# Climate Design Data Workflow for New Orleans, LA

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

- Canonical: https://harth.build/resources/climate-data/climate-design-data-workflow-new-orleans-la/
- Last updated: 2026-08-31
- Data source: Licensed ASHRAE Climatic Design Information / Standard 169 station data plus the locally adopted energy code. Coordinates 29.9511° 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=-90.0715&latitude=29.9511&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 | 21.1 °C (2 m gridded climatology; not a design percentile) |
| Highest monthly maximum | 36.2 °C (June) (monthly climatological statistic) |
| Lowest monthly minimum | -4.8 °C (January) (monthly climatological statistic) |
| Annual relative humidity | 78.8% (2 m gridded climatology) |
| Annual corrected precipitation | 4.20 mm/day (climatological daily rate) |
| Annual wind speed | 4.21 m/s (10 m gridded climatology; not a structural design wind speed) |

## Direct answer

NASA POWER's 2001–2020 climatology at the New Orleans, LA reference point reports an annual mean 2 m temperature of 21.1 °C and relative humidity of 78.8%. The highest monthly maximum is 36.2 °C in June, while the lowest monthly minimum is -4.8 °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 4.20 mm/day and annual 10 m wind speed is 4.21 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 |

## New Orleans, LA 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 | 11.96 | 23.24 | -4.76 | 81.04 | 3.17 | 4.78 |
| February | 13.98 | 25.49 | 0.03 | 81.62 | 3.79 | 4.79 |
| March | 17.34 | 27.91 | 0.46 | 80.39 | 3.37 | 4.69 |
| April | 20.96 | 30.22 | 5.81 | 78.86 | 4.27 | 4.76 |
| May | 24.73 | 33.75 | 10.03 | 76.32 | 3.83 | 4.17 |
| June | 27.89 | 36.18 | 19.81 | 75.85 | 5.87 | 3.55 |
| July | 28.49 | 35.16 | 22.23 | 77.30 | 5.57 | 3.23 |
| August | 28.53 | 35.42 | 18.53 | 77.51 | 6.14 | 3.28 |
| September | 26.75 | 33.91 | 14.67 | 77.74 | 4.30 | 3.83 |
| October | 22.28 | 32.85 | 7.61 | 77.50 | 3.37 | 4.26 |
| November | 17.03 | 27.67 | 0.67 | 79.34 | 2.55 | 4.47 |
| December | 13.53 | 24.44 | -0.25 | 82.11 | 4.14 | 4.70 |

![Monthly mean, maximum and minimum air temperature for Climate Design Data Workflow for New Orleans, LA](https://efwwel0vyt9vy5so.public.blob.vercel-storage.com/images/climate-data/climate-design-data-workflow-new-orleans-la/chart-temperature-1344.webp)

*Monthly air temperature for Climate Design Data Workflow for New Orleans, LA, plotted from the table above.*

![Mean daily precipitation by month for Climate Design Data Workflow for New Orleans, LA](https://efwwel0vyt9vy5so.public.blob.vercel-storage.com/images/climate-data/climate-design-data-workflow-new-orleans-la/chart-precipitation-1344.webp)

*Mean daily precipitation for Climate Design Data Workflow for New Orleans, LA, plotted from the table above.*

