4
Sept. Oct. Nov. Dec. Jan. Feb. Mar. Apr. May June July Aug.
2017 2017 2017 2017 2018 2018 2018 2018 2018 2018 2018 2018
Precipitation (inches) Total
Current Year 0.99 1.28 1.69 2.98 1.17 2.14 0.42 1.54 1.78 2.63 0.30 0.22 17.14
1981-2018 1.58 1.43 1.61 1.54 1.38 1.23 1.31 1.76 2.32 3.31 1.48 1.06 20.01
Average Temperature (F°) Average
Current Year 54.0 41.4 35.4 28.9 33.8 26.6 37.0 43.6 58.4 59.7 66.3 65.5 45.9
1980-2018 53.8 42.4 32.6 24.1 24.3 27.2 35.0 42.8 51.6 57.9 64.5 63.6 43.3
Last killing frost
1
in spring
Spring 2018
Apr 26
32°
Median for 1980-2017
May 19
31°
First killing frost
1
in fall
Fall 2018
Median for 1980-2017
Sep 16 29°
Frost Free Period
Avg. 1980-2016
122 days
Growing Degree Days April - August 2018
April May June July Aug Total
Base 50 96.0 353.5 338.0 499.5 493.0 1780.0
Base 40 210.5 575.0 590.0 779.0 744.5 2899.0
Base 32 369.0 817.5 830.0 1019.0 984.5 4020.0
Maximum summer temperature
Aug 11 98°
Minimum winter temperature
1. In this summary 32 degrees or below is considered a killing frost.
Summary of Climatic Data by Months for the 2018 Crop Year: September 2017 - August 31, 2018
and Averages for the Years 1980-2018 at the
Northwestern Agricultural Research Center, Kalispell, Montana
