1
Summary of climatic data by month for the ’17-18 crop year (September thru August) at the Western
Triangle Agricultural Research Center, Conrad, MT.
Month and Year
Precipitation (inches)
Mean Temperature (°F)
Current Year
Average (32 yr)
Difference
Current Year
Average (32 yr)
Difference
September, 2017
1.59
1.23
+0.36
55.1
56.8
-1.7
October, 2017
1.21
0.68
+0.53
42.0
44.6
-2.6
November, 2017
0.40
0.31
+0.09
28.3
32.0
-3.7
December, 2017
0.48
0.22
+0.26
19.5
23.5
-4.0
January, 2018
0.28
0.29
-0.01
21.9
23.0
-1.1
February, 2018
0.65
0.23
+0.42
8.7
24.2
-15.5
March, 2018
0.94
0.42
+0.52
23.1
32.7
-9.6
April, 2018
1.05
1.05
0
35.4
42.5
-7.1
May, 2018
1.08
1.84
-0.76
56.9
51.7
+5.2
June, 2018
2.73
2.87
-0.14
58.9
59.4
-0.5
July, 2018
0.34
1.36
-1.02
66.5
66.9
-0.4
August, 2018
1.04
1.22
-0.18
63.0
65.9
-2.9
Total or Average
11.79
11.72
+0.07
39.9
43.7
-3.8
Last killing frost in spring (32 °F)
2018-------------------------------- May 27
Average 1986-2018-------------- May 17
First killing frost in fall (32
°F)
2018-------------------------------- September 11
Average 1986-2018-------------- September 25
Frost free period (days)
2018------------------------------ 105
Average-------------------------- 130
Maximum summer temperature------- 100
°F (August 10, 2018)
Minimum winter temperature------- -22
°F (January 01, 2018)
