Eugene, OR. Total Ground Reflected Irradiance Data Eugene, OR. Hourly Average Total Ground Reflected Irradiance Data For 1998 to 2018 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 14 14 11 7 4 1 0 0 0 0 71 Feb 0 0 0 0 2 6 12 18 21 22 19 14 8 3 0 0 0 0 126 Mar 0 0 0 1 7 14 22 26 30 31 29 23 17 9 3 0 0 0 212 Apr 0 0 1 7 17 27 35 42 45 46 44 36 29 18 9 2 0 0 357 May 0 0 5 13 23 33 42 49 53 55 54 47 39 27 15 6 0 0 462 Jun 0 1 7 16 25 36 46 53 57 59 59 54 45 34 21 10 1 0 523 Jul 0 0 7 17 28 41 53 61 67 69 69 61 51 39 23 10 1 0 599 Aug 0 0 3 11 23 36 48 57 63 65 63 54 44 29 14 4 0 0 514 Sep 0 0 0 6 16 27 37 45 49 50 46 37 27 14 5 0 0 0 361 Oct 0 0 0 1 7 14 21 26 29 29 24 16 9 3 0 0 0 0 180 Nov 0 0 0 0 1 6 10 14 16 15 11 6 3 1 0 0 0 0 82 Dec 0 0 0 0 0 3 7 10 12 11 8 5 2 0 0 0 0 0 59 Values in Watt hours/meter^2 per hour Eugene, OR. Daily Average Total Ground Reflected Irradiance Data For 1998 to 2018 Latitude: 44.05 degrees Longitude: 123.07 degrees Altitude: 150 meters 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 2011 72 124 145 306 396 457 543 504 363 139 75 53 266 2012 64 104 185 290 485 429 511 556 407 194 83 55 281 2013 70 121 247 394 495 567 676 453 272 196 89 121 310 2014 69 137 240 404 523 556 579 509 357 183 80 54 308 2015 74 141 261 409 457 624 608 494 362 197 87 53 315 2016 68 128 206 420 481 576 576 566 355 132 100 57 306 2017 109 125 182 348 560 562 712 565 335 220 80 67 323 2018 75 142 251 360 511 615 669 515 384 200 96 56 324 Average 71 126 212 360 463 524 599 513 361 179 81 59 296 % SD 19 14 15 13 14 10 9 10 11 13 12 27 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.