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September Normals for Thornhill, VA

< August October > Day Temperatures (°F) Precipitation (in) Degree Days Min Max Avg Heating Cooling 1 62 82 72 0.12 0 7 2 62 82 72 0.12 0 6 3 61 81 71 0.12 0 6 4 61 81 71 0.12 0 6 5 61 81 71 0.13 0 6 6 61 81 71 0.13 0 6 7 61 80 71 0.13 0 5 8 60 80 70 0.13 0 5 9 60 80 70 0.13 0 5 10 60 80 70 0.13 0 5 11 59 79 69 0.13 0 5 12 59 79 69 0.13 0 4 13 59 79 69 0.13 0 4 14 58 79 69 0.13 0 4 15 58 78 68 0.13 1 4 16 58 78 68 0.13 1 4 17 57 78 68 0.13 1 3 18 57 77 67 0.13 1 3 19 57 77 67 0.13 1 3 20 56 77 66 0.13 2 3 21 56 76 66 0.13 2 3 22 55 76 66 0.13 2 3 23 55 76 65 0.13 2 3 24 54 75 65 0.13 3 2 25 54 75 64 0.13 3 2 26 53 75 64 0.13 3 2 27 53 74 64 0.13 3 2 28 53 74 63 0.13 4 2 29 52 74 63 0.13 4 2 30 51 73 62 0.13 4 2 Month 57 78 68 3.86 37 117 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