Masters G.M. Renewable and Efficient Electric Power Systems
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628 MONTHLY CLEAR-SKY INSOLATION TABLES
Daily Clear-Sky Insolation (kWh/m
2
) Latitude 55
◦
N
Azimuth: South SE, SW East, West Tracking
Tilt: 0 20 30 40 50 60 90 20 30 40 50 60 90 20 30 40 50 60 90 1-Axis 2-Axis
Jan 0.99 2.11 2.58 2.98 3.29 3.51 3.52 1.77 2.08 2.34 2.53 2.64 2.52 0.98 0.99 0.98 0.97 0.95 0.74 3.76 3.96
Feb 2.26 3.75 4.34 4.81 5.14 5.31 4.91 3.28 3.66 3.94 4.12 4.17 3.62 2.21 2.19 2.16 2.10 2.01 1.54 6.21 6.29
Mar 4.05 5.51 6.02 6.36 6.51 6.47 5.27 5.04 5.35 5.51 5.56 5.45 4.30 3.92 3.81 3.71 3.56 3.36 2.46 8.43 8.43
Apr 6.11 7.13 7.35 7.35 7.15 6.76 4.56 6.77 6.88 6.84 6.62 6.28 4.42 5.86 5.65 5.39 5.10 4.75 3.32 10.03 10.31
May 7.41 7.98 7.94 7.67 7.18 6.53 3.70 7.70 7.60 7.35 6.93 6.40 4.05 7.03 6.68 6.29 5.84 5.33 3.53 10.16 10.95
Jun 7.80 8.19 8.05 7.67 7.09 6.35 3.37 7.95 7.77 7.42 6.93 6.32 3.84 7.38 6.98 6.52 6.01 5.44 3.52 9.95 10.99
July 7.34 7.88 7.83 7.55 7.07 6.42 3.62 7.61 7.50 7.25 6.82 6.29 3.97 6.97 6.62 6.22 5.77 5.26 3.47 9.90 10.70
Aug 5.98 6.94 7.13 7.13 6.92 6.53 4.39 6.60 6.68 6.63 6.41 6.07 4.24 5.73 5.51 5.25 4.95 4.60 3.19 9.54 9.83
Sept 3.96 5.31 5.77 6.06 6.19 6.14 4.97 4.86 5.14 5.28 5.30 5.18 4.05 3.82 3.71 3.60 3.44 3.23 2.34 7.89 7.89
Oct 2.12 3.47 4.00 4.42 4.72 4.88 4.51 3.04 3.38 3.64 3.79 3.83 3.32 2.07 2.04 2.01 1.94 1.85 1.40 5.63 5.70
Nov 0.94 1.96 2.39 2.75 3.04 3.23 3.24 1.64 1.93 2.16 2.34 2.44 2.33 0.92 0.93 0.92 0.91 0.88 0.68 3.45 3.63
Dec 0.60 1.42 1.78 2.09 2.33 2.51 2.58 1.17 1.41 1.62 1.77 1.87 1.85 0.59 0.59 0.59 0.59 0.57 0.44 2.60 2.79
kWh/m
2
-yr 1511 1878 1984 2034 2026 1965 1477 1749 1808 1826 1799 1732 1293 1447 1393 1330 1255 1165 811 2664 2784
Daily Clear-Sky Insolation (kWh/m
2
) Latitude 60
◦
N
Azimuth: South SE, SW East, West Tracking
Tilt: 0 20 30 40 50 60 90 20 30 40 50 60 90 20 30 40 50 60 90 1-Axis 2-Axis
Jan 0.45 1.15 1.46 1.72 1.93 2.09 2.18 0.94 1.15 1.32 1.46 1.55 1.56 0.45 0.45 0.46 0.46 0.45 0.36 2.22 2.33
Feb 1.59 2.91 3.46 3.91 4.24 4.45 4.29 2.50 2.87 3.15 3.34 3.43 3.12 1.58 1.58 1.58 1.55 1.52 1.20 5.14 5.21
Mar 3.40 4.90 5.45 5.84 6.07 6.12 5.24 4.42 4.77 5.00 5.11 5.08 4.19 3.32 3.27 3.20 3.13 2.97 2.27 7.86 7.86
Apr 5.62 6.78 7.08 7.18 7.08 6.78 4.86 6.39 6.57 6.61 6.48 6.22 4.58 5.41 5.25 5.06 4.81 4.54 3.28 9.84 10.12
May 7.06 7.82 7.87 7.70 7.31 6.73 4.14 7.48 7.45 7.28 6.94 6.47 4.30 6.69 6.38 6.03 5.64 5.20 3.52 10.06 10.85
Jun 7.51 8.09 8.04 7.77 7.29 6.60 3.80 7.80 7.67 7.40 6.99 6.44 4.09 7.10 6.71 6.30 5.85 5.33 3.51 9.87 10.91
July 7.00 7.72 7.76 7.58 7.19 6.61 4.05 7.40 7.36 7.17 6.83 6.36 4.20 6.64 6.32 5.97 5.58 5.13 3.46 9.80 10.60
Aug 5.51 6.59 6.87 6.95 6.84 6.54 4.67 6.22 6.37 6.40 6.25 5.99 4.38 5.29 5.12 4.93 4.68 4.40 3.15 9.34 9.62
Sept 3.32 4.69 5.19 5.54 5.74 5.77 4.90 4.26 4.57 4.76 4.85 4.80 3.92 3.23 3.18 3.09 3.01 2.85 2.14 7.31 7.31
Oct 1.46 2.62 3.11 3.50 3.79 3.97 3.83 2.26 2.58 2.82 2.99 3.07 2.78 1.44 1.43 1.43 1.39 1.35 1.05 4.52 4.57
Nov 0.41 1.02 1.29 1.52 1.70 1.84 1.91 0.83 1.02 1.17 1.29 1.37 1.37 0.41 0.41 0.41 0.41 0.40 0.31 1.94 2.04
Dec 0.17 0.53 0.69 0.83 0.95 1.04 1.11 0.42 0.53 0.63 0.71 0.76 0.79 0.17 0.18 0.18 0.18 0.18 0.14 1.07 1.15
kWh/m
2
-yr 1327 1670 1774 1828 1830 1780 1366 1552 1612 1635 1620 1569 1195 1273 1228 1179 1119 1046 743 2404 2514
APPENDIX E
SOLAR INSOLATION TABLES BY CITY
Fairbanks, AK Latitude 64.82
◦
N
Tilt Jan Feb Mar Apr May Jun July Aug Sept Oct Nov Dec Year
