Climate Design Data Workflow for Honolulu, HI

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 · 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.

Honolulu, HI NASA POWER monthly climate screening table

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
• ASHRAE / IECC Climate Zones Explained (Zones 1–8, A/B/C)
• Heating & Cooling Design Temperatures (99%, 1% / 0.4%)
• Climate Design Data Workflow for San Francisco, CA
• Climate Design Data Workflow for Anchorage, AK
• Sun Path & Solar Angles for Honolulu, HI

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 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