2013 Mixing Height Average Std Dev By Local Daylight Time By Local Daylight Time and Season January 407.6 243.4 Hour Annual Std Dev Winter Avg Spring Avg Summer Avg Fall Avg February 496.3 369.2 1 320.4 126.1 350.1 333.0 274.7 324.7 March 576.7 457.7 2 335.4 147.5 379.9 343.6 273.4 346.0 April 628.6 513.8 3 341.3 153.4 377.2 346.6 281.3 360.4 May 669.6 615.0 4 350.7 204.3 390.6 360.7 288.1 361.0 June 651.0 603.5 5 352.1 154.9 386.8 353.7 302.9 365.1 July 636.0 728.7 6 339.4 126.8 372.0 339.9 301.0 345.5 August 906.9 953.5 7 336.4 125.4 359.8 334.4 302.1 350.0 September 822.5 817.8 8 349.6 150.7 362.8 331.0 332.4 372.8 October 611.3 500.1 9 409.7 185.3 384.3 402.8 406.1 445.5 November 669.6 563.7 10 544.6 303.0 443.7 535.0 579.1 619.3 December 577.2 338.4 11 716.5 352.0 530.7 700.3 869.3 762.3 12 942.3 607.1 608.0 949.6 1223.5 981.3 Annual 638.3 13 1126.9 631.6 699.0 1117.5 1423.3 1259.9 Max 6474.2 14 1245.9 723.8 761.2 1241.8 1631.4 1339.8 Min 82.1 15 1326.5 729.4 822.2 1350.3 1701.5 1422.1 Std Dev 605.7 16 1372.4 797.7 887.5 1392.2 1743.4 1459.9 17 1349.8 821.9 842.6 1377.1 1665.7 1504.6 18 1143.8 739.4 671.0 1147.2 1340.1 1409.5 19 690.7 813.2 398.6 373.6 1003.4 984.3 20 429.7 463.8 371.3 327.0 579.3 440.3 21 323.5 202.2 372.2 323.9 270.3 328.8 22 321.7 196.0 359.1 322.9 255.6 350.5 23 321.6 161.9 349.9 344.5 261.5 331.2 24 328.9 168.9 366.1 350.0 262.3 336.9 2013 Synoptic Pressure Gradient 850 mb Wind Speed (mph) Average Std Dev Average Std Dev January 0.012 0.006 January 25.1 11.1 February 0.012 0.006 February 23.5 11.4 March 0.011 0.006 March 22.5 10.9 April 0.010 0.004 April 19.8 10.8 May 0.008 0.004 May 18.0 7.6 June 0.006 0.003 June 15.7 8.8 July 0.005 0.003 July 14.1 7.2 August 0.004 0.002 August 10.8 4.5 September 0.005 0.002 September 9.8 6.1 October 0.006 0.005 October 15.5 16.9 November 0.011 0.007 November 21.8 10.5 December 0.011 0.008 December 25.5 12.8 Annual 0.008 0.006 Annual 18.4 11.6