Lat − 15 0.7 2.2 4.5 5.6 5.7 5.7 5.4 4.5 3.4 1.9 1.0 0.2 3.4
Lat 0.7 2.4 4.7 5.6 5.3 5.2 4.9 4.2 3.4 2.0 1.1 0.3 3.3
Lat + 15 0.8 2.5 4.7 5.3 4.6 4.5 4.3 3.8 3.2 2.0 1.1 0.3 3.1
90 0.8 2.5 4.5 4.9 4.1 3.9 3.7 3.3 3.0 2.0 1.1 0.3 2.8
1-Axis (Lat) 0.8 2.7 5.8 7.7 8.0 8.0 7.4 5.8 4.4 2.3 1.2 0.3 4.5
Temp. (
◦
C) −18.7 −13.8 −4.6 5.0 15.2 21.2 22.4 19.1 12.7 0.0 −11.7 −16.8 2.5
Montgomery, AL Latitude 32.30
◦
N
Tilt Jan Feb Mar Apr May Jun July Aug Sept Oct Nov Dec Year
Lat − 15 3.4 4.2 5.0 5.9 6.2 6.3 6.0 5.9 5.3 4.9 3.8 3.3 5.0
Lat 3.8 4.6 5.2 5.8 5.8 5.8 5.6 5.7 5.4 5.3 4.3 3.7 5.1
Lat + 15 4.0 4.7 5.1 5.4 5.2 5.1 4.9 5.2 5.2 5.4 4.5 4.0 4.9
90 3.5 3.7 3.4 2.9 2.3 2.1 2.2 2.6 3.2 4.0 3.8 3.5 3.1
1-Axis (Lat) 4.5 5.5 6.5 7.5 7.6 7.5 7.0 7.1 6.7 6.5 5.1 4.4 6.3
Temp. (
◦
C) 13.5 16.0 20.3 24.7 28.3 31.9 32.8 32.4 30.6 25.7 20.4 15.7 24.3
Radiation data measured in kWh/m
2
-day, average daily maximum temperature (
◦
C).
Renewable and Efficient Electric Power Systems. By Gilbert M. Masters
ISBN 0-471-28060-7
2004 John W iley & Sons, Inc.
629
630 SOLAR INSOLATION TABLES BY CITY
Phoenix, AZ Latitude 33.43
◦
N
Tilt Jan Feb Mar Apr May Jun July Aug Sept Oct Nov Dec Year
Lat − 15 4.4 5.4 6.4 7.5 8.0 8.1 7.5 7.3 6.8 6.0 4.9 4.2 6.4
Lat 5.1 6.0 6.7 7.4 7.5 7.3 6.9 7.1 7.0 6.5 5.6 4.9 6.5
Lat + 15 5.5 6.2 6.6 6.9 6.6 6.3 6.0 6.4 6.7 6.7 5.9 5.3 6.3
90 4.9 5.0 4.5 3.7 2.7 2.3 2.4 3.1 4.2 5.1 5.1 4.8 4.0
1-Axis (Lat) 6.2 7.5 8.7 10.3 10.7 10.8 9.6 9.6 9.3 8.4 6.8 5.8 8.6
Temp. (
◦
C) 18.8 21.5 24.2 29.2 34.2 39.7 41.1 39.8 36.8 31.2 23.8 19.0 29.9
Tucson, AZ Latitude 32.12
◦
N
Tilt Jan Feb Mar Apr May Jun July Aug Sept Oct Nov Dec Year
Lat − 15 4.6 5.5 6.4 7.5 7.8 7.8 6.9 6.6 6.6 6.1 5.0 4.3 6.3
Lat 5.4 6.2 6.7 7.3 7.3 7.1 6.4 6.6 6.8 6.6 5.8 5.1 6.5
Lat + 15 5.9 6.4 6.6 6.8 6.4 6.1 5.6 6.0 6.6 6.8 6.2 5.6 6.3
90 5.2 5.1 4.4 3.5 2.5 2.1 2.2 2.8 4.0 5.1 5.3 5.1 3.9
1-Axis (Lat) 6.7 7.8 9.0 10.4 10.7 10.6 8.8 9.1 9.1 8.6 7.3 6.2 8.7
Temp. (
◦
C) 17.7 19.9 22.7 27.3 32.2 37.6 37.4 36.0 34.1 29.1 22.6 17.9 27.9
Daggett, CA Latitude 34.87
◦
N
Tilt Jan Feb Mar Apr May Jun July Aug Sept Oct Nov Dec Year
Lat − 15 4.6 5.4 6.5 7.5 7.9 8.1 7.8 7.6 7.1 6.2 5.0 4.4 6.5
Lat 5.3 6.0 6.8 7.4 7.4 7.4 7.2 7.3 7.3 6.8 5.8 5.2 6.6
Lat + 15 5.7 6.2 6.7 6.8 6.5 6.3 6.2 6.6 7.0 6.9 6.2 5.6 6.4
90 5.2 5.1 4.7 3.8 2.8 2.4 2.5 3.3 4.4 5.4 5.4 5.2 4.2
1-Axis (Lat) 6.5 7.5 9.0 10.3 10.9 11.2 10.7 10.6 10.1 8.8 7.2 6.3 9.1
Temp. (
◦
C) 15.9 18.9 21.4 25.6 30.8 36.6 39.9 38.6 34.3 28.2 20.8 15.8 27.2
Fresno, CA Latitude 36.77
◦
N
Tilt Jan Feb Mar Apr May Jun July Aug Sept Oct Nov Dec Year
Lat − 15 2.8 4.1 5.5 6.8 7.6 7.8 7.9 7.5 6.8 5.5 3.6 2.5 5.7
Lat 3.1 4.4 5.7 6.7 7.1 7.2 7.3 7.3 6.9 6.0 4.1 2.8 5.7
Lat + 15 3.2 4.5 5.6 6.2 6.3 6.1 6.3 6.6 6.7 6.1 4.2 3.0 5.4
90 2.8 3.7 4.0 3.6 3.0 2.6 2.7 3.5 4.4 4.8 3.7 2.6 3.4
1-Axis (Lat) 3.4 5.2 7.2 8.9 10.1 10.5 10.8 10.3 9.2 7.4 4.7 3.1 7.6
Temp. (
◦
C) 12.3 16.5 19.2 23.9 29.0 33.7 37.0 35.9 32.3 26.5 18.2 12.1 24.7
Los Angeles, CA Latitude 33.93
◦
N
Tilt Jan Feb Mar Apr May Jun July Aug Sept Oct Nov Dec Year
Lat − 15 3.8 4.5 5.5 6.4 6.4 6.4 7.1 6.8 5.9 5.0 4.2 3.6 5.5
Lat 4.4 5.0 5.7 6.3 6.1 6.0 6.6 6.6 6.0 5.4 4.7 4.2 5.6
Lat + 15 4.7 5.1 5.6 5.9 5.4 5.2 5.8 6.0 5.7 5.5 5.0 4.5 5.4
90 4.1 4.1 3.8 3.3 2.5 2.2 2.4 3.0 3.6 4.2 4.3 4.1 3.5
1-Axis (Lat) 5.1 6.0 7.1 8.2 7.8 7.7 8.7 8.4 7.4 6.6 5.6 4.9 7.0
Temp. (
◦
C) 18.7 18.8 18.6 19.7 20.6 22.2 24.1 24.8 24.8 23.6 21.3 18.8 21.3
Radiation data measured in kWh/m
2
-day, average daily maximum temperature (
◦
C).
