• ANNEX1
    REFERENCED STANDARD REPRODUCTION ANNEX
    ASHRAE STANDARD 169

    (This annex contains normative material from an existing ASHRAE standard that is cited in this code. This annex is not part of this code; its inclusion is merely informative. It is included here to facilitate use of this code.)

    Annex 1 contains extractions of material from ASHRAE Standard 169. The table below lists where in Standard 189.1 this material is referenced and whether it is referenced normatively or informatively.

    STANDARD 189.1SECTIONANNEX 1 FIGURE/TABLE/SECTIONASHRAE STANDARD 169 MATERIALSTATUS IN STANDARD 189.1
    Appendix AFigure Annex1-1Figure B-1, Climate Zones for United States CountiesInformative
    Appendix ASection Annex1-1Section A3 Climate Zone DefinitionsNormative
    Appendix ATable Annex1-1Table A-3 Thermal Climate Zone DefinitionsNormative

    Informative Note: Section references that appear in this annex are references to sections or appendices in ANSI/ASHRAE Standard 169.

    SECTION ANNEX101 (SECTION ANNEX 1-1)
    ASHRAE STANDARD 169-2013, SECTION A3:
    CLIMATE ZONE DEFINITIONS

    FIGURE ANNEX 101.1 (FIGURE ANNEX 1-1)

    ASHRAE STANDARD 169-2013, FIGURE B-1: CLIMATE ZONES FOR UNITED STATES COUNTIES.

    TABLE ANNEX 101.1 (TABLE ANNEX1-1)

    ASHRAE STANDARD 169-2013, TABLE A-3: THERMAL CLIMATE ZONE DEFINITIONS

    THERMAL ZONENAMEI-P UNITSSI UNITS
    0Extremely hot10,800 < CDD50°F6000 < CDD10°C
    1Very hot9000 < CDD50°F ≤ 10,8005000 < CDD10°C ≤ 6000
    2Hot6300 < CDD50°F ≤ 90003500 < CDD10°C ≤ 5000
    3WarmCDD50°F ≤ 6300 and HDD65°F ≤ 3600CDD10°C < 3500 and HDD18°C ≤ 2000
    4MixedCDD50°F ≤ 6300 and 3600 < HDD65°F ≤ 5400CDD10°C < 3500 and 2000 < HDD18°C ≤ 3000
    5CoolCDD50°F ≤ 6300 and 5400 < HDD65°F ≤ 7200CDD10°C ≤ 3500 and 3000 < HDD18°C ≤ 4000
    6Cold7200 < HDD65°F ≤ 90004000 < HDD18°C ≤ 5000
    7Very cold9000 < HDD65°F ≤ 126005000 < HDD18°C ≤ 7000
    8Subarctic/arctic12600 < HDD65°F7000 < HDD18°C

    SECTIONA301 (A3.)
    CLIMATE ZONE DEFINITIONS

    To determine the climate zones for locations not listed in this code, use the following information to determine climate zone numbers and letters.

    Determine the thermal climate zone, 0–8, from Table Annex 101.1 (1-1), using the heating and cooling degree-days for the location.

    Determine the moisture zone (Marine, Dry or Humid):

    1. a.If monthly average temperature and precipitation data are available, use the Marine, Dry, and Humid definitions below to determine the moisture zone (C, B, or A).

    2. b.If annual average temperature information (including degree-days) and annual precipitation (i.e. annual mean) are available, use the following to determine the moisture zone:

      1. 1.If thermal climate zone is 3 and CDD50°F ≤ 4500 (CDD10°C ≤ 2500), climate zone is Marine (3C).

      2. 2.If thermal climate zone is 4 and CDD50°F ≤ 2700 (CDD10°C ≤ 1500), climate zone is Marine (4C).

      3. 3.If thermal climate zone is 5 and CDD50°F ≤ 1800 (CDD10°C ≤ 1000), climate zone is Marine (5C).

      Use the third criteria below for determining the Dry/Humid threshold if not Marine (C).

    3. c.If only degree-day information is available, use the following to determine the moisture zone:

      1. 1.If thermal climate zone is 3 and CDD50°F ≤ 4500 (CDD10°C ≤ 2500), climate zone is Marine (3C).

      2. 2.If thermal climate zone is 4 and CDD50°F ≤ 2700 (CDD10°C ≤ 1500), climate zone is Marine (4C).

      3. 3.If thermal climate zone is 5 and CDD50°F ≤ 1800 (CDD10°C ≤ 1000), climate zone is Marine (5C).

    It is not possible to assign Dry/Humid splits in this case.

    Marine (C) Zone Definition—Locations meeting all four of the following criteria:

    1. a.Mean temperature of coldest month between 27°F (–3°C) and 65°F (18°C);

    2. b.Warmest month mean < 72°F (22°C);

    3. c.At least four months with mean temperatures over 50°F(10°C); and

    4. d.Dry season in summer. The month with the heaviest precipitation in the cold season has at least three times as much precipitation as the month with the least precipitation in the rest of the year. The cold season is October through March in the Northern Hemisphere and April through September in the Southern Hemisphere.

    Dry (B) Definition—Locations meeting the following criteria:

    1. a.Not Marine (C);

    2. b.If 70% or more of the precipitation, P, occurs during the high sun period, then the dry/humid threshold is:

      Annex 1 (I-P) Equation
      (I-P)
      Annex 1 (SI) Equation
      (SI)
    3. c.If between 30% and 70% of the precipitation, P, occurs during the high sun period, then the dry/humid threshold is:

      Annex 1 (I-P) Equation
      (I-P)
      Annex 1 (SI) Equation
      (SI)
    4. d.If 30% or less of the precipitation, P, occurs during the high sun period, then the dry/humid threshold is:

      Annex 1 (I-P) Equation
      (I-P)
      Annex 1 (SI) Equation
      (SI)

      where:

      P = annual precipitation, in. (mm).

      T = annual mean temperature, °F (°C).

      Summer or high sun period = April through September in the Northern Hemisphere and October through March in the Southern Hemisphere.

      Winter or cold season = October through March in the Northern Hemisphere and April through September in the Southern Hemisphere.

    Humid (A) Definition—Locations that are not Marine (C) and not Dry (B).