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    Solar Data - Greensboro, NC


    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 36.7 40.0 48.8 57.6 65.9 73.1 76.9 75.7 69.7 58.6 49.5 40.5 57.8
    Daily Minimum °F 26.6 29.3 37.4 45.6 54.7 62.6 66.9 65.9 59.5 47.2 38.5 30.5 47.1
    Daily Maximum °F 46.7 50.7 60.2 69.6 77.0 83.6 86.9 85.5 79.9 69.9 60.5 50.5 68.4
    Record High °F -8 -4 5 21 32 42 48 45 35 20 10 0 -8
    Record Low °F 78 81 90 94 98 102 102 103 100 95 85 78 103
    Heating Degree Days note a 877 700 502 235 78 6 0 0 16 226 465 760 3865
    Cooling Degree Days note a 0 0 0 13 106 249 369 332 157 27 0 0 1253
    Average Humidity Ratio note b 0.33% 0.35% 0.48% 0.64% 0.97% 1.29% 1.48% 1.45% 1.17% 0.77% 0.55% 0.40% 0.82%
    Average Wind Speed mph 7.7 8.1 8.6 8.3 7.2 6.7 6.2 6.0 6.3 6.5 7.2 7.5 7.2
    Clearness note c 48% 50% 52% 54% 53% 54% 53% 53% 52% 53% 49% 47% 52%


    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 760 1020 1370 1710 1890 1980 1920 1750 1460 1190 840 680 1380
    Std Deviation 58 92 113 134 99 109 134 113 100 108 83 47 34
    Minimum 620 830 1100 1460 1690 1820 1680 1500 1260 970 620 600 1310
    Maximum 880 1200 1590 2060 2120 2230 2160 1960 1630 1400 990 770 1430
    Diffuse 330 420 540 680 820 890 880 790 650 460 350 300 590
    North
    Global 220 280 360 450 550 620 590 490 400 310 240 200 290
    Diffuse 220 280 360 430 500 540 520 470 400 310 240 200 370
    East
    Global 500 640 810 980 1030 1060 1040 960 840 730 540 460 800
    Diffuse 260 340 430 530 600 640 630 580 490 380 290 240 450
    South
    Global 1140 1200 1150 970 790 720 740 880 1040 1240 1180 1110 1010
    Diffuse 360 420 490 530 560 570 570 570 540 470 390 340 480
    West
    Global 510 660 830 990 1030 1060 1030 980 860 750 560 460 810
    Diffuse 270 340 440 540 610 650 640 590 500 390 290 240 460


    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 1070 1410 1860 2280 2530 2610 2530 2290 1920 1480 1100 950 1840
    North Global 200 260 340 430 580 680 630 490 380 300 220 190 390
    East Global 750 960 1160 1340 1410 1410 1370 1290 1160 960 770 690 1110
    South Global 1980 1980 1730 1290 950 810 860 1120 1500 1790 1890 1910 1480
    West Global 750 960 1160 1340 1410 1410 1370 1290 1160 960 770 690 1110


    Average Transmitted Solar Radiation (Btu/sq.ft./day)
      Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Year
    Horizontal
    Unshaded 500 700 970 1240 1370 1440 1400 1270 1050 830 570 450 980
    North
    Unshaded 150 190 250 300 360 400 390 330 280 210 160 140 260
    Shaded 140 180 230 280 330 370 350 300 250 200 150 130 240
    East
    Unshaded 340 450 580 700 730 750 740 680 600 510 380 310 560
    Shaded 320 410 520 630 650 670 650 610 530 470 350 290 510
    South
    Unshaded 850 870 780 610 480 440 450 550 690 880 880 830 690
    Shaded 830 820 640 430 350 360 360 390 530 790 850 820 600
    West
    Unshaded 350 460 590 710 730 750 730 700 610 530 390 320 570
    Shaded 330 420 530 630 650 670 650 620 550 480 360 290 520


    Shading Geometry in Dimensionless Units
    Window

    1

    Horizontal Overhang (h):