SOLAR INSOLATION TABLES BY CITY 631
San Diego, CA Latitude 32.73
◦
N
Tilt Jan Feb Mar Apr May Jun July Aug Sept Oct Nov Dec Year
Lat − 15 4.1 4.8 5.6 6.4 6.3 6.3 6.8 6.7 6.0 5.3 4.5 3.9 5.6
Lat 4.7 5.3 5.8 6.3 5.9 5.8 6.4 6.5 6.1 5.7 5.1 4.6 5.7
Lat + 15 5.1 5.5 5.7 5.9 5.2 5.1 5.6 5.9 5.8 5.8 5.4 5.0 5.5
90 4.5 4.3 3.9 3.2 2.4 2.1 2.2 2.9 3.6 4.4 4.6 4.5 3.5
1-Axis (Lat) 5.7 6.5 7.4 8.2 7.5 7.4 8.4 8.4 7.7 7.1 6.2 5.5 7.2
Temp. (
◦
C) 18.8 19.2 19.1 20.2 20.6 22.0 24.6 25.4 25.1 23.7 21.1 18.9 21.6
Santa Maria, CA Latitude 34.90
◦
N
Tilt Jan Feb Mar Apr May Jun July Aug Sept Oct Nov Dec Year
Lat − 15 4.0 4.7 5.7 6.6 7.0 7.2 7.4 7.1 6.3 5.4 4.4 3.9 5.8
Lat 4.6 5.2 5.9 6.5 6.6 6.6 6.9 6.9 6.4 5.8 5.0 4.5 5.9
Lat + 15 4.9 5.4 5.8 6.0 5.8 5.7 6.0 6.2 6.2 6.0 5.3 4.9 5.7
90 4.4 4.4 4.0 3.4 2.7 2.3 2.5 3.2 3.9 4.6 4.6 4.5 3.7
1-Axis (Lat) 5.5 6.4 7.5 8.6 8.8 9.0 9.2 8.9 8.2 7.3 6.0 5.4 7.6
Temp. (
◦
C) 17.7 18.2 17.9 19.4 19.9 21.7 22.9 23.4 23.8 23.3 20.4 17.9 20.6
Alamosa, CO Latitude 37.45
◦
N
Tilt Jan Feb Mar Apr May Jun July Aug Sept Oct Nov Dec Year
Lat − 15 4.7 5.5 6.2 6.9 7.1 7.4 7.0 6.8 6.5 5.9 4.9 4.4 6.1
Lat 5.5 6.2 6.5 6.8 6.6 6.8 6.5 6.5 6.7 6.4 5.6 5.2 6.3
Lat + 15 6.0 6.5 6.4 6.3 5.8 5.7 5.6 5.9 6.4 6.5 6.0 5.7 6.1
90 5.7 5.6 4.7 3.7 2.9 2.5 2.6 3.2 4.3 5.2 5.5 5.5 4.3
1-Axis (Lat) 6.8 7.9 8.7 9.6 9.8 10.3 9.5 9.2 9.1 8.4 7.0 6.3 8.5
Temp. (
◦
C) 0.7 4.4 9.3 14.8 20.0 25.4 27.8 26.2 22.6 16.9 8.6 1.9 14.9
Boulder, CO Latitude 40.02
◦
N
Tilt Jan Feb Mar Apr May Jun July Aug Sept Oct Nov Dec Year
Lat − 15 3.8 4.6 5.4 6.1 6.2 6.6 6.6 6.3 5.9 5.1 4.0 3.5 5.4
Lat 4.4 5.1 5.6 6.0 5.9 6.1 6.1 6.1 6.0 5.6 4.6 4.2 5.5
Lat + 15 4.8 5.3 5.6 5.6 5.2 5.2 5.3 5.5 5.8 5.7 4.8 4.5 5.3
90 4.5 4.6 4.3 3.6 2.8 2.6 2.7 3.2 4.0 4.6 4.4 4.3 3.8
1-Axis (Lat) 5.2 6.2 7.2 8.0 8.1 8.8 8.7 8.4 7.9 7.1 5.5 4.9 7.2
Temp. (
◦
C) 6.2 8.1 11.2 16.6 21.6 27.4 31.2 29.9 24.9 19.1 11.4 6.9 17.9
Grand Junction, CO Latitude 39.12
◦
N
Tilt Jan Feb Mar Apr May Jun July Aug Sept Oct Nov Dec Year
Lat − 15 3.8 4.7 5.5 6.5 7.0 7.5 7.3 7.0 6.5 5.4 4.1 3.6 5.7
Lat 4.4 5.2 5.7 6.4 6.6 6.8 6.7 6.7 6.6 5.9 4.6 4.1 5.8
Lat + 15 4.7 5.4 5.6 6.0 5.8 5.8 5.8 6.1 6.4 6.0 4.9 4.5 5.6
90 4.4 4.7 4.2 3.7 3.0 2.7 2.8 3.5 4.4 4.8 4.4 4.3 3.9
1-Axis (Lat) 5.2 6.4 7.3 8.7 9.3 10.1 9.8 9.4 9.0 7.5 5.6 4.9 7.8
Temp. (
◦
C) 1.9 7.4 13.1 18.8 24.4 30.9 34.2 32.5 27.3 19.8 10.8 3.7 18.8
Radiation data measured in kWh/m
2
-day, average daily maximum temperature (
◦
C).
