NASA Surface Meteorology and Solar Energy LA VIRGINIA

8/10/2019 NASA Surface Meteorology and Solar Energy LA VIRGINIA

1/9


2/9

Lon 75.53 Average

22-year Average 5.65 6.57 6.88 6.30 5.41 5.16 5.53 5.69 5.77 5.93 5.27 5.11 5.76

Minimum And Maximum Difference From Monthly Averaged Insolation (%)

Lat 4.53Lon 75.53

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

Minimum -16 -15 -14 -9 -18 -16 -12 -15 -13 -12 -29 -17

Maximum 14 7 10 6 17 18 16 19 17 19 19 16

Parameter Def in iti on

Monthly Averaged Diffuse Radiation Incident On A Horizontal Surface (kWh/m2/day)

Lat 4.53

Lon 75.53Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

Annual

Average

22-year Average 1.74 1.67 1.78 1.98 2.05 1.99 1.94 2.05 2.14 1.95 1.90 1.81 1.92Minimum 1.42 1.47 1.46 1.84 1.77 1.72 1.64 1.68 1.83 1.50 1.56 1.54 1.62

Maximum 1.97 2.01 2.11 2.15 2.17 2.09 2.08 2.20 2.28 2.13 2.04 1.96 2.10

22-year AverageK

0.58 0.64 0.65 0.60 0.53 0.52 0.56 0.56 0.55 0.58 0.54 0.54 0.57

Minimum K 0.49 0.55 0.56 0.55 0.43 0.44 0.49 0.47 0.48 0.51 0.38 0.44 0.48

Maximum K 0.67 0.69 0.72 0.64 0.62 0.62 0.65 0.66 0.65 0.69 0.64 0.63 0.66

NOTE:Diffuse radiation, direct normal radiation and tilted surface radiation are not

calculated when the clearness index (K) is below 0.3 or above 0.8.


Monthly Averaged Clear Sky Insolation Incident On A Horizontal Surface

(kWh/m2/day)

Lat 4.53


Annual

Average

22-year

Average6.75 7.20 7.43 7.47 7.14 6.89 6.86 7.21 7.36 7.25 6.86 6.53 7.07


Monthly Averaged Downward Longwave Radiative Flux (kWh/m /day)

Lat 4.53


Annual

Average

22-year Average 9.97 9.80 9.90 10.1 10.3 10.2 10.1 10.1 10.1 10.0 10.0 10.0 10.0

https://eosweb.larc.nasa.gov/sse/text/definitions.html#pct_sky_mnhttps://eosweb.larc.nasa.gov/sse/text/definitions.html#pct_sky_mnhttps://eosweb.larc.nasa.gov/sse/text/definitions.html#exp_difhttps://eosweb.larc.nasa.gov/sse/text/definitions.html#exp_difhttps://eosweb.larc.nasa.gov/sse/text/definitions.html#clr_skyhttps://eosweb.larc.nasa.gov/sse/text/definitions.html#clr_skyhttps://eosweb.larc.nasa.gov/sse/text/definitions.html#lwv_dwnhttps://eosweb.larc.nasa.gov/sse/text/definitions.html#lwv_dwnhttps://eosweb.larc.nasa.gov/sse/text/definitions.html#lwv_dwnhttps://eosweb.larc.nasa.gov/sse/text/definitions.html#clr_skyhttps://eosweb.larc.nasa.gov/sse/text/definitions.html#exp_difhttps://eosweb.larc.nasa.gov/sse/text/definitions.html#pct_sky_mn


3/9

Solar Geometry:

Monthly Averaged Solar Noon (GMT time)

Lat 4.53


Average 0708 0712 0707 0659 0655 0658 0704 0703 0654 0644 0643 0651


Monthly Averaged Daylight Hours (hours)

Lat 4.53


Average 11.8 11.9 12.1 12.2 12.3 12.3 12.3 12.2 12.1 12.0 11.9 11.8


Monthly Averaged Daylight Average Of Hourly Cosine Solar Zenith Angles

(dimensionless)

Lat 4.53


Average 0.56 0.60 0.63 0.58 0.57 0.56 0.57 0.58 0.63 0.61 0.57 0.55


Monthly Averaged Cosine Solar Zenith Angle At Mid-Time Between Sunrise And

Solar Noon (dimensionless)

Lat 4.53Lon 75.53


Average 0.63 0.67 0.69 0.69 0.67 0.66 0.67 0.69 0.70 0.68 0.64 0.62


Monthly Averaged Declination (degrees)

