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    Solar Data - Norfolk, VA


    Average Climate Conditions
    Solar Radiation Data
    Altitude and Azimuth of the Sun


    Average Climate Conditions
        Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Year
    Element
    Units                          
    Average Temperature °F 39.1 41.0 48.6 57.0 66.1 74.1 78.2 77.2 71.9 61.2 52.5 43.8 59.2
    Daily Minimum °F 30.9 32.3 39.3 47.1 56.8 65.2 70.0 69.4 64.2 52.9 43.8 35.4 50.6
    Daily Maximum °F 47.3 49.7 57.9 66.9 75.3 82.9 86.4 85.1 79.6 69.5 61.2 52.2 67.8
    Record High °F -3 8 18 28 36 45 54 49 45 27 20 7 -3
    Record Low °F 78 81 88 97 100 101 103 104 99 95 85 80 104
    Heating Degree Days note a 803 672 508 249 51 0 0 0 11 164 380 657 3495
    Cooling Degree Days note a 0 0 0 9 85 277 409 378 218 46 0 0 1422
    Average Humidity Ratio note b 0.36% 0.38% 0.49% 0.63% 0.94% 1.27% 1.49% 1.49% 1.24% 0.85% 0.61% 0.44% 0.85%
    Average Wind Speed mph 11.5 12.1 12.6 11.9 10.7 10.1 9.2 9.0 9.9 10.4 10.8 11.4 10.8
    Clearness note c 46% 48% 50% 52% 52% 53% 52% 52% 51% 50% 48% 45% 50%


    Note:
    1. Heating and cooling degree days calculated from 65 degree (F) base.
    2. expressed as pounds moisture per pound of air.
    3. Average atmospheric clarity to solar transmission, expressed as a percentage.

    Source:
  • National Renewable Energy Laboratory, Solar Radiation Data Manual for Buildings.


  • Average Incident Solar Radiation (Btu/sq.ft./day)
      Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Year
    Horizontal
    Global 710 960 1290 1630 1830 1950 1860 1710 1420 1100 800 640 1330
    Std Deviation 57 89 92 132 103 105 129 124 88 102 79 42 32
    Minimum 600 760 1080 1370 1580 1780 1640 1460 1230 830 610 550 1270
    Maximum 820 1140 1460 1930 2030 2130 2130 1940 1600 1260 930 710 1390
    Diffuse 310 410 530 670 790 840 840 760 620 460 330 290 570
    North
    Global 210 270 340 440 530 600 570 470 380 300 220 190 380
    Diffuse 210 270 340 430 490 520 510 460 380 300 220 190 360
    East
    Global 470 610 780 940 990 1050 1000 950 820 680 530 430 770
    Diffuse 250 320 420 520 590 620 610 570 480 370 280 230 440
    South
    Global 1080 1140 1090 950 790 720 740 880 1030 1160 1140 1040 980
    Diffuse 340 410 470 520 540 550 550 550 520 450 370 330 470
    West
    Global 480 610 780 920 1000 1040 1000 940 840 680 520 430 770
    Diffuse 250 330 420 520 590 630 610 570 480 370 280 230 440


    Average Clear Day Incident Solar Radiation (Btu/sq.ft./day)
      Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Year
    Horizontal Global 1020 1360 1810 2240 2500 2580 2500 2260 1880 1430 1060 900 1800
    North Global 200 250 330 430 580 670 620 480 370 290 210 180 380
    East Global 750 940 1150 1320 1410 1410 1370 1290 1150 940 750 6700 1100
    South Global 1950 1950 1720 1310 980 830 880 1440 1500 1780 1870 1880 1480
    West Global 750 940 1150 1320 1410 1410 1370 1290 1150 940 750 670 1100


    Average Transmitted Solar Radiation (Btu/sq.ft./day)
      Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Year
    Horizontal
    Unshaded 470 660 920 1180 1330 1420 1360 1240 1020 770 540 410 940
    North
    Unshaded 140 190 240 300 350 390 370 320 270 210 160 130 260
    Shaded 130 170 220 270 320 350 340 290 240 190 140 120 230
    East
    Unshaded 330 430 550 670 700 740 710 670 580 480 370 290 540
    Shaded 300 390 490 600 610 650 620 590 520 430 340 270 480
    South
    Unshaded 810 830 750 600 480 430 450 550 690 820 850 780 670
    Shaded 790 770 610 420 350 350 350 380 520 740 830 770 570
    West
    Unshaded 330 430 550 650 710 730 700 670 590 480 360 300 540
    Shaded 300 390 500 580 620 640 620 590 530 430 330 270 480


    Shading Geometry in Dimensionless Units
    Window

    1

    Horizontal Overhang (h):

    0.446

    Verical Gap (v):

    0.302



    Note:
    • Incident and transmitted radiation values are based on 30-year (1961-1990) averages for each month.
    • For explanation of shading geometry, see solar_shading.asp

    Source:
  • National Renewable Energy Laboratory, Solar Radiation Data Manual for Buildings.


