# Climate Design Data Workflow for Denver, CO

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

- Canonical: https://harth.build/resources/climate-data/climate-design-data-workflow-denver-co/
- Last updated: 2026-08-31
- Data source: Licensed ASHRAE Climatic Design Information / Standard 169 station data plus the locally adopted energy code. Coordinates 39.7392° N (America/Denver) 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=-104.9903&latitude=39.7392&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 | 9.1 °C (2 m gridded climatology; not a design percentile) |
| Highest monthly maximum | 37.1 °C (July) (monthly climatological statistic) |
| Lowest monthly minimum | -25.2 °C (February) (monthly climatological statistic) |
| Annual relative humidity | 49.3% (2 m gridded climatology) |
| Annual corrected precipitation | 1.20 mm/day (climatological daily rate) |
| Annual wind speed | 3.83 m/s (10 m gridded climatology; not a structural design wind speed) |

## Direct answer

NASA POWER's 2001–2020 climatology at the Denver, CO reference point reports an annual mean 2 m temperature of 9.1 °C and relative humidity of 49.3%. The highest monthly maximum is 37.1 °C in July, while the lowest monthly minimum is -25.2 °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 1.20 mm/day and annual 10 m wind speed is 3.83 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 |

## Denver, CO 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 | -1.68 | 17.91 | -20.28 | 55.40 | 0.55 | 4.26 |
| February | -1.37 | 18.97 | -25.18 | 55.79 | 0.76 | 4.27 |
| March | 3.17 | 25.18 | -18.21 | 51.53 | 1.10 | 4.24 |
| April | 7.15 | 28.00 | -13.02 | 49.55 | 1.69 | 4.32 |
| May | 12.47 | 33.00 | -8.07 | 48.50 | 1.87 | 3.68 |
| June | 19.45 | 36.94 | 0.57 | 40.84 | 1.41 | 3.61 |
| July | 22.33 | 37.09 | 7.59 | 44.75 | 2.00 | 3.48 |
| August | 20.68 | 36.62 | 5.19 | 45.87 | 1.68 | 3.31 |
| September | 16.36 | 34.33 | -3.87 | 44.25 | 1.19 | 3.44 |
| October | 8.73 | 28.31 | -15.68 | 48.37 | 0.97 | 3.60 |
| November | 2.83 | 23.12 | -17.62 | 50.63 | 0.60 | 3.84 |
| December | -2.06 | 17.50 | -20.75 | 56.14 | 0.60 | 3.98 |

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

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

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

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

## Month-by-month climate interpretation

- **January:** mean temperature -1.68 °C is 10.74 °C below the annual mean; the monthly max–min span is 38.19 °C. Relative humidity is 55.40% (6.11 points above annual), while corrected precipitation at 0.55 mm/day is 0.65 mm/day drier than the annual daily rate.
- **February:** mean temperature -1.37 °C is 10.43 °C below the annual mean; the monthly max–min span is 44.15 °C. Relative humidity is 55.79% (6.50 points above annual), while corrected precipitation at 0.76 mm/day is 0.44 mm/day drier than the annual daily rate.
- **March:** mean temperature 3.17 °C is 5.89 °C below the annual mean; the monthly max–min span is 43.39 °C. Relative humidity is 51.53% (2.24 points above annual), while corrected precipitation at 1.10 mm/day is 0.10 mm/day drier than the annual daily rate.
- **April:** mean temperature 7.15 °C is 1.91 °C below the annual mean; the monthly max–min span is 41.02 °C. Relative humidity is 49.55% (0.26 points above annual), while corrected precipitation at 1.69 mm/day is 0.49 mm/day wetter than the annual daily rate.
- **May:** mean temperature 12.47 °C is 3.41 °C above the annual mean; the monthly max–min span is 41.07 °C. Relative humidity is 48.50% (0.79 points below annual), while corrected precipitation at 1.87 mm/day is 0.67 mm/day wetter than the annual daily rate.
- **June:** mean temperature 19.45 °C is 10.39 °C above the annual mean; the monthly max–min span is 36.37 °C. Relative humidity is 40.84% (8.45 points below annual), while corrected precipitation at 1.41 mm/day is 0.21 mm/day wetter than the annual daily rate.
- **July:** mean temperature 22.33 °C is 13.27 °C above the annual mean; the monthly max–min span is 29.50 °C. Relative humidity is 44.75% (4.54 points below annual), while corrected precipitation at 2.00 mm/day is 0.80 mm/day wetter than the annual daily rate.
- **August:** mean temperature 20.68 °C is 11.62 °C above the annual mean; the monthly max–min span is 31.43 °C. Relative humidity is 45.87% (3.42 points below annual), while corrected precipitation at 1.68 mm/day is 0.48 mm/day wetter than the annual daily rate.
- **September:** mean temperature 16.36 °C is 7.30 °C above the annual mean; the monthly max–min span is 38.20 °C. Relative humidity is 44.25% (5.04 points below annual), while corrected precipitation at 1.19 mm/day is 0.01 mm/day drier than the annual daily rate.
- **October:** mean temperature 8.73 °C is 0.33 °C below the annual mean; the monthly max–min span is 43.99 °C. Relative humidity is 48.37% (0.92 points below annual), while corrected precipitation at 0.97 mm/day is 0.23 mm/day drier than the annual daily rate.
- **November:** mean temperature 2.83 °C is 6.23 °C below the annual mean; the monthly max–min span is 40.74 °C. Relative humidity is 50.63% (1.34 points above annual), while corrected precipitation at 0.60 mm/day is 0.60 mm/day drier than the annual daily rate.
- **December:** mean temperature -2.06 °C is 11.12 °C below the annual mean; the monthly max–min span is 38.25 °C. Relative humidity is 56.14% (6.85 points above annual), while corrected precipitation at 0.60 mm/day is 0.60 mm/day drier than the annual daily rate.

Harth retrieved this point climatology from NASA POWER API v2.9.7 for location record us:denver-co. 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 Albuquerque, NM](https://harth.build/resources/climate-data/climate-design-data-workflow-albuquerque-nm.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)
- [Sun Path & Solar Angles for Denver, CO](https://harth.build/resources/solar-data/sun-path-and-solar-angles-denver-co.md)

## Sources and method

Licensed ASHRAE Climatic Design Information / Standard 169 station data plus the locally adopted energy code. Coordinates 39.7392° N (America/Denver) 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=-104.9903&latitude=39.7392&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=-104.9903&latitude=39.7392&format=JSON)

## Frequently asked questions

### What does NASA POWER climatology show for Denver, CO?

For the Denver, CO reference point, the 2001–2020 NASA POWER climatology reports 9.1 °C annual mean temperature, 49.3% relative humidity and 1.20 mm/day corrected precipitation. The monthly maximum peaks at 37.1 °C in July.

### Can the Denver, CO climatology replace project design temperatures or an hourly weather file?

No. The Denver, CO response is gridded monthly climatology; its lowest monthly minimum of -25.2 °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.

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