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ASHRAE
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ASHRAE tables
All data from published tables in BTU & Ft2.
SI conversions by factors shown.
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These tables represent the maximum average solar
energy
that falls on a given area during each
month, at various latitudes in the northern hemisphere at local noon. |
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| Heat Gain per Half Day |
BTU/Ft2 |
latitude -> |
24 deg N. |
32 deg N. |
40 deg N. |
48 deg N. |
56 deg N. |
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Table of published values
in English units
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Date |
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21-Jan |
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1064 |
974 |
903 |
735 |
489 |
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21-Feb |
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1095 |
1091 |
1035 |
936 |
819 |
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21-Mar |
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981 |
1054 |
1100 |
1111 |
1080 |
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21-Apr |
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953 |
965 |
1003 |
1086 |
1144 |
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21-May |
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950 |
983 |
1002 |
1058 |
1120 |
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21-Jun |
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936 |
972 |
1019 |
1098 |
1158 |
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21-Jul |
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933 |
964 |
986 |
1044 |
1101 |
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21-Aug |
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916 |
929 |
961 |
1040 |
1095 |
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21-Sep |
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939 |
1004 |
1045 |
1050 |
1013 |
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21-Oct |
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1050 |
1044 |
989 |
895 |
776 |
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21-Nov |
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1046 |
955 |
884 |
719 |
476 |
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21-Dec |
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1019 |
947 |
831 |
623 |
330 |
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avg |
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990 |
990 |
980 |
950 |
883 |
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Conversion factor: BTU/half-day/ft^2 to KW*Hr/M^2 |
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0.00315459 |
0.00315459 |
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| Heat Gain per Half Day |
kWHr·M-2 |
latitude -> |
24 deg N. |
32 deg N. |
40 deg N. |
48 deg N. |
56 deg N. |
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Converted to SI units
rounded to the nearest watt·hour
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Date |
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21-Jan |
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3.356 |
3.073 |
2.849 |
2.319 |
1.543 |
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21-Feb |
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3.454 |
3.442 |
3.265 |
2.953 |
2.584 |
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21-Mar |
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3.095 |
3.325 |
3.470 |
3.505 |
3.407 |
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21-Apr |
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3.006 |
3.044 |
3.164 |
3.426 |
3.609 |
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21-May |
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2.997 |
3.101 |
3.161 |
3.338 |
3.533 |
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21-Jun |
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2.953 |
3.066 |
3.215 |
3.464 |
3.653 |
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21-Jul |
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2.943 |
3.041 |
3.110 |
3.293 |
3.473 |
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21-Aug |
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2.890 |
2.931 |
3.032 |
3.281 |
3.454 |
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21-Sep |
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2.962 |
3.167 |
3.297 |
3.312 |
3.196 |
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21-Oct |
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3.312 |
3.293 |
3.120 |
2.823 |
2.448 |
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21-Nov |
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3.300 |
3.013 |
2.789 |
2.268 |
1.502 |
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21-Dec |
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3.215 |
2.987 |
2.621 |
1.965 |
1.041 |
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column averages |
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3.124 |
3.124 |
3.091 |
2.996 |
2.787 |
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These tables represent the maximum average solar power that falls on a given area
during each month, at various latitudes in the northern
hemisphere at local noon. |
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| Max Normal Irradiation |
Btu/Hr/ft^2 |
latitude -> |
24 deg N. |
32 deg N. |
40 deg N. |
48 deg N. |
56 deg N. |
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Table of published values in
English units
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Date |
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21-Jan |
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320 |
309 |
293 |
267 |
216 |
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21-Feb |
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323 |
316 |
306 |
291 |
267 |
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21-Mar |
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317 |
312 |
306 |
297 |
284 |
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21-Apr |
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300 |
298 |
294 |
289 |
280 |
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21-May |
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287 |
286 |
284 |
280 |
275 |
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21-Jun |
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280 |
280 |
278 |
275 |
270 |
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21-Jul |
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279 |
278 |
276 |
272 |
267 |
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21-Aug |
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285 |
283 |
279 |
273 |
265 |
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21-Sep |
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301 |
296 |
290 |
280 |
266 |
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21-Oct |
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311 |
304 |
293 |
278 |
252 |
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21-Nov |
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314 |
303 |
287 |
260 |
210 |
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21-Dec |
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317 |
304 |
284 |
250 |
180 |
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avg |
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303 |
297 |
289 |
276 |
253 |
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Conversion factor: BTU/Hr/ft^2 to W/M^2 |
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3.15459757 |
3.15459757 |
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W/M^2 |
latitude -> |
24 deg N. |
32 deg N. |
40 deg N. |
48 deg N. |
56 deg N. |
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Converted to SI units
rounded to the nearest watt·meter2
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Date |
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21-Jan |
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1009 |
975 |
924 |
842 |
681 |
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21-Feb |
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1019 |
997 |
965 |
918 |
842 |
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21-Mar |
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1000 |
984 |
965 |
937 |
896 |
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21-Apr |
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946 |
940 |
927 |
912 |
883 |
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21-May |
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905 |
902 |
896 |
883 |
868 |
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21-Jun |
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883 |
883 |
877 |
868 |
852 |
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21-Jul |
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880 |
877 |
871 |
858 |
842 |
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21-Aug |
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899 |
893 |
880 |
861 |
836 |
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21-Sep |
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950 |
934 |
915 |
883 |
839 |
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21-Oct |
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981 |
959 |
924 |
877 |
795 |
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21-Nov |
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991 |
956 |
905 |
820 |
662 |
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21-Dec |
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1000 |
959 |
896 |
789 |
568 |
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column averages |
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955 |
938 |
912 |
871 |
797 |
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Landmark Cities* |
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Chart Latitude |
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24 N |
32 N |
40 N |
48 N |
56 N |
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Key West,
Florida |
Hilton Head,
South Carolina
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Philadelphia, Pennsylvania |
Caribou,
Maine
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Aleutian Peninsula,
Alaska
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Kilauea Bay, Hawaii
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San Diego,
California
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Kansas City, Kansas |
Intl. Falls,
Minnesota
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Edinburgh, Scotland, UK
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| *landmarks are not part of ASHRAE data |
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...............
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