Daily minimum temperature (degrees Celsius) recorded at Grassland Soil and Water Research Center for calendar year 1997. ----------------------------------------------------------------------------------------- Day Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec ----------------------------------------------------------------------------------------- 1 13.5 8.0 12.5 11.7 14.3 16.5 22.7 23.0 23.6 19.6 13.6 8.0 2 15.2 14.7 5.9 15.4 20.4 17.5 22.0 22.1 23.6 20.0 9.6 9.0 3 17.4 14.2 3.5 16.3 13.1 19.6 22.6 23.7 22.5 18.1 6.3 4.7 4 15.6 9.4 10.9 12.9 12.8 20.5 22.1 23.3 22.6 16.9 8.5 1.4 5 8.9 5.4 7.5 10.3 16.6 21.2 21.3 24.3 20.4 20.9 15.3 1.9 6 -.4 5.4 4.5 11.3 16.6 19.7 21.2 23.2 17.5 20.5 7.4 1.4 7 -.9 5.1 9.3 9.6 17.4 20.2 20.7 20.3 21.2 20.2 4.3 6.0 8 -.6 2.4 15.3 14.0 19.8 19.8 22.3 18.6 22.0 22.1 5.6 7.5 9 -2.7 2.2 16.0 11.7 14.9 20.0 23.3 21.9 23.4 22.6 11.6 7.3 10 -.8 4.5 13.2 11.7 13.8 19.5 22.1 24.1 22.0 21.9 5.8 3.2 11 -5.8 1.5 13.1 4.7 14.0 20.1 23.4 23.9 21.2 22.2 2.4 .7 12 -5.4 5.0 16.0 2.1 14.6 22.4 22.0 24.3 20.5 22.4 7.4 -1.5 13 -5.7 4.6 15.6 1.8 11.1 24.0 20.7 24.4 21.0 12.9 7.5 -4.6 14 -3.9 4.1 5.6 8.4 16.6 24.6 22.6 23.3 22.0 10.1 7.5 .2 15 -1.4 1.6 3.3 7.8 18.7 22.2 22.2 24.6 22.8 10.0 1.1 .2 16 -1.8 3.6 8.7 8.9 16.7 24.7 21.8 25.4 22.7 12.1 -.1 3.2 17 -5.1 5.3 10.5 13.0 17.8 19.4 22.9 24.5 22.9 11.0 1.8 2.6 18 -2.8 10.4 12.3 12.9 20.3 19.6 22.7 23.7 23.0 10.2 4.2 4.2 19 1.2 15.9 6.7 15.3 20.4 21.2 22.8 23.3 22.0 12.6 4.3 6.7 20 9.6 14.9 5.6 13.8 17.9 23.1 22.8 23.4 21.8 13.5 7.9 10.5 21 12.7 6.6 11.8 17.5 18.3 20.3 22.4 24.0 21.7 13.4 8.5 4.8 22 9.4 2.2 12.8 16.0 18.3 20.4 23.5 22.8 23.0 12.0 5.0 5.2 23 11.2 8.4 11.6 13.7 18.6 23.0 22.8 21.6 22.7 13.8 6.8 7.8 24 11.0 7.0 15.3 13.1 19.5 23.2 22.8 20.4 20.2 14.4 6.9 3.7 25 5.0 6.6 10.4 12.1 18.3 20.4 23.3 19.9 18.2 13.2 15.0 2.1 26 8.0 6.4 7.8 11.7 23.9 22.4 23.5 19.0 14.9 7.3 18.4 2.5 27 -1.6 4.1 11.5 12.0 21.1 21.9 23.9 20.8 18.0 3.8 18.0 -.3 28 -5.3 8.1 14.4 11.6 18.2 23.3 24.1 21.8 17.7 6.8 12.9 .1 29 -5.0 .0 14.9 11.8 18.1 23.2 24.1 22.5 19.3 10.9 8.9 .5 30 -1.6 .0 12.0 17.8 20.9 23.5 22.4 21.5 19.1 17.4 6.5 2.9 31 4.2 .0 11.0 .0 19.5 .0 22.9 22.2 .0 18.5 .0 3.9 ----------------------------------------------------------------------------------------- Max 17.4 15.9 16.0 17.8 23.9 24.7 24.1 25.4 23.6 22.6 18.4 10.5 Min -5.8 1.5 3.3 1.8 11.1 16.5 20.7 18.6 14.9 3.8 -.1 -4.6 Mean 3.0 6.7 10.6 11.7 17.5 21.2 22.6 22.6 21.1 15.2 8.0 3.4 -----------------------------------------------------------------------------------------