temperature · Canada
Lytton, British Columbia
June peak daily maximum
Modelled demonstration series · not observed data
The needle is off the paper. A value this far above the record is the signature of a heat dome, not of a warm summer, and it is the kind of departure that statisticians would have called effectively impossible before it happened. The whole point of this instrument is that "impossible" is now something the chart has to draw.
75 years, modelled
Same reading, two normals
| Normal | Mean | σ | Pct | Return |
|---|---|---|---|---|
| 1951–1980 | 33.5 °C | +5.80σ | >99.999th | 1 in 300 million years |
| 1991–2020 | 34.9 °C | +4.46σ | >99.999th | 1 in 250,000 years |
Today would be the highest value in the entire 75-year modelled series. Past the series' standing high of 39.8 °C (1980). Nothing about the reading changes between rows — only the yardstick.
Documented real-world record · well documented
49.6 °C — 29 June 2021
Lytton recorded 49.6 °C during the western North America heat dome — the highest temperature ever measured in Canada. The village was destroyed by fire the following day.
The season here
The Fraser Canyon funnels and compresses air; late June is when a stalled ridge can pin heat into the valley for days.
Where this series comes from
MODELLED SERIES — not observed. June daily-maximum parameters set to published Fraser Canyon climatology. The 75 annual values are synthesised. The real-world record cited separately on this station is documented and is NOT part of this modelled series.
Every number on this page comes from a modelled series: 75 annual values synthesised by a seeded generator from published climatological parameters for Lytton, British Columbia. It shows how anomaly reasoning works. It is not a measurement and must not be cited as one.
How to read σ
σ counts standard deviations from this place's own normal. The sigma guide · return periods.
More temperature stations
Open Lytton on the field →