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Yearly Normals for Chinook, MT

Month Temperatures (°F) Precipitation (in) Degree Days Min Max Avg Heating Cooling Jan -1 26 13 0.54 1624 0 Feb 6 33 20 0.32 1265 0 Mar 17 45 31 0.56 1058 0 Apr 30 59 44 0.99 618 0 May 41 69 55 2.29 318 7 Jun 50 78 64 2.29 108 74 Jul 53 84 69 1.66 38 147 Aug 51 84 68 1.34 69 148 Sep 39 72 55 1.43 314 25 Oct 27 59 43 0.66 675 0 Nov 13 40 27 0.47 1145 0 Dec 4 30 17 0.51 1497 0 Year 28 57 42 13.06 8729 401 Data Controls Monthly | Yearly Related Maps Related Links Normal High Temperatures Normal Low Temperatures Normal Mean Temperatures Normal Precipitation - Forecast - Past Weather