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Climatological Normals

September Normals for Jefferson, IA

< August October > Day Temperatures (°F) Precipitation (in) Degree Days Min Max Avg Heating Cooling 1 56 80 68 0.11 1 5 2 56 80 68 0.11 2 4 3 55 80 68 0.11 2 4 4 55 80 67 0.11 2 4 5 54 79 67 0.11 2 4 6 54 79 67 0.12 2 4 7 54 79 66 0.12 2 3 8 53 79 66 0.12 2 3 9 53 78 66 0.12 2 3 10 52 78 65 0.12 3 3 11 52 78 65 0.11 3 3 12 52 77 65 0.11 3 3 13 51 77 64 0.11 3 2 14 51 77 64 0.11 3 2 15 50 76 63 0.11 4 2 16 50 76 63 0.11 4 2 17 50 76 63 0.11 4 2 18 49 76 62 0.11 4 2 19 49 75 62 0.11 5 1 20 49 75 62 0.11 5 1 21 48 74 61 0.11 5 1 22 48 74 61 0.11 5 1 23 47 74 60 0.11 6 1 24 47 73 60 0.11 6 1 25 47 73 60 0.11 6 1 26 46 73 59 0.1 6 1 27 46 72 59 0.1 7 1 28 45 72 59 0.1 7 1 29 45 72 58 0.1 7 1 30 45 71 58 0.1 8 1 Month 50 76 63 3.3 121 67 Data Controls Monthly: January February March April May June July August September October November December   | Yearly Related Maps Related Links Normal High Temperatures Normal Low Temperatures Normal Mean Temperatures Normal Precipitation - Forecast - Past Weather