ICC Subscriptions
 
SECTION 302 THERMAL DESIGN PARAMETERS

302.1 Exterior design conditions.


The following design parameters in Table 302.1 shall be used for calculations required under this code.

TABLE 302.1 EXTERIOR DESIGN CONDITIONS


CONDITION
VALUE
Wintera, Design Dry-bulb (°F.)
Summera, Design Dry-bulb (°F.)
Summera, Design Wet-bulb (°F.)
Degree days heatingb
Degree days coolingb
Climate zonec

For SI:   °C = (°F)-32]/1.8.

a.   The outdoor design temperature shall be selected from the columns of 97 ½ percent values for winter and 2 ½ percent values for summer from tables in the ASHRAE Handbook of Fundamentals. Adjustments shall be permitted to reflect local climates which differ from the tabulated temperatures, or local weather experience determined by the code official or to reflect local weather experience.
b.   The degree days heating (base 65°F) and cooling (base 65°F) shall be selected from NOAA "Annual Degree Days to Selected Bases Derived from the 1961-1990 Normals," the ASHRAE Handbook of Fundamentals, data available from adjacent military installations, or other source of local weather data.

b.   The degree days heating (base 65°F) and cooling (base 65°F) shall be selected from NOAA “Annual Degree Days to Selected Bases Derived from the 1961-1990 Normals,” the ASHRAE Handbook of Fundamentals, data available from adjacent military installations, or other source of local weather data acceptable to the code official.
c.   The climate zone shall be selected from the applicable map provided in Figures 302.1(1) through 302.1(51) on the following pages.





ALABAMAa
FIGURE 302.1(1)


a.   Counties identified with (H) shall be considered "hot and humid climate areas" for purposes of the application of Section 502.1.1





ALASKA
FIGURE 302.1(2)






ARIZONA
FIGURE 302.1(3)






ARKANSASa
FIGURE 302.1(4)


a.   Counties identified with (H) shall be considered "hot and humid climate areas" for purposes of the application of Section 502.1.1





CALIFORNIA
FIGURE 302.1(5)






COLORADO
FIGURE 302.1(6)






CONNECTICUT
FIGURE 302.1(7)






DELAWARE
FIGURE 302.1(8)









FLORIDAa
FIGURE 302.1(10)


a.   Counties identified with (H) shall be considered "hot and humid climate areas" for purposes of the application of Section 502.1.1





GEORGIAa
FIGURE 302.1(11)


a.   Counties identified with (H) shall be considered "hot and humid climate areas" for purposes of the application of Section 502.1.1





HAWAIIa
FIGURE 302.1(12)


a.   Counties identified with (H) shall be considered "hot and humid climate areas" for purposes of the application of Section 502.1.1.





IDAHO
FIGURE 302.1(13)






ILLINOIS
FIGURE 302.1(14)






INDIANA
FIGURE 302.1(15)






IOWA
FIGURE 302.1(16)






KANSAS
FIGURE 302.1(17)






KENTUCKY
FIGURE 302.1(18)






LOUISIANAa
FIGURE 302.1(19)


a.   Counties identified with (H) shall be considered "hot and humid climate areas" for purposes of the application of Section 502.1.1





MAINE
FIGURE 302.1(20)






MARYLAND
FIGURE 302.1(21)






MASSACHUSETTS
FIGURE 302.1(22)






MICHIGAN
FIGURE 302.1(23)






MINNESOTA
FIGURE 302.1(24)






MISSISSIPPIa
FIGURE 302.1(25)


a.   Counties identified with (H) shall be considered "hot and humid climate areas" for purposes of the application of Section 502.1.1





MISSOURI
FIGURE 302.1(26)






MONTANA
FIGURE 302.1(27)






NEBRASKA
FIGURE 302.2(28)






NEVADA
FIGURE 302.1(29)






NEW HAMPSHIRE
FIGURE 302.1(30)






NEW JERSEY
FIGURE 302.1(31)






NEW MEXICO
FIGURE 302.1(32)






NEW YORK
FIGURE 302.1(33)






NORTH CAROLINAa
FIGURE 302.1(34)


a.   Counties identified with (H) shall be considered "hot and humid climate areas" for purposes of the application of Section 502.1.1





NORTH DAKOTA
FIGURE 302.1(35)






OHIO
FIGURE 302.1(36)






OKLAHOMAa
FIGURE 302.1(37)


a.   Counties identified with (H) shall be considered "hot and humid climate areas" for purposes of the application of Section 502.1.1.





OREGON
FIGURE 302.1(38)






PENNSYLVANIA
FIGURE 302.1(39)






RHODE ISLAND
FIGURE 302.1(40)






SOUTH CAROLINAa
FIGURE 302.1(41)


a.   Counties identified with (H) shall be considered "hot and humid climate areas" for purposes of the application of Section 502.1.1





SOUTH DAKOTA
FIGURE 302.1(42)






TENNESSEE
FIGURE 302.1(43)


a.   Counties identified with (H) shall be considered "hot and humid climate areas" for purposes of the application of Section 502.1.1





TEXAS
FIGURE 302.1(44)


a.   Counties identified with (H) shall be considered "hot and humid climate areas" for purposes of the application of Section 502.1.1





UTAH
FIGURE 302.1(45)






VERMONT
FIGURE 302.1(46)






VIRGINIA
FIGURE 302.1(47)






WASHINGTON
FIGURE 302.1(48)






WEST VIRGINIA
FIGURE 302.1(49)






WISCONSIN
FIGURE 302.1(50)






WYOMING
FIGURE 302.1(51)