Climate Design Data: Wellington, New Zealand

Direct answer

NASA POWER's 2001–2020 climatology at the Wellington reference point reports an annual mean 2 m temperature of 13.2 °C and relative humidity of 82.3%. The highest monthly maximum is 25.9 °C in January, while the lowest monthly minimum is 3.9 °C in August; 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 2.34 mm/day and annual 10 m wind speed is 6.84 m/s. For climate design data, use the 25.9 °C and 3.9 °C monthly extrema to screen seasonal exposure, then obtain the adopted percentile 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.

Prepared by Harth · Harth transformed the cited NASA POWER climatology into this screening table; project design conditions and local applicability remain unreviewed · Published 2026-08-26 · Updated 2026-08-31.

What must be verified for Wellington?

Wellington is represented here at approximately -41.2866, 174.7756 for discovery and workflow planning. A project address, parcel, elevation, exposure, authority, and submission date must replace that city-centre reference before design use.

How should climate design data be established?

1. Fix the surveyed site and local time basis.
2. Select an authoritative weather source or a named solar-position algorithm.
3. Record period, percentile or scenario and units.
4. Test sensitivity to elevation, exposure, urban form and horizon.
5. Save the source file, retrieval date and checker in the model record.

What are the limits of this worksheet?

This climate-design-workflow page is a project-starting worksheet, not a design value or approval. The controlling authority and qualified professionals for the Wellington site remain authoritative.

Which related searches does this primary location record cover?

This primary route consolidates the location evidence needed for Climate Design Data, Weather File Guide, Overheating Weather Data, Building Climate Checklist. A narrower route should be released only when it adds a materially different official source, calculation, process, threshold or worked example.

Wellington NASA POWER monthly climate screening table

Wellington ranked monthly climate fingerprint

• Wellington mean temperature, highest to lowest: February 16.95 °C, January 16.66 °C, March 15.89 °C, December 15.26 °C, April 14.04 °C, November 13.31 °C, May 12.49 °C, October 11.90 °C, September 10.93 °C, June 10.72 °C, August 10.08 °C, July 9.80 °C.
• Wellington monthly maximum, highest to lowest: January 25.90 °C, February 25.06 °C, December 24.71 °C, March 22.77 °C, November 21.76 °C, April 20.67 °C, October 18.92 °C, May 18.82 °C, September 16.47 °C, June 16.06 °C, July 15.01 °C, August 14.94 °C.
• Wellington monthly minimum, highest to lowest: February 10.64 °C, March 9.86 °C, January 9.59 °C, December 8.35 °C, April 8.31 °C, November 7.15 °C, May 6.10 °C, October 6.10 °C, September 5.71 °C, July 5.22 °C, June 5.21 °C, August 3.86 °C.
• Wellington relative humidity, highest to lowest: August 84.92 %, July 84.37 %, June 84.34 %, May 83.90 %, September 83.47 %, October 82.66 %, April 82.61 %, November 81.43 %, December 81.02 %, March 80.65 %, January 79.11 %, February 79.06 %.
• Wellington corrected precipitation, highest to lowest: June 3.07 mm/day, July 2.77 mm/day, August 2.64 mm/day, May 2.57 mm/day, October 2.49 mm/day, April 2.33 mm/day, September 2.33 mm/day, December 2.21 mm/day, November 2.13 mm/day, February 2.05 mm/day, March 1.87 mm/day, January 1.66 mm/day.
• Wellington 10 m wind speed, highest to lowest: September 7.43 m/s, October 7.29 m/s, November 7.20 m/s, July 6.94 m/s, December 6.88 m/s, June 6.88 m/s, January 6.83 m/s, August 6.73 m/s, May 6.69 m/s, February 6.52 m/s, March 6.37 m/s, April 6.30 m/s.

Wellington month-to-month screening ledger

• Wellington January: mean 16.66 °C, change from December +1.40 °C; max–min span 16.31 °C; humidity 79.11%, change -1.91 points; precipitation 1.66 mm/day; wind 6.83 m/s.
• Wellington February: mean 16.95 °C, change from January +0.29 °C; max–min span 14.42 °C; humidity 79.06%, change -0.05 points; precipitation 2.05 mm/day; wind 6.52 m/s.
• Wellington March: mean 15.89 °C, change from February -1.06 °C; max–min span 12.91 °C; humidity 80.65%, change +1.59 points; precipitation 1.87 mm/day; wind 6.37 m/s.
• Wellington April: mean 14.04 °C, change from March -1.85 °C; max–min span 12.36 °C; humidity 82.61%, change +1.96 points; precipitation 2.33 mm/day; wind 6.30 m/s.
• Wellington May: mean 12.49 °C, change from April -1.55 °C; max–min span 12.72 °C; humidity 83.90%, change +1.29 points; precipitation 2.57 mm/day; wind 6.69 m/s.
• Wellington June: mean 10.72 °C, change from May -1.77 °C; max–min span 10.85 °C; humidity 84.34%, change +0.44 points; precipitation 3.07 mm/day; wind 6.88 m/s.
• Wellington July: mean 9.80 °C, change from June -0.92 °C; max–min span 9.79 °C; humidity 84.37%, change +0.03 points; precipitation 2.77 mm/day; wind 6.94 m/s.
• Wellington August: mean 10.08 °C, change from July +0.28 °C; max–min span 11.08 °C; humidity 84.92%, change +0.55 points; precipitation 2.64 mm/day; wind 6.73 m/s.
• Wellington September: mean 10.93 °C, change from August +0.85 °C; max–min span 10.76 °C; humidity 83.47%, change -1.45 points; precipitation 2.33 mm/day; wind 7.43 m/s.
• Wellington October: mean 11.90 °C, change from September +0.97 °C; max–min span 12.82 °C; humidity 82.66%, change -0.81 points; precipitation 2.49 mm/day; wind 7.29 m/s.
• Wellington November: mean 13.31 °C, change from October +1.41 °C; max–min span 14.61 °C; humidity 81.43%, change -1.23 points; precipitation 2.13 mm/day; wind 7.20 m/s.
• Wellington December: mean 15.26 °C, change from November +1.95 °C; max–min span 16.36 °C; humidity 81.02%, change -0.41 points; precipitation 2.21 mm/day; wind 6.88 m/s.

Harth retrieved this point climatology from NASA POWER API v2.9.7 for location record 2179537. The ranked fingerprint and transition ledger preserve Wellington's monthly order and successive changes for source comparison. This 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
• Climate Design Data: Lower Hutt, New Zealand
• Climate Design Data: Wainuiomata, New Zealand
• Climate Design Data: Upper Hutt, New Zealand
• Climate Design Data: Levin, New Zealand
• All climate & energy design data guidance for New Zealand
• Sun Path: Wellington, New Zealand

Sources and method

Location data from the GeoNames NZ dump (CC BY 4.0, snapshot 2026-08-31, GeoNames ID 2179537). Regulatory starting point: Ministry of Business, Innovation and Employment and the local council. Figures are illustrative — verify against the current locally adopted edition for the site. 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

• download.geonames.org

• building.govt.nz

• power.larc.nasa.gov

• power.larc.nasa.gov