Design Information for Austin, Texas

Latitude: 30.30
Longitude: 97.70

(all temperatures in degrees Fahrenheit)

J F M A M J J A S O N D YEAR
Avg.
Temp.
(Drybulb)
50.3 53.2 57.3 69.2 74.2 80.4 84.0 83.9 78.8 68.8 57.3 51.3 67.5
Avg.
Daily
Max.
60.7 64.3 68.6 79.3 84.6 90.1 93.4 93.9 88.8 80.1 69.0 62.5 78.0
Avg.
Daily
Min.
41.0 42.4 46.9 60.0 64.9 71.7 74.6 74.6 70.6 58.6 46.8 42.5 58.0
Deg.
Days
Heating
(Base 65)
450.5 330.5 251.5 17.5 4.0 0.0 0.0 0.0 0.0 43.0 256.5 411.0 1764.5
Deg.
Days
Cooling
(Base 75)
0.0 0.0 0.0 6.0 83.5 190.5 280.0 286.5 161.0 30.5 0.0 0.0 1038.0
Deg.
Days
Cooling
(Base 80)
0.0 0.0 0.0 0.0 28.0 75.5 127.5 146.0 56.0 9.5 0.0 0.0 442.5
Max.
Temp
83 84 81 89 99 95 99 104 96 93 87 81 104
Min.
Temp
28 31 24 46 54 55 69 68 61 43 30 28 24
No. Days max.
above
90
0 0 0 0 6 22 29 24 16 4 0 0 101
No. Days
Min.
below
32
4 1 2 0 0 0 0 0 0 0 3 3 13
Avg.
Temp
(Day)
55 57.8 61.1 72.6 77.5 84 87.6 87.7 82.8 73.4 62.0 55.2 72.7
Avg.
Temp
(Night)
47.6 50.2 54.4 65.9 70.7 76.4 80.1 80.2 75.2 65.1 54.0 48.9 63.0

 

Average Wind Speed (MPH)

J F M A M J J A S O N D YEAR
10.6 10.5 10.4 12.1 9.9 10.0 8.0 7.4 6.6 8.3 9.0 9.2 9.3

 

Average Relative Humidity

J F M A M J J A S O N D YEAR
(4AM) 70.2 76.8 70.0 81.6 81.3 86.5 83.7 80.7 86.0 85.2 77.4 78.6 79.8
(10AM) 60.4 65.0 58.1 65.1 64.4 62.9 61.5 63.9 68.5 67.3 61.9 67.6 63.9
(4PM) 49.4 50.1 36.8 48.0 47.9 46.6 44.2 46.4 48.2 53.1 46.5 47.1 47.0
(10PM) 63.1 72.3 55.3 71.7 67.5 69.5 65.7 65.4 76.9 76.6 69.2 65.8 68.2

 

Average Daily Total Vertical Solar Insolation (listed in BTU’s per square foot per day)

A
z
i
m
u
t
h
J F M A M J J A S O N D YEAR
N 233.6 302.2 419.2 520.9 615.9 704.5 659.1 523.4 433.8 322.8 248.3 217.7 434.1
E 566.6 680.8 888.1 911.7 1008.2 1140.9 1187.4 1081.2 914.5 778.0 614.4 507.1 857.6
S 1226.8 1206.8 1183.9 936.4 796.1 736.2 763.0 884.2 1115.3 1294.6 1281.6 1259.2 1056.2
W 561.5 680.1 936.3 1023.6 1136.2 1202.4 1184.3 1076.2 940.2 807.1 644.9 586.9 899.5

 

Maximum Daily Total Vertical Solar Insolation (listed in BTU’s per square foot per day)

A
z
i
m
u
t
h
J F M A M J J A S O N D YEAR
N 355.2 400.7 516.7 635.7 727.2 798.2 735.6 590.4 510.0 411.1 354.3 281.0 798.2
E 798.1 1063.5 1269.0 1368.9 1383.6 1382.4 1339.6 1294.9 1142.5 1013.7 880.3 745.5 1383.6
S 1835.2 1811.8 1681.6 1363.2 982.9 815.6 832.9 1105.0 1478.0 1728.0 1798.2 1815.2 1835.2
W 766.8 1010.1 1281.5 1348.9 1340.9 1356.2 1307.1 1244.1 1121.8 1009.1 888.9 741.5 1356.2