Why Quebec Winter Lights Hang in the Sky

Introduction

On very cold, calm winter nights in Quebec, bright vertical columns can appear to hang silently above towns, roads or industrial sites. To someone seeing them for the first time, these glowing structures can look remarkably like hovering craft, stationary beams or luminous objects suspended in mid-air. In reality, they are usually light pillars: a well-understood atmospheric optical phenomenon produced when tiny ice crystals reflect artificial lighting back towards an observer. Rather than indicating something floating in the sky, the apparent “object” is created by countless reflections from different crystals aligned through the cold air.[The Weather Channel]weather.comThe Weather Channel How Light Pillars Are Formed | The Weather ChannelThe Weather ChannelHow Light Pillars Are Formed | The Weather ChannelNovember 16, 2017…Published: November 16, 2017

Within Quebec’s history of unusual light reports, light pillars provide one of the clearest examples of how striking weather conditions can generate convincing UFO-like appearances. Their importance lies not in explaining every unexplained sighting, but in showing why some winter reports can be resolved through careful attention to weather, lighting and viewing geometry.

How ice crystals build vertical columns of light

Light pillars form when extremely small, flat ice crystals drift through cold, stable air. These plate-shaped crystals tend to settle with their broad faces nearly horizontal, acting like millions of tiny mirrors. Instead of producing a single reflection, each crystal reflects light from a slightly different height. The combined effect is a continuous-looking vertical column extending above—or sometimes below—a bright light source.[atoptics.org.uk]atoptics.org.ukLight PillarsLight Pillars

Artificial light pillars are especially common during episodes of diamond dust, a suspension of minute ice crystals near ground level that develops during intense cold. Quebec’s long winters regularly produce the necessary ingredients:

• temperatures well below freezing;
• calm winds that allow crystals to remain horizontally aligned;
• moisture that freezes directly into airborne ice crystals; and
• numerous bright ground lights from streets, sports facilities, factories and commercial areas.[scienceabc.com]scienceabc.comScience ABCLight Pillars: What Are Those Mysterious Light Beams From The Sky?Light Pillars: What Are Those Mysterious Light Beams From The Sky?February 19, 2020…Published: February 19, 2020

Unlike a searchlight, there is no solid beam travelling upwards. Every point in the apparent pillar is produced by a different collection of crystals reflecting light into the observer’s eyes.

Why hidden lamps make the pillars seem airborne

One reason light pillars generate UFO reports is that the actual light source is often concealed.

A driver approaching a town may see only the glowing columns rising above a distant ridge while the streetlights themselves remain hidden behind hills, forests or buildings. Industrial plants, greenhouse complexes, stadiums or shopping centres can produce particularly bright pillars that appear detached from the ground. From several kilometres away, the observer sees only luminous vertical structures apparently suspended in empty sky.[atoptics.org.uk]atoptics.org.ukLight PillarsLight Pillars

Perspective strengthens the illusion. Because the reflecting crystals are spread through a layer of air between the observer and the hidden lights, the pillar does not occupy one physical location. As with many halo phenomena, the apparent position depends on where the observer stands. This makes the feature seem oddly stable, even though it is simply the geometry of reflected light.[atoptics.org.uk]atoptics.org.ukLight PillarsLight Pillars

Colour also provides a useful clue. The pillar inherits the colour of its source:

• orange or yellow above sodium streetlights;
• white or bluish above modern LED lighting;
• red above aviation warning lights;
• green or other colours above illuminated industrial or commercial facilities.[ScienceABC]scienceabc.comScience ABCLight Pillars: What Are Those Mysterious Light Beams From The Sky?Light Pillars: What Are Those Mysterious Light Beams From The Sky?February 19, 2020…Published: February 19, 2020

Because multiple hidden lights may each generate their own pillar, observers sometimes report rows of evenly spaced “hovering objects” rather than a single light.

Why the pillars can appear to move

Witnesses sometimes describe stationary lights that brighten, fade or shift position without obvious motion.

This behaviour is also consistent with light pillars. Small changes in wind can alter the orientation of the ice crystals, causing parts of the column to brighten while others weaken. Passing patches of diamond dust or freezing fog also change the reflections from moment to moment. The result is a pillar that seems alive despite there being no moving object at all.[The Weather Channel]weather.comThe Weather Channel How Light Pillars Are Formed | The Weather ChannelThe Weather ChannelHow Light Pillars Are Formed | The Weather ChannelNovember 16, 2017…Published: November 16, 2017

Movement of the observer contributes further confusion. While driving, the hidden light source may remain out of sight as the pillar appears to drift sideways, split into several columns or disappear entirely once the viewing angle changes.

