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December Normals for Islip Terrace, NY

< November January > Day Temperatures (°F) Precipitation (in) Degree Days Min Max Avg Heating Cooling 1 34 50 42 0.13 23 0 2 34 49 42 0.13 23 0 3 33 49 41 0.13 24 0 4 33 49 41 0.13 24 0 5 33 48 40 0.13 25 0 6 32 48 40 0.13 25 0 7 32 48 40 0.12 25 0 8 32 47 39 0.12 26 0 9 31 47 39 0.12 26 0 10 31 47 39 0.12 26 0 11 31 46 38 0.12 27 0 12 30 46 38 0.12 27 0 13 30 46 38 0.12 27 0 14 30 45 38 0.13 27 0 15 30 45 37 0.13 28 0 16 29 45 37 0.13 28 0 17 29 44 37 0.13 28 0 18 29 44 36 0.13 28 0 19 29 44 36 0.13 29 0 20 28 44 36 0.13 29 0 21 28 43 36 0.13 29 0 22 28 43 36 0.13 29 0 23 28 43 35 0.13 30 0 24 27 43 35 0.13 30 0 25 27 42 35 0.13 30 0 26 27 42 35 0.13 30 0 27 27 42 34 0.13 31 0 28 27 42 34 0.13 31 0 29 27 42 34 0.13 31 0 30 26 41 34 0.13 31 0 31 26 41 34 0.13 31 0 Month 30 45 37 3.96 858 0 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