Climate Design Data Workflow for Los Angeles, CA

Direct answer

NASA POWER's 2001–2020 climatology at the Los Angeles, CA reference point reports an annual mean 2 m temperature of 17.4 °C and relative humidity of 56.7%. The highest monthly maximum is 42.3 °C in July, while the lowest monthly minimum is -1.0 °C in January; these are screening statistics, not code design temperatures. The point response uses LST and the 20-year Meteorological and Solar Monthly & Annual Climatologies (January 2001 - December 2020); its annual corrected precipitation is 0.91 mm/day and annual 10 m wind speed is 2.83 m/s. Use the monthly series to screen source selection before applying project design conditions. NASA POWER is gridded climatology: verify elevation, microclimate, urban exposure, station or weather-file suitability, current code edition and the authority's required source before design use.

Content and cited inputs reviewed by Harth team · Published 2026-08-17 · Updated 2026-08-31.

Which climate inputs control the design?

1. Confirm the project jurisdiction and adopted energy-code edition.
2. Select the authoritative station and record why it applies.
3. Record heating dry-bulb percentiles and cooling dry-bulb with coincident moisture conditions.
4. Keep IP/SI units, edition, observation period and retrieval date with every value.
5. Separate climate-zone envelope requirements from HVAC sizing conditions.

Los Angeles, CA NASA POWER monthly climate screening table

Month-by-month climate interpretation

• January: mean temperature 12.04 °C is 5.32 °C below the annual mean; the monthly max–min span is 31.42 °C. Relative humidity is 59.46% (2.77 points above annual), while corrected precipitation at 2.35 mm/day is 1.44 mm/day wetter than the annual daily rate.
• February: mean temperature 12.15 °C is 5.21 °C below the annual mean; the monthly max–min span is 30.04 °C. Relative humidity is 62.98% (6.29 points above annual), while corrected precipitation at 2.67 mm/day is 1.76 mm/day wetter than the annual daily rate.
• March: mean temperature 13.78 °C is 3.58 °C below the annual mean; the monthly max–min span is 28.68 °C. Relative humidity is 64.06% (7.37 points above annual), while corrected precipitation at 1.35 mm/day is 0.44 mm/day wetter than the annual daily rate.
• April: mean temperature 15.10 °C is 2.26 °C below the annual mean; the monthly max–min span is 32.16 °C. Relative humidity is 62.71% (6.02 points above annual), while corrected precipitation at 0.63 mm/day is 0.28 mm/day drier than the annual daily rate.
• May: mean temperature 17.53 °C is 0.17 °C above the annual mean; the monthly max–min span is 28.72 °C. Relative humidity is 61.70% (5.01 points above annual), while corrected precipitation at 0.28 mm/day is 0.63 mm/day drier than the annual daily rate.
• June: mean temperature 20.35 °C is 2.99 °C above the annual mean; the monthly max–min span is 31.85 °C. Relative humidity is 56.98% (0.29 points above annual), while corrected precipitation at 0.02 mm/day is 0.89 mm/day drier than the annual daily rate.
• July: mean temperature 23.41 °C is 6.05 °C above the annual mean; the monthly max–min span is 29.51 °C. Relative humidity is 51.54% (5.15 points below annual), while corrected precipitation at 0.07 mm/day is 0.84 mm/day drier than the annual daily rate.
• August: mean temperature 23.88 °C is 6.52 °C above the annual mean; the monthly max–min span is 26.23 °C. Relative humidity is 48.63% (8.06 points below annual), while corrected precipitation at 0.03 mm/day is 0.88 mm/day drier than the annual daily rate.
• September: mean temperature 23.03 °C is 5.67 °C above the annual mean; the monthly max–min span is 30.44 °C. Relative humidity is 49.58% (7.11 points below annual), while corrected precipitation at 0.11 mm/day is 0.80 mm/day drier than the annual daily rate.
• October: mean temperature 19.47 °C is 2.11 °C above the annual mean; the monthly max–min span is 31.02 °C. Relative humidity is 52.22% (4.47 points below annual), while corrected precipitation at 0.54 mm/day is 0.37 mm/day drier than the annual daily rate.
• November: mean temperature 15.49 °C is 1.87 °C below the annual mean; the monthly max–min span is 31.51 °C. Relative humidity is 52.50% (4.19 points below annual), while corrected precipitation at 0.84 mm/day is 0.07 mm/day drier than the annual daily rate.
• December: mean temperature 11.78 °C is 5.58 °C below the annual mean; the monthly max–min span is 27.03 °C. Relative humidity is 58.41% (1.72 points above annual), while corrected precipitation at 2.10 mm/day is 1.19 mm/day wetter than the annual daily rate.

Harth retrieved this point climatology from NASA POWER API v2.9.7 for location record us:los-angeles-ca. It is a reproducible screening dataset, not an hourly weather file, forecast, code design condition or substitute for local professional review.

Where can you explore related guidance?

• Explore all climate data guidance
• ASHRAE / IECC Climate Zones Explained (Zones 1–8, A/B/C)
• Heating & Cooling Design Temperatures (99%, 1% / 0.4%)
• Climate Design Data Workflow for San Diego, CA
• Climate Design Data Workflow for Las Vegas, NV
• Building Permits in Los Angeles, CA (LADBS Overview, 2026)
• Sun Path & Solar Angles for Los Angeles, CA

Sources and method

Licensed ASHRAE Climatic Design Information / Standard 169 station data plus the locally adopted energy code. Coordinates 34.0522° N (America/Los_Angeles) are approximate routing references. Figures are illustrative — confirm the representative station and current edition. Climate screening data from the NASA POWER Climatology API documentation and exact point response, retrieved 2026-08-31; source period: 20-year Meteorological and Solar Monthly & Annual Climatologies (January 2001 - December 2020). NASA POWER values are gridded screening statistics, not code design conditions or guaranteed local observations.

Source links

• power.larc.nasa.gov

• power.larc.nasa.gov