2017 Mixing Height Average Std Dev By Local Daylight Time By Local Daylight Time and Season January 538.5 437.5 Hour Annual Std Dev Winter Avg Spring Avg Summer Avg Fall Avg February 622.2 541.5 1 376.8 312.2 407.2 487.9 269.5 343.0 March 840.7 777.8 2 369.6 252.0 407.8 461.1 272.0 338.1 April 1004.6 1292.4 3 375.7 251.7 419.9 441.8 286.5 355.3 May 975.7 1093.8 4 358.3 177.8 420.4 403.8 285.6 324.3 June 1092.6 1236.3 5 354.7 209.0 405.0 410.3 289.1 314.9 July 1209.0 1469.1 6 350.2 243.5 356.9 420.6 313.0 310.0 August 1161.3 1425.3 7 344.7 211.8 366.2 381.0 322.9 308.9 September 962.7 1168.6 8 362.3 246.8 354.6 430.9 335.0 328.1 October 662.6 640.3 9 441.0 335.8 419.8 556.6 415.7 370.6 November 499.6 417.4 10 799.6 840.8 506.0 778.1 1346.9 558.3 December 491.2 348.0 11 1184.3 1025.9 617.4 1090.1 2120.5 893.8 12 1512.5 1181.3 763.8 1511.9 2437.8 1318.1 Annual 839.6 13 1642.4 1169.3 847.4 1636.0 2587.5 1479.7 Max 8054.7 14 1823.7 1321.5 951.0 1912.2 2847.2 1562.8 Min 100.0 15 1838.3 1245.1 974.0 2030.7 2643.2 1684.7 Std Dev 1022.5 16 1917.8 1332.7 1010.6 2194.4 2706.2 1738.4 17 1821.6 1362.5 787.6 2150.9 2860.0 1461.4 18 1690.6 1543.0 578.9 2158.0 2812.0 1184.0 19 801.4 1072.9 423.8 1208.8 1171.5 388.8 20 382.0 374.2 487.4 349.1 335.9 357.7 21 345.7 258.0 428.6 356.6 274.1 325.1 22 349.7 232.6 413.8 368.8 259.8 357.8 23 358.6 271.6 410.4 418.2 263.9 342.9 24 350.0 213.9 398.3 395.9 263.2 343.7 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