632 SOLAR INSOLATION TABLES BY CITY
Daytona Beach, FL Latitude 29.18
◦
N
Tilt Jan Feb Mar Apr May Jun July Aug Sept Oct Nov Dec Year
Lat − 15 3.8 4.5 5.5 6.4 6.4 6.0 5.9 5.8 5.2 4.7 4.1 3.6 5.2
Lat 4.3 4.9 5.7 6.3 6.0 5.5 5.5 5.6 5.3 5.0 4.6 4.1 5.2
Lat + 15 4.6 5.1 5.6 5.9 5.4 4.8 4.9 5.1 5.1 5.1 4.8 4.4 5.1
90 3.9 3.8 3.6 2.9 2.1 1.8 1.9 2.4 3.0 3.6 4.0 3.9 3.1
1-Axis (Lat) 5.2 6.0 7.2 8.3 7.9 7.1 7.1 7.0 6.5 6.1 5.5 4.9 6.6
Temp. (
◦
C) 20.0 20.8 23.8 26.7 29.2 31.1 32.1 31.7 30.4 27.5 24.2 21.3 26.6
Miami, FL Latitude 25.80
◦
N
Tilt Jan Feb Mar Apr May Jun July Aug Sept Oct Nov Dec Year
Lat − 15 4.1 4.7 5.5 6.2 5.9 5.5 5.7 5.6 5.1 4.7 4.2 3.9 5.1
Lat 4.7 5.2 5.7 6.1 5.6 5.1 5.4 5.5 5.1 5.1 4.7 4.5 5.2
Lat + 15 5.0 5.4 5.6 5.7 5.0 4.5 4.8 5.0 4.9 5.1 4.9 4.9 5.1
90 4.1 3.9 3.4 2.6 1.9 1.6 1.7 2.1 2.7 3.5 3.9 4.1 3.0
1-Axis (Lat) 5.7 6.4 7.2 7.8 7.2 6.3 6.7 6.7 6.2 6.1 5.6 5.4 6.5
Temp. (
◦
C) 24.0 24.7 26.2 28.0 29.6 30.9 31.7 31.7 31.0 29.2 26.9 24.8 28.2
Tallahassee, FL Latitude 30.38
◦
N
Tilt Jan Feb Mar Apr May Jun July Aug Sept Oct Nov Dec Year
Lat − 15 3.6 4.3 5.2 6.1 6.2 6.0 5.7 5.6 5.3 5.0 4.1 3.4 5.0
Lat 4.0 4.7 5.4 6.0 5.9 5.6 5.4 5.4 5.3 5.4 4.6 4.0 5.1
Lat + 15 4.3 4.9 5.3 5.6 5.2 4.9 4.7 4.9 5.1 5.5 4.8 4.2 5.0
90 3.6 3.7 3.4 2.9 2.2 1.9 2.0 2.4 3.1 4.0 4.0 3.7 3.1
1-Axis (Lat) 4.8 5.8 6.7 7.8 7.7 7.1 6.8 6.8 6.6 6.7 5.5 4.6 6.4
Temp. (
◦
C) 17.2 19.1 23.1 26.9 30.2 32.7 32.9 32.8 31.4 27.5 22.8 18.8 26.3
Atlanta, GA Latitude 33.65
◦
N
Tilt Jan Feb Mar Apr May Jun July Aug Sept Oct Nov Dec Year
Lat − 15 3.4 4.2 5.1 6.0 6.2 6.3 6.1 5.9 5.3 4.9 3.8 3.2 5.0
Lat 3.8 4.6 5.3 5.8 5.8 5.8 5.7 5.7 5.4 5.2 4.2 3.7 5.1
Lat + 15 4.1 4.7 5.1 5.4 5.2 5.1 5.0 5.2 5.1 5.3 4.9 3.9 4.9
90 3.5 3.7 3.5 3.0 2.4 2.2 2.2 2.7 3.2 4.0 3.8 3.5 3.1
1-Axis (Lat) 4.5 5.5 6.6 7.6 7.7 7.6 7.3 7.2 6.7 6.4 5.0 4.3 6.4
Temp. (
◦
C) 10.2 12.8 17.9 22.6 26.4 29.9 31.1 30.6 27.7 22.6 17.4 12.2 21.8
Savannah, GA Latitude 32.13
◦
N
Tilt Jan Feb Mar Apr May Jun July Aug Sept Oct Nov Dec Year
Lat − 15 3.5 4.3 5.2 6.1 6.2 6.1 6.0 5.6 5.1 4.8 3.9 3.4 5.0
Lat 4.0 4.7 5.4 6.0 5.8 5.7 5.6 5.4 5.1 5.1 4.4 3.9 5.1
Lat + 15 4.3 4.8 5.3 5.6 5.2 4.9 4.9 5.0 4.9 5.2 4.6 4.2 4.9
90 3.7 3.8 3.6 3.0 2.3 2.0 2.1 2.5 3.0 3.8 3.9 3.7 3.1
1-Axis (Lat) 4.8 5.7 6.8 7.9 7.7 7.4 7.1 6.8 6.3 6.3 5.3 4.5 6.4
Temp. (
◦
C) 15.4 16.9 21.2 25.3 28.9 31.6 32.8 32.1 29.6 25.3 21.1 16.8 24.7
Radiation data measured in kWh/m
2
-day, average daily maximum temperature (
◦
C).
