# Climate Design Data Workflow for Atlanta, GA

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

- Canonical: https://harth.build/resources/climate-data/climate-design-data-workflow-atlanta-ga/
- Last updated: 2026-08-31
- Data source: Licensed ASHRAE Climatic Design Information / Standard 169 station data plus the locally adopted energy code. Coordinates 33.7490° N (America/New_York) 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=-84.388&latitude=33.749&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 | 16.7 °C (2 m gridded climatology; not a design percentile) |
| Highest monthly maximum | 42.4 °C (June) (monthly climatological statistic) |
| Lowest monthly minimum | -13.6 °C (January) (monthly climatological statistic) |
| Annual relative humidity | 75.8% (2 m gridded climatology) |
| Annual corrected precipitation | 3.45 mm/day (climatological daily rate) |
| Annual wind speed | 2.67 m/s (10 m gridded climatology; not a structural design wind speed) |

## Direct answer

NASA POWER's 2001–2020 climatology at the Atlanta, GA reference point reports an annual mean 2 m temperature of 16.7 °C and relative humidity of 75.8%. The highest monthly maximum is 42.4 °C in June, while the lowest monthly minimum is -13.6 °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 3.45 mm/day and annual 10 m wind speed is 2.67 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 |

## Atlanta, GA 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 | 5.36 | 24.07 | -13.56 | 82.07 | 3.31 | 3.17 |
| February | 7.47 | 25.66 | -9.29 | 82.42 | 4.20 | 3.19 |
| March | 11.71 | 28.69 | -8.28 | 80.63 | 3.86 | 3.18 |
| April | 16.23 | 32.88 | -3.63 | 77.94 | 3.32 | 3.01 |
| May | 20.96 | 35.70 | 3.47 | 75.26 | 3.05 | 2.56 |
| June | 25.22 | 42.44 | 11.34 | 72.65 | 3.61 | 2.14 |
| July | 26.91 | 41.66 | 14.07 | 70.65 | 3.80 | 1.98 |
| August | 26.60 | 40.82 | 13.31 | 70.38 | 3.24 | 1.98 |
| September | 23.35 | 39.30 | 5.79 | 70.31 | 3.07 | 2.40 |
| October | 17.36 | 38.68 | -1.75 | 71.64 | 2.67 | 2.65 |
| November | 11.03 | 29.68 | -6.64 | 74.44 | 3.13 | 2.86 |
| December | 7.18 | 25.51 | -8.47 | 82.20 | 4.19 | 3.00 |

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

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

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

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

## Month-by-month climate interpretation

- **January:** mean temperature 5.36 °C is 11.30 °C below the annual mean; the monthly max–min span is 37.63 °C. Relative humidity is 82.07% (6.22 points above annual), while corrected precipitation at 3.31 mm/day is 0.14 mm/day drier than the annual daily rate.
- **February:** mean temperature 7.47 °C is 9.19 °C below the annual mean; the monthly max–min span is 34.95 °C. Relative humidity is 82.42% (6.57 points above annual), while corrected precipitation at 4.20 mm/day is 0.75 mm/day wetter than the annual daily rate.
- **March:** mean temperature 11.71 °C is 4.95 °C below the annual mean; the monthly max–min span is 36.97 °C. Relative humidity is 80.63% (4.78 points above annual), while corrected precipitation at 3.86 mm/day is 0.41 mm/day wetter than the annual daily rate.
- **April:** mean temperature 16.23 °C is 0.43 °C below the annual mean; the monthly max–min span is 36.51 °C. Relative humidity is 77.94% (2.09 points above annual), while corrected precipitation at 3.32 mm/day is 0.13 mm/day drier than the annual daily rate.
- **May:** mean temperature 20.96 °C is 4.30 °C above the annual mean; the monthly max–min span is 32.23 °C. Relative humidity is 75.26% (0.59 points below annual), while corrected precipitation at 3.05 mm/day is 0.40 mm/day drier than the annual daily rate.
- **June:** mean temperature 25.22 °C is 8.56 °C above the annual mean; the monthly max–min span is 31.10 °C. Relative humidity is 72.65% (3.20 points below annual), while corrected precipitation at 3.61 mm/day is 0.16 mm/day wetter than the annual daily rate.
- **July:** mean temperature 26.91 °C is 10.25 °C above the annual mean; the monthly max–min span is 27.59 °C. Relative humidity is 70.65% (5.20 points below annual), while corrected precipitation at 3.80 mm/day is 0.35 mm/day wetter than the annual daily rate.
- **August:** mean temperature 26.60 °C is 9.94 °C above the annual mean; the monthly max–min span is 27.51 °C. Relative humidity is 70.38% (5.47 points below annual), while corrected precipitation at 3.24 mm/day is 0.21 mm/day drier than the annual daily rate.
- **September:** mean temperature 23.35 °C is 6.69 °C above the annual mean; the monthly max–min span is 33.51 °C. Relative humidity is 70.31% (5.54 points below annual), while corrected precipitation at 3.07 mm/day is 0.38 mm/day drier than the annual daily rate.
- **October:** mean temperature 17.36 °C is 0.70 °C above the annual mean; the monthly max–min span is 40.43 °C. Relative humidity is 71.64% (4.21 points below annual), while corrected precipitation at 2.67 mm/day is 0.78 mm/day drier than the annual daily rate.
- **November:** mean temperature 11.03 °C is 5.63 °C below the annual mean; the monthly max–min span is 36.32 °C. Relative humidity is 74.44% (1.41 points below annual), while corrected precipitation at 3.13 mm/day is 0.32 mm/day drier than the annual daily rate.
- **December:** mean temperature 7.18 °C is 9.48 °C below the annual mean; the monthly max–min span is 33.98 °C. Relative humidity is 82.20% (6.35 points above annual), while corrected precipitation at 4.19 mm/day is 0.74 mm/day wetter than the annual daily rate.

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

## Sources and method

Licensed ASHRAE Climatic Design Information / Standard 169 station data plus the locally adopted energy code. Coordinates 33.7490° N (America/New_York) 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=-84.388&latitude=33.749&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=-84.388&latitude=33.749&format=JSON)

## Frequently asked questions

### What does NASA POWER climatology show for Atlanta, GA?

For the Atlanta, GA reference point, the 2001–2020 NASA POWER climatology reports 16.7 °C annual mean temperature, 75.8% relative humidity and 3.45 mm/day corrected precipitation. The monthly maximum peaks at 42.4 °C in June.

### Can the Atlanta, GA climatology replace project design temperatures or an hourly weather file?

No. The Atlanta, GA response is gridded monthly climatology; its lowest monthly minimum of -13.6 °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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