Seattle, WA. Global Spectral Data UVB Seattle, WA. Hourly Average Global Spectral Data UVB 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 0.0 0.0 0.0 1.3 4.6 8.8 12.3 13.4 11.4 7.3 3.2 0.5 0.0 0.0 0.0 0.0 62.9 Feb 0.0 0.0 0.0 0.0 0.6 3.9 10.2 17.9 24.6 26.8 23.2 15.9 8.4 2.8 0.2 0.0 0.0 0.0 134.4 Mar 0.0 0.0 0.0 0.4 3.8 10.5 21.4 34.4 44.7 46.8 41.2 29.6 17.3 7.7 2.1 0.0 0.0 0.0 260.0 Apr 0.0 0.0 0.4 3.6 11.4 25.6 44.7 64.4 79.5 81.5 70.3 52.5 32.1 15.8 5.8 1.1 0.0 0.0 488.9 May 0.0 0.1 2.5 8.6 20.9 40.9 65.1 90.1 106.2 108.4 95.5 73.6 47.7 25.9 11.2 3.6 0.3 0.0 700.5 Jun 0.0 0.5 3.7 11.2 26.1 48.6 77.8 106.8 125.4 130.0 117.6 91.2 61.3 35.5 17.0 6.2 1.3 0.0 860.0 Jul 0.0 0.2 3.1 10.7 26.1 51.1 83.6 117.0 140.6 147.3 134.4 107.1 74.0 41.7 19.5 6.8 1.3 0.0 964.7 Aug 0.0 0.0 1.0 6.5 18.6 39.6 68.2 99.0 119.8 126.4 111.7 85.3 55.3 29.4 11.8 3.0 0.1 0.0 775.8 Sep 0.0 0.0 0.0 2.5 10.4 25.2 47.2 69.7 84.3 86.5 74.0 52.6 30.2 13.1 3.6 0.2 0.0 0.0 499.4 Oct 0.0 0.0 0.0 0.3 3.7 11.2 22.8 35.3 43.7 43.5 35.1 22.6 10.9 3.2 0.2 0.0 0.0 0.0 232.5 Nov 0.0 0.0 0.0 0.0 0.5 3.7 9.0 14.5 18.3 18.2 14.0 8.2 3.0 0.2 0.0 0.0 0.0 0.0 89.6 Dec 0.0 0.0 0.0 0.0 0.0 1.1 4.1 7.6 10.2 10.4 8.1 4.6 1.7 0.0 0.0 0.0 0.0 0.0 47.8 Values in Watt hours/meter^2 per hour Seattle, WA. Daily Average Global Spectral Data UVB 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 ---- 109 ---- 542 624 876 901 751 471 ---- 80 40 ---- 2001 51 75* ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- 2002 ---- ---- ---- ---- ---- 971 1039 859 556 241 99 44 ---- 2003 70 122 237 423 706 953 1130 868 551 232 102 49 456 2004 64 140 310 631 678 986 940 840 448 242 84 48 452 2005 74 169 287 532 734 768 ---- ---- 467 219 79 52 ---- 2006 48 155 269 511 751 904 1009 780 522 250 72 49 445 2007 63 113 233 495 775 860 1001 775 492 204 101 41 431 2008 58 144 253 452 670 801 958 730 529 236 88 47 415 2009 75 162 256 517 824 953 986 720 553 267 ---- ---- ---- 2010 ---- 171* 261 424 588 738 883 638 390 257 86 53 ---- 2011 65 129 217 408 641 727 862 804 514 209 95 54 395 2012 57 121 251 510 718 706 887 810 546 229 87 42 414 2013 69 122 288 431 703 912 975 743 419 222 102 55 422 Average 63 133 260 490 701 858 964 776 497 234 90 48 428 % SD 14 21 10 13 9 12 8 8 11 8 11 11 5 Values in average daily Watt hrs/meter^2 per Day * Less than 15 days of data in month. Univ. of Oregon Solar Radiation Monitoring Lab.