# Climate Design Data Workflow for Boise, ID

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

- Canonical: https://harth.build/resources/climate-data/climate-design-data-workflow-boise-id/
- Last updated: 2026-08-31
- Data source: Licensed ASHRAE Climatic Design Information / Standard 169 station data plus the locally adopted energy code. Coordinates 43.6150° N (America/Boise) 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=-116.2023&latitude=43.615&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 | 10.7 °C (2 m gridded climatology; not a design percentile) |
| Highest monthly maximum | 43.4 °C (July) (monthly climatological statistic) |
| Lowest monthly minimum | -22.7 °C (January) (monthly climatological statistic) |
| Annual relative humidity | 55.0% (2 m gridded climatology) |
| Annual corrected precipitation | 1.06 mm/day (climatological daily rate) |
| Annual wind speed | 3.26 m/s (10 m gridded climatology; not a structural design wind speed) |

## Direct answer

NASA POWER's 2001–2020 climatology at the Boise, ID reference point reports an annual mean 2 m temperature of 10.7 °C and relative humidity of 55.0%. The highest monthly maximum is 43.4 °C in July, while the lowest monthly minimum is -22.7 °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 1.06 mm/day and annual 10 m wind speed is 3.26 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 |

## Boise, ID 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 | -1.71 | 13.90 | -22.73 | 81.26 | 1.65 | 3.13 |
| February | 0.72 | 15.73 | -13.05 | 73.38 | 1.26 | 3.40 |
| March | 5.04 | 23.38 | -9.00 | 65.36 | 1.52 | 3.54 |
| April | 8.65 | 30.33 | -4.94 | 58.45 | 1.17 | 3.61 |
| May | 14.29 | 37.70 | -3.01 | 51.72 | 1.21 | 3.34 |
| June | 19.37 | 42.23 | 2.00 | 44.22 | 0.76 | 3.35 |
| July | 25.68 | 43.42 | 8.04 | 31.85 | 0.21 | 3.14 |
| August | 24.52 | 42.02 | 7.01 | 28.81 | 0.23 | 3.02 |
| September | 18.78 | 38.46 | 0.93 | 34.24 | 0.46 | 2.98 |
| October | 10.58 | 33.52 | -7.76 | 48.88 | 0.87 | 3.12 |
| November | 3.44 | 22.87 | -14.57 | 64.34 | 1.34 | 3.27 |
| December | -1.60 | 14.63 | -20.76 | 78.37 | 2.11 | 3.32 |

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

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

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

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

## Month-by-month climate interpretation

- **January:** mean temperature -1.71 °C is 12.41 °C below the annual mean; the monthly max–min span is 36.63 °C. Relative humidity is 81.26% (26.27 points above annual), while corrected precipitation at 1.65 mm/day is 0.59 mm/day wetter than the annual daily rate.
- **February:** mean temperature 0.72 °C is 9.98 °C below the annual mean; the monthly max–min span is 28.78 °C. Relative humidity is 73.38% (18.39 points above annual), while corrected precipitation at 1.26 mm/day is 0.20 mm/day wetter than the annual daily rate.
- **March:** mean temperature 5.04 °C is 5.66 °C below the annual mean; the monthly max–min span is 32.38 °C. Relative humidity is 65.36% (10.37 points above annual), while corrected precipitation at 1.52 mm/day is 0.46 mm/day wetter than the annual daily rate.
- **April:** mean temperature 8.65 °C is 2.05 °C below the annual mean; the monthly max–min span is 35.27 °C. Relative humidity is 58.45% (3.46 points above annual), while corrected precipitation at 1.17 mm/day is 0.11 mm/day wetter than the annual daily rate.
- **May:** mean temperature 14.29 °C is 3.59 °C above the annual mean; the monthly max–min span is 40.71 °C. Relative humidity is 51.72% (3.27 points below annual), while corrected precipitation at 1.21 mm/day is 0.15 mm/day wetter than the annual daily rate.
- **June:** mean temperature 19.37 °C is 8.67 °C above the annual mean; the monthly max–min span is 40.23 °C. Relative humidity is 44.22% (10.77 points below annual), while corrected precipitation at 0.76 mm/day is 0.30 mm/day drier than the annual daily rate.
- **July:** mean temperature 25.68 °C is 14.98 °C above the annual mean; the monthly max–min span is 35.38 °C. Relative humidity is 31.85% (23.14 points below annual), while corrected precipitation at 0.21 mm/day is 0.85 mm/day drier than the annual daily rate.
- **August:** mean temperature 24.52 °C is 13.82 °C above the annual mean; the monthly max–min span is 35.01 °C. Relative humidity is 28.81% (26.18 points below annual), while corrected precipitation at 0.23 mm/day is 0.83 mm/day drier than the annual daily rate.
- **September:** mean temperature 18.78 °C is 8.08 °C above the annual mean; the monthly max–min span is 37.53 °C. Relative humidity is 34.24% (20.75 points below annual), while corrected precipitation at 0.46 mm/day is 0.60 mm/day drier than the annual daily rate.
- **October:** mean temperature 10.58 °C is 0.12 °C below the annual mean; the monthly max–min span is 41.28 °C. Relative humidity is 48.88% (6.11 points below annual), while corrected precipitation at 0.87 mm/day is 0.19 mm/day drier than the annual daily rate.
- **November:** mean temperature 3.44 °C is 7.26 °C below the annual mean; the monthly max–min span is 37.44 °C. Relative humidity is 64.34% (9.35 points above annual), while corrected precipitation at 1.34 mm/day is 0.28 mm/day wetter than the annual daily rate.
- **December:** mean temperature -1.60 °C is 12.30 °C below the annual mean; the monthly max–min span is 35.39 °C. Relative humidity is 78.37% (23.38 points above annual), while corrected precipitation at 2.11 mm/day is 1.05 mm/day wetter than the annual daily rate.

Harth retrieved this point climatology from NASA POWER API v2.9.7 for location record us:boise-id. 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 Salt Lake City, UT](https://harth.build/resources/climate-data/climate-design-data-workflow-salt-lake-city-ut.md)
- [Climate Design Data Workflow for Portland, OR](https://harth.build/resources/climate-data/climate-design-data-workflow-portland-or.md)
- [Sun Path & Solar Angles for Boise, ID](https://harth.build/resources/solar-data/sun-path-and-solar-angles-boise-id.md)

## Sources and method

Licensed ASHRAE Climatic Design Information / Standard 169 station data plus the locally adopted energy code. Coordinates 43.6150° N (America/Boise) 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=-116.2023&latitude=43.615&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=-116.2023&latitude=43.615&format=JSON)

## Frequently asked questions

### What does NASA POWER climatology show for Boise, ID?

For the Boise, ID reference point, the 2001–2020 NASA POWER climatology reports 10.7 °C annual mean temperature, 55.0% relative humidity and 1.06 mm/day corrected precipitation. The monthly maximum peaks at 43.4 °C in July.

### Can the Boise, ID climatology replace project design temperatures or an hourly weather file?

No. The Boise, ID response is gridded monthly climatology; its lowest monthly minimum of -22.7 °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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