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