2015 Mixing Height Average Std Dev By Local Daylight Time By Local Daylight Time and Season January 549.5 458.8 Hour Annual Std Dev Winter Avg Spring Avg Summer Avg Fall Avg February 604.4 480.3 1 312.1 296.4 429.3 308.1 228.8 284.6 March 642.4 647.9 2 305.2 293.2 398.2 284.8 253.8 286.0 April 898.6 913.0 3 309.5 316.0 365.3 296.5 283.9 293.5 May 1202.2 1327.7 4 298.8 244.1 372.5 283.9 256.7 283.4 June 1280.8 1460.8 5 298.1 214.4 346.8 300.8 254.1 291.8 July 967.0 1077.7 6 294.5 228.9 351.4 298.0 250.8 279.0 August 988.7 1146.4 7 307.1 245.9 367.6 317.4 265.0 279.5 September 906.9 1106.9 8 331.4 272.8 410.6 350.2 277.3 289.1 October 625.8 679.5 9 392.3 326.7 420.9 473.8 352.4 322.6 November 511.8 439.5 10 684.7 828.6 463.7 858.1 1023.4 385.6 December 555.4 564.6 11 1063.5 1004.3 563.2 1325.8 1558.2 792.8 12 1415.0 1057.0 761.2 1629.6 2006.9 1247.1 Annual 811.9 13 1504.0 998.0 819.7 1729.4 2035.4 1415.2 Max 7112.0 14 1626.0 988.0 909.2 1837.2 2252.7 1487.0 Min 120.0 15 1756.0 1006.0 998.7 1989.4 2490.4 1526.1 Std Dev 960.0 16 1809.0 1081.0 1008.3 1980.5 2570.4 1656.0 17 1880.0 1193.0 1015.1 1986.4 2738.0 1760.2 18 1782.0 1180.0 858.6 2048.9 2613.3 1585.3 19 1196.0 1230.0 629.6 1555.6 2112.2 465.0 20 637.0 909.0 509.5 778.6 948.0 307.0 21 342.4 383.8 449.2 352.5 306.2 262.9 22 330.8 377.6 426.2 322.4 277.1 299.4 23 307.0 281.9 390.5 332.6 250.9 255.2 24 300.9 267.3 381.7 304.4 232.6 286.4 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