SOLAR INSOLATION TABLES BY CITY 633
Honolulu, HI Latitude 21.33
◦
N
Tilt Jan Feb Mar Apr May Jun July Aug Sept Oct Nov Dec Year
Lat − 15 4.3 5.0 5.6 5.9 6.3 6.4 6.5 6.5 6.1 5.3 4.5 4.1 5.5
Lat 4.9 5.5 5.8 5.9 5.9 5.9 6.0 6.2 6.2 5.7 5.1 4.8 5.7
Lat + 15 5.3 5.8 5.8 5.5 5.3 5.1 5.3 5.7 6.0 5.8 5.4 5.2 5.5
90 4.2 4.0 3.2 2.2 1.5 1.4 1.4 1.8 2.8 3.7 4.1 4.3 2.9
1-Axis (Lat) 6.1 7.0 7.5 7.7 8.0 8.1 8.3 8.5 8.2 7.3 6.2 5.9 7.4
Temp. (
◦
C) 26.7 26.9 27.6 28.2 29.3 30.3 30.8 31.5 31.4 30.5 28.9 27.3 29.1
Boise, ID Latitude 43.57
◦
N
Tilt Jan Feb Mar Apr May Jun July Aug Sept Oct Nov Dec Year
Lat − 15 2.5 3.5 4.7 5.9 6.7 7.1 7.6 7.1 6.3 4.9 2.9 2.3 5.1
Lat 2.8 3.8 4.9 5.8 6.2 6.5 7.0 6.8 6.5 5.2 3.2 2.6 5.1
Lat + 15 2.9 3.9 4.8 5.4 5.5 5.5 6.0 6.2 6.2 5.3 3.3 2.8 4.8
90 2.7 3.4 3.7 3.6 3.2 3.0 3.3 3.8 4.6 4.5 3.0 2.6 3.5
1-Axis (Lat) 3.1 4.5 6.2 7.8 9.0 9.6 10.7 9.9 8.8 6.6 3.7 2.9 6.9
Temp. (
◦
C)
Indianapolis, IN Latitude 39.73
◦
N
Tilt Jan Feb Mar Apr May Jun July Aug Sept Oct Nov Dec Year
Lat − 15 2.8 3.6 4.3 5.2 5.9 6.3 6.2 5.9 5.2 4.2 2.8 2.3 4.6
Lat 3.1 3.9 4.4 5.1 5.6 5.8 5.8 5.7 5.3 4.5 3.1 2.6 4.6
Lat + 15 3.3 4.0 4.3 4.7 4.9 5.0 5.1 5.2 5.1 4.5 3.2 2.7 4.3
90 3.0 3.5 3.2 3.0 2.7 2.6 2.7 3.1 3.5 3.6 2.8 2.5 3.0
1-Axis (Lat) 3.6 4.6 5.3 6.5 7.4 7.9 7.8 7.5 6.7 5.5 3.5 2.9 5.8
Temp. (
◦
C) 0.9 3.5 10.5 17.4 23.2 28.2 29.7 28.7 25.3 18.8 11.1 3.6 16.7
Dodge City, KS Latitude 37.77
◦
N
Tilt Jan Feb Mar Apr May Jun July Aug Sept Oct Nov Dec Year
Lat − 15 4.0 4.8 5.5 6.3 6.5 7.0 7.1 6.6 5.9 5.2 4.0 3.6 5.5
Lat 4.6 5.3 5.8 6.2 6.1 6.4 6.5 6.4 6.0 5.6 4.6 4.2 5.6
Lat + 15 5.0 5.5 5.7 5.8 5.4 5.5 5.7 5.8 5.7 5.7 4.8 4.6 5.4
90 4.6 4.6 4.2 3.5 2.7 2.5 2.7 3.2 3.9 4.5 4.3 4.3 3.7
1-Axis (Lat) 5.6 6.5 7.4 8.3 8.4 9.0 9.2 8.7 7.8 7.0 5.5 5.0 7.4
Temp. (
◦
C) 5.3 8.5 13.7 20.0 24.6 30.6 33.9 32.6 27.4 21.5 12.9 6.6 19.8
Lake Charles, LA Latitude 30.12
◦
N
Tilt Jan Feb Mar Apr May Jun July Aug Sept Oct Nov Dec Year
Lat − 15 3.3 4.1 4.9 5.5 6.0 6.2 5.9 5.7 5.4 5.0 3.9 3.2 4.9
Lat 3.7 4.5 5.1 5.4 5.6 5.7 5.5 5.6 5.4 5.4 4.3 3.7 5.0
Lat + 15 3.9 4.6 4.9 5.1 5.0 5.0 4.9 5.1 5.2 5.4 4.6 3.9 4.8
90 3.2 3.5 3.2 2.6 2.1 1.9 2.0 2.4 3.1 3.9 3.7 3.4 2.9
1-Axis (Lat) 4.3 5.4 6.2 6.9 7.2 7.5 7.0 7.0 6.8 6.6 5.2 4.3 6.2
Temp. (
◦
C) 15.4 17.4 21.5 25.5 28.9 31.7 32.7 32.7 30.4 26.8 21.6 17.4 25.2
Radiation data measured in kWh/m
2
-day, average daily maximum temperature (
◦
C).
634 SOLAR INSOLATION TABLES BY CITY
Boston, MA Latitude 42.37
◦
N
Tilt Jan Feb Mar Apr May Jun July Aug Sept Oct Nov Dec Year
Lat − 15 3.0 3.8 4.6 5.2 5.7 6.0 6.0 5.7 5.0 4.1 2.8 2.5 4.5
Lat 3.4 4.2 4.7 5.0 5.3 5.5 5.6 5.5 5.1 4.3 3.1 2.9 4.6
Lat + 15 3.6 4.3 4.6 4.7 4.7 4.8 4.9 5.0 4.9 4.4 3.3 3.1 4.4
90 3.4 3.9 3.7 3.1 2.8 2.6 2.8 3.1 3.5 3.6 3.0 2.9 3.2
1-Axis (Lat) 3.9 5.0 5.9 6.5 7.1 7.4 7.5 7.1 6.4 5.2 3.6 3.2 5.7
Temp. (
◦
C) 2.1 3.1 7.7 13.3 19.2 24.6 27.7 26.6 22.7 17.1 11.2 4.7 15.0
Caribou, ME Latitude 46.87
◦
N
Tilt Jan Feb Mar Apr May Jun July Aug Sept Oct Nov Dec Year
Lat − 15 2.9 3.9 5.0 5.1 5.3 5.6 5.6 5.2 4.3 3.1 2.2 2.2 4.2
Lat 3.3 4.3 5.2 5.0 4.9 5.1 5.2 4.9 4.3 3.3 2.4 2.5 4.2
Lat + 15 3.5 4.5 5.2 4.7 4.4 4.5 4.6 4.5 4.1 3.3 2.5 2.7 4.0
90 3.4 4.2 4.6 3.7 2.9 2.8 2.9 3.0 3.2 2.8 2.3 2.7 3.2
