Climate Design Data Workflow for Austin, TX

Direct answer

NASA POWER's 2001–2020 climatology at the Austin, TX reference point reports an annual mean 2 m temperature of 20.2 °C and relative humidity of 68.7%. The highest monthly maximum is 44.6 °C in July, while the lowest monthly minimum is -8.5 °C in February; 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 2.30 mm/day and annual 10 m wind speed is 4.25 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.

Austin, TX NASA POWER monthly climate screening table

Month-by-month climate interpretation

• January: mean temperature 9.29 °C is 10.91 °C below the annual mean; the monthly max–min span is 37.84 °C. Relative humidity is 72.00% (3.29 points above annual), while corrected precipitation at 1.86 mm/day is 0.44 mm/day drier than the annual daily rate.
• February: mean temperature 11.44 °C is 8.76 °C below the annual mean; the monthly max–min span is 40.95 °C. Relative humidity is 72.98% (4.27 points above annual), while corrected precipitation at 1.58 mm/day is 0.72 mm/day drier than the annual daily rate.
• March: mean temperature 15.94 °C is 4.26 °C below the annual mean; the monthly max–min span is 39.78 °C. Relative humidity is 72.61% (3.90 points above annual), while corrected precipitation at 2.35 mm/day is 0.05 mm/day wetter than the annual daily rate.
• April: mean temperature 20.22 °C is 0.02 °C above the annual mean; the monthly max–min span is 37.54 °C. Relative humidity is 69.81% (1.10 points above annual), while corrected precipitation at 2.11 mm/day is 0.19 mm/day drier than the annual daily rate.
• May: mean temperature 24.32 °C is 4.12 °C above the annual mean; the monthly max–min span is 33.96 °C. Relative humidity is 70.50% (1.79 points above annual), while corrected precipitation at 3.57 mm/day is 1.27 mm/day wetter than the annual daily rate.
• June: mean temperature 28.20 °C is 8.00 °C above the annual mean; the monthly max–min span is 27.53 °C. Relative humidity is 66.48% (2.23 points below annual), while corrected precipitation at 2.60 mm/day is 0.30 mm/day wetter than the annual daily rate.
• July: mean temperature 29.50 °C is 9.30 °C above the annual mean; the monthly max–min span is 26.52 °C. Relative humidity is 63.59% (5.12 points below annual), while corrected precipitation at 1.92 mm/day is 0.38 mm/day drier than the annual daily rate.
• August: mean temperature 30.14 °C is 9.94 °C above the annual mean; the monthly max–min span is 25.71 °C. Relative humidity is 59.98% (8.73 points below annual), while corrected precipitation at 2.02 mm/day is 0.28 mm/day drier than the annual daily rate.
• September: mean temperature 26.34 °C is 6.14 °C above the annual mean; the monthly max–min span is 32.18 °C. Relative humidity is 66.83% (1.88 points below annual), while corrected precipitation at 2.89 mm/day is 0.59 mm/day wetter than the annual daily rate.
• October: mean temperature 20.97 °C is 0.77 °C above the annual mean; the monthly max–min span is 37.63 °C. Relative humidity is 67.81% (0.90 points below annual), while corrected precipitation at 3.07 mm/day is 0.77 mm/day wetter than the annual daily rate.
• November: mean temperature 15.14 °C is 5.06 °C below the annual mean; the monthly max–min span is 36.53 °C. Relative humidity is 70.74% (2.03 points above annual), while corrected precipitation at 1.96 mm/day is 0.34 mm/day drier than the annual daily rate.
• December: mean temperature 10.37 °C is 9.83 °C below the annual mean; the monthly max–min span is 35.28 °C. Relative humidity is 71.54% (2.83 points above annual), while corrected precipitation at 1.59 mm/day is 0.71 mm/day drier than the annual daily rate.

Harth retrieved this point climatology from NASA POWER API v2.9.7 for location record us:austin-tx. 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 Houston, TX
• Climate Design Data Workflow for Dallas, TX
• Sun Path & Solar Angles for Austin, TX
• Zoning in Austin, TX: District Families & Illustrative Standards

Sources and method

Licensed ASHRAE Climatic Design Information / Standard 169 station data plus the locally adopted energy code. Coordinates 30.2672° N (America/Chicago) 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