# Climate Design Data Workflow for Austin, TX

> A source-first workflow for retrieving and recording building-design climate conditions for Austin, TX without mixing climate normals, code zones, and HVAC design percentiles.

- Canonical: https://harth.build/resources/climate-data/climate-design-data-workflow-austin-tx/
- Last updated: 2026-08-31
- Data source: 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](https://power.larc.nasa.gov/docs/services/api/temporal/climatology/) and [exact point response](https://power.larc.nasa.gov/api/temporal/climatology/point?parameters=T2M%2CT2M_MAX%2CT2M_MIN%2CRH2M%2CPRECTOTCORR%2CWS10M&community=SB&longitude=-97.7431&latitude=30.2672&format=JSON), 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.

## Key facts

| Fact | Value |
| --- | --- |
| NASA POWER climatology | 20-year Meteorological and Solar Monthly & Annual Climatologies (January 2001 - December 2020) (API v2.9.7; LST) |
| Annual mean temperature | 20.2 °C (2 m gridded climatology; not a design percentile) |
| Highest monthly maximum | 44.6 °C (July) (monthly climatological statistic) |
| Lowest monthly minimum | -8.5 °C (February) (monthly climatological statistic) |
| Annual relative humidity | 68.7% (2 m gridded climatology) |
| Annual corrected precipitation | 2.30 mm/day (climatological daily rate) |
| Annual wind speed | 4.25 m/s (10 m gridded climatology; not a structural design wind speed) |

## 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](https://www.linkedin.com/company/harth-build) · 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.

| Field | Required record |
| --- | --- |
| Station | Name, ID, coordinates and elevation |
| Source | Publisher, edition and licensed/public status |
| Heating | 99.6% and 99% dry-bulb |
| Cooling | 0.4%, 1% and 2% dry-bulb plus coincident wet-bulb |
| Moisture | Dew-point or humidity design condition used |
| Code | Adopted edition, amendments and effective date |

## Austin, TX NASA POWER monthly climate screening table

| Month | Mean °C | Monthly max °C | Monthly min °C | RH % | Precipitation mm/day | Wind at 10 m m/s |
| --- | ---: | ---: | ---: | ---: | ---: | ---: |
| January | 9.29 | 29.73 | -8.11 | 72.00 | 1.86 | 4.41 |
| February | 11.44 | 32.45 | -8.50 | 72.98 | 1.58 | 4.69 |
| March | 15.94 | 33.59 | -6.19 | 72.61 | 2.35 | 4.75 |
| April | 20.22 | 38.41 | 0.87 | 69.81 | 2.11 | 4.87 |
| May | 24.32 | 40.29 | 6.33 | 70.50 | 3.57 | 4.56 |
| June | 28.20 | 43.41 | 15.88 | 66.48 | 2.60 | 4.09 |
| July | 29.50 | 44.61 | 18.09 | 63.59 | 1.92 | 3.84 |
| August | 30.14 | 44.20 | 18.49 | 59.98 | 2.02 | 3.69 |
| September | 26.34 | 42.42 | 10.24 | 66.83 | 2.89 | 3.47 |
| October | 20.97 | 38.08 | 0.45 | 67.81 | 3.07 | 3.96 |
| November | 15.14 | 31.56 | -4.97 | 70.74 | 1.96 | 4.28 |
| December | 10.37 | 29.09 | -6.19 | 71.54 | 1.59 | 4.34 |

![Monthly mean, maximum and minimum air temperature for Climate Design Data Workflow for Austin, TX](https://efwwel0vyt9vy5so.public.blob.vercel-storage.com/images/climate-data/climate-design-data-workflow-austin-tx/chart-temperature-1344.webp)

*Monthly air temperature for Climate Design Data Workflow for Austin, TX, plotted from the table above.*

![Mean daily precipitation by month for Climate Design Data Workflow for Austin, TX](https://efwwel0vyt9vy5so.public.blob.vercel-storage.com/images/climate-data/climate-design-data-workflow-austin-tx/chart-precipitation-1344.webp)

*Mean daily precipitation for Climate Design Data Workflow for Austin, TX, plotted from the table above.*

## 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](https://harth.build/resources/climate-data.md)
- [ASHRAE / IECC Climate Zones Explained (Zones 1–8, A/B/C)](https://harth.build/resources/climate-data/ashrae-climate-zones-explained.md)
- [Heating & Cooling Design Temperatures (99%, 1% / 0.4%)](https://harth.build/resources/climate-data/heating-and-cooling-design-temperatures.md)
- [Climate Design Data Workflow for Houston, TX](https://harth.build/resources/climate-data/climate-design-data-workflow-houston-tx.md)
- [Climate Design Data Workflow for Dallas, TX](https://harth.build/resources/climate-data/climate-design-data-workflow-dallas-tx.md)
- [Sun Path & Solar Angles for Austin, TX](https://harth.build/resources/solar-data/sun-path-and-solar-angles-austin-tx.md)
- [Zoning in Austin, TX: District Families & Illustrative Standards](https://harth.build/resources/zoning/zoning-in-austin-tx.md)

## 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](https://power.larc.nasa.gov/docs/services/api/temporal/climatology/) and [exact point response](https://power.larc.nasa.gov/api/temporal/climatology/point?parameters=T2M%2CT2M_MAX%2CT2M_MIN%2CRH2M%2CPRECTOTCORR%2CWS10M&community=SB&longitude=-97.7431&latitude=30.2672&format=JSON), 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](https://power.larc.nasa.gov/docs/services/api/temporal/climatology/)

- [power.larc.nasa.gov](https://power.larc.nasa.gov/api/temporal/climatology/point?parameters=T2M%2CT2M_MAX%2CT2M_MIN%2CRH2M%2CPRECTOTCORR%2CWS10M&community=SB&longitude=-97.7431&latitude=30.2672&format=JSON)

## Frequently asked questions

### What does NASA POWER climatology show for Austin, TX?

For the Austin, TX reference point, the 2001–2020 NASA POWER climatology reports 20.2 °C annual mean temperature, 68.7% relative humidity and 2.30 mm/day corrected precipitation. The monthly maximum peaks at 44.6 °C in July.

### Can the Austin, TX climatology replace project design temperatures or an hourly weather file?

No. The Austin, TX response is gridded monthly climatology; its lowest monthly minimum of -8.5 °C in February is not a code percentile or observed site extreme. Verify elevation, local exposure, the required weather file or design-condition source and the current adopted code.

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