Daily minimum temperature (degrees Celsius) recorded at Grassland Soil and Water Research Center for calendar year 1999. ----------------------------------------------------------------------------------------- Day Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec ----------------------------------------------------------------------------------------- 1 9.8 4.3 8.0 15.1 14.4 23.7 24.3 22.4 20.5 12.8 11.7 5.4 2 2.4 9.3 14.5 19.8 16.8 23.3 24.2 22.4 21.8 14.4 7.8 14.3 3 -1.6 5.3 5.9 14.7 19.5 22.8 22.6 24.8 22.1 21.3 1.6 18.5 4 -4.3 10.9 3.6 13.4 22.3 23.3 22.2 23.2 22.6 17.2 8.2 8.9 5 -3.9 13.9 17.1 15.5 17.5 23.5 21.9 24.9 23.0 16.1 14.1 3.4 6 5.7 17.8 11.0 11.0 12.7 22.5 22.3 25.2 21.6 15.9 14.1 -2.0 7 9.5 11.0 10.4 17.8 12.6 21.3 22.2 23.9 21.0 11.9 12.4 .7 8 .6 14.6 11.3 20.1 14.9 20.9 22.4 24.1 23.2 14.9 12.8 13.8 9 -2.7 19.4 7.5 19.4 20.1 20.6 22.6 23.9 21.7 18.5 10.4 6.9 10 -2.5 19.0 11.7 18.6 16.4 21.6 22.4 23.3 21.5 17.6 12.6 2.3 11 2.3 7.2 13.4 14.3 14.9 19.6 22.0 23.4 23.6 19.7 13.5 6.8 12 10.6 .9 7.7 16.4 18.0 22.5 21.9 24.6 21.7 17.5 12.8 8.3 13 3.2 1.5 4.5 18.4 16.1 20.4 21.6 24.5 21.4 19.0 13.2 3.8 14 .3 4.2 3.3 14.1 18.7 20.7 21.5 24.7 19.5 19.7 11.2 1.8 15 -2.3 4.7 2.1 9.3 21.5 19.8 22.6 24.8 18.4 20.4 13.0 .9 16 3.2 10.6 4.4 6.3 21.9 20.7 21.5 22.4 18.3 18.5 13.1 -.3 17 12.4 5.2 11.7 5.2 16.8 21.3 22.2 22.6 19.0 10.2 12.3 2.4 18 6.2 7.6 16.6 10.7 17.8 20.3 21.9 23.6 18.9 8.8 11.8 6.2 19 6.8 6.1 10.1 14.7 16.5 20.3 21.5 24.0 19.2 8.9 14.1 1.5 20 9.6 8.3 6.4 17.7 19.6 22.0 21.8 25.9 20.2 7.5 8.7 3.4 21 14.8 4.0 7.1 19.4 19.7 21.6 21.8 23.2 17.4 9.8 11.4 1.0 22 5.0 1.2 9.2 20.9 20.4 21.7 21.8 23.1 13.0 12.1 17.7 2.7 23 4.2 6.2 13.6 20.6 19.6 23.6 22.2 23.9 12.6 14.9 10.5 1.4 24 3.8 7.8 13.1 18.3 21.5 23.7 21.6 24.0 14.1 10.3 5.5 4.1 25 7.4 14.4 11.7 18.6 19.6 21.0 21.5 24.3 19.8 8.0 4.0 3.2 26 11.2 18.9 8.0 15.4 17.1 23.5 23.1 23.6 21.5 11.8 3.7 8.2 27 13.5 12.6 11.7 14.2 18.8 25.4 22.2 23.7 20.6 11.1 5.0 6.9 28 14.6 7.4 12.1 16.7 18.0 25.8 22.8 23.8 18.9 14.5 9.1 1.4 29 8.0 12.4 17.3 16.7 23.8 22.0 23.8 15.3 15.2 9.6 7.2 30 3.0 12.1 16.0 20.8 23.9 23.1 23.5 12.8 11.5 7.0 8.1 31 4.1 13.1 20.2 23.0 23.2 11.3 5.5 ----------------------------------------------------------------------------------------- Max 14.8 19.4 17.1 20.9 22.3 25.8 24.3 25.9 23.6 21.3 17.7 18.5 Min -4.3 .9 2.1 5.2 12.6 19.6 21.5 22.4 12.6 7.5 1.6 -2.0 Mean 5.0 9.1 9.8 15.7 18.1 22.2 22.3 23.8 19.5 14.2 10.4 5.1 -----------------------------------------------------------------------------------------