1-Axis (Lat) 3.7 5.1 6.5 6.5 6.7 7.1 7.2 6.6 5.6 3.9 2.7 2.8 5.4
Temp. (
◦
C) −7.0 −5.0 1.3 8.2 16.5 22.2 24.7 23.1 17.8 11.1 3.1 −4.4 9.3
Columbia, MO Latitude 38.82
◦
N
Tilt Jan Feb Mar Apr May Jun July Aug Sept Oct Nov Dec Year
Lat − 15 3.3 4.0 4.7 5.6 6.0 6.4 6.6 6.2 5.3 4.5 3.2 2.8 4.9
Lat 3.8 4.4 4.9 5.5 5.6 5.9 6.1 5.9 5.4 4.9 3.6 3.2 4.9
Lat + 15 4.0 4.5 4.8 5.1 5.0 5.1 5.3 5.4 5.1 4.9 3.8 3.4 4.7
90 3.7 3.9 3.5 3.2 2.7 2.5 2.7 3.1 3.5 3.9 3.3 3.2 3.3
1-Axis (Lat) 4.4 5.2 6.0 7.1 7.6 8.1 8.4 7.9 6.9 6.0 4.2 3.7 6.3
Temp. (
◦
C) 2.6 5.2 11.8 18.7 23.4 28.2 31.4 30.4 26.0 19.8 12.0 4.6 17.8
Glascow, MT Latitude 48.22
◦
N
Tilt Jan Feb Mar Apr May Jun July Aug Sept Oct Nov Dec Year
Lat − 15 2.7 3.7 4.8 5.4 5.8 6.4 6.8 6.4 5.2 4.1 2.8 2.3 4.7
Lat 3.1 4.1 5.0 5.3 5.5 5.9 6.3 6.1 5.3 4.3 3.1 2.6 4.7
Lat + 15 3.3 4.2 4.9 4.9 4.8 5.0 5.5 5.5 5.0 4.4 3.3 2.8 4.5
90 3.2 3.9 4.2 3.6 3.2 3.1 3.4 3.8 3.9 3.8 3.1 2.8 3.5
1-Axis (Lat) 3.5 4.8 6.3 7.2 7.7 8.6 9.4 8.7 6.9 5.3 3.6 3.0 6.3
Temp. (
◦
C) −6.7 −2.7 4.3 13.6 19.6 25.3 29.3 28.6 21.3 14.8 4.2 −3.9 12.3
Cape Hatteras, NC Latitude 35.27
◦
N
Tilt Jan Feb Mar Apr May Jun July Aug Sept Oct Nov Dec Year
Lat − 15 3.3 4.1 5.1 6.0 6.1 6.2 6.1 5.8 5.3 4.6 3.7 3.2 5.0
Lat 3.8 4.5 5.2 5.9 5.8 5.7 5.7 5.6 5.4 4.9 4.2 3.6 5.0
Lat + 15 4.0 4.6 5.2 5.5 5.1 5.0 5.0 5.1 5.1 4.9 4.5 3.9 4.8
90 3.6 3.7 3.6 3.1 2.5 2.2 2.3 2.7 3.3 3.8 3.9 3.6 3.2
1-Axis (Lat) 4.5 5.4 6.6 7.7 7.6 7.6 7.4 7.2 6.7 6.0 5.0 4.3 6.3
Temp. (
◦
C) 11.3 11.9 15.3 19.4 23.6 27.1 29.2 29.3 27.1 22.4 18.2 13.8 20.7
Radiation data measured in kWh/m
2
-day, average daily maximum temperature (
◦
C).
SOLAR INSOLATION TABLES BY CITY 635
Raleigh, NC Latitude 35.87
◦
N
Tilt Jan Feb Mar Apr May Jun July Aug Sept Oct Nov Dec Year
Lat − 15 3.4 4.1 5.0 5.8 6.0 6.2 6.0 5.7 5.1 4.6 3.7 3.1 4.9
Lat 3.8 4.5 5.2 5.7 5.7 5.7 5.6 5.5 5.2 4.9 4.1 3.6 5.0
Lat + 15 4.1 4.6 5.1 5.3 5.0 4.9 4.9 5.0 5.0 5.0 4.3 3.8 4.8
90 3.6 3.8 3.6 3.1 2.5 2.3 2.4 2.8 3.3 3.8 3.7 3.5 3.2
1-Axis (Lat) 4.5 5.5 6.5 7.5 7.4 7.5 7.2 6.9 6.4 6.0 4.9 4.2 6.2
Temp. (
◦
C) 9.4 11.4 16.7 22.1 25.9 29.4 31.1 30.4 27.3 22.0 17.0 11.5 21.2
Bismarck, ND Latitude 46.77
◦
N
Tilt Jan Feb Mar Apr May Jun July Aug Sept Oct Nov Dec Year
Lat − 15 3.1 4.0 5.0 5.6 6.1 6.5 6.8 6.4 5.3 4.2 2.9 2.6 4.9
Lat 3.5 4.4 5.2 5.5 5.7 5.9 6.3 6.1 5.4 4.5 3.2 3.0 4.9
Lat + 15 3.7 4.5 5.1 5.1 5.1 5.1 5.5 5.5 5.1 4.5 3.4 3.2 4.7
90 3.7 4.2 4.3 3.7 3.3 3.1 3.4 3.7 3.9 3.9 3.2 3.1 3.6
1-Axis (Lat) 4.0 5.2 6.4 7.3 8.0 8.6 9.2 8.5 7.0 5.5 3.7 3.3 6.4
Temp. (
◦
C) −18.7 −14.9 −7.9 −0.6 5.7 10.9 13.6 12.2 6.2 0.3 −7.9 −15.9 −1.4
Omaha, NE Latitude 41.37
◦
N
Tilt Jan Feb Mar Apr May Jun July Aug Sept Oct Nov Dec Year
Lat − 15 3.3 4.0 4.7 5.5 6.0 6.5 6.5 6.1 5.2 4.4 3.2 2.7 4.9
Lat 3.8 4.4 4.9 5.3 5.6 6.0 6.0 5.8 5.3 4.7 3.5 3.2 4.9
Lat + 15 4.1 4.6 4.8 5.0 5.0 5.2 5.3 5.3 5.1 4.7 3.7 3.4 4.7
90 3.9 4.1 3.8 3.2 2.8 2.7 2.8 3.2 3.6 3.9 3.3 3.2 3.4
1-Axis (Lat) 4.5 5.3 6.1 7.0 7.5 8.3 8.3 7.8 6.7 5.7 4.1 3.6 6.3
Temp. (
◦
C) −1.3 1.7 8.7 16.9 22.7 28.0 30.3 28.9 23.8 17.8 8.7 0.5 15.6
Albuquerque, NM Latitude 35.05
◦
N
Tilt Jan Feb Mar Apr May Jun July Aug Sept Oct Nov Dec Year
Lat − 15 4.6 5.4 6.3 7.3 7.7 7.8 7.4 7.2 6.6 5.9 4.8 4.3 6.3
Lat 5.3 6.0 6.5 7.2 7.2 7.1 6.9 6.9 6.8 6.5 5.5 5.0 6.4
