data/ghcn/daily

The weather station data for Hoseda Hard was extracted and modified such that only data from the All-Russian Research Institute of Hydrometeorological Information was included. Any data with a questionable quality flag was removed completely.

Ring width data is from the International Tree Ring Database (NOAA): site id = russ208. Reference: Forbes, B.C., M. Macias Fauria, and P. Zetterberg. 2010. Russian Arctic warming and 'greening' are closely tracked by tundra shrub willows. Global Change Biology 16: 1542-1554. DOI: 10.1111/j.1365-2486.2009.02047.x.