Was October 23, 2026 a frost advisory in Beauharnois?
NO
No — no frost advisory covers Valleyfield–Beauharnois today; the low was 1.9 °C.
Why
- Today's low 1.9 °C, above the near-zero advisory threshold
- Frost advisories did cover this area Tuesday and Wednesday nights
- Tonight's low near -1 °C, so a fresh advisory is possible