2017 Mixing Height Average Std Dev By Local Daylight Time By Local Daylight Time and Season January 613.0 410.7 Hour Annual Std Dev Winter Avg Spring Avg Summer Avg Fall Avg February 689.5 510.9 1 475.4 295.1 505.0 583.2 370.5 443.3 March 899.1 742.7 2 468.8 235.8 507.8 554.8 373.6 439.3 April 1070.0 1259.8 3 474.3 234.5 518.3 536.9 388.0 454.8 May 1037.0 1060.7 4 459.0 163.2 517.8 502.3 386.8 429.9 June 1152.0 1199.0 5 454.7 195.2 505.4 503.3 389.5 421.3 July 1268.0 1431.4 6 445.0 225.6 447.4 508.4 410.6 413.1 August 1220.5 1387.2 7 434.0 193.4 438.6 468.5 416.2 402.5 September 1018.3 1135.1 8 446.4 229.1 431.1 516.6 424.3 412.7 October 732.3 602.8 9 519.4 308.9 496.0 631.5 492.2 456.6 November 575.5 383.4 10 855.8 813.6 583.1 833.8 1372.5 625.5 December 571.5 315.1 11 1214.2 1004.4 677.5 1116.7 2126.3 921.5 12 1529.7 1165.7 804.6 1525.7 2440.9 1329.8 Annual 905.1 13 1658.3 1153.2 884.4 1646.4 2591.3 1492.5 Max 8055.0 14 1838.5 1306.3 986.8 1922.4 2851.3 1572.2 Min 120.0 15 1853.0 1228.7 1009.1 2039.5 2650.2 1693.0 Std Dev 990.0 16 1931.7 1317.1 1040.2 2203.2 2712.7 1749.4 17 1844.1 1338.1 838.7 2158.8 2866.7 1486.5 18 1722.9 1514.4 645.0 2173.4 2817.7 1226.6 19 861.1 1045.2 508.0 1263.7 1208.1 452.6 20 459.4 358.8 569.5 432.7 406.8 430.7 21 434.8 243.5 517.3 451.7 359.7 412.2 22 443.1 217.7 507.5 458.4 355.3 452.5 23 453.6 256.1 501.8 508.1 364.6 440.7 24 445.6 199.2 489.3 490.6 364.8 438.4 2017 Synoptic Pressure Gradient ORNL-NAM Boundary Layer Wind (kts) ORNL-NAM Boundary Layer Wind (kts) Average Std Dev 850-mb Average Std Dev 925-mb Average Std Dev January 0.012 0.007 January 26.9 12.7 January 18.5 10.4 February 0.011 0.007 February 24.2 11.9 February 17.1 10.2 March 0.012 0.006 March 23.2 11.8 March 17.8 8.8 April 0.010 0.006 April 21.4 11.9 April 16.4 8.8 May 0.008 0.005 May 20.7 11.4 May 14.8 8.0 June 0.005 0.003 June 13.0 10.0 June 11.3 7.7 July 0.004 0.003 July 11.6 7.7 July 9.6 6.3 August 0.004 0.003 August 10.4 6.8 August 10.1 5.9 September 0.006 0.007 September 14.6 11.6 September 12.3 7.7 October 0.009 0.007 October 15.9 10.8 October 12.7 8.3 November 0.009 0.006 November 18.1 10.8 November 14.4 8.9 December 0.011 0.006 December 20.6 12.2 December 15.3 9.1 Annual 0.008 0.006 Annual 18.4 12.0 Annual 14.2 8.9