Weather Summary

Monthly Temperatures (F) and Normals
Max Temp Min Temp Monthly Avg. Temp
Month 1999 Norm 1997 1998 1999 Norm 1997 1998 1999 Norm 1997 1998
Apr 52 52 45 60 32 28 24 36 42 40 34 48
May 65 66 66 70 45 40 39 45 55 53 52 57
June 73 75 78 70 54 51 54 50 64 63 66 60
July 79 81 78 82 57 56 57 55 68 69 68 68
Aug 78 80 79 83 54 53 53 57 66 66 66 70
Sept 64 68 73 76 43 42 46 47 54 55 59 61
Avgs: 69 70 70 73 48 45 45 48 58 58 58 61
Normals = 1961-1990 averages

 

Monthly Precipitation (in) and Normals
Month Monthly Precip Normal Percent of Normal 1997 1998
Apr 2.31 1.62 143% 2.8 0.89
May 4.51 2.19 206% 0.61 1.68
June 3.81 3.48 109% 1.6 1.79
July 2.41 2.76 87% 3.37 1.37
Aug 4.42 2.01 220% 1.45 1.4
Sept 1.35 1.73 78% 0.71 0.74
Totals: 18.81 13.79 136% 10.54 7.87

Normals = 1961-1990 averages

 

Monthly Growing Degree Days and Normals
Wheat GDD Sunflower GDD Corn GDD
Month 1999 Norm 1997 1998 1999 1997 1998 1999 Norm 1997 1998
Apr 349 331 241 494 --- --- --- --- --- --- ---
May 722 680 646 794 384 354 463 254 268 249 329
June 951 938 1024 835 593 664 509 424 420 494 358
July 1117 1143 1114 1134 745 742 763 549 574 560 579
Aug 1064 1071 1058 1184 692 690 812 511 514 509 616
Sept 653 710 832 890 338 502 565 219 282 368 419
Totals 4856 4873 4915 5331 2752 2952 3112 1957 2058 2180 2301
Normals = 1961-1990 averages

 

Growing season GDD Totals and Killing Frost Dates
Year Frost Date Corn Temp (F) Total GDD Frost Date Sunflower Temp (F) Total GDD
1997 20-Sep 28 2043 20-Oct 23 2992
1998 21-Sep 31 2205 13-Oct 26 2912
1999 30-Sep 26 1957 30-Sep 26 2548
Total corn GDD = May 1 to frost date
Total sunflower GDD = May 20 to frost date

 

NDSU Vice President,
Dean and Director for Agricultural Affairs		 NDSU Extension Service ND Agricultural
Experiment Station		 NDSU College of Agriculture NDSU College of Human Development and Education