Portland-PSU, OR. Diffuse Values Portland-PSU, OR. Hourly Average Diffuse Values For 2004 to 2010 Latitude: 45.51 degrees Longitude: 122.69 degrees Altitude: 70 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 1 23 60 92 113 111 103 80 49 15 0 0 0 0 648 Feb 0 0 0 0 14 60 108 140 161 168 152 130 95 51 10 0 0 0 1088 Mar 0 0 0 9 53 114 167 202 215 216 202 184 144 91 40 3 0 0 1640 Apr 0 0 8 50 111 171 217 248 263 262 245 220 172 127 77 24 1 0 2195 May 0 3 33 84 147 196 227 257 274 279 261 234 195 145 100 52 9 0 2495 Jun 0 6 41 90 148 202 237 256 267 274 255 224 193 151 111 64 20 1 2540 Jul 0 3 30 74 123 160 186 202 206 196 179 156 138 114 85 53 18 0 1922 Aug 0 0 12 52 102 152 183 200 212 197 177 157 127 103 72 34 4 0 1783 Sep 0 0 1 25 76 125 163 179 179 169 160 140 113 77 36 5 0 0 1449 Oct 0 0 0 6 43 92 137 168 172 167 148 121 81 38 5 0 0 0 1176 Nov 0 0 0 0 12 48 88 114 128 124 104 80 42 9 0 0 0 0 750 Dec 0 0 0 0 2 23 57 85 100 97 83 65 31 4 0 0 0 0 548 Values in Watt hours/meter^2 per hour Portland-PSU, OR. Daily Average Diffuse Values For 2004 to 2010 Latitude: 45.51 degrees Longitude: 122.69 degrees Altitude: 70 meters Year\Mth Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Yearly 2004 ---- 1.42* 1.74 2.03 2.84 2.14 2.09 1.76 1.71 1.08 0.83 0.59* ---- 2005 0.80 0.89 1.51 2.23 2.59 2.83 1.83 1.49 1.26 1.34 0.70 0.51 1.50 2006 0.60 1.10 1.72 2.04 2.30 2.57 1.75 1.78 1.32 1.07 0.71 0.68 1.47 2007 0.63 1.06 1.57 2.34 2.66 2.84 2.15 1.83 1.45 1.25 0.73 0.53 1.59 2008 0.62 1.15 1.76 2.37 2.38 2.28 1.98 1.96 1.32 1.21 0.75 0.55 1.52 2009 0.69 1.10 1.62 2.15 2.01 2.65 1.86 1.93 1.57 1.23 0.80 0.49 1.51 2010 0.61 1.16* 1.54 ---- 2.79 2.45 1.81 1.75 1.57 1.04 0.74 0.52 ---- Average 0.66 1.13 1.64 2.19 2.51 2.54 1.92 1.78 1.46 1.18 0.75 0.55 1.53 % SD 12 14 6 7 12 10 8 9 11 10 6 11 3 Values in average daily KWhr/meter^2 per Day * Less than 15 days of data in month. Univ. of Oregon Solar Radiation Monitoring Lab.