Lat + 15 5.8 6.2 6.5 6.6 6.3 6.1 6.0 6.3 6.5 6.6 5.9 5.5 6.2
90 5.2 5.1 4.5 3.7 2.8 2.4 2.5 3.2 4.2 5.1 5.2 5.1 4.1
1-Axis (Lat) 6.5 7.5 8.6 9.9 10.3 10.4 9.5 9.3 9.0 8.3 6.8 6.1 8.5
Temp. (
◦
C) 8.2 11.9 16.3 21.6 26.5 32.2 33.6 31.7 27.7 21.7 14.1 8.6 21.2
Ely, NV Latitude 39.28
◦
N
Tilt Jan Feb Mar Apr May Jun July Aug Sept Oct Nov Dec Year
Lat − 15 4.0 4.7 5.5 6.3 6.6 7.2 7.2 6.9 6.6 5.5 4.1 3.6 5.7
Lat 4.6 5.2 5.7 6.2 6.2 6.6 6.6 6.6 6.7 6.0 4.7 4.3 5.8
Lat + 15 5.0 5.5 5.6 5.7 5.5 5.6 5.7 6.0 6.5 6.1 5.0 4.7 5.6
90 4.8 4.8 4.3 3.6 2.9 2.6 2.8 3.4 4.4 4.9 4.5 4.5 4.0
1-Axis (Lat) 5.5 6.5 7.4 8.4 8.9 9.9 9.9 9.5 9.2 7.7 5.6 5.1 7.8
Temp. (
◦
C) 4.3 6.4 9.1 13.9 19.6 25.7 30.6 29.1 24.0 17.5 9.6 4.8 16.2
Radiation data measured in kWh/m
2
-day, average daily maximum temperature (
◦
C).
636 SOLAR INSOLATION TABLES BY CITY
LAS Vegas, NV Latitude 36.08
◦
N
Tilt Jan Feb Mar Apr May Jun July Aug Sept Oct Nov Dec Year
Lat − 15 4.4 5.3 6.4 7.5 7.8 8.1 7.7 7.5 7.1 6.1 4.8 4.2 6.4
Lat 5.1 5.9 6.7 7.4 7.3 7.4 7.1 7.2 7.2 6.6 5.5 4.9 6.5
Lat + 15 5.6 6.1 6.6 6.8 6.5 6.3 6.2 6.5 7.0 6.8 5.9 5.4 6.3
90 5.0 5.1 4.7 3.9 3.0 2.6 2.6 3.4 4.5 5.3 5.2 5.0 4.2
1-Axis (Lat) 6.2 7.3 8.8 10.2 10.6 11.1 10.4 10.3 9.8 8.6 6.7 5.9 8.8
Temp. (
◦
C) 14.1 17.4 20.4 25.3 31.0 37.9 41.1 39.6 34.8 27.8 19.7 14.2 26.9
Albany, NY Latitude 42.75
◦
N
Tilt Jan Feb Mar Apr May Jun July Aug Sept Oct Nov Dec Year
Lat − 15 2.7 3.6 4.4 5.0 5.5 5.8 6.0 5.5 4.8 3.7 2.4 2.1 4.3
Lat 3.0 3.9 4.5 4.9 5.1 5.4 5.5 5.2 4.8 3.9 2.6 2.4 4.3
Lat + 15 3.2 4.1 4.4 4.5 4.6 4.6 4.8 4.8 4.6 3.9 2.7 2.5 4.1
90 3.1 3.7 3.5 3.1 2.7 2.6 2.8 3.0 3.3 3.2 2.4 2.4 3.0
1-Axis (Lat) 3.5 4.6 5.5 6.3 6.8 7.2 7.5 6.9 6.0 4.6 2.9 2.6 5.4
Temp. (
◦
C) −11.7 −10.1 −4.2 1.7 7.4 12.6 15.3 14.3 9.7 3.7 −0.7 −7.7 2.6
New York City, NY Latitude 40.78
◦
N
Tilt Jan Feb Mar Apr May Jun July Aug Sept Oct Nov Dec Year
Lat − 15 2.9 3.7 4.6 5.3 5.8 6.0 6.0 5.7 5.0 4.1 2.9 2.4 4.5
Lat 3.2 4.0 4.8 5.2 5.4 5.5 5.6 5.5 5.0 4.4 3.2 2.8 4.6
Lat + 15 3.4 4.1 4.6 4.8 4.8 4.8 4.9 5.0 4.8 4.4 3.3 3.0 4.3
90 3.2 3.6 3.5 3.1 2.7 2.6 2.7 3.0 3.4 3.6 3.0 2.7 3.1
1-Axis (Lat) 3.7 4.7 5.8 6.6 6.9 7.2 7.2 6.9 6.2 5.3 3.7 3.1 5.6
Temp. (
◦
C) 3.1 4.6 10.0 16.2 22.1 26.7 29.6 28.7 24.6 18.5 12.2 5.8 16.8
Burns, OR Latitude 43.58
◦
N
Tilt Jan Feb Mar Apr May Jun July Aug Sept Oct Nov Dec Year
Lat − 15 2.8 3.7 4.7 5.8 6.5 6.9 7.5 7.0 6.3 4.8 2.8 2.4 5.1
Lat 3.1 4.0 4.9 5.7 6.1 6.3 6.9 6.8 6.4 5.2 3.1 2.7 5.1
Lat + 15 3.3 4.1 4.8 5.3 5.4 5.4 6.0 6.1 6.1 5.2 3.3 2.9 4.8
90 3.2 3.7 3.8 3.6 3.2 3.0 3.3 3.8 4.5 4.4 2.9 2.8 3.5
1-Axis (Lat) 3.5 4.8 6.1 7.6 8.7 9.4 10.5 9.8 8.7 6.5 3.6 3.1 6.9
Temp. (
◦
C) 0.9 4.2 8.7 13.6 18.7 23.6 29.5 28.5 23.1 16.6 7.3 1.8 14.7
Eugene, OR Latitude 44.12
◦
N
Tilt Jan Feb Mar Apr May Jun July Aug Sept Oct Nov Dec Year
Lat − 15 1.8 2.6 3.8 4.8 5.6 6.0 6.7 6.3 5.4 3.6 1.9 1.4 4.2
Lat 2.0 2.7 3.8 4.7 5.3 5.5 6.2 6.0 5.5 3.8 2.1 1.6 4.1
Lat + 15 2.0 2.8 3.7 4.3 4.6 4.8 5.4 5.5 5.2 3.8 2.1 1.6 3.8
90 1.8 2.3 2.9 3.0 2.8 2.7 3.1 3.5 3.9 3.2 1.8 1.5 2.7
1-Axis (Lat) 2.1 3.1 4.6 5.9 7.1 7.8 9.1 8.4 7.1 4.6 2.3 1.7 5.3
Temp. (
◦
C) 8.0 10.8 13.3 15.8 19.5 23.4 27.6 27.7 24.6 18.1 11.3 7.9 17.3
Radiation data measured in kWh/m
2
-day, average daily maximum temperature (
◦
C).
