Daily minimum temperature (degrees Celsius) recorded at Grassland Soil and Water Research Center for calendar year 1973. ----------------------------------------------------------------------------------------- Day Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec ----------------------------------------------------------------------------------------- 1 1.1 5.6 6.7 6.7 18.3 21.1 22.8 23.3 22.8 18.9 8.9 7.8 2 1.1 3.3 7.2 7.8 15.0 16.7 22.8 21.1 24.4 21.1 14.4 8.9 3 1.7 -1.1 8.9 8.9 10.0 21.7 22.2 20.0 22.8 22.2 12.8 13.3 4 2.2 1.7 7.8 3.3 11.7 17.8 21.7 20.0 22.8 20.0 16.7 7.8 5 4.4 4.4 7.8 3.3 8.3 23.3 22.2 18.9 20.0 16.7 10.6 2.8 6 0.6 1.1 12.2 8.3 11.1 17.2 20.0 21.1 18.9 19.4 10.6 2.8 7 0.6 8.9 7.2 7.2 15.0 18.3 18.3 22.2 18.3 21.1 15.0 2.2 8 -2.8 -1.7 10.0 7.8 15.6 18.9 22.2 22.2 18.9 18.9 16.1 1.7 9 -5.6 -3.3 14.4 0.6 15.6 18.9 21.1 22.8 22.2 21.1 10.6 4.4 10 -6.1 -6.1 12.8 0.6 15.6 18.9 22.8 22.2 24.4 22.2 9.4 0.6 11 -5.6 -1.1 7.8 5.0 18.9 19.4 22.2 19.4 22.8 17.8 8.3 1.7 12 -11.1 8.3 8.3 8.3 17.8 17.8 23.3 23.3 22.8 17.8 11.7 8.9 13 -6.1 9.4 14.4 14.4 11.1 19.4 20.0 22.8 22.8 17.2 15.0 8.9 14 -4.4 4.4 10.6 15.6 15.6 20.0 21.1 23.9 21.7 18.3 17.2 5.0 15 0.0 0.6 14.4 15.6 8.9 21.1 21.1 18.9 15.6 17.8 13.9 3.9 16 3.3 -1.1 8.9 12.2 10.6 23.3 21.1 21.7 15.6 16.7 9.4 1.1 17 8.3 -1.1 5.0 11.7 11.7 23.9 23.3 21.7 18.3 12.2 10.6 -0.6 18 13.3 1.7 6.7 10.0 15.6 22.8 22.2 21.7 15.6 10.6 18.3 7.2 19 6.7 3.3 10.0 12.2 15.6 22.8 22.8 22.2 15.6 11.7 18.3 -3.3 20 6.7 3.3 7.8 20.0 18.3 18.9 22.8 23.3 21.1 13.3 7.2 -5.0 21 6.7 4.4 6.7 21.1 20.0 20.0 21.7 22.8 20.6 14.4 5.6 -5.6 22 1.7 5.6 8.9 19.4 18.3 19.4 22.2 23.3 20.0 13.3 12.2 -1.1 23 1.1 5.0 12.8 19.4 18.9 21.1 22.8 19.4 22.8 17.2 17.8 8.3 24 -0.6 2.2 14.4 20.0 20.6 21.1 22.8 20.6 22.2 12.8 11.1 6.7 25 4.4 3.3 8.9 16.7 18.3 21.1 22.8 21.7 22.8 17.8 8.9 3.9 26 1.1 10.0 6.7 12.8 16.7 17.2 23.3 22.2 23.9 18.3 13.9 2.2 27 7.8 7.8 8.9 6.7 17.8 18.9 21.7 21.7 20.0 15.6 8.9 0.6 28 1.1 4.4 10.0 8.9 13.9 21.1 21.7 20.0 14.4 9.4 3.9 5.6 29 -5.6 0.0 14.4 8.9 16.7 22.2 22.8 20.0 14.4 8.3 2.8 4.4 30 -3.9 0.0 16.1 15.6 15.6 22.2 23.3 20.0 16.7 12.2 4.4 3.3 31 0.0 0.0 7.8 0.0 15.6 0.0 21.7 20.6 0.0 10.0 0.0 -6.1 ----------------------------------------------------------------------------------------- Max 13.3 10.0 16.1 21.1 20.6 23.9 23.3 23.9 24.4 22.2 18.3 13.3 Min -11.1 -6.1 5.0 0.6 8.3 16.7 18.3 18.9 14.4 8.3 2.8 -6.1 Mean 0.7 3.0 9.8 11.0 15.2 20.2 22.0 21.5 20.2 16.3 11.5 3.3 -----------------------------------------------------------------------------------------