    0.423

    Verical Gap (v):

    0.295



    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           -11.1            
    5:00       -9.8 -3.3 -1.1 -3.3 -7.9        
    6:00     -6.9 2.2 8.1 9.8 7.8 3.7 -1.2 -6.0 -11.5  
    7:00 -6.3 -2.1 5.3 14.0 19.8 21.3 19.3 15.5 11.0 6.0 0.4 -4.9
    8:00 4.8 9.4 17.1 26.1 31.8 33.2 31.2 27.6 22.9 17.3 10.7 5.8
    9:00 14.6 20.1 28.4 37.9 43.9 45.3 43.3 39.6 34.4 27.7 20.3 15.0
    10:00 22.9 29.4 38.6 49.0 55.7 57.3 55.3 51.0 44.6 36.5 28.1 22.7
    11:00 29.2 36.6 46.7 58.2 66.1 68.6 66.4 61.0 52.7 42.8 33.4 28.1
    12:00 32.5 40.7 51.4 63.5 72.5 76.6 74.4 67.3 56.7 45.3 35.4 30.6
    13:00 32.4 41.0 51.2 62.2 70.3 74.6 73.5 66.4 55.2 43.5 33.8 29.7
    14:00 29.0 37.3 46.4 55.3 61.4 64.9 64.7 59.1 48.8 37.7 28.9 25.6
    15:00 22.7 30.4 38.1 45.2 50.1 53.3 53.4 48.7 39.4 29.3 21.3 19.0
    16:00 14.2 21.3 27.8 33.8 38.2 41.2 41.4 37.0 28.4 19.0 12.0 10.4
    17:00 4.4 10.8 16.5 21.8 26.1 29.1 29.3 25.0 16.7 7.8 1.6 0.7
    18:00 -6.7 -0.7 4.7 9.8 14.2 17.3 17.4 12.9 4.7 -4.1 -10.1 -10.7
    19:00     -7.6 -2.2 2.8 6.1 6.0 1.3 -7.5      
    20:00         -8.3 -4.7 -5.0 -10.3        


    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           50.1            
    5:00       70.2 63.7 59.7 60.3 66.2        
    6:00     87.5 79.3 72.4 68.2 68.9 75.2 85.4 96.2 104.6  
    7:00 111.6 104.1 96.4 87.9 80.6 76.0 76.9 83.7 94.3 105.1 113.1 115.3
    8:00 120.4 113.2 105.7 97.0 88.9 83.8 84.9 92.4 103.8 114.8 122.5 124.2
    9:00 130.4 123.6 116.4 107.4 98.3 92.3 93.7 102.3 114.9 126.2 133.4 134.5
    10:00 142.3 136.0 129.6 121.0 110.8 103.2 104.8 115.2 129.0 140.3 146.5 146.6
    11:00 156.2 151.2 146.8 140.7 130.8 121.0 122.4 134.3 148.3 157.9 161.8 160.6
    12:00 172.1 169.2 168.7 169.3 167.7 160.2 157.7 165.0 173.4 178.2 178.9 176.2
    13:00 188.6 188.6 192.8 202.0 212.7 217.1 209.8 202.5 200.2 198.9 196.1 192.1
    14:00 204.4 206.9 214.4 227.4 240.3 246.4 241.2 230.4 222.4 217.0 211.7 206.9
    15:00 218.3 222.5 231.4 244.5 255.9 261.0 257.2 247.8 238.8 231.6 225.0 219.9
    16:00 230.1 235.2 244.4 256.7 266.5 270.8 267.8 259.8 251.1 243.4 236.1 231.0
    17:00 240.1 245.8 255.0 266.5 275.3 278.9 276.3 269.4 261.1 253.3 245.7 240.5
    18:00 248.8 255.0 264.3 275.3 283.4 286.7 284.3 278.0 270.2 262.2 254.2 248.9
    19:00     273.2 284.1 291.8 294.6 292.3 286.5 279.0      
    20:00         300.9 303.4 301.2 295.7        


    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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