EnergyPlus History: CZ2025 DEER Weather Files

File	Start Date	End Date	Date posted	Notes
CZ2025_WeatherFiles.zip			2026 Mar 9	CZ2025 representative weather files for use in DEER building energy modeling. The zip file includes: (1) 16 California climate zones (CZ01–CZ16), one representative station per zone, and (2) for each zone: hourly weather (.epw), design days (.ddy), and optional summary/auxiliary files (.stat, .BINM, .FIN4). Note: CZ04 and CZ06 use the stations specified in the 2025 Energy Code Accounting Methodology (CEC-400-2024-004, TN 255318-1): Paso Robles Municipal Airport (WMO 723965) for CZ04 and Los Angeles International Airport / LAX (WMO 722950) for CZ06. All other zones use the representative stations from the 2025 Title 24 Reference Appendices (CEC-400-2025-010-AP). Source: (1) EPW data: CALMAC California Weather Files, CZ2025 dataset (TMY based on 2000–2020): https://www.calmac.org/weather.asp (2) DDY (design days): Climate.OneBuilding.org — California Climate Zones, California_CTZ_2025 set 1: https://climate.onebuilding.org/#gsc.tab=0 (3) Aligns with the weather set used in the CBECC compliance software for 2025 Title 24: https://github.com/NOR-Codes-Stds/CBECC/tree/main/Weather/2025