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    Solar Data - Elkins, WV


    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 27.1 29.8 39.6 48.2 57.4 64.8 68.7 67.8 61.8 50.4 41.3 32.0 49.1
    Daily Minimum °F 16.2 18.3 27.1 34.8 44.0 52.0 56.9 56.2 49.9 37.2 29.7 21.3 37.0
    Daily Maximum °F 37.9 41.3 52.1 61.6 70.9 77.6 80.4 79.3 73.6 63.6 52.9 42.6 61.2
    Record High °F -24 -22 -15 3 20 25 32 34 27 11 0 -24 -24
    Record Low °F 76 72 84 89 90 93 99 95 97 86 80 76 99
    Heating Degree Days note a 1175 986 787 504 249 62 11 23 131 458 711 1023 6120
    Cooling Degree Days note a 0 0 0 0 13 56 126 110 35 6 0 0 346
    Average Humidity Ratio note b 0.27% 0.29% 0.39% 0.52% 0.79% 1.08% 1.26% 1.23% 1.01% 0.63% 0.45% 0.34% 0.69%
    Average Wind Speed mph 7.3 7.2 7.9 7.8 6.2 4.9 4.4 4.0 4.3 5.1 6.8 7.1 6.1
    Clearness note c 43% 44% 45% 46% 48% 49% 49% 49% 48% 46% 41% 40% 46%


    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 610 830 1130 1440 1680 1810 1760 1590 1310 980 640 510 1190
    Std Deviation 46 73 85 131 138 111 92 88 97 76 68 37 33
    Minimum 520 680 950 1190 1410 1640 1550 1430 1150 850 520 450 1120
    Maximum 700 990 1290 1790 1890 2100 1910 1770 1510 1210 820 590 1260
    Diffuse 390 510 630 760 860 920 920 810 650 480 380 340 640
    North
    Global 220 290 360 440 530 590 560 480 380 290 220 190 380
    Diffuse 220 290 360 440 500 530 520 460 380 290 220 190 370
    East
    Global 370 490 650 820 920 930 870 800 690 570 390 320 650
    Diffuse 260 340 430 520 590 620 610 550 460 350 260 220 430
    South
    Global 810 890 940 870 780 740 760 870 970 1030 820 710 850
    Diffuse 370 440 490 540 560 580 580 570 520 440 350 320 480
    West
    Global 390 520 680 830 940 1000 970 930 790 620 420 340 700
    Diffuse 260 350 430 530 600 640 630 580 480 360 260 230 450


    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 960 1310 1780 2250 2530 2640 2550 2280 1870 1390 1000 840 1780
    North Global 190 250 330 430 580 680 620 480 360 280 200 170 380
    East Global 710 920 1140 1350 1440 1450 1410 1320 1160 930 730 630 1100
    South Global 1950 1990 1790 1390 1060 900 950 1210 1580 1830 1870 1860 1530
    West Global 710 920 1140 1350 1440 1450 1410 1320 1160 930 730 630 1100


    Average Transmitted Solar Radiation (Btu/sq.ft./day)
      Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Year
    Horizontal
    Unshaded 400 570 800 1030 1210 1310 1270 1150 940 680 430 340 850
    North
    Unshaded 150 200 250 300 360 390 370 320 270 200 150 130 260
    Shaded 130 170 220 270 310 340 330 290 240 180 130 110 230
    East
    Unshaded 260 350 460 580 650 660 610 560 480 400 270 220 460
    Shaded 230 300 400 500 560 560 520 480 410 350 240 190 390
    South
    Unshaded 600 650 650 570 490 460 480 560 660 740 610 530 580
    Shaded 580 590 520 390 350 350 360 380 490 650 580 510 480
    West
    Unshaded 270 370 480 590 660 710 690 660 560 440 290 230 500
    Shaded 240 320 420 510 570 600 590 570 490 390 260 210 430


