Eugene, OR. Total Ground Reflected Irradiance Data Eugene, OR. Hourly Average Total Ground Reflected Irradiance Data For 1998 to 2010 Latitude: 44.05 degrees Longitude: 123.07 degrees Altitude: 150 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 3 7 11 13 13 11 7 3 1 0 0 0 0 69 Feb 0 0 0 0 2 6 13 18 20 21 19 14 8 3 0 0 0 0 125 Mar 0 0 0 1 7 14 22 27 29 30 28 23 16 9 3 0 0 0 209 Apr 0 0 1 8 17 27 34 40 44 45 42 35 29 18 9 2 0 0 352 May 0 0 5 13 23 33 41 48 51 53 51 45 36 26 15 6 0 0 447 Jun 0 1 7 15 25 35 45 51 55 57 57 52 43 33 21 10 2 0 509 Jul 0 0 7 17 29 41 53 60 66 68 68 60 49 38 23 11 1 0 592 Aug 0 0 3 12 24 36 47 57 62 64 62 53 43 30 15 5 0 0 511 Sep 0 0 0 6 17 28 38 45 49 50 47 38 27 15 5 0 0 0 365 Oct 0 0 0 1 7 14 21 26 29 28 24 16 9 3 0 0 0 0 178 Nov 0 0 0 0 1 5 10 14 15 14 10 6 3 1 0 0 0 0 79 Dec 0 0 0 0 0 3 6 10 11 11 8 4 2 0 0 0 0 0 55 Values in Watt hours/meter^2 per hour Eugene, OR. Daily Average Total Ground Reflected Irradiance Data For 1998 to 2010 Latitude: 44.05 degrees Longitude: 123.07 degrees Altitude: 150 meters Year\Mth Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Yearly 1998 ---- ---- ---- 462* 296 485 534 545 371 158 74 58 ---- 1999 70 98 197 382 461 508 561 418 433 218 86 63 292 2000 56 98 233 355 421 575 543 591 343 173 89 49 294 2001 70 128 191 313 552 470 569 463 362 168 76 57 286 2002 60 153 221 346 455 510 595 533 362 187 92 44 297 2003 62 134 171 277 461 562 660 505 340 168 75 55 290 2004 80 111 260 396 395 491 603 442 325 177 91 52 286 2005 77 154 232 327 369 478 614 584 419 183 69 51 297 2006 49 156 206 385 515 527 597 577 398 208 59 61 312 2007 93 104 229 380 517 540 558 514 376 164 79 46 301 2008 71 128 193 318 430 515 622 471 390 169 76 77 289 2009 82 124 175 349 521 482 590 452 342 170 80 55 286 2010 57 114 206 335 412 466 649 517 286 165 71 48 278 Average 69 125 209 356 447 508 592 509 365 178 78 55 292 % SD 18 17 13 13 16 7 7 11 11 10 12 16 3 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.