# Climate Design Data Workflow for Nashville, TN

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

- Canonical: https://harth.build/resources/climate-data/climate-design-data-workflow-nashville-tn/
- Last updated: 2026-08-31
- Data source: Licensed ASHRAE Climatic Design Information / Standard 169 station data plus the locally adopted energy code. Coordinates 36.1627° 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=-86.7816&latitude=36.1627&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 | 14.9 °C (2 m gridded climatology; not a design percentile) |
| Highest monthly maximum | 42.7 °C (June) (monthly climatological statistic) |
| Lowest monthly minimum | -18.2 °C (February) (monthly climatological statistic) |
| Annual relative humidity | 77.8% (2 m gridded climatology) |
| Annual corrected precipitation | 3.70 mm/day (climatological daily rate) |
| Annual wind speed | 3.15 m/s (10 m gridded climatology; not a structural design wind speed) |

## Direct answer

NASA POWER's 2001–2020 climatology at the Nashville, TN reference point reports an annual mean 2 m temperature of 14.9 °C and relative humidity of 77.8%. The highest monthly maximum is 42.7 °C in June, while the lowest monthly minimum is -18.2 °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 3.70 mm/day and annual 10 m wind speed is 3.15 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 |

## Nashville, TN 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 | 2.30 | 21.76 | -16.56 | 84.13 | 3.30 | 3.77 |
| February | 4.23 | 23.23 | -18.23 | 84.18 | 4.58 | 3.90 |
| March | 9.33 | 27.46 | -14.68 | 82.50 | 3.71 | 3.85 |
| April | 14.79 | 29.49 | -5.74 | 79.56 | 4.25 | 3.78 |
| May | 19.61 | 32.85 | 1.63 | 80.30 | 4.16 | 3.01 |
| June | 24.07 | 42.74 | 9.98 | 77.15 | 3.40 | 2.48 |
| July | 26.08 | 41.44 | 12.12 | 74.17 | 4.00 | 2.21 |
| August | 26.02 | 42.11 | 10.71 | 69.90 | 3.29 | 2.26 |
| September | 22.37 | 38.97 | 4.38 | 69.64 | 3.07 | 2.62 |
| October | 15.64 | 37.77 | -2.89 | 71.76 | 3.26 | 3.06 |
| November | 8.90 | 30.71 | -11.77 | 76.29 | 3.33 | 3.37 |
| December | 4.34 | 23.23 | -17.76 | 83.97 | 4.08 | 3.53 |

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

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

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

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

## Month-by-month climate interpretation

- **January:** mean temperature 2.30 °C is 12.56 °C below the annual mean; the monthly max–min span is 38.32 °C. Relative humidity is 84.13% (6.36 points above annual), while corrected precipitation at 3.30 mm/day is 0.40 mm/day drier than the annual daily rate.
- **February:** mean temperature 4.23 °C is 10.63 °C below the annual mean; the monthly max–min span is 41.46 °C. Relative humidity is 84.18% (6.41 points above annual), while corrected precipitation at 4.58 mm/day is 0.88 mm/day wetter than the annual daily rate.
- **March:** mean temperature 9.33 °C is 5.53 °C below the annual mean; the monthly max–min span is 42.14 °C. Relative humidity is 82.50% (4.73 points above annual), while corrected precipitation at 3.71 mm/day is 0.01 mm/day wetter than the annual daily rate.
- **April:** mean temperature 14.79 °C is 0.07 °C below the annual mean; the monthly max–min span is 35.23 °C. Relative humidity is 79.56% (1.79 points above annual), while corrected precipitation at 4.25 mm/day is 0.55 mm/day wetter than the annual daily rate.
- **May:** mean temperature 19.61 °C is 4.75 °C above the annual mean; the monthly max–min span is 31.22 °C. Relative humidity is 80.30% (2.53 points above annual), while corrected precipitation at 4.16 mm/day is 0.46 mm/day wetter than the annual daily rate.
- **June:** mean temperature 24.07 °C is 9.21 °C above the annual mean; the monthly max–min span is 32.76 °C. Relative humidity is 77.15% (0.62 points below annual), while corrected precipitation at 3.40 mm/day is 0.30 mm/day drier than the annual daily rate.
- **July:** mean temperature 26.08 °C is 11.22 °C above the annual mean; the monthly max–min span is 29.32 °C. Relative humidity is 74.17% (3.60 points below annual), while corrected precipitation at 4.00 mm/day is 0.30 mm/day wetter than the annual daily rate.
- **August:** mean temperature 26.02 °C is 11.16 °C above the annual mean; the monthly max–min span is 31.40 °C. Relative humidity is 69.90% (7.87 points below annual), while corrected precipitation at 3.29 mm/day is 0.41 mm/day drier than the annual daily rate.
- **September:** mean temperature 22.37 °C is 7.51 °C above the annual mean; the monthly max–min span is 34.59 °C. Relative humidity is 69.64% (8.13 points below annual), while corrected precipitation at 3.07 mm/day is 0.63 mm/day drier than the annual daily rate.
- **October:** mean temperature 15.64 °C is 0.78 °C above the annual mean; the monthly max–min span is 40.66 °C. Relative humidity is 71.76% (6.01 points below annual), while corrected precipitation at 3.26 mm/day is 0.44 mm/day drier than the annual daily rate.
- **November:** mean temperature 8.90 °C is 5.96 °C below the annual mean; the monthly max–min span is 42.48 °C. Relative humidity is 76.29% (1.48 points below annual), while corrected precipitation at 3.33 mm/day is 0.37 mm/day drier than the annual daily rate.
- **December:** mean temperature 4.34 °C is 10.52 °C below the annual mean; the monthly max–min span is 40.99 °C. Relative humidity is 83.97% (6.20 points above annual), while corrected precipitation at 4.08 mm/day is 0.38 mm/day wetter than the annual daily rate.

Harth retrieved this point climatology from NASA POWER API v2.9.7 for location record us:nashville-tn. 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 Atlanta, GA](https://harth.build/resources/climate-data/climate-design-data-workflow-atlanta-ga.md)
- [Climate Design Data Workflow for Chicago, IL](https://harth.build/resources/climate-data/climate-design-data-workflow-chicago-il.md)
- [Sun Path & Solar Angles for Nashville, TN](https://harth.build/resources/solar-data/sun-path-and-solar-angles-nashville-tn.md)

## Sources and method

Licensed ASHRAE Climatic Design Information / Standard 169 station data plus the locally adopted energy code. Coordinates 36.1627° 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=-86.7816&latitude=36.1627&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=-86.7816&latitude=36.1627&format=JSON)

## Frequently asked questions

### What does NASA POWER climatology show for Nashville, TN?

For the Nashville, TN reference point, the 2001–2020 NASA POWER climatology reports 14.9 °C annual mean temperature, 77.8% relative humidity and 3.70 mm/day corrected precipitation. The monthly maximum peaks at 42.7 °C in June.

### Can the Nashville, TN climatology replace project design temperatures or an hourly weather file?

No. The Nashville, TN response is gridded monthly climatology; its lowest monthly minimum of -18.2 °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.

---

- Continue in Harth (open this topic in the Harth agent): https://app.harth.build/?context=%2Fresources%2Fclimate-data%2Fclimate-design-data-workflow-nashville-tn%2F
- View this page in a browser: https://harth.build/resources/climate-data/climate-design-data-workflow-nashville-tn/
- All resources for agents: https://harth.build/llms.txt