Table 1.

Average precipitation, post-seeding air temperature extremes and cumulative freezing events for each location x year.

Location	Latitude/longitude	Agroecological region	Soil zone	Average yearly precipitation† (mm)	Year	Actual precipitation (mm)	Earliest seeding date‡	Number of days with air temperature below 0°C after initial seeding date	Lowest air temperature recorded after seeding (°C)
Dawson Creek, BC	55°48'N 120°14'W	Parkland	Gray wooded	453	2015	325	April 16	12	−5.0
					2016	542	April 21	11	−6.1
Edmonton, AB	53°33'N 113°29'W	Parkland	Black	446	2015	299	April 9	12	−4.2
					2016	510	March 29	11	−3.6
					2017	416	May 5	0	2.3
Lethbridge, AB	49°41'N 112°50'W	Western Prairies	Dark brown	380	2015	251	March 6	37	−6.7
					2016	338	February 16	36	−10.2
					2017	249	March 20	17	−7.6
					2018	284	April 23	2	−1.2
Regina, SK	50°26'N 104°35'W	Western Prairies	Dark brown	397	2015	347	April 21	11	−5.0
Scott, SK	52°21'N 108°49'W	Western Prairies	Dark brown	366	2016	415	April 2	21	−9.8
					2017	300	March 31	27	−9.4
Swift Current, SK	50°18'N 107°46'W	Western Prairies	Brown	357	2015	304	April 10	23	−6.4

† 1981–2010 average yearly precipitation accumulation. ‡ Based on 0°C soil temperature trigger date.