## Month-by-month climate interpretation

- **January:** mean temperature 11.96 °C is 9.19 °C below the annual mean; the monthly max–min span is 28.00 °C. Relative humidity is 81.04% (2.25 points above annual), while corrected precipitation at 3.17 mm/day is 1.03 mm/day drier than the annual daily rate.
- **February:** mean temperature 13.98 °C is 7.17 °C below the annual mean; the monthly max–min span is 25.46 °C. Relative humidity is 81.62% (2.83 points above annual), while corrected precipitation at 3.79 mm/day is 0.41 mm/day drier than the annual daily rate.
- **March:** mean temperature 17.34 °C is 3.81 °C below the annual mean; the monthly max–min span is 27.45 °C. Relative humidity is 80.39% (1.60 points above annual), while corrected precipitation at 3.37 mm/day is 0.83 mm/day drier than the annual daily rate.
- **April:** mean temperature 20.96 °C is 0.19 °C below the annual mean; the monthly max–min span is 24.41 °C. Relative humidity is 78.86% (0.07 points above annual), while corrected precipitation at 4.27 mm/day is 0.07 mm/day wetter than the annual daily rate.
- **May:** mean temperature 24.73 °C is 3.58 °C above the annual mean; the monthly max–min span is 23.72 °C. Relative humidity is 76.32% (2.47 points below annual), while corrected precipitation at 3.83 mm/day is 0.37 mm/day drier than the annual daily rate.
- **June:** mean temperature 27.89 °C is 6.74 °C above the annual mean; the monthly max–min span is 16.37 °C. Relative humidity is 75.85% (2.94 points below annual), while corrected precipitation at 5.87 mm/day is 1.67 mm/day wetter than the annual daily rate.
- **July:** mean temperature 28.49 °C is 7.34 °C above the annual mean; the monthly max–min span is 12.93 °C. Relative humidity is 77.30% (1.49 points below annual), while corrected precipitation at 5.57 mm/day is 1.37 mm/day wetter than the annual daily rate.
- **August:** mean temperature 28.53 °C is 7.38 °C above the annual mean; the monthly max–min span is 16.89 °C. Relative humidity is 77.51% (1.28 points below annual), while corrected precipitation at 6.14 mm/day is 1.94 mm/day wetter than the annual daily rate.
- **September:** mean temperature 26.75 °C is 5.60 °C above the annual mean; the monthly max–min span is 19.24 °C. Relative humidity is 77.74% (1.05 points below annual), while corrected precipitation at 4.30 mm/day is 0.10 mm/day wetter than the annual daily rate.
- **October:** mean temperature 22.28 °C is 1.13 °C above the annual mean; the monthly max–min span is 25.24 °C. Relative humidity is 77.50% (1.29 points below annual), while corrected precipitation at 3.37 mm/day is 0.83 mm/day drier than the annual daily rate.
- **November:** mean temperature 17.03 °C is 4.12 °C below the annual mean; the monthly max–min span is 27.00 °C. Relative humidity is 79.34% (0.55 points above annual), while corrected precipitation at 2.55 mm/day is 1.65 mm/day drier than the annual daily rate.
- **December:** mean temperature 13.53 °C is 7.62 °C below the annual mean; the monthly max–min span is 24.69 °C. Relative humidity is 82.11% (3.32 points above annual), while corrected precipitation at 4.14 mm/day is 0.06 mm/day drier than the annual daily rate.

Harth retrieved this point climatology from NASA POWER API v2.9.7 for location record us:new-orleans-la. 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 Atlanta, GA](https://harth.build/resources/climate-data/climate-design-data-workflow-atlanta-ga.md)
- [Sun Path & Solar Angles for New Orleans, LA](https://harth.build/resources/solar-data/sun-path-and-solar-angles-new-orleans-la.md)

## Sources and method

Licensed ASHRAE Climatic Design Information / Standard 169 station data plus the locally adopted energy code. Coordinates 29.9511° 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=-90.0715&latitude=29.9511&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=-90.0715&latitude=29.9511&format=JSON)

## Frequently asked questions

### What does NASA POWER climatology show for New Orleans, LA?

For the New Orleans, LA reference point, the 2001–2020 NASA POWER climatology reports 21.1 °C annual mean temperature, 78.8% relative humidity and 4.20 mm/day corrected precipitation. The monthly maximum peaks at 36.2 °C in June.

### Can the New Orleans, LA climatology replace project design temperatures or an hourly weather file?

No. The New Orleans, LA response is gridded monthly climatology; its lowest monthly minimum of -4.8 °C in January 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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