Climate Design Data: Athi River, Kenya

Direct answer

NASA POWER's 2001–2020 climatology at the Athi River reference point reports an annual mean 2 m temperature of 20.1 °C and relative humidity of 66.3%. The highest monthly maximum is 35.6 °C in February, while the lowest monthly minimum is 8.7 °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 1.65 mm/day and annual 10 m wind speed is 4.25 m/s. For climate design data, use the 35.6 °C and 8.7 °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 Athi River?

Athi River is represented here at approximately -1.4563, 36.9783 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 Athi River 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.

Athi River NASA POWER monthly climate screening table

Month-by-month climate interpretation

• January: mean temperature 20.51 °C is 0.41 °C above the annual mean; the monthly max–min span is 24.03 °C. Relative humidity is 63.30% (2.98 points below annual), while corrected precipitation at 1.27 mm/day is 0.38 mm/day drier than the annual daily rate.
• February: mean temperature 21.42 °C is 1.32 °C above the annual mean; the monthly max–min span is 24.62 °C. Relative humidity is 58.94% (7.34 points below annual), while corrected precipitation at 1.03 mm/day is 0.62 mm/day drier than the annual daily rate.
• March: mean temperature 21.62 °C is 1.52 °C above the annual mean; the monthly max–min span is 23.11 °C. Relative humidity is 62.85% (3.43 points below annual), while corrected precipitation at 2.07 mm/day is 0.42 mm/day wetter than the annual daily rate.
• April: mean temperature 20.54 °C is 0.44 °C above the annual mean; the monthly max–min span is 20.98 °C. Relative humidity is 72.75% (6.47 points above annual), while corrected precipitation at 3.80 mm/day is 2.15 mm/day wetter than the annual daily rate.
• May: mean temperature 19.32 °C is 0.78 °C below the annual mean; the monthly max–min span is 19.55 °C. Relative humidity is 75.02% (8.74 points above annual), while corrected precipitation at 2.34 mm/day is 0.69 mm/day wetter than the annual daily rate.
• June: mean temperature 18.72 °C is 1.38 °C below the annual mean; the monthly max–min span is 21.38 °C. Relative humidity is 70.32% (4.04 points above annual), while corrected precipitation at 0.84 mm/day is 0.81 mm/day drier than the annual daily rate.
• July: mean temperature 18.69 °C is 1.41 °C below the annual mean; the monthly max–min span is 21.16 °C. Relative humidity is 64.06% (2.22 points below annual), while corrected precipitation at 0.53 mm/day is 1.12 mm/day drier than the annual daily rate.
• August: mean temperature 19.20 °C is 0.90 °C below the annual mean; the monthly max–min span is 21.81 °C. Relative humidity is 62.65% (3.63 points below annual), while corrected precipitation at 0.70 mm/day is 0.95 mm/day drier than the annual daily rate.
• September: mean temperature 20.34 °C is 0.24 °C above the annual mean; the monthly max–min span is 22.93 °C. Relative humidity is 59.11% (7.17 points below annual), while corrected precipitation at 0.68 mm/day is 0.97 mm/day drier than the annual daily rate.
• October: mean temperature 20.84 °C is 0.74 °C above the annual mean; the monthly max–min span is 20.76 °C. Relative humidity is 62.21% (4.07 points below annual), while corrected precipitation at 1.72 mm/day is 0.07 mm/day wetter than the annual daily rate.
• November: mean temperature 20.17 °C is 0.07 °C above the annual mean; the monthly max–min span is 18.66 °C. Relative humidity is 72.51% (6.23 points above annual), while corrected precipitation at 2.69 mm/day is 1.04 mm/day wetter than the annual daily rate.
• December: mean temperature 19.97 °C is 0.13 °C below the annual mean; the monthly max–min span is 20.33 °C. Relative humidity is 71.32% (5.04 points above annual), while corrected precipitation at 2.10 mm/day is 0.45 mm/day wetter than the annual daily rate.

Harth retrieved this point climatology from NASA POWER API v2.9.7 for location record 200787. 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
• Climate Design Data: Juja, Kenya
• Climate Design Data: Mwala, Kenya
• Climate Design Data: Naivasha, Kenya
• Climate Design Data: Embu, Kenya

Sources and method

Location data from the GeoNames KE dump (CC BY 4.0, snapshot 2026-08-31, GeoNames ID 200787). Regulatory starting point: National Construction Authority and the applicable county government. 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

• nca.go.ke

• power.larc.nasa.gov

• power.larc.nasa.gov