2011 Mixing Height Average Std Dev By Local Time of Day By Local Time of Day and Season January 416.8 338.7 Hour Annual S td Dev Winter Avg Spring Avg Summer Avg Fall Avg February 441.4 388.3 1 267.8 217.8 281.0 313.0 196.8 280.9 March 533.9 475.8 2 267.9 209.4 279.9 318.8 193.1 280.2 April 645.7 683.6 3 259.6 194.2 275.0 277.1 196.7 290.1 May 690.0 818.7 4 251.3 178.0 287.2 230.9 200.1 288.2 June 799.7 1177.4 5 255.2 201.5 275.8 275.0 190.3 280.4 July 759.4 892.6 6 267.0 259.4 253.1 296.7 193.2 325.4 August 888.3 1104.5 7 262.5 227.1 248.8 267.7 205.9 327.8 September 686.3 790.1 8 323.8 277.1 284.6 334.3 318.0 357.7 October 572.9 608.5 9 465.3 365.4 334.9 479.2 570.8 473.6 November 397.8 362.1 10 716.5 620.3 408.6 723.9 1086.5 639.3 December 332.1 250.7 11 962.4 774.0 486.8 991.9 1568.7 818.8 12 1133.8 863.0 609.9 1178.6 1819.8 891.6 Annual 597.6 13 1257.5 953.2 674.8 1289.8 1862.6 1189.4 Max 6428.6 14 1325.0 956.2 723.3 1240.8 2010.2 1312.6 Min 75.0 15 1369.2 996.1 761.9 1367.5 2054.8 1278.4 Std Dev 740.1 16 1398.0 1070.6 722.3 1407.2 2168.4 1277.9 17 1207.7 1053.9 547.5 1373.3 1940.0 952.9 18 772.9 917.3 365.0 935.5 1384.0 394.0 19 340.4 423.9 275.2 306.5 484.7 293.2 20 240.8 213.1 290.9 237.0 176.4 260.2 21 246.8 210.1 273.7 279.0 180.0 255.4 22 247.3 201.1 279.4 264.7 195.3 250.7 23 254.3 228.8 288.2 259.1 192.0 278.8 24 249.4 184.3 270.4 263.2 195.2 269.0 2011 Synoptic Pressure Gradient 850 mb Wind Speed (mph) Average Std Dev Average Std Dev January 0.015 0.009 January 18.4 8.3 February 0.021 0.011 February 23.9 14.6 March 0.019 0.011 March 21.2 11.3 April 0.016 0.007 April 28.6 11.2 May 0.010 0.007 May 18.8 11.2 June 0.006 0.004 June 13.2 7.8 July 0.003 0.003 July 9.3 8.3 August 0.005 0.003 August 12.6 6.2 September 0.007 0.007 September 13.7 8.1 October 0.008 0.006 October 19.9 9.7 November 0.011 0.005 November 29.9 11.8 December 0.009 0.006 December 23.7 13.1 Annual 0.011 0.007 Annual 19.4 10.1