Climate Design Data: Iseyin, Nigeria

Direct answer

NASA POWER's 2001–2020 climatology at the Iseyin reference point reports an annual mean 2 m temperature of 25.1 °C and relative humidity of 82.0%. The highest monthly maximum is 39.1 °C in April, while the lowest monthly minimum is 11.3 °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 4.15 mm/day and annual 10 m wind speed is 2.61 m/s. For climate design data, use the 39.1 °C and 11.3 °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 Iseyin?

Iseyin is represented here at approximately 7.9702, 3.5963 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 Iseyin 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.

Iseyin NASA POWER monthly climate screening table

Iseyin ranked monthly climate fingerprint

• Iseyin mean temperature, highest to lowest: March 26.60 °C, April 26.30 °C, February 26.00 °C, May 25.77 °C, November 25.16 °C, October 24.99 °C, June 24.90 °C, September 24.46 °C, December 24.30 °C, July 24.26 °C, January 24.13 °C, August 23.97 °C.
• Iseyin monthly maximum, highest to lowest: April 39.07 °C, March 39.06 °C, February 37.83 °C, January 35.15 °C, December 34.71 °C, May 34.23 °C, November 33.42 °C, June 32.25 °C, October 32.19 °C, July 32.04 °C, September 30.72 °C, August 30.20 °C.
• Iseyin monthly minimum, highest to lowest: May 20.82 °C, April 19.94 °C, June 19.77 °C, October 19.39 °C, July 19.16 °C, September 19.16 °C, August 17.46 °C, March 16.82 °C, November 14.83 °C, February 14.19 °C, December 13.45 °C, January 11.32 °C.
• Iseyin relative humidity, highest to lowest: September 89.10 %, August 88.94 %, July 88.90 %, June 88.64 %, October 88.00 %, May 87.25 %, April 84.54 %, November 80.65 %, March 79.63 %, February 72.68 %, December 69.73 %, January 66.16 %.
• Iseyin corrected precipitation, highest to lowest: September 9.79 mm/day, June 7.19 mm/day, July 6.59 mm/day, August 6.17 mm/day, October 6.14 mm/day, May 5.25 mm/day, April 3.88 mm/day, March 1.90 mm/day, November 1.14 mm/day, February 0.70 mm/day, January 0.52 mm/day, December 0.44 mm/day.
• Iseyin 10 m wind speed, highest to lowest: August 3.26 m/s, July 3.12 m/s, April 2.96 m/s, March 2.85 m/s, June 2.82 m/s, May 2.71 m/s, February 2.61 m/s, January 2.55 m/s, September 2.45 m/s, December 2.15 m/s, October 2.01 m/s, November 1.82 m/s.

Iseyin month-to-month screening ledger

• Iseyin January: mean 24.13 °C, change from December -0.17 °C; max–min span 23.83 °C; humidity 66.16%, change -3.57 points; precipitation 0.52 mm/day; wind 2.55 m/s.
• Iseyin February: mean 26.00 °C, change from January +1.87 °C; max–min span 23.64 °C; humidity 72.68%, change +6.52 points; precipitation 0.70 mm/day; wind 2.61 m/s.
• Iseyin March: mean 26.60 °C, change from February +0.60 °C; max–min span 22.24 °C; humidity 79.63%, change +6.95 points; precipitation 1.90 mm/day; wind 2.85 m/s.
• Iseyin April: mean 26.30 °C, change from March -0.30 °C; max–min span 19.13 °C; humidity 84.54%, change +4.91 points; precipitation 3.88 mm/day; wind 2.96 m/s.
• Iseyin May: mean 25.77 °C, change from April -0.53 °C; max–min span 13.41 °C; humidity 87.25%, change +2.71 points; precipitation 5.25 mm/day; wind 2.71 m/s.
• Iseyin June: mean 24.90 °C, change from May -0.87 °C; max–min span 12.48 °C; humidity 88.64%, change +1.39 points; precipitation 7.19 mm/day; wind 2.82 m/s.
• Iseyin July: mean 24.26 °C, change from June -0.64 °C; max–min span 12.88 °C; humidity 88.90%, change +0.26 points; precipitation 6.59 mm/day; wind 3.12 m/s.
• Iseyin August: mean 23.97 °C, change from July -0.29 °C; max–min span 12.74 °C; humidity 88.94%, change +0.04 points; precipitation 6.17 mm/day; wind 3.26 m/s.
• Iseyin September: mean 24.46 °C, change from August +0.49 °C; max–min span 11.56 °C; humidity 89.10%, change +0.16 points; precipitation 9.79 mm/day; wind 2.45 m/s.
• Iseyin October: mean 24.99 °C, change from September +0.53 °C; max–min span 12.80 °C; humidity 88.00%, change -1.10 points; precipitation 6.14 mm/day; wind 2.01 m/s.
• Iseyin November: mean 25.16 °C, change from October +0.17 °C; max–min span 18.59 °C; humidity 80.65%, change -7.35 points; precipitation 1.14 mm/day; wind 1.82 m/s.
• Iseyin December: mean 24.30 °C, change from November -0.86 °C; max–min span 21.26 °C; humidity 69.73%, change -10.92 points; precipitation 0.44 mm/day; wind 2.15 m/s.

Harth retrieved this point climatology from NASA POWER API v2.9.7 for location record 2337181. The ranked fingerprint and transition ledger preserve Iseyin'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
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• Climate Design Data: Ibadan, Nigeria
• Climate Design Data: Abeokuta, Nigeria
• All climate & energy design data guidance for Nigeria
• Sun Path: Iseyin, Nigeria

Sources and method

Location data from the GeoNames NG dump (CC BY 4.0, snapshot 2026-08-31, GeoNames ID 2337181). Regulatory starting point: Federal Ministry of Housing and Urban Development and the applicable state authority. 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

• fmhud.gov.ng

• power.larc.nasa.gov

• power.larc.nasa.gov