  • Altitude of the Sun
      15-Jan 15-Feb 15-Mar 15-Apr 15-May 15-Jun 15-Jul 15-Aug 15-Sep 15-Oct 15-Nov 15-Dec
    Time of Day
    4:00         -10.9 -8.3 -10.5          
    5:00       -6.8 0.2 2.1 0.2 -5.0 -10.2      
    6:00   -11.4 -4.1 5.0 11.0 12.8 10.7 6.6 2.0 -3.3 -9.0  
    7:00 -4.0 0.8 8.0 16.9 22.7 24.3 22.2 18.4 13.8 8.5 2.5 -2.7
    8:00 6.8 11.7 19.6 28.8 34.7 36.1 34.1 30.3 25.5 19.5 12.6 7.6
    9:00 16.1 21.9 30.5 40.3 46.6 48.1 46.1 42.1 36.5 29.5 21.7 16.4
    10:00 23.9 30.7 40.2 50.9 58.0 59.8 57.8 53.2 46.2 37.6 28.8 23.5
    11:00 29.4 37.1 47.5 59.2 67.6 70.4 68.2 62.3 53.3 43.0 33.3 28.2
    12:00 32.0 40.3 51.0 63.0 72.0 76.4 74.4 67.0 56.0 44.4 34.5 29.8
    13:00 31.1 39.6 49.7 60.3 67.9 72.1 71.3 64.4 53.3 41.7 32.1 28.2
    14:00 27.0 35.2 44.0 52.6 58.5 61.9 61.8 56.3 46.2 35.3 26.6 23.6
    15:00 20.2 27.8 35.3 42.3 47.2 50.3 50.4 45.7 36.6 26.5 18.7 16.5
    16:00 11.5 18.4 24.9 30.8 35.3 38.4 38.5 34.1 25.5 16.1 9.2 7.6
    17:00 1.7 7.8 13.5 19.0 23.3 26.5 26.6 22.1 13.8 4.9 -1.6 -2.7
    18:00 -9.7 -3.7 1.9 7.1 11.6 14.9 14.9 10.2 2.0 -7.1    
    19:00     -10.3 -4.8 0.7 3.9 3.7 -1.5 -10.2      
    20:00         -10.3 -6.5 -7.0          


    Azimuth of the Sun
      15-Jan 15-Feb 15-Mar 15-Apr 15-May 15-Jun 15-Jul 15-Aug 15-Sep 15-Oct 15-Nov 15-Dec
    Time of Day
    4:00         56.3 52.4 52.7          
    5:00       72.3 65.9 61.8 62.4 68.3 78.4      
    6:00   97.4 89.6 81.4 74.5 70.2 71.0 77.3 87.5 98.2 106.4  
    7:00 113.5 106.2 98.6 90.2 82.8 78.2 79.1 86.0 96.7 107.4 115.2 117.3
    8:00 122.7 115.7 108.4 99.7 91.5 86.3 87.4 95.1 106.6 117.6 125.1 126.6
    9:00 133.2 126.6 119.7 110.9 101.8 95.5 96.8 105.7 118.4 129.6 136.5 137.3
    10:00 145.6 139.6 133.8 125.8 115.8 107.9 109.4 119.9 133.7 144.5 150.1 149.9
    11:00 160.0 155.5 152.0 147.4 139.0 129.4 130.1 141.4 154.2 162.7 165.9 164.3
    12:00 176.0 173.8 174.5 177.2 178.9 174.6 170.4 174.1 179.9 183.2 183.0 179.9
    13:00 192.4 193.0 197.9 208.1 219.5 224.6 217.9 209.4 205.5 203.2 199.7 195.6
    14:00 207.7 210.6 218.3 231.2 243.5 249.2 244.4 234.2 226.1 220.3 214.8 210.0
    15:00 221.1 225.4 234.3 247.0 257.8 262.6 259.0 250.2 241.4 234.2 227.6 222.5
    16:00 232.4 237.7 246.7 258.7 268.1 272.2 269.3 261.7 253.2 245.6 238.4 233.3
    17:00 242.2 248.0 257.1 268.3 276.9 280.4 277.8 271.1 263.1 255.4 247.8 242.6
    18:00 250.9 257.2 266.4 277.3 285.2 288.3 285.9 279.8 272.2 264.4    
    19:00     275.4 286.3 293.8 296.6 294.3 288.6 281.4      
    20:00         303.4 305.8 303.5          


    Get the data in CSV format

    Note:
  • Altitude are listed in degrees above the horizon. Azimuth values are listed in degrees, referenced to East of North.
  • Negative values indicate the sun is below the horizon
  • For further information, see solar_alt-az.asp

  • Source:
  • U.S.Naval Observatory.




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