Table 1.

Geographic and climatic characteristics of the study ecoregions of North Asia.

Ecological Region	Area Coordinates	Climate (Group D) #	Altitude, m	Average Temperature (°C)			Average Annual Precipitation, mm	Frost-Free Period (Days)	Σt, Degree Days *
				Annual	In January	In July
Southern taiga (boreal forest)	from 57°00′00″–59°50′00″ to 82°39′00″–92°08′00″	Subarctic climate	60–130	−0.9–(−2.0)	−19.8–(−21.6)	17.9–18.3	250–500	90–120	1472–1820
Sub-taiga zone	from 56°15′00″–56°48′21″ to 83°58′00″–86°42′00″	Subarctic climates	90–120	−0.6	−19.2	18.1	350–550	100–120	1650–1800
Forest steppe	from 51°00′00″–55°19′59″ to 81°28′00″–85°30′00″	Warm summer continental climate	200–250	2.1–2.6	−16–(−19)	18–20	350–450	120–123	1900–2100
Mountain taiga forests	from 48°34′03″–53°45′00″ to 82°18′25″–87°07′00″	Warm summer continental climate	290–1685	0.3–2.4	−12.6–(−24.0)	17–22	500–900	123–135	2200–2400

^# Köppen climate classification was used. * Degree days are a specialist kind of weather data, calculated from readings of outside air temperature.