Seattle, WA. Direct Normal Data Seattle, WA. Hourly Average Direct Normal Data For 2000 to 2013 Latitude: 47.68 degrees Longitude: 122.25 degrees Altitude: 20 meters Mon\Hr 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 Total Jan 0 0 0 0 0 39 98 143 160 166 169 143 104 15 0 0 0 0 1038 Feb 0 0 0 0 37 144 214 258 297 318 309 292 250 166 9 0 0 0 2291 Mar 0 0 0 17 90 152 205 263 270 284 261 240 227 188 78 0 0 0 2275 Apr 0 0 18 95 173 245 280 319 359 360 358 357 306 262 179 56 0 0 3366 May 0 6 77 155 194 253 290 325 345 365 361 348 327 287 223 135 20 0 3711 Jun 0 27 116 188 246 292 336 382 413 419 412 389 367 354 316 232 94 0 4583 Jul 0 17 155 247 306 364 417 487 522 538 558 565 559 524 458 341 119 0 6176 Aug 0 0 62 206 295 374 441 502 538 561 563 548 538 491 398 202 7 0 5725 Sep 0 0 2 107 216 289 359 414 440 471 474 453 417 348 174 6 0 0 4167 Oct 0 0 0 10 68 128 181 241 270 297 290 263 218 115 1 0 0 0 2082 Nov 0 0 0 0 17 85 136 184 210 229 211 176 106 5 0 0 0 0 1359 Dec 0 0 0 0 0 34 91 111 130 139 135 113 56 0 0 0 0 0 810 Values in Watt hours/meter^2 per hour Seattle, WA. Daily Average Direct Normal Data For 2000 to 2013 Latitude: 47.68 degrees Longitude: 122.25 degrees Altitude: 20 meters Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Yearly 2000 1.63 2.22 1.84 3.84 3.30 4.95 5.61 5.75 4.31 ---- 1.81 0.84 ---- 2001 1.42 3.82 3.51* 3.21 4.55 3.84 5.97 5.12 4.04 1.90 0.86 1.34 3.29 2002 0.45 2.17 1.67 2.91 3.10 5.35 6.26 6.26 5.17 2.64 1.77 0.65 3.21 2003 1.48 1.89 1.60 2.17 3.40 5.68 8.04 6.39 4.77 1.94 1.82 0.68 3.33 2004 0.57 1.73 2.36 5.42 3.44 6.69 6.13 5.29 2.98 2.27 0.90 0.69 3.21 2005 1.01 4.42 3.36 3.31 3.51 3.05 ---- ---- ---- ---- ---- ---- ---- 2006 ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- 2007 ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- 2008 ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- 2009 ---- ---- ---- ---- ---- 7.55* ---- ---- ---- 0.67* ---- ---- ---- 2010 ---- ---- ---- ---- ---- ---- ---- ---- 1.89* 3.26* ---- ---- ---- 2011 ---- ---- ---- ---- 3.73 3.14 5.18 5.59 4.54 1.51 1.16 0.78 ---- 2012 0.63 1.45 1.64 3.46 4.41 2.49 5.11 6.24 5.80 2.55 1.06 0.28 2.93 2013 1.07 0.87 2.57 2.57 4.06 5.08 7.16 5.22 2.91 1.99 1.40 1.17 3.02 Average 1.03 2.32 2.32 3.36 3.72 4.78 6.18 5.73 4.05 2.08 1.35 0.80 3.15 % SD 44 52 33 29 14 34 16 9 31 35 30 41 5 Values in average daily KWhr/meter^2 per Day * Less than 15 days of data in month. Univ. of Oregon Solar Radiation Monitoring Lab.