Climate Design Data Workflow for Denver, CO

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 · 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.

Denver, CO NASA POWER monthly climate screening table

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
• ASHRAE / IECC Climate Zones Explained (Zones 1–8, A/B/C)
• Heating & Cooling Design Temperatures (99%, 1% / 0.4%)
• Climate Design Data Workflow for Albuquerque, NM
• Climate Design Data Workflow for Salt Lake City, UT
• Sun Path & Solar Angles for Denver, CO

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 and exact point response, 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

• power.larc.nasa.gov