SOLAR INSOLATION TABLES BY CITY 637
Medford, OR Latitude 42.37
◦
N
Tilt Jan Feb Mar Apr May Jun July Aug Sept Oct Nov Dec Year
Lat − 15 2.1 3.2 4.5 5.7 6.6 7.1 7.7 7.2 6.3 4.5 2.3 1.7 4.9
Lat 2.3 3.5 4.6 5.6 6.2 6.5 7.1 6.9 6.4 4.8 2.4 1.9 4.9
Lat + 15 2.4 3.5 4.5 5.2 5.5 5.6 6.2 6.3 6.2 4.8 2.5 2.0 4.5
90 2.2 3.0 3.4 3.5 3.1 2.9 3.2 3.8 4.4 4.0 2.2 1.8 3.1
1-Axis (Lat) 2.6 4.0 5.6 7.3 8.7 9.5 10.7 9.9 8.6 5.9 2.7 2.0 6.5
Temp. (
◦
C) 7.6 11.8 14.7 18.1 22.7 27.8 32.5 32.2 28.2 20.8 11.4 6.8 19.6
Portland, OR Latitude 45.60
◦
N
Tilt Jan Feb Mar Apr May Jun July Aug Sept Oct Nov Dec Year
Lat − 15 1.7 2.5 3.6 4.6 5.4 5.8 6.3 5.9 5.1 3.4 1.9 1.4 4.0
Lat 1.9 2.6 3.7 4.5 5.0 5.3 5.8 5.6 5.1 3.6 2.1 1.6 3.9
Lat + 15 1.9 2.7 3.5 4.1 4.4 4.6 5.1 5.1 4.9 3.6 2.1 1.6 3.6
90 1.8 2.3 2.8 2.9 2.8 2.7 3.1 3.4 3.7 3.0 1.9 1.5 2.6
1-Axis (Lat) 2.0 3.0 4.3 5.5 6.5 7.2 8.1 7.5 6.5 4.3 2.2 1.7 4.9
Temp. (
◦
C) 7.4 10.6 13.3 15.9 19.5 23.3 26.6 26.8 23.7 17.8 11.4 7.6 17.0
Redmond, OR Latitude 44.27
◦
N
Tilt Jan Feb Mar Apr May Jun July Aug Sept Oct Nov Dec Year
Lat − 15 2.6 3.5 4.8 5.9 6.6 7.0 7.6 7.1 6.3 4.7 2.9 2.4 5.1
Lat 3.0 3.8 4.9 5.7 6.2 6.4 7.0 6.9 6.4 5.1 3.2 2.7 5.1
Lat + 15 3.1 3.9 4.8 5.3 5.5 5.5 6.1 6.2 6.1 5.1 3.3 2.9 4.8
90 2.9 3.4 3.8 3.7 3.3 3.1 3.4 3.9 4.5 4.3 3.0 2.7 3.5
1-Axis (Lat) 3.4 4.4 6.2 7.7 8.8 9.5 10.6 9.9 8.6 6.3 3.6 3.0 6.9
Temp. (
◦
C) 5.1 8.4 11.5 15.1 19.6 24.8 29.6 28.8 24.1 17.9 9.4 5.4 16.7
Pittsburgh, PA Latitude 40.50
◦
N
Tilt Jan Feb Mar Apr May Jun July Aug Sept Oct Nov Dec Year
Lat − 15 2.4 3.2 4.1 4.9 5.5 5.9 5.9 5.5 4.8 3.8 2.4 1.9 4.2
Lat 2.6 3.4 4.2 4.8 5.2 5.4 5.5 5.3 4.8 4.1 2.6 2.1 4.2
Lat + 15 2.7 3.5 4.1 4.4 4.6 4.7 4.8 4.8 4.6 4.1 2.7 2.2 3.9
90 2.5 3.0 3.1 2.9 2.6 2.5 2.6 2.9 3.2 3.3 2.3 2.0 2.7
1-Axis (Lat) 2.9 3.9 5.0 6.0 6.6 7.2 7.2 6.8 6.0 4.8 2.9 2.3 5.1
Temp. (
◦
C) 0.9 2.7 9.4 15.7 21.4 26.1 28.1 27.1 23.5 16.9 10.2 3.7 15.5
Guam, PI Latitude 13.55
◦
N
Tilt Jan Feb Mar Apr May Jun July Aug Sept Oct Nov Dec Year
Lat − 15 4.3 4.8 5.4 5.8 5.7 5.5 5.1 4.9 4.8 4.6 4.3 4.1 4.9
Lat 5.0 5.2 5.7 5.7 5.4 5.1 4.8 4.7 4.9 4.9 4.9 4.8 5.1
Lat + 15 5.3 5.4 5.6 5.3 4.9 4.5 4.3 4.4 4.7 4.9 5.1 5.1 5.0
90 3.8 3.3 2.6 1.7 1.5 1.5 1.5 1.5 2.0 2.8 3.5 3.8 2.5
1-Axis (Lat) 6.1 6.4 7.1 7.3 7.0 6.6 6.0 5.7 6.0 5.9 5.9 5.8 6.3
Temp. (
◦
C) 28.7 28.6 29.2 29.9 30.4 30.5 30.2 29.9 30.1 29.9 29.6 29.0 29.7
Radiation data measured in kWh/m
2
-day, average daily maximum temperature (
◦
C).