Confidence: Verified against Environment Canada 1981–2010 Climate Normals.
Winter-grade Type B diesel covers the SWO January monthly mean (~−12 °C) but not extreme-minimum nights without operability additives or Type A. The climate numbers below are the operational reason fleets carry anti-gel additives as a second line of defence, and the reason yards in unheated locations are exposed during a polar-vortex event.
| Station | Climate ID | Elevation | Jan daily mean min | Extreme minimum |
|---|---|---|---|---|
| Waterloo Wellington A | 6149387 | 317 m | −12.1 °C | −31.5 °C |
| London CYXU | (London Int'l Airport) | — | −10.7 °C | −31.7 °C |
Kitchener-Waterloo averages 64 frosty days per year; the region sees lows in the minus-twenties on roughly six nights per year, most often in January.
Type B winter diesel at CFPP −20 °C covers the January monthly mean but does not cover an extreme-minimum night. Operators with unheated outdoor yards through a polar-vortex event need either:
op-winter-diesel-blending).These figures support the winter-diesel article in the Resources section. On the marketing-page side, the takeaway is operational rather than numeric: "the coldest nights in Waterloo and London are colder than the standard winter blend was designed for, which is why we treat our deliveries past Halloween." Don't put extreme-minimum °C figures on a sector landing page — they belong in the article body or the source-attribution footer.