Average Mean Temperature Index by month Climatology by state based on climate division data: 1971-2000 State Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Average Alabama 44.29 48.04 55.47 61.99 69.89 76.75 79.87 79.04 73.88 63.08 54.10 46.85 62.77 Arizona 42.27 46.24 51.03 57.63 66.01 75.51 80.19 78.50 72.52 61.61 49.64 42.51 60.31 Arkansas 38.48 43.76 51.96 60.36 68.62 76.40 80.57 79.26 72.26 61.47 50.32 41.59 60.42 California 45.14 48.51 51.76 56.50 63.11 70.18 75.32 74.62 69.97 61.56 51.17 44.98 59.40 Colorado 23.71 28.34 35.57 43.06 52.50 62.15 67.60 65.75 57.72 46.64 33.51 25.20 45.15 Connecticut 25.96 28.43 36.94 47.07 57.77 66.29 71.52 69.77 61.68 50.60 41.43 31.13 49.05 Delaware 33.95 35.93 44.04 53.02 62.80 71.59 76.45 74.70 68.08 56.95 47.33 38.44 55.27 Florida 58.09 59.99 64.90 69.29 75.36 79.98 81.60 81.44 79.42 72.66 66.01 59.99 70.73 Georgia 45.77 49.22 56.29 62.73 70.38 76.96 80.08 78.99 74.09 64.00 55.57 48.06 63.51 Idaho 23.60 28.36 35.87 43.49 51.56 59.35 66.24 65.37 56.16 45.51 32.81 24.32 44.39 Illinois 24.58 30.06 40.72 51.68 62.36 71.55 75.43 73.22 65.79 54.20 41.51 29.75 51.74 Indiana 26.03 30.55 40.76 51.11 61.50 70.57 74.37 72.31 65.23 53.68 42.36 31.17 51.64 Iowa 17.84 24.15 35.98 48.53 60.23 69.74 73.76 71.33 62.92 50.95 35.61 22.62 47.81 Kansas 28.77 34.54 43.82 53.59 63.28 73.40 78.79 76.91 67.99 56.22 41.81 31.93 54.25 Kentucky 32.93 37.23 46.21 55.15 63.96 72.28 76.31 74.78 68.06 56.64 46.37 37.18 55.59 Louisiana 48.71 52.63 59.49 65.99 73.56 79.62 82.08 81.61 76.91 67.03 58.16 50.95 66.39 Maine 13.58 16.68 27.02 39.10 51.26 60.79 66.08 64.19 55.13 43.99 33.48 20.36 40.97 Maryland 32.24 34.87 43.26 52.69 62.35 70.80 75.44 73.77 67.01 55.70 45.72 36.76 54.22 Massachusetts 24.87 27.21 35.51 45.43 56.16 64.95 70.37 68.63 60.54 49.69 40.71 30.24 47.86 Michigan 18.87 21.37 30.73 42.57 54.48 63.56 68.32 66.52 58.61 47.58 35.72 24.57 44.41 Minnesota 7.94 15.27 27.55 42.45 55.75 64.67 69.08 66.82 57.15 45.19 28.27 13.77 41.16 Mississippi 44.21 48.46 55.94 62.90 70.86 77.73 80.73 79.86 74.47 63.70 54.40 46.90 63.35 Missouri 28.83 34.58 44.50 54.70 63.93 72.74 77.54 75.72 67.55 56.33 43.98 33.01 54.45 Montana 18.37 24.44 32.86 42.53 52.18 60.58 66.43 65.64 55.09 44.26 29.67 20.86 42.74 Nebraska 22.73 28.54 37.59 48.14 58.73 68.87 74.26 72.20 62.64 50.49 35.38 25.64 48.77 Nevada 30.43 35.46 41.18 47.26 55.66 64.88 71.94 70.21 61.61 50.55 38.41 30.90 49.87 New Hampshire 18.17 21.06 30.79 42.15 54.10 62.98 67.83 65.67 57.05 45.90 35.85 24.12 43.80 New Jersey 30.62 32.90 40.99 50.44 60.49 69.30 74.47 72.68 65.48 54.13 44.91 35.38 52.65 New Mexico 34.39 38.92 44.87 51.79 60.66 69.68 73.21 71.30 64.76 54.31 42.44 34.94 53.44 New York 20.65 22.72 31.93 43.51 55.33 63.95 68.66 66.75 58.85 47.76 37.59 26.48 45.35 North Carolina 39.97 42.95 50.30 58.26 66.14 73.50 77.49 75.96 70.24 59.47 50.88 42.91 59.01 North Dakota 7.90 15.40 26.87 41.71 54.80 63.73 68.70 67.23 56.14 43.62 26.08 13.02 40.43 Ohio 26.50 29.92 39.55 49.67 59.99 68.79 72.78 70.92 63.99 52.54 41.90 31.61 50.68 Oklahoma 36.11 41.71 50.21 59.07 67.85 76.53 81.62 80.45 72.37 61.30 48.28 38.96 59.54 Oregon 32.63 36.68 41.47 46.35 52.95 59.66 66.03 65.55 58.56 49.24 38.96 32.78 48.41 Pennsylvania 25.78 28.29 37.02 47.48 57.74 66.17 70.58 68.92 61.62 50.34 40.65 30.70 48.77 Rhode Island 29.10 30.80 37.91 46.71 56.50 65.27 71.09 70.04 62.81 52.56 43.83 34.21 50.07 South Carolina 44.12 47.35 54.54 61.80 69.59 76.45 80.08 78.58 73.19 62.70 54.20 46.45 62.42 South Dakota 16.11 22.53 32.60 45.02 56.79 66.47 72.47 70.75 60.35 47.57 31.15 19.84 45.14 Tennessee 36.32 40.58 49.02 57.23 65.53 73.44 77.29 75.87 69.45 58.10 48.29 39.76 57.57 Texas 45.63 50.28 57.71 64.84 72.61 79.34 82.30 81.41 75.47 66.01 55.11 47.28 64.83 Utah 25.93 31.48 39.67 46.89 55.93 65.68 72.51 70.67 61.53 49.61 36.38 27.34 48.64 Vermont 16.41 18.87 29.10 41.40 54.04 62.69 67.38 65.12 56.56 45.31 34.97 22.71 42.88 Virginia 34.48 37.55 45.40 54.30 62.74 70.81 75.10 73.50 67.04 55.76 46.61 38.09 55.11 Washington 31.47 35.75 41.51 47.40 54.15 60.09 65.73 65.81 58.76 48.50 38.27 31.74 48.26 West Virginia 30.21 33.36 41.82 50.92 59.85 67.83 71.95 70.55 63.92 52.70 43.13 34.36 51.72 Wisconsin 13.18 18.97 30.09 43.17 55.46 64.47 69.11 66.86 58.11 46.63 32.35 18.98 43.12 Wyoming 19.18 23.72 32.06 40.42 50.01 59.62 66.25 64.71 54.64 43.39 29.18 20.64 41.98 Calculated at NOAA-CIRES CDC based on data obtained from NCDC