Climate Design Data: Guelph, Canada

Direct answer

NASA POWER's 2001–2020 climatology at the Guelph reference point reports an annual mean 2 m temperature of 8.1 °C and relative humidity of 78.3%. The highest monthly maximum is 38.3 °C in August, while the lowest monthly minimum is -31.4 °C in February; 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 4.75 m/s. For climate design data, use the 38.3 °C and -31.4 °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 Guelph?

Guelph is represented here at approximately 43.5459, -80.2560 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 Guelph 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.

Guelph NASA POWER monthly climate screening table

Guelph ranked monthly climate fingerprint

• Guelph mean temperature, highest to lowest: July 22.32 °C, August 21.46 °C, June 18.78 °C, September 17.44 °C, May 12.85 °C, October 9.73 °C, April 5.72 °C, November 3.11 °C, March -0.73 °C, December -2.66 °C, February -5.96 °C, January -6.16 °C.
• Guelph monthly maximum, highest to lowest: August 38.32 °C, July 36.97 °C, June 35.97 °C, September 35.46 °C, May 32.95 °C, October 30.17 °C, March 25.89 °C, April 25.32 °C, November 22.48 °C, December 16.46 °C, February 15.65 °C, January 13.19 °C.
• Guelph monthly minimum, highest to lowest: August 8.19 °C, July 6.78 °C, June 3.40 °C, September 2.78 °C, May -3.99 °C, October -4.95 °C, November -14.19 °C, April -18.00 °C, December -24.29 °C, March -26.24 °C, January -27.69 °C, February -31.40 °C.
• Guelph relative humidity, highest to lowest: January 89.57 %, December 88.85 %, February 88.84 %, November 84.12 %, March 82.98 %, October 78.71 %, April 78.01 %, May 74.67 %, September 70.93 %, June 70.78 %, August 67.06 %, July 65.57 %.
• Guelph corrected precipitation, highest to lowest: July 2.50 mm/day, June 2.43 mm/day, October 2.40 mm/day, May 2.38 mm/day, April 2.32 mm/day, September 2.32 mm/day, November 2.09 mm/day, August 2.03 mm/day, December 1.79 mm/day, February 1.70 mm/day, March 1.68 mm/day, January 1.64 mm/day.
• Guelph 10 m wind speed, highest to lowest: February 5.87 m/s, January 5.77 m/s, March 5.42 m/s, December 5.30 m/s, April 5.23 m/s, November 4.95 m/s, October 4.72 m/s, May 4.33 m/s, June 4.01 m/s, September 3.99 m/s, July 3.75 m/s, August 3.69 m/s.

Guelph month-to-month screening ledger

• Guelph January: mean -6.16 °C, change from December -3.50 °C; max–min span 40.88 °C; humidity 89.57%, change +0.72 points; precipitation 1.64 mm/day; wind 5.77 m/s.
• Guelph February: mean -5.96 °C, change from January +0.20 °C; max–min span 47.05 °C; humidity 88.84%, change -0.73 points; precipitation 1.70 mm/day; wind 5.87 m/s.
• Guelph March: mean -0.73 °C, change from February +5.23 °C; max–min span 52.13 °C; humidity 82.98%, change -5.86 points; precipitation 1.68 mm/day; wind 5.42 m/s.
• Guelph April: mean 5.72 °C, change from March +6.45 °C; max–min span 43.32 °C; humidity 78.01%, change -4.97 points; precipitation 2.32 mm/day; wind 5.23 m/s.
• Guelph May: mean 12.85 °C, change from April +7.13 °C; max–min span 36.94 °C; humidity 74.67%, change -3.34 points; precipitation 2.38 mm/day; wind 4.33 m/s.
• Guelph June: mean 18.78 °C, change from May +5.93 °C; max–min span 32.57 °C; humidity 70.78%, change -3.89 points; precipitation 2.43 mm/day; wind 4.01 m/s.
• Guelph July: mean 22.32 °C, change from June +3.54 °C; max–min span 30.19 °C; humidity 65.57%, change -5.21 points; precipitation 2.50 mm/day; wind 3.75 m/s.
• Guelph August: mean 21.46 °C, change from July -0.86 °C; max–min span 30.13 °C; humidity 67.06%, change +1.49 points; precipitation 2.03 mm/day; wind 3.69 m/s.
• Guelph September: mean 17.44 °C, change from August -4.02 °C; max–min span 32.68 °C; humidity 70.93%, change +3.87 points; precipitation 2.32 mm/day; wind 3.99 m/s.
• Guelph October: mean 9.73 °C, change from September -7.71 °C; max–min span 35.12 °C; humidity 78.71%, change +7.78 points; precipitation 2.40 mm/day; wind 4.72 m/s.
• Guelph November: mean 3.11 °C, change from October -6.62 °C; max–min span 36.67 °C; humidity 84.12%, change +5.41 points; precipitation 2.09 mm/day; wind 4.95 m/s.
• Guelph December: mean -2.66 °C, change from November -5.77 °C; max–min span 40.75 °C; humidity 88.85%, change +4.73 points; precipitation 1.79 mm/day; wind 5.30 m/s.

Harth retrieved this point climatology from NASA POWER API v2.9.7 for location record 5967629. The ranked fingerprint and transition ledger preserve Guelph'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: Kitchener, Canada
• Climate Design Data: Burlington, Canada
• Climate Design Data: Mississauga, Canada
• Climate Design Data: Etobicoke, Canada
• All climate & energy design data guidance for Canada
• Daylight & Orientation: Guelph, Canada
• Solar Altitude & Azimuth: Guelph, Canada
• Solar Shading Design: Guelph, Canada
• Sun Path: Guelph, Canada

Sources and method

Location data from the GeoNames CA dump (CC BY 4.0, snapshot 2026-08-31, GeoNames ID 5967629). Regulatory starting point: Codes Canada and the applicable provincial or territorial 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

• nrc.canada.ca

• power.larc.nasa.gov

• power.larc.nasa.gov