Lat 4.53


Average -20.7 -12.3 -1.8 9.70 18.8 23.0 21.2 13.7 3.09 -8.45 -18.1 -22.8


Monthly Averaged Sunset Hour Angle (degrees)

Lat 4.53Lon 75.53


Average 88.2 89.0 89.8 90.7 91.5 91.9 91.7 91.1 90.2 89.3 88.5 88.0

https://eosweb.larc.nasa.gov/sse/text/definitions.html#sol_noonhttps://eosweb.larc.nasa.gov/sse/text/definitions.html#sol_noonhttps://eosweb.larc.nasa.gov/sse/text/definitions.html#daylighthttps://eosweb.larc.nasa.gov/sse/text/definitions.html#daylighthttps://eosweb.larc.nasa.gov/sse/text/definitions.html#dy_cos_szahttps://eosweb.larc.nasa.gov/sse/text/definitions.html#dy_cos_szahttps://eosweb.larc.nasa.gov/sse/text/definitions.html#cos_zmthttps://eosweb.larc.nasa.gov/sse/text/definitions.html#cos_zmthttps://eosweb.larc.nasa.gov/sse/text/definitions.html#declinathttps://eosweb.larc.nasa.gov/sse/text/definitions.html#declinathttps://eosweb.larc.nasa.gov/sse/text/definitions.html#sunset_h_ahttps://eosweb.larc.nasa.gov/sse/text/definitions.html#sunset_h_ahttps://eosweb.larc.nasa.gov/sse/text/definitions.html#sunset_h_ahttps://eosweb.larc.nasa.gov/sse/text/definitions.html#declinathttps://eosweb.larc.nasa.gov/sse/text/definitions.html#cos_zmthttps://eosweb.larc.nasa.gov/sse/text/definitions.html#dy_cos_szahttps://eosweb.larc.nasa.gov/sse/text/definitions.html#daylighthttps://eosweb.larc.nasa.gov/sse/text/definitions.html#sol_noon


4/9

Monthly Averaged Maximum Solar Angle Relative To The Horizon (degrees)

Lat 4.53


Average 64.6 73.0 83.6 84.8 75.7 71.4 73.3 80.7 88.5 77.0 67.2 62.5


Monthly Averaged Hourly Solar Angles Relative To The Horizon (degrees)

Lat 4.53


0000 GMT n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a

0100 GMT n/a n/a n/a 1.22 2.82 2.37 0.72 0.53 1.91 3.33 2.80 0.44

0200 GMT 10.5 10.6 13.1 15.9 17.0 16.1 14.6 15.0 16.8 18.0 16.9 14.1

0300 GMT 24.2 25.1 28.0 30.7 31.1 29.9 28.6 29.6 31.8 32.7 30.7 27.40400 GMT 37.4 39.3 42.9 45.5 45.1 43.3 42.3 44.1 46.7 47.1 44.0 40.1

0500 GMT 49.6 53.0 57.7 60.2 58.6 56.1 55.6 58.4 61.7 61.0 56.0 51.5

0600 GMT 59.7 65.3 72.1 74.7 70.5 66.8 67.1 72.0 76.6 73.0 65.0 59.9

0700 GMT 64.6 72.8 83.4 84.7 75.6 71.4 73.2 80.7 87.7 76.3 66.8 62.4

0800 GMT 61.6 69.3 75.2 73.7 68.4 66.0 68.4 73.0 73.2 66.9 60.2 57.7

0900 GMT 52.6 58.2 60.9 59.3 56.1 55.0 57.2 59.5 58.3 53.6 49.1 48.1

1000 GMT 40.8 44.9 46.2 44.5 42.4 42.2 44.1 45.2 43.3 39.3 36.2 36.2

1100 GMT 27.7 30.8 31.3 29.8 28.4 28.7 30.4 30.7 28.4 24.7 22.5 23.2

1200 GMT 14.1 16.5 16.4 15.0 14.2 14.9 16.5 16.1 13.4 10.0 8.56 9.80

1300 GMT 0.25 1.95 1.50 0.26 0.09 1.19 2.56 1.60 n/a n/a n/a n/a







2000 GMT n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a2100 GMT n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a



https://eosweb.larc.nasa.gov/sse/text/definitions.html#mx_horizonhttps://eosweb.larc.nasa.gov/sse/text/definitions.html#mx_horizonhttps://eosweb.larc.nasa.gov/sse/text/definitions.html#hor_anghttps://eosweb.larc.nasa.gov/sse/text/definitions.html#hor_anghttps://eosweb.larc.nasa.gov/sse/text/definitions.html#hor_anghttps://eosweb.larc.nasa.gov/sse/text/definitions.html#mx_horizon


