Climate Design Data: Athlone, South Africa

Direct answer

NASA POWER's 2001–2020 climatology at the Athlone reference point reports an annual mean 2 m temperature of 16.5 °C and relative humidity of 74.1%. The highest monthly maximum is 38.7 °C in February, while the lowest monthly minimum is 3.9 °C in July; 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 2.01 mm/day and annual 10 m wind speed is 4.90 m/s. For climate design data, use the 38.7 °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 Athlone?

Athlone is represented here at approximately -33.9672, 18.5021 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 Athlone 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.

Athlone NASA POWER monthly climate screening table

Athlone ranked monthly climate fingerprint

• Athlone mean temperature, highest to lowest: February 21.60 °C, January 21.36 °C, March 20.07 °C, December 19.92 °C, April 17.61 °C, November 17.48 °C, October 15.60 °C, May 15.10 °C, September 13.39 °C, June 12.60 °C, August 11.97 °C, July 11.92 °C.
• Athlone monthly maximum, highest to lowest: February 38.67 °C, March 37.81 °C, January 36.64 °C, December 36.25 °C, April 36.18 °C, November 33.19 °C, October 32.71 °C, September 29.75 °C, May 29.00 °C, June 26.32 °C, August 26.04 °C, July 24.39 °C.
• Athlone monthly minimum, highest to lowest: February 11.55 °C, January 11.40 °C, March 10.42 °C, December 10.20 °C, November 8.35 °C, April 8.23 °C, May 6.10 °C, October 5.57 °C, September 5.48 °C, June 4.87 °C, August 4.33 °C, July 3.88 °C.
• Athlone relative humidity, highest to lowest: August 82.65 %, July 81.83 %, September 80.83 %, June 80.27 %, October 76.60 %, May 76.56 %, November 71.54 %, April 70.79 %, March 68.18 %, December 67.35 %, February 66.09 %, January 65.81 %.
• Athlone corrected precipitation, highest to lowest: June 4.49 mm/day, July 3.99 mm/day, August 3.89 mm/day, May 2.30 mm/day, September 2.06 mm/day, April 1.61 mm/day, November 1.52 mm/day, October 1.50 mm/day, March 0.81 mm/day, December 0.66 mm/day, January 0.65 mm/day, February 0.53 mm/day.
• Athlone 10 m wind speed, highest to lowest: January 5.78 m/s, December 5.53 m/s, February 5.46 m/s, November 5.37 m/s, October 4.94 m/s, March 4.92 m/s, September 4.60 m/s, August 4.58 m/s, April 4.51 m/s, June 4.46 m/s, July 4.35 m/s, May 4.31 m/s.

Athlone month-to-month screening ledger

• Athlone January: mean 21.36 °C, change from December +1.44 °C; max–min span 25.24 °C; humidity 65.81%, change -1.54 points; precipitation 0.65 mm/day; wind 5.78 m/s.
• Athlone February: mean 21.60 °C, change from January +0.24 °C; max–min span 27.12 °C; humidity 66.09%, change +0.28 points; precipitation 0.53 mm/day; wind 5.46 m/s.
• Athlone March: mean 20.07 °C, change from February -1.53 °C; max–min span 27.39 °C; humidity 68.18%, change +2.09 points; precipitation 0.81 mm/day; wind 4.92 m/s.
• Athlone April: mean 17.61 °C, change from March -2.46 °C; max–min span 27.95 °C; humidity 70.79%, change +2.61 points; precipitation 1.61 mm/day; wind 4.51 m/s.
• Athlone May: mean 15.10 °C, change from April -2.51 °C; max–min span 22.90 °C; humidity 76.56%, change +5.77 points; precipitation 2.30 mm/day; wind 4.31 m/s.
• Athlone June: mean 12.60 °C, change from May -2.50 °C; max–min span 21.45 °C; humidity 80.27%, change +3.71 points; precipitation 4.49 mm/day; wind 4.46 m/s.
• Athlone July: mean 11.92 °C, change from June -0.68 °C; max–min span 20.51 °C; humidity 81.83%, change +1.56 points; precipitation 3.99 mm/day; wind 4.35 m/s.
• Athlone August: mean 11.97 °C, change from July +0.05 °C; max–min span 21.71 °C; humidity 82.65%, change +0.82 points; precipitation 3.89 mm/day; wind 4.58 m/s.
• Athlone September: mean 13.39 °C, change from August +1.42 °C; max–min span 24.27 °C; humidity 80.83%, change -1.82 points; precipitation 2.06 mm/day; wind 4.60 m/s.
• Athlone October: mean 15.60 °C, change from September +2.21 °C; max–min span 27.14 °C; humidity 76.60%, change -4.23 points; precipitation 1.50 mm/day; wind 4.94 m/s.
• Athlone November: mean 17.48 °C, change from October +1.88 °C; max–min span 24.84 °C; humidity 71.54%, change -5.06 points; precipitation 1.52 mm/day; wind 5.37 m/s.
• Athlone December: mean 19.92 °C, change from November +2.44 °C; max–min span 26.05 °C; humidity 67.35%, change -4.19 points; precipitation 0.66 mm/day; wind 5.53 m/s.

Harth retrieved this point climatology from NASA POWER API v2.9.7 for location record 3370356. The ranked fingerprint and transition ledger preserve Athlone'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: Cape Town, South Africa
• Climate Design Data: Somerset West, South Africa
• Climate Design Data: Paarl, South Africa
• Climate Design Data: George, South Africa
• All climate & energy design data guidance for South Africa
• Sun Path: Athlone, South Africa

Sources and method

Location data from the GeoNames ZA dump (CC BY 4.0, snapshot 2026-08-31, GeoNames ID 3370356). Regulatory starting point: South African Bureau of Standards and the local 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

• sabs.co.za

• power.larc.nasa.gov

• power.larc.nasa.gov