Daily minimum temperature (degrees Celsius) recorded at Grassland Soil and Water Research Center for calendar year 1957. ----------------------------------------------------------------------------------------- Day Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec ----------------------------------------------------------------------------------------- 1 5.6 10.0 7.2 8.3 17.8 20.0 21.7 25.0 21.7 11.7 17.2 -1.7 2 6.7 3.9 9.4 17.8 17.2 16.7 24.4 25.0 24.4 12.8 17.8 1.7 3 7.2 7.2 9.4 17.2 16.7 18.3 22.2 23.9 20.0 13.9 10.6 9.4 4 15.0 16.1 9.4 10.0 14.4 18.3 21.1 23.3 20.0 15.6 11.7 1.7 5 8.3 10.0 6.7 6.1 8.9 18.3 22.2 25.0 20.0 17.2 12.8 1.7 6 8.3 10.6 5.6 6.7 9.4 18.9 23.9 22.2 21.1 15.6 10.6 12.8 7 5.6 12.8 1.7 15.6 12.2 20.0 23.3 18.9 17.2 15.6 11.7 5.6 8 15.0 17.2 -2.8 6.7 16.1 21.1 22.8 21.7 12.8 16.7 7.8 5.6 9 17.8 15.0 5.0 4.4 15.6 21.1 22.8 21.7 13.9 16.7 3.3 -0.6 10 0.6 13.3 13.9 7.8 15.6 23.3 22.2 24.4 14.4 13.9 5.6 3.3 11 -1.1 12.2 13.9 14.4 18.3 23.9 22.8 22.2 17.2 10.6 5.6 -4.4 12 6.7 16.1 12.2 6.1 18.9 18.9 23.3 23.9 17.8 11.1 7.8 -6.7 13 7.2 13.9 12.2 1.1 16.7 19.4 23.3 23.9 18.3 16.1 12.2 2.2 14 2.2 15.0 12.2 4.4 15.0 23.9 23.9 23.9 20.0 13.9 7.2 11.1 15 -0.6 16.1 5.0 11.7 20.6 23.3 22.2 23.9 20.0 13.9 11.7 12.2 16 -2.8 7.8 8.9 15.0 21.1 22.8 22.2 23.9 16.7 14.4 13.3 15.0 17 -7.8 7.2 14.4 16.1 20.0 22.8 22.8 23.9 17.8 15.6 17.8 14.4 18 -5.0 6.1 10.0 25.6 16.1 21.7 22.8 25.0 18.3 12.8 8.9 16.7 19 1.7 7.2 6.7 16.1 14.4 20.6 23.3 22.2 18.3 9.4 2.8 16.7 20 9.4 6.7 11.7 18.3 17.2 21.1 24.4 20.0 20.6 7.8 7.2 2.8 21 15.0 1.7 11.1 16.1 23.3 21.1 23.9 21.7 24.4 11.7 6.1 3.3 22 12.2 8.9 8.3 16.1 23.9 22.8 25.0 21.1 17.8 17.2 1.1 4.4 23 -1.7 4.4 4.4 14.4 20.0 22.8 23.3 22.2 15.0 15.0 0.0 14.4 24 0.0 6.1 6.1 16.7 18.3 20.0 23.3 22.2 13.9 11.1 0.0 11.1 25 3.9 11.7 7.2 17.2 22.8 18.3 22.8 22.2 15.0 9.4 1.1 11.1 26 -1.1 8.9 -0.6 16.7 19.4 19.4 23.3 23.3 15.6 2.2 4.4 4.4 27 -0.6 3.3 7.2 14.4 20.0 22.2 22.8 22.2 15.6 1.1 7.8 7.2 28 0.0 2.8 6.1 16.7 18.3 22.2 23.3 21.7 15.6 1.1 5.0 2.2 29 5.0 0.0 6.1 15.6 20.0 23.9 23.3 21.7 13.3 6.7 2.8 2.2 30 1.1 0.0 10.0 16.1 19.4 25.0 23.3 20.6 11.7 12.2 -1.1 7.8 31 5.0 0.0 11.7 0.0 20.0 0.0 25.0 20.0 0.0 12.8 0.0 6.1 ----------------------------------------------------------------------------------------- Max 17.8 17.2 14.4 25.6 23.9 25.0 25.0 25.0 24.4 17.2 17.8 16.7 Min -7.8 1.7 -2.8 1.1 8.9 16.7 21.1 18.9 11.7 1.1 -1.1 -6.7 Mean 4.5 9.7 8.1 13.0 17.7 21.1 23.1 22.7 17.6 12.1 7.7 6.3 -----------------------------------------------------------------------------------------