5/9

Monthly Averaged Hourly Solar Azimuth Angles (degrees)

Lat 4.53Lon 75.53



0100 GMT n/a n/a n/a 80.4 71.3 67.0 68.7 76.1 86.9 98.6 108 1120200 GMT 112 103 93.0 81.2 71.7 67.2 69.1 76.8 88.0 100 110 114

0300 GMT 115 106 94.5 81.4 70.7 65.9 68.2 76.6 89.0 103 114 118

0400 GMT 120 110 96.7 80.8 67.7 62.2 65.1 75.0 90.2 107 120 125

0500 GMT 130 117 100 78.3 60.5 54.0 58.1 70.7 91.8 116 132 136

0600 GMT 147 133 110 69.4 41.7 35.4 41.5 57.8 95.6 139 155 156

0700 GMT 175 170 165 354 354 358 3.22 3.36 229 197 190 184

0800 GMT 206 215 244 289 313 322 322 303 265 235 219 211

0900 GMT 226 237 258 281 297 304 303 289 268 249 235 227

1000 GMT 237 247 262 279 291 297 295 284 269 255 243 237

1100 GMT 243 252 265 278 289 293 291 283 270 258 248 242

1200 GMT 247 255 266 278 288 292 290 282 272 260 250 245

1300 GMT 249 257 268 279 288 293 291 283 n/a n/a n/a n/a












Parameters for Ti l ted Solar Panels:

Monthly Averaged Radiation Incident On An Equator-Pointed Tilted Surface

(kWh/m2/day)

Lat 4.53


Annual

Average

SSE HRZ 5.65 6.57 6.88 6.30 5.41 5.16 5.53 5.69 5.77 5.93 5.27 5.11 5.76
https://eosweb.larc.nasa.gov/sse/text/definitions.html#azi_anghttps://eosweb.larc.nasa.gov/sse/text/definitions.html#azi_anghttps://eosweb.larc.nasa.gov/sse/text/definitions.html#azi_ang


6/9

K 0.58 0.64 0.65 0.60 0.53 0.52 0.56 0.56 0.55 0.58 0.54 0.54 0.57

Diffuse 1.74 1.67 1.78 1.98 2.05 1.99 1.94 2.05 2.14 1.95 1.90 1.81 1.92

Direct 6.09 7.24 7.25 6.12 4.91 4.73 5.30 5.21 5.13 5.79 5.17 5.23 5.67

Tilt 0 5.59 6.49 6.79 6.21 5.33 5.08 5.44 5.61 5.69 5.86 5.21 5.05 5.69

Tilt 4 5.75 6.62 6.83 6.24 5.39 5.15 5.52 5.65 5.69 5.93 5.33 5.20 5.77

Tilt 19 6.14 6.85 6.73 6.12 5.44 5.26 5.62 5.61 5.50 6.03 5.61 5.58 5.87

Tilt 90 3.82 3.43 2.25 2.11 2.51 2.66 2.70 2.26 1.74 2.78 3.33 3.63 2.77

OPT 6.23 6.86 6.84 6.24 5.45 5.26 5.62 5.67 5.69 6.03 5.65 5.68 5.93

OPT ANG 30.0 21.0 8.00 6.00 14.0 18.0 17.0 10.0 1.00 16.0 26.0 31.0 16.5

NOTE:Diffuse radiation, direct normal radiation and tilted surface radiation are notcalculated when the clearness index (K) is below 0.3 or above 0.8.


Parameters for Sizing Battery or other Energy-storage Systems:

Minimum Available Insolation Over A Consecutive-day Period (%)

Lat 4.53Lon 75.53


Min/1 day 3.18 18.8 9.30 4.12 2.95 3.87 12.4 2.98 2.94 2.86 3.03 3.13

Min/3 day 29.0 32.1 58.0 42.3 25.8 27.3 44.0 27.4 39.8 36.9 10.8 17.8

Min/7 day 43.6 42.2 66.5 67.9 46.8 53.0 64.5 51.6 54.6 52.9 31.2 25.5

Min/14 day 61.2 67.5 82.7 77.5 63.8 71.2 74.5 70.0 59.4 68.4 58.4 38.9

Min/21 day 69.5 79.0 84.8 86.8 79.2 80.6 83.2 79.0 71.2 76.7 61.5 61.4

Min/Month 83.5 84.7 86.4 90.7 81.5 84.1 87.7 85.4 86.8 87.5 70.9 82.5


Parameters for Sizing Surplus-product Storage Systems:

