Daily minimum temperature (degrees Celsius) recorded at Grassland Soil and Water Research Center for calendar year 1998. ----------------------------------------------------------------------------------------- Day Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec ----------------------------------------------------------------------------------------- 1 4.3 10.9 1.4 9.9 13.9 21.8 24.2 23.3 23.1 22.0 12.2 11.5 2 14.6 9.6 2.7 8.8 16.1 21.2 23.8 25.2 24.3 23.3 9.8 13.9 3 16.3 5.9 3.0 12.4 17.9 24.5 24.1 25.5 24.9 24.2 11.6 17.4 4 17.5 2.9 8.8 7.9 12.5 23.6 24.5 25.1 25.8 24.4 9.4 18.0 5 17.2 5.7 11.2 8.9 19.0 18.8 24.8 23.5 22.8 16.0 6.4 18.4 6 9.8 3.5 8.5 13.1 21.8 15.7 23.7 22.8 21.2 13.6 4.0 15.8 7 4.3 .1 8.8 16.0 19.9 15.8 24.0 22.5 21.4 12.2 9.5 8.0 8 3.4 4.4 3.3 14.7 18.8 24.3 23.4 23.0 22.4 13.1 11.5 4.9 9 -.1 5.5 .2 10.1 20.8 24.2 23.5 22.8 24.0 13.9 13.5 6.2 10 5.9 8.4 -2.5 10.1 15.8 25.6 23.6 23.7 21.6 13.3 10.1 6.8 11 7.4 5.6 -.4 10.9 16.3 21.2 23.9 23.7 21.8 13.8 7.5 4.7 12 12.1 5.8 -1.5 15.8 19.8 24.6 25.0 24.8 22.1 19.8 9.2 5.0 13 4.1 5.3 4.4 18.6 19.8 24.1 26.4 22.8 21.7 17.7 8.9 2.4 14 4.5 8.2 10.4 18.3 22.3 24.8 22.2 22.4 21.9 16.3 11.6 4.1 15 1.6 9.0 15.1 18.6 22.6 20.6 21.8 22.0 23.6 17.0 12.4 3.7 16 2.6 9.0 12.1 15.2 19.9 20.3 23.5 22.4 21.5 21.4 11.4 5.1 17 3.6 5.6 7.9 12.0 19.2 24.7 24.7 22.9 22.2 20.6 12.3 5.1 18 6.9 3.0 11.1 11.1 17.5 27.1 23.3 23.8 22.3 16.9 15.3 6.8 19 2.8 6.9 6.5 10.4 16.5 25.7 23.7 23.6 22.9 15.1 16.6 8.4 20 5.8 3.7 3.9 11.8 19.8 25.3 24.2 24.7 22.9 14.8 10.2 8.1 21 6.7 6.0 3.0 11.2 20.6 23.9 24.0 23.7 23.2 13.2 9.8 -2.0 22 4.4 7.6 3.8 9.1 21.0 23.9 24.2 23.2 22.9 13.1 8.1 -4.1 23 -.1 4.5 8.9 11.9 22.0 23.6 23.2 22.6 22.1 9.1 13.4 -4.0 24 -.6 9.9 12.7 12.3 22.2 24.1 24.3 23.0 22.6 9.4 13.3 -2.5 25 3.9 12.3 17.2 16.4 21.2 23.1 24.7 24.0 22.2 13.3 15.6 -3.4 26 7.1 11.3 17.8 15.0 19.9 24.2 24.7 23.3 22.9 15.6 12.1 -3.0 27 2.8 4.8 13.1 14.7 18.3 24.6 25.3 23.4 25.0 17.3 14.1 3.7 28 4.6 7.5 15.9 11.7 21.1 25.4 24.6 25.1 24.8 18.9 16.2 2.9 29 7.1 .0 19.5 9.1 20.8 24.0 24.2 22.7 25.0 21.3 19.8 4.9 30 9.3 .0 14.8 10.5 20.9 24.7 23.8 21.8 21.6 20.8 15.8 1.0 31 12.4 .0 10.9 .0 21.4 .0 22.2 22.4 .0 19.2 .0 8.7 ----------------------------------------------------------------------------------------- Max 17.5 12.3 19.5 18.6 22.6 27.1 26.4 25.5 25.8 24.4 19.8 18.4 Min -.6 .1 -2.5 7.9 12.5 15.7 21.8 21.8 21.2 9.1 4.0 -4.1 Mean 6.5 6.5 8.1 12.5 19.3 23.2 24.0 23.4 22.9 16.8 11.7 5.7 -----------------------------------------------------------------------------------------