    Shading Geometry in Dimensionless Units
    Window

    1
    Horizontal Overhang (h):

    0.502
    Verical Gap (v):

    0.315


    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           -12.0 -9.2 -11.4        
    5:00         -8.9 -2.0 0.7 -1.9 -6.8      
    6:00     -6.8 2.7 8.9 10.9 8.8 4.4 -1.0 -6.4    
    7:00 -7.3 -2.9 5.0 14.1 20.2 22.0 19.9 15.8 10.8 5.2 -1.2 -6.2
    8:00 3.4 8.3 16.3 25.7 31.8 33.5 31.4 27.4 22.2 16.1 9.2 4.2
    9:00 12.7 18.4 27.1 37.0 43.4 45.1 43.0 38.9 33.1 26.0 18.3 13.0
    10:00 20.7 27.3 36.7 47.4 54.5 56.5 54.4 49.7 42.8 34.3 25.7 20.3
    11:00 26.5 34.1 44.3 56.0 64.2 67.0 64.7 58.9 50.2 40.1 30.6 25.4
    12:00 29.7 37.9 48.6 60.6 69.7 73.8 71.7 64.5 53.8 42.4 32.5 27.7
    13:00 29.6 38.2 48.4 59.6 67.8 72.2 71.0 63.8 52.5 40.8 31.0 26.9
    14:00 26.4 34.7 44.0 53.3 59.9 63.7 63.3 57.2 46.7 35.5 26.4 23.1
    15:00 20.4 28.3 36.3 44.0 49.4 52.7 52.7 47.5 37.9 27.5 19.3 16.8
    16:00 12.4 19.6 26.6 33.1 38.0 41.2 41.2 36.5 27.5 17.8 10.4 8.6
    17:00 3.1 9.6 15.8 21.7 26.3 29.6 29.6 24.9 16.3 7.0 0.6 -1.1
    18:00 -7.7 -1.4 4.5 10.1 14.8 18.2 18.1 13.3 4.8 -4.5 -10.8 -11.7
    19:00     -7.4 -1.5 3.8 7.3 7.0 2.1 -7.0      
    20:00         -6.8 -3.1 -3.5 -9.1        


    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         53.4 49.7 49.9          
    5:00       69.7 63.6 59.7 60.1 65.8        
    6:00     87.2 79.3 72.8 68.6 69.3 75.4 85.4 95.9    
    7:00 111.3 104.0 96.6 88.6 81.6 77.1 77.9 84.5 94.8 105.3 113.0 115.1
    8:00 120.5 113.6 106.5 98.3 90.6 85.6 86.6 93.9 104.9 115.5 122.9 124.4
    9:00 130.9 124.4 117.7 109.5 101.0 95.1 96.3 104.6 116.5 127.3 134.1 135.0
    10:00 142.9 137.0 131.3 123.7 114.5 107.4 108.6 118.2 131.1 141.6 147.2 147.2
    11:00 156.8 152.1 148.4 143.3 135.3 126.8 127.5 137.7 150.1 158.7 162.3 161.0
    12:00 172.2 169.6 169.3 170.2 169.2 163.4 160.9 166.5 173.8 178.3 178.9 176.2
    13:00 188.4 188.2 192.0 200.1 208.8 211.6 205.5 200.2 198.8 198.0 195.5 191.7
    14:00 203.8 205.9 212.8 224.5 235.9 241.1 236.1 226.9 220.3 215.7 210.9 206.3
    15:00 217.6 221.4 229.6 241.9 252.6 257.2 253.5 244.9 236.8 230.3 224.2 219.3
    16:00 229.5 234.3 243.1 254.8 264.3 268.3 265.3 257.7 249.6 242.5 235.7 230.6
    17:00 239.9 245.3 254.2 265.3 273.9 277.3 274.7 268.0 260.3 252.9 245.6 240.5
    18:00 249.1 255.1 264.1 274.8 282.7 285.8 283.4 277.3 269.9 262.4 254.7 249.4
    19:00     273.5 284.1 291.6 294.3 292.0 286.4 279.4      
    20:00         301.2 303.6 301.3 296.1        


    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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