Available Surplus Insolation Over A Consecutive-day Period (%)

Lat 4.53


Max/1 day 131 119 117 126 142 142 134 137 135 129 141 138

Max/3 day 129 118 114 122 136 138 128 133 132 127 139 136

Max/7 day 128 117 112 122 134 137 123 131 129 124 135 130

Max/14 day 119 114 111 121 130 130 118 125 127 122 130 128

Max/21 day 115 110 110 115 125 128 116 123 123 121 125 125

Max/Month 114 107 110 106 117 118 116 119 117 119 119 116
https://eosweb.larc.nasa.gov/sse/text/definitions.html#ret_tlt0https://eosweb.larc.nasa.gov/sse/text/definitions.html#ret_tlt0https://eosweb.larc.nasa.gov/sse/text/definitions.html#mnavail1https://eosweb.larc.nasa.gov/sse/text/definitions.html#mnavail1https://eosweb.larc.nasa.gov/sse/text/definitions.html#mnavail1https://eosweb.larc.nasa.gov/sse/text/definitions.html#ret_tlt0


7/9


Cloud I nformation:

Monthly Averaged Daylight Cloud Amount (%)

Lat 4.53


Annual

Average

22-year Average 57.9 42.9 43.6 55.3 69.8 73.8 72.4 71.6 70.4 61.9 61.9 63.1 62.2


Meteorology (Temperature):

Monthly Averaged Air Temperature At 10 m Above The Surface Of The Earth (C)

Lat 4.53

Lon 75.53

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov DecAnnual

Average22-year Average 26.9 26.7 27.0 27.5 27.9 27.4 26.9 26.7 26.9 26.8 26.7 26.9 27.0

Minimum 26.1 26.0 26.2 26.8 27.2 26.7 26.2 26.1 26.2 26.1 26.0 26.2 26.3

Maximum 27.6 27.5 27.8 28.3 28.6 28.0 27.6 27.4 27.5 27.4 27.4 27.7 27.7


Air Temperature At 10 m Above The Surface That Has Been Adjusted For A Site

Elevation Of 15 m (C)

Lat 4.53Lon 75.53

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov DecAnnualAverage

22-year

Average26.5 26.4 26.7 27.1 27.5 27.0 26.6 26.4 26.5 26.4 26.3 26.5 26.6

Minimum 26.0 25.8 26.1 26.6 27.1 26.5 26.1 25.9 26.1 26.0 25.9 26.0 26.2

Maximum 26.5 26.4 26.7 27.2 27.5 26.9 26.5 26.3 26.5 26.3 26.3 26.6 26.7


Monthly Averaged Cooling Degree Days Above 18 C

Lat 4.53


Annual

Sum

22-year Average 275 247 281 286 308 281 277 271 267 272 262 277 3304


Monthly Averaged Heating Degree Days Below 18 C

Lat 4.53Lon 75.53

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov DecAnnualSum
https://eosweb.larc.nasa.gov/sse/text/definitions.html#surplus1https://eosweb.larc.nasa.gov/sse/text/definitions.html#surplus1https://eosweb.larc.nasa.gov/sse/text/definitions.html#day_cldhttps://eosweb.larc.nasa.gov/sse/text/definitions.html#day_cldhttps://eosweb.larc.nasa.gov/sse/text/definitions.html#T10Mhttps://eosweb.larc.nasa.gov/sse/text/definitions.html#T10Mhttps://eosweb.larc.nasa.gov/sse/text/definitions.html#T10MChttps://eosweb.larc.nasa.gov/sse/text/definitions.html#T10MChttps://eosweb.larc.nasa.gov/sse/text/definitions.html#CDD18https://eosweb.larc.nasa.gov/sse/text/definitions.html#CDD18https://eosweb.larc.nasa.gov/sse/text/definitions.html#CDD18https://eosweb.larc.nasa.gov/sse/text/definitions.html#T10MChttps://eosweb.larc.nasa.gov/sse/text/definitions.html#T10Mhttps://eosweb.larc.nasa.gov/sse/text/definitions.html#day_cldhttps://eosweb.larc.nasa.gov/sse/text/definitions.html#surplus1


