Climate Design Data: Ottawa, Canada

Direct answer

NASA POWER's 2001–2020 climatology at the Ottawa reference point reports an annual mean 2 m temperature of 5.8 °C and relative humidity of 83.4%. The highest monthly maximum is 36.0 °C in July, while the lowest monthly minimum is -39.9 °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 2.69 mm/day and annual 10 m wind speed is 2.41 m/s. For climate design data, use the 36.0 °C and -39.9 °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 Ottawa?

Ottawa is represented here at approximately 45.4112, -75.6981 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 Ottawa 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.

Ottawa NASA POWER monthly climate screening table

Ottawa ranked monthly climate fingerprint

• Ottawa mean temperature, highest to lowest: July 20.57 °C, August 19.69 °C, June 17.78 °C, September 15.68 °C, May 12.61 °C, October 8.14 °C, April 4.97 °C, November 1.04 °C, March -3.68 °C, December -6.80 °C, February -10.13 °C, January -11.34 °C.
• Ottawa monthly maximum, highest to lowest: July 35.99 °C, August 34.27 °C, June 33.35 °C, September 33.29 °C, May 30.84 °C, October 27.03 °C, April 26.82 °C, March 25.27 °C, November 19.98 °C, December 16.63 °C, January 11.23 °C, February 10.48 °C.
• Ottawa monthly minimum, highest to lowest: July 7.71 °C, August 6.46 °C, June 0.95 °C, September -1.13 °C, May -4.38 °C, October -5.85 °C, April -14.09 °C, November -19.04 °C, March -31.30 °C, December -35.25 °C, February -37.73 °C, January -39.91 °C.
• Ottawa relative humidity, highest to lowest: January 94.92 %, February 94.35 %, December 92.24 %, March 87.07 %, November 85.07 %, October 80.93 %, July 78.84 %, June 78.53 %, April 77.78 %, August 77.67 %, September 77.58 %, May 76.80 %.
• Ottawa corrected precipitation, highest to lowest: June 3.46 mm/day, October 3.20 mm/day, July 3.17 mm/day, September 2.91 mm/day, April 2.84 mm/day, August 2.84 mm/day, May 2.75 mm/day, December 2.59 mm/day, November 2.44 mm/day, March 2.08 mm/day, January 1.98 mm/day, February 1.96 mm/day.
• Ottawa 10 m wind speed, highest to lowest: February 3.43 m/s, March 3.23 m/s, January 3.06 m/s, April 2.80 m/s, December 2.59 m/s, November 2.35 m/s, October 2.17 m/s, May 2.15 m/s, September 1.88 m/s, June 1.85 m/s, August 1.73 m/s, July 1.72 m/s.

Ottawa month-to-month screening ledger

• Ottawa January: mean -11.34 °C, change from December -4.54 °C; max–min span 51.14 °C; humidity 94.92%, change +2.68 points; precipitation 1.98 mm/day; wind 3.06 m/s.
• Ottawa February: mean -10.13 °C, change from January +1.21 °C; max–min span 48.21 °C; humidity 94.35%, change -0.57 points; precipitation 1.96 mm/day; wind 3.43 m/s.
• Ottawa March: mean -3.68 °C, change from February +6.45 °C; max–min span 56.57 °C; humidity 87.07%, change -7.28 points; precipitation 2.08 mm/day; wind 3.23 m/s.
• Ottawa April: mean 4.97 °C, change from March +8.65 °C; max–min span 40.91 °C; humidity 77.78%, change -9.29 points; precipitation 2.84 mm/day; wind 2.80 m/s.
• Ottawa May: mean 12.61 °C, change from April +7.64 °C; max–min span 35.22 °C; humidity 76.80%, change -0.98 points; precipitation 2.75 mm/day; wind 2.15 m/s.
• Ottawa June: mean 17.78 °C, change from May +5.17 °C; max–min span 32.40 °C; humidity 78.53%, change +1.73 points; precipitation 3.46 mm/day; wind 1.85 m/s.
• Ottawa July: mean 20.57 °C, change from June +2.79 °C; max–min span 28.28 °C; humidity 78.84%, change +0.31 points; precipitation 3.17 mm/day; wind 1.72 m/s.
• Ottawa August: mean 19.69 °C, change from July -0.88 °C; max–min span 27.81 °C; humidity 77.67%, change -1.17 points; precipitation 2.84 mm/day; wind 1.73 m/s.
• Ottawa September: mean 15.68 °C, change from August -4.01 °C; max–min span 34.42 °C; humidity 77.58%, change -0.09 points; precipitation 2.91 mm/day; wind 1.88 m/s.
• Ottawa October: mean 8.14 °C, change from September -7.54 °C; max–min span 32.88 °C; humidity 80.93%, change +3.35 points; precipitation 3.20 mm/day; wind 2.17 m/s.
• Ottawa November: mean 1.04 °C, change from October -7.10 °C; max–min span 39.02 °C; humidity 85.07%, change +4.14 points; precipitation 2.44 mm/day; wind 2.35 m/s.
• Ottawa December: mean -6.80 °C, change from November -7.84 °C; max–min span 51.88 °C; humidity 92.24%, change +7.17 points; precipitation 2.59 mm/day; wind 2.59 m/s.

Harth retrieved this point climatology from NASA POWER API v2.9.7 for location record 6094817. The ranked fingerprint and transition ledger preserve Ottawa'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: Nepean, Canada
• Climate Design Data: Rosemont–La Petite-Patrie, Canada
• Climate Design Data: Montréal, Canada
• Climate Design Data: Trois-Rivières, Canada
• All climate & energy design data guidance for Canada
• Daylight & Orientation: Ottawa, Canada
• Solar Altitude & Azimuth: Ottawa, Canada
• Solar Shading Design: Ottawa, Canada
• Sun Path: Ottawa, Canada

Sources and method

Location data from the GeoNames CA dump (CC BY 4.0, snapshot 2026-08-31, GeoNames ID 6094817). 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