# Climate Design Data Workflow for Honolulu, HI

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

- Canonical: https://harth.build/resources/climate-data/climate-design-data-workflow-honolulu-hi/
- Last updated: 2026-08-31
- Data source: Licensed ASHRAE Climatic Design Information / Standard 169 station data plus the locally adopted energy code. Coordinates 21.3099° N (Pacific/Honolulu) 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=-157.8583&latitude=21.3099&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 | 24.6 °C (2 m gridded climatology; not a design percentile) |
| Highest monthly maximum | 30.6 °C (September) (monthly climatological statistic) |
| Lowest monthly minimum | 17.9 °C (March) (monthly climatological statistic) |
| Annual relative humidity | 74.9% (2 m gridded climatology) |
| Annual corrected precipitation | 2.11 mm/day (climatological daily rate) |
| Annual wind speed | 6.28 m/s (10 m gridded climatology; not a structural design wind speed) |

## Direct answer

NASA POWER's 2001–2020 climatology at the Honolulu, HI reference point reports an annual mean 2 m temperature of 24.6 °C and relative humidity of 74.9%. The highest monthly maximum is 30.6 °C in September, while the lowest monthly minimum is 17.9 °C in March; 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 2.11 mm/day and annual 10 m wind speed is 6.28 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 |

## Honolulu, HI 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 | 23.02 | 26.39 | 18.87 | 75.40 | 2.30 | 5.50 |
| February | 22.67 | 26.57 | 18.01 | 74.96 | 2.91 | 5.93 |
| March | 22.88 | 26.81 | 17.87 | 75.39 | 3.03 | 6.03 |
| April | 23.60 | 27.22 | 19.08 | 75.19 | 1.79 | 6.49 |
| May | 24.57 | 28.86 | 20.07 | 74.31 | 1.50 | 5.89 |
| June | 25.36 | 29.50 | 22.42 | 74.12 | 1.24 | 6.99 |
| July | 25.91 | 30.21 | 22.78 | 74.32 | 1.29 | 7.25 |
| August | 26.28 | 29.98 | 23.51 | 74.04 | 1.43 | 7.05 |
| September | 26.38 | 30.57 | 23.55 | 73.50 | 1.68 | 6.32 |
| October | 25.91 | 29.96 | 22.35 | 74.98 | 2.37 | 5.77 |
| November | 24.86 | 28.46 | 21.32 | 75.92 | 2.87 | 6.15 |
| December | 23.70 | 27.44 | 19.01 | 76.72 | 2.99 | 6.01 |

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

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

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

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

## Month-by-month climate interpretation

- **January:** mean temperature 23.02 °C is 1.59 °C below the annual mean; the monthly max–min span is 7.52 °C. Relative humidity is 75.40% (0.50 points above annual), while corrected precipitation at 2.30 mm/day is 0.19 mm/day wetter than the annual daily rate.
- **February:** mean temperature 22.67 °C is 1.94 °C below the annual mean; the monthly max–min span is 8.56 °C. Relative humidity is 74.96% (0.06 points above annual), while corrected precipitation at 2.91 mm/day is 0.80 mm/day wetter than the annual daily rate.
- **March:** mean temperature 22.88 °C is 1.73 °C below the annual mean; the monthly max–min span is 8.94 °C. Relative humidity is 75.39% (0.49 points above annual), while corrected precipitation at 3.03 mm/day is 0.92 mm/day wetter than the annual daily rate.
- **April:** mean temperature 23.60 °C is 1.01 °C below the annual mean; the monthly max–min span is 8.14 °C. Relative humidity is 75.19% (0.29 points above annual), while corrected precipitation at 1.79 mm/day is 0.32 mm/day drier than the annual daily rate.
- **May:** mean temperature 24.57 °C is 0.04 °C below the annual mean; the monthly max–min span is 8.79 °C. Relative humidity is 74.31% (0.59 points below annual), while corrected precipitation at 1.50 mm/day is 0.61 mm/day drier than the annual daily rate.
- **June:** mean temperature 25.36 °C is 0.75 °C above the annual mean; the monthly max–min span is 7.08 °C. Relative humidity is 74.12% (0.78 points below annual), while corrected precipitation at 1.24 mm/day is 0.87 mm/day drier than the annual daily rate.
- **July:** mean temperature 25.91 °C is 1.30 °C above the annual mean; the monthly max–min span is 7.43 °C. Relative humidity is 74.32% (0.58 points below annual), while corrected precipitation at 1.29 mm/day is 0.82 mm/day drier than the annual daily rate.
- **August:** mean temperature 26.28 °C is 1.67 °C above the annual mean; the monthly max–min span is 6.47 °C. Relative humidity is 74.04% (0.86 points below annual), while corrected precipitation at 1.43 mm/day is 0.68 mm/day drier than the annual daily rate.
- **September:** mean temperature 26.38 °C is 1.77 °C above the annual mean; the monthly max–min span is 7.02 °C. Relative humidity is 73.50% (1.40 points below annual), while corrected precipitation at 1.68 mm/day is 0.43 mm/day drier than the annual daily rate.
- **October:** mean temperature 25.91 °C is 1.30 °C above the annual mean; the monthly max–min span is 7.61 °C. Relative humidity is 74.98% (0.08 points above annual), while corrected precipitation at 2.37 mm/day is 0.26 mm/day wetter than the annual daily rate.
- **November:** mean temperature 24.86 °C is 0.25 °C above the annual mean; the monthly max–min span is 7.14 °C. Relative humidity is 75.92% (1.02 points above annual), while corrected precipitation at 2.87 mm/day is 0.76 mm/day wetter than the annual daily rate.
- **December:** mean temperature 23.70 °C is 0.91 °C below the annual mean; the monthly max–min span is 8.43 °C. Relative humidity is 76.72% (1.82 points above annual), while corrected precipitation at 2.99 mm/day is 0.88 mm/day wetter than the annual daily rate.

Harth retrieved this point climatology from NASA POWER API v2.9.7 for location record us:honolulu-hi. 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 San Francisco, CA](https://harth.build/resources/climate-data/climate-design-data-workflow-san-francisco-ca.md)
- [Climate Design Data Workflow for Anchorage, AK](https://harth.build/resources/climate-data/climate-design-data-workflow-anchorage-ak.md)
- [Sun Path & Solar Angles for Honolulu, HI](https://harth.build/resources/solar-data/sun-path-and-solar-angles-honolulu-hi.md)

## Sources and method

Licensed ASHRAE Climatic Design Information / Standard 169 station data plus the locally adopted energy code. Coordinates 21.3099° N (Pacific/Honolulu) 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=-157.8583&latitude=21.3099&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=-157.8583&latitude=21.3099&format=JSON)

## Frequently asked questions

### What does NASA POWER climatology show for Honolulu, HI?

For the Honolulu, HI reference point, the 2001–2020 NASA POWER climatology reports 24.6 °C annual mean temperature, 74.9% relative humidity and 2.11 mm/day corrected precipitation. The monthly maximum peaks at 30.6 °C in September.

### Can the Honolulu, HI climatology replace project design temperatures or an hourly weather file?

No. The Honolulu, HI response is gridded monthly climatology; its lowest monthly minimum of 17.9 °C in March 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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