8/9

22-year Average 0 0 0 0 0 0 0 0 0 0 0 0 0


Meteorology (Wind):

Monthly Averaged Wind Speed At 50 m Above The Surface Of The Earth (m/s)

Lat 4.53


Annual

Average

10-year Average 5.38 4.49 3.60 4.01 6.40 6.31 5.13 5.14 5.74 5.48 4.41 4.74 5.07

Minimum And Maximum Difference From Monthly Averaged Wind Speed At 50 m

(%)

Lat 4.53


Annual

Average

Minimum -19 -19 -25 -26 -36 -12 -23 -16 -28 -17 -25 -18 -22

Maximum 28 23 24 41 18 12 27 21 14 16 24 35 24

I t is recommended that users of these wind

data review the SSEMethodology.The

user may wish to correct for bi ases as well

as local effects within the selected gri d

region.

Al l height measurements are from the soil ,

water, or i ce/snow sur face instead of

" eff ective" sur face, which is usuall y taken

to be near the tops of vegetated canopies.

Parameter Defin iti on Units Conversion Chart

Difference Between The Average Wind Speed At 10 m Above The Surface Of TheEarth And The Average Wind speed At 50 m Above The Surface Of The Earth (%)

Vegetation type Crop: 20-m broadleaf-deciduous trees (10%) & wheat

Lat 4.53Lon 75.53


10-yearAverage

-36 -37 -31 -43 -43 -43 -43 -43 -43 -41 -38 -37 -40


Meteorology (Other):

Monthly Averaged Relative Humidity (%)

Lat 4.53


Annual

Average

22-year Average 75.3 75.4 76.7 78.8 77.5 76.5 76.3 77.8 77.5 78.7 79.3 77.2 77.3

https://eosweb.larc.nasa.gov/sse/text/definitions.html#HDD18https://eosweb.larc.nasa.gov/sse/text/definitions.html#HDD18https://eosweb.larc.nasa.gov/cgi-bin/sse/[email protected]+s06#s06https://eosweb.larc.nasa.gov/cgi-bin/sse/[email protected]+s06#s06https://eosweb.larc.nasa.gov/cgi-bin/sse/[email protected]+s06#s06https://eosweb.larc.nasa.gov/sse/text/definitions.html#pct50m_mnhttps://eosweb.larc.nasa.gov/sse/text/definitions.html#pct50m_mnhttps://eosweb.larc.nasa.gov/sse/text/wnd_spd.htmlhttps://eosweb.larc.nasa.gov/sse/text/wnd_spd.htmlhttps://eosweb.larc.nasa.gov/sse/text/definitions.html#pct10m_wndhttps://eosweb.larc.nasa.gov/sse/text/definitions.html#pct10m_wndhttps://eosweb.larc.nasa.gov/sse/text/definitions.html#RH10Mhttps://eosweb.larc.nasa.gov/sse/text/definitions.html#RH10Mhttps://eosweb.larc.nasa.gov/sse/text/definitions.html#RH10Mhttps://eosweb.larc.nasa.gov/sse/text/definitions.html#pct10m_wndhttps://eosweb.larc.nasa.gov/sse/text/wnd_spd.htmlhttps://eosweb.larc.nasa.gov/sse/text/definitions.html#pct50m_mnhttps://eosweb.larc.nasa.gov/cgi-bin/sse/[email protected]+s06#s06https://eosweb.larc.nasa.gov/sse/text/definitions.html#HDD18


9/9

Monthly Averaged Atmospheric Pressure (kPa)

Lat 4.53Lon 75.53


22-year Average 101 101 101 100 100 100 101 101 101 101 101 101 101


Atmospheric Pressure That Has Been Adjusted For A Site Elevation Of 15 m (kPa)

Lat 4.53Lon 75.53


22-year Average 100 100 100 100 100 100 100 100 100 100 100 100 100


Monthly Averaged Precipitation (mm/day)

Lat 4.53

Lon 75.53 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov DecAnnual

Average

22-year Average 3.19 1.66 1.68 3.49 5.47 5.26 4.80 4.70 5.27 4.76 5.87 5.11 4.28


Supporting I nformation:

Monthly Averaged Top-of-atmosphere Insolation (kWh/m /day)

Lat 4.53


Annual

Average

22-year Average 9.59 10.1 10.4 10.3 10.0 9.77 9.86 10.1 10.3 10.1 9.68 9.38 9.99


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NASA Surface Meteorology and Solar Energy LA VIRGINIA

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