California Building Climate Zones

Building Climates Zones of California Climate Zone Descriptions for New Buildings - California is divided into 16 climatic boundaries or climate zones, which is incorporated into the Energy Efficiency Standards (Energy Code). Each Climate zone has a unique climatic condition that dictates which minimum efficiency requirements are needed for that specific climate zone. The numbers used in the climate zone map don't have a title or legend. The California climate zones shown in this map are not the same as what we commonly call climate areas such as "desert" or "alpine" climates. The climate zones are based on energy use, temperature, weather and other factors.This is explained in the Title 24 energy efficiency standards glossary section:"The Energy Commission established 16 climate zones that represent a geographic area for which an energy budget is established. These energy budgets are the basis for the standards...." "(An) energy budget is the maximum amount of energy that a building, or portion of a building...can be designed to consume per year.""The Energy Commission originally developed weather data for each climate zone by using unmodified (but error-screened) data for a representative city and weather year (representative months from various years). The Energy Commission analyzed weather data from weather stations selected for (1) reliability of data, (2) currency of data, (3) proximity to population centers, and (4) non-duplication of stations within a climate zone."Using this information, they created representative temperature data for each zone. The remainder of the weather data for each zone is still that of the representative city." The representative city for each climate zone (CZ) is:CZ 1: ArcataCZ 2: Santa RosaCZ 3: OaklandCZ 4: San Jose-ReidCZ 5: Santa MariaCZ 6: TorranceCZ 7: San Diego-LindberghCZ 8: FullertonCZ 9: Burbank-GlendaleCZ10: RiversideCZ11: Red BluffCZ12: SacramentoCZ13: FresnoCZ14: PalmdaleCZ15: Palm Spring-IntlCZ16: Blue Canyon

Data e Risorse

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identifier	fd8fc730-776e-4d06-a41b-9173fd99df8c
issued	2017-09-29T14:17:49.000Z
license	http://www.opendefinition.org/licenses/cc-by
modified	2021-12-02T22:19:39.949Z
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maintainer_email	gis@energy.ca.gov
metadata_created	2025-09-25T00:45:46.117589
metadata_modified	2025-09-25T00:45:46.117598
notes	<p><font color='#231f20'>Building Climates Zones of California Climate Zone Descriptions for New Buildings - California is divided into 16 climatic boundaries or climate zones, which is incorporated into the Energy Efficiency Standards (Energy Code). Each Climate zone has a unique climatic condition that dictates which minimum efficiency requirements are needed for that specific climate zone. </font><br /></p><p><span style='color:rgb(35, 31, 32);'>The numbers used in the climate zone map don't have a title or legend. The California climate zones shown in this map are not the same as what we commonly call climate areas such as "desert" or "alpine" climates. The climate zones are based on energy use, temperature, weather and other factors.</span></p><p><font color='#231f20'>This is explained in the Title 24 energy efficiency standards glossary section:</font></p><p><span style='color:rgb(35, 31, 32);'>"The Energy Commission established 16 climate zones that represent a geographic area for which an energy budget is established. These energy budgets are the basis for the standards...." "(An) energy budget is the maximum amount of energy that a building, or portion of a building...can be designed to consume per year."</span></p><p><font color='#231f20'>"The Energy Commission originally developed weather data for each climate zone by using unmodified (but error-screened) data for a representative city and weather year (representative months from various years). The Energy Commission analyzed weather data from weather stations selected for (1) reliability of data, (2) currency of data, (3) proximity to population centers, and (4) non-duplication of stations within a climate zone.</font></p><p><span style='color:rgb(35, 31, 32);'>"Using this information, they created representative temperature data for each zone. The remainder of the weather data for each zone is still that of the representative city." The representative city for each climate zone (CZ) is:</span></p><p style='text-align:left;'></p><ul><li><span style='color:rgb(35, 31, 32);'>CZ 1: Arcata</span></li><li><font color='#231f20'>CZ 2: Santa Rosa</font></li><li><font color='#231f20'>CZ 3: Oakland</font></li><li><font color='#231f20'>CZ 4: San Jose-Reid</font></li><li><font color='#231f20'>CZ 5: Santa Maria</font></li><li><font color='#231f20'>CZ 6: Torrance</font></li><li><font color='#231f20'>CZ 7: San Diego-Lindbergh</font></li><li><font color='#231f20'>CZ 8: Fullerton</font></li><li><font color='#231f20'>CZ 9: Burbank-Glendale</font></li><li><font color='#231f20'>CZ10: Riverside</font></li><li><font color='#231f20'>CZ11: Red Bluff</font></li><li><font color='#231f20'>CZ12: Sacramento</font></li><li><font color='#231f20'>CZ13: Fresno</font></li><li><font color='#231f20'>CZ14: Palmdale</font></li><li><font color='#231f20'>CZ15: Palm Spring-Intl</font></li><li><font color='#231f20'>CZ16: Blue Canyon</font></li></ul>
num_resources	11
num_tags	15
title	California Building Climate Zones