Daily minimum temperature (degrees Celsius) recorded at Grassland Soil and Water Research Center for calendar year 1939. ----------------------------------------------------------------------------------------- Day Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec ----------------------------------------------------------------------------------------- 1 2.2 15.6 3.9 10.6 13.3 18.3 21.1 21.7 22.2 10.6 8.3 6.1 2 3.9 3.3 -1.1 15.0 16.1 17.8 22.2 20.6 22.8 9.4 10.6 6.7 3 10.6 0.0 1.7 18.3 16.7 20.6 23.9 23.3 23.3 13.9 5.6 4.4 4 12.2 -2.8 12.2 16.7 16.1 20.6 23.3 23.9 22.2 19.4 6.1 4.4 5 5.6 5.0 14.4 18.9 13.9 20.6 22.2 22.2 22.2 21.7 3.3 6.1 6 3.3 6.7 7.2 7.2 15.0 20.6 19.4 20.6 21.1 22.2 5.6 5.6 7 9.4 3.9 6.7 3.9 18.9 18.3 20.0 23.9 21.1 20.6 12.8 6.7 8 14.4 6.1 7.2 2.2 15.0 19.4 22.8 24.4 20.6 20.0 12.2 6.1 9 10.6 14.4 16.1 10.0 15.0 20.6 24.4 22.2 20.6 22.8 11.7 6.1 10 7.8 5.0 17.8 16.7 15.0 22.8 23.3 19.4 20.6 15.6 11.7 8.9 11 7.2 -4.4 17.2 13.9 19.4 22.2 22.8 21.7 18.3 12.2 6.7 7.2 12 5.6 0.6 9.4 6.7 17.8 22.8 21.7 22.2 21.1 13.9 6.7 13.3 13 2.8 2.8 2.8 13.9 17.8 21.7 20.6 23.9 22.2 14.4 6.7 5.0 14 4.4 12.2 8.9 18.3 16.1 20.6 21.7 21.7 20.6 11.7 8.3 1.1 15 3.3 1.1 6.1 20.6 16.1 21.7 23.3 22.2 20.6 8.9 10.6 9.4 16 -2.8 3.9 1.7 13.9 16.1 20.0 21.7 22.2 23.3 10.0 10.6 4.4 17 7.2 0.0 5.0 9.4 16.1 23.9 20.6 22.2 21.1 12.8 12.8 7.8 18 -1.1 1.1 8.3 5.6 17.8 25.0 22.8 22.2 20.0 11.7 13.3 10.0 19 0.0 7.2 7.2 6.1 18.3 19.4 21.7 22.8 20.6 11.7 7.8 8.9 20 2.8 1.7 9.4 10.0 18.9 22.2 22.2 21.7 21.7 14.4 6.7 -2.2 21 6.1 -5.6 11.7 9.4 19.4 22.8 22.2 19.4 17.2 15.0 4.4 2.8 22 6.1 -6.1 11.1 10.0 20.6 22.2 21.7 21.1 16.1 15.6 7.2 15.0 23 3.3 -2.2 10.6 11.7 21.7 21.1 21.7 22.2 16.7 13.9 8.3 12.2 24 3.9 9.4 15.6 14.4 20.0 21.1 22.8 21.1 18.3 20.0 8.3 -0.6 25 3.9 3.3 11.7 13.9 20.0 21.7 22.2 22.2 17.2 20.0 7.2 2.2 26 6.1 -1.7 12.8 17.8 18.9 21.7 23.3 21.1 16.7 22.8 2.2 3.3 27 1.7 5.6 14.4 16.7 20.6 21.7 22.2 20.0 17.8 23.3 6.7 -3.9 28 3.3 0.0 17.2 15.6 20.6 22.2 23.3 19.4 21.1 10.6 2.8 -0.6 29 8.9 0.0 6.7 13.3 19.4 21.7 21.7 21.1 24.4 9.4 6.7 -6.1 30 0.6 0.0 5.0 12.2 17.2 22.2 21.7 20.6 11.7 7.8 7.2 -3.9 31 5.6 0.0 8.3 0.0 18.9 0.0 22.2 21.1 0.0 3.9 0.0 -0.6 ----------------------------------------------------------------------------------------- Max 14.4 15.6 17.8 20.6 21.7 25.0 24.4 24.4 24.4 23.3 13.3 15.0 Min -2.8 -6.1 -1.1 2.2 13.3 17.8 19.4 19.4 11.7 3.9 2.2 -6.1 Mean 5.1 3.1 9.3 12.4 17.6 21.2 22.2 21.8 20.1 14.8 8.0 4.7 -----------------------------------------------------------------------------------------