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September Normals for Mason, IL

< August October > Day Temperatures (°F) Precipitation (in) Degree Days Min Max Avg Heating Cooling 1 60 82 71 0.09 1 7 2 59 82 71 0.1 1 6 3 59 82 70 0.1 1 6 4 59 81 70 0.1 1 6 5 59 81 70 0.1 1 6 6 58 81 70 0.1 1 6 7 58 81 69 0.1 1 5 8 58 80 69 0.1 1 5 9 57 80 69 0.1 1 5 10 57 80 68 0.1 1 5 11 57 80 68 0.1 1 5 12 56 79 68 0.1 2 4 13 56 79 68 0.1 2 4 14 55 79 67 0.11 2 4 15 55 78 67 0.11 2 4 16 55 78 67 0.11 2 4 17 54 78 66 0.11 2 3 18 54 78 66 0.11 2 3 19 54 77 65 0.1 3 3 20 53 77 65 0.1 3 3 21 53 77 65 0.1 3 3 22 53 76 64 0.1 3 3 23 52 76 64 0.1 4 3 24 52 76 64 0.1 4 2 25 51 75 63 0.1 4 2 26 51 75 63 0.1 4 2 27 50 75 63 0.1 5 2 28 50 74 62 0.1 5 2 29 50 74 62 0.1 5 2 30 49 73 61 0.1 5 2 Month 55 78 67 3.04 73 117 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