2015 Mixing Height Average Std Dev By Local Daylight Time By Local Daylight Time and Season January 540.2 464.9 Hour Annual Std Dev Winter Avg Spring Avg Summer Avg Fall Avg February 593.3 489.8 1 291.9 300.3 420.2 284.0 211.7 255.6 March 628.7 655/1 2 281.9 296.6 382.5 260.4 235.8 250.7 April 891.7 898.6 3 287.2 319.3 346.4 277.6 264.0 261.6 May 1182.3 1343.0 4 274.8 247.4 355.9 265.4 229.0 250.2 June 1266.3 1472.1 5 270.8 217.8 325.6 275.3 231.1 252.5 July 954.8 1085.6 6 264.9 232.3 326.0 269.5 227.5 237.4 August 974.6 1157.3 7 283.2 250.0 350.5 296.0 240.6 247.0 September 887.4 1117.8 8 305.0 279.0 391.1 327.8 248.5 254.2 October 604.8 690.6 9 364.7 336.8 402.6 454.1 315.5 287.2 November 490.8 460.6 10 664.2 852.4 445.4 839.4 997.4 371.4 December 534.9 574.2 11 1051.8 1017.2 548.5 1317.4 1549.3 767.1 12 1411.4 1064.0 755.9 1626.2 2002.9 1237.2 Annual 796.5 13 1499.4 1003.6 809.0 1726.8 2033.9 1411.8 Max 7112.0 14 1619.8 993.5 903.6 1821.6 2252.9 1483.9 Min 75.0 15 1750.9 1010.2 991.8 1980.5 2490.3 1522.1 Std Dev 969.6 16 1807.6 1087.0 998.7 1989.7 2569.6 1653.3 17 1876.6 1197.7 1005.7 1984.8 2738.3 1757.1 18 1775.9 1188.4 848.7 2042.0 2613.8 1576.7 19 1185.4 1236.5 609.3 1546.8 2105.7 459.5 20 630.1 911.3 499.6 774.1 942.2 298.2 21 330.3 385.9 435.1 341.3 294.6 251.6 22 317.5 379.3 417.2 308.6 268.8 276.9 23 288.7 284.5 378.3 315.3 233.7 229.0 24 277.2 270.6 368.7 278.0 206.2 257.6 2015 Synoptic Pressure Gradient 850 mb Wind Speed (kts) Average Std Dev Average Std Dev January 0.012 0.007 January 22.7 10.2 February 0.014 0.009 February 22.5 12.9 March 0.011 0.007 March 22.1 11.4 April 0.010 0.005 April 20.1 11.8 May 0.007 0.004 June 0.004 0.003 ORNL-NAM Boundary Layer Wind (kts) July 0.004 0.002 May 8.2 2.5 August 0.005 0.003 June 5.2 2.1 September 0.005 0.003 July 4.3 1.4 October 0.008 0.005 August 3.9 1.3 November 0.009 0.006 September 3.8 1.3 December 0.010 0.006 October 5.1 2.7 November 4.7 2.0 Annual 0.008 0.006 December 5.1 1.9 Annual 5.4 1.8