Climate Design Data: Toronto, Canada

Direct answer

NASA POWER's 2001–2020 climatology at the Toronto reference point reports an annual mean 2 m temperature of 9.1 °C and relative humidity of 78.7%. The highest monthly maximum is 32.2 °C in July, while the lowest monthly minimum is -22.6 °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 2.12 mm/day and annual 10 m wind speed is 5.36 m/s. For climate design data, use the 32.2 °C and -22.6 °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.

Content and cited inputs reviewed by Harth team · Published 2026-08-26 · Updated 2026-08-31.

What are the key takeaways?

• NASA POWER climatology: 20-year Meteorological and Solar Monthly & Annual Climatologies (January 2001 - December 2020)
• Annual mean temperature: 9.1 °C
• Highest monthly maximum: 32.2 °C (July)
• Lowest monthly minimum: -22.6 °C (February)

What must be verified for Toronto?

Toronto is represented here at approximately 43.7064, -79.3986 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 Toronto 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.

Toronto NASA POWER monthly climate screening table

Toronto ranked monthly climate fingerprint

• Toronto mean temperature, highest to lowest: July 21.66 °C, August 21.58 °C, September 18.25 °C, June 17.61 °C, October 11.49 °C, May 11.29 °C, April 5.52 °C, November 5.36 °C, March 0.70 °C, December 0.47 °C, January -2.69 °C, February -2.76 °C.
• Toronto monthly maximum, highest to lowest: July 32.22 °C, August 31.89 °C, September 30.89 °C, June 30.41 °C, May 28.46 °C, October 25.27 °C, March 19.86 °C, April 18.87 °C, November 18.27 °C, December 13.03 °C, January 11.37 °C, February 11.04 °C.
• Toronto monthly minimum, highest to lowest: August 11.24 °C, July 7.98 °C, September 4.75 °C, June 4.45 °C, May -0.45 °C, October -0.99 °C, November -7.11 °C, April -9.83 °C, December -14.05 °C, January -19.17 °C, March -21.39 °C, February -22.56 °C.
• Toronto relative humidity, highest to lowest: January 85.54 %, February 84.06 %, December 83.85 %, November 80.74 %, March 80.55 %, April 79.05 %, May 78.30 %, October 77.91 %, June 75.52 %, September 74.03 %, August 72.44 %, July 72.13 %.
• Toronto corrected precipitation, highest to lowest: July 2.42 mm/day, October 2.39 mm/day, April 2.38 mm/day, June 2.37 mm/day, May 2.34 mm/day, November 2.21 mm/day, September 2.19 mm/day, December 2.02 mm/day, August 1.90 mm/day, February 1.74 mm/day, January 1.74 mm/day, March 1.71 mm/day.
• Toronto 10 m wind speed, highest to lowest: January 6.96 m/s, February 6.78 m/s, December 6.61 m/s, November 6.01 m/s, March 5.83 m/s, October 5.71 m/s, April 5.36 m/s, September 4.67 m/s, May 4.27 m/s, August 4.12 m/s, June 4.08 m/s, July 3.96 m/s.

Toronto month-to-month screening ledger

• Toronto January: mean -2.69 °C, change from December -3.16 °C; max–min span 30.54 °C; humidity 85.54%, change +1.69 points; precipitation 1.74 mm/day; wind 6.96 m/s.
• Toronto February: mean -2.76 °C, change from January -0.07 °C; max–min span 33.60 °C; humidity 84.06%, change -1.48 points; precipitation 1.74 mm/day; wind 6.78 m/s.
• Toronto March: mean 0.70 °C, change from February +3.46 °C; max–min span 41.25 °C; humidity 80.55%, change -3.51 points; precipitation 1.71 mm/day; wind 5.83 m/s.
• Toronto April: mean 5.52 °C, change from March +4.82 °C; max–min span 28.70 °C; humidity 79.05%, change -1.50 points; precipitation 2.38 mm/day; wind 5.36 m/s.
• Toronto May: mean 11.29 °C, change from April +5.77 °C; max–min span 28.91 °C; humidity 78.30%, change -0.75 points; precipitation 2.34 mm/day; wind 4.27 m/s.
• Toronto June: mean 17.61 °C, change from May +6.32 °C; max–min span 25.96 °C; humidity 75.52%, change -2.78 points; precipitation 2.37 mm/day; wind 4.08 m/s.
• Toronto July: mean 21.66 °C, change from June +4.05 °C; max–min span 24.24 °C; humidity 72.13%, change -3.39 points; precipitation 2.42 mm/day; wind 3.96 m/s.
• Toronto August: mean 21.58 °C, change from July -0.08 °C; max–min span 20.65 °C; humidity 72.44%, change +0.31 points; precipitation 1.90 mm/day; wind 4.12 m/s.
• Toronto September: mean 18.25 °C, change from August -3.33 °C; max–min span 26.14 °C; humidity 74.03%, change +1.59 points; precipitation 2.19 mm/day; wind 4.67 m/s.
• Toronto October: mean 11.49 °C, change from September -6.76 °C; max–min span 26.26 °C; humidity 77.91%, change +3.88 points; precipitation 2.39 mm/day; wind 5.71 m/s.
• Toronto November: mean 5.36 °C, change from October -6.13 °C; max–min span 25.38 °C; humidity 80.74%, change +2.83 points; precipitation 2.21 mm/day; wind 6.01 m/s.
• Toronto December: mean 0.47 °C, change from November -4.89 °C; max–min span 27.08 °C; humidity 83.85%, change +3.11 points; precipitation 2.02 mm/day; wind 6.61 m/s.

Harth retrieved this point climatology from NASA POWER API v2.9.7 for location record 6167865. The ranked fingerprint and transition ledger preserve Toronto'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: Oshawa, Canada
• Climate Design Data: Hamilton, Canada
• Climate Design Data: Barrie, Canada
• Climate Design Data: Kitchener, Canada
• All climate & energy design data guidance for Canada
• House Construction Cost Planning: Toronto, Canada
• Office Construction Cost Planning: Toronto, Canada
• Retail Construction Cost Planning: Toronto, Canada
• School Construction Cost Planning: Toronto, Canada

Sources and method

Location data from the GeoNames CA dump (CC BY 4.0, snapshot 2026-08-31, GeoNames ID 6167865). 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