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September Normals for Duncan, OK

< August October > Day Temperatures (°F) Precipitation (in) Degree Days Min Max Avg Heating Cooling 1 68 91 80 0.1 0 15 2 68 91 79 0.1 0 14 3 68 90 79 0.1 0 14 4 67 90 79 0.1 0 14 5 67 89 78 0.1 0 13 6 67 89 78 0.1 0 13 7 66 89 78 0.11 0 13 8 66 88 77 0.11 0 13 9 66 88 77 0.11 0 12 10 65 88 77 0.11 0 12 11 65 87 76 0.11 0 12 12 65 87 76 0.11 0 11 13 64 87 76 0.11 0 11 14 64 87 75 0.11 0 11 15 64 86 75 0.11 0 10 16 63 86 75 0.11 0 10 17 63 86 74 0.11 1 10 18 63 85 74 0.12 1 9 19 62 85 74 0.12 1 9 20 62 85 73 0.12 1 9 21 62 84 73 0.12 1 8 22 61 84 73 0.12 1 8 23 61 84 72 0.12 1 8 24 60 83 72 0.12 1 8 25 60 83 72 0.12 1 7 26 60 83 71 0.12 1 7 27 59 82 71 0.12 1 7 28 59 82 70 0.12 1 6 29 59 82 70 0.12 1 6 30 58 82 70 0.12 1 6 Month 63 86 75 3.37 14 306 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