Weather and layout clues that strengthen the explanation

Several features strongly favour a light-pillar explanation over an unidentified aerial object.

The most important clues include:

Conversely, if an apparently hovering light travels independently of nearby lighting, changes direction rapidly or is observed under weather conditions unsuitable for suspended ice crystals, other explanations deserve consideration.

Why this matters for Quebec’s unusual-light reports

Quebec combines long periods of severe winter cold with extensive urban, industrial and transport lighting. That makes the province especially favourable for spectacular displays of artificial light pillars. Reports from around Montreal and other populated areas regularly illustrate how dramatic these displays can appear to people unfamiliar with the phenomenon, with observers often initially wondering whether they have seen aircraft, drones or something more unusual.[Reddit]reddit.comLights in the sky!Lights in the sky!January 10, 2025…Published: January 10, 2025

For investigators examining winter UFO reports, checking local weather observations, temperature, wind conditions and nearby lighting infrastructure is therefore an important early step. When photographs reveal multiple vertical columns matching the locations of hidden ground lights during suitable atmospheric conditions, light pillars offer a straightforward, evidence-based explanation.

This does not mean every winter sighting in Quebec is automatically explained by atmospheric optics. Some reports involve different weather, different motion or insufficient evidence for a firm conclusion. However, understanding light pillars helps separate one of the province’s most visually impressive natural optical effects from genuinely unresolved aerial observations, improving the overall quality of UFO case assessment.

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Further Reading

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Endnotes

1. Source: weather.com
Title: The Weather Channel How Light Pillars Are Formed | The Weather Channel
Link:https://weather.com/en-CA/canada/science/news/how-light-pillars-formed

Published: November 16, 2017

2. Source: atoptics.org.uk
Title: Light Pillars
Link:https://www.atoptics.org.uk/halo/lpil.htm

3. Source: scienceabc.com
Title: Science ABCLight Pillars: What Are Those Mysterious Light Beams From The Sky?
Link:https://www.scienceabc.com/nature/what-are-light-pillars

Published: February 19, 2020

4. Source: weather.com
Title: The Weather Channel Weather Words: Light Pillar | Weather.com
Link:https://weather.com/science/weather-explainers/news/2024-12-27-weather-words-light-pillar

Published: January 2, 2025

5. Source: reddit.com
Title: Lights in the sky!
Link:https://www.reddit.com/r/montreal/comments/1hxt0oc

Published: January 10, 2025

6. Source: weather.com
Title: The Science Behind Light Pillars | The Weather Channel
Link:https://weather.com/science/weather-explainers/news/light-pillars-photo-wyoming

Published: January 27, 2017

7. Source: weather.com
Title: By Andrew Mac Farlane•
Link:https://weather.com/science/news/light-pillars-illuminate-skies

Published: December 2, 2015

8. Source: atoptics.org.uk
Title: Joel Bavais (site) saw these strange luminous shapes in th
Link:https://www.atoptics.org.uk/halo/pilpic22.htm

Published: November 20, 2006

9. Source: everything.explained.today
Link:https://everything.explained.today/Light_pillar/

10. Source: weather.gov
Title: Owlie™’s Weird Weather!Haboobs, Sun Dogs, Virga, Halos!
Link:https://www.weather.gov/owlie/weird-weather

11. Source: forecast.weather.gov
Link:https://forecast.weather.gov/glossary.php?word=halo

12. Source: ised-isde.canada.ca
Title: ca Management of Public Reporting of Unidentified Aerial Phenomena in Canada
Link:https://ised-isde.canada.ca/site/science/en/office-chief-science-advisor/sky-canada-project/management-public-reporting-unidentified-aerial-phenomena-canada

Published: June 1, 2025

13. Source: atoptics.co.uk
Title: Light Pillars
Link:https://atoptics.co.uk/blog/light-pillars/

Published: December 16, 2024

Additional References

14. Source: globalnews.ca
Link:https://globalnews.ca/news/4955232/alberta-photographer-light-pillars-lacombe-blackfalds/

Published: February 13, 2019

15. Source: cloudatlas.wmo.int
Link:https://cloudatlas.wmo.int/luminous-pillar.html

16. Source: theweathernetwork.com
Link:https://www.theweathernetwork.com/en/news/weather/severe/photos-from-light-pillars-to-sun-dogs-cold-weather-creates-dazzling-scenes-in-western-canada

Published: January 12, 2024

17. Source: ico-optics.org
Link:https://www.ico-optics.org/winter-atmospheric-optics-sun-dogs-halos-and-light-pillars-explained/

Published: December 15, 2025

18. Source: prod-01-alb-www-noaa.woc.noaa.gov
Link:https://prod-01-alb-www-noaa.woc.noaa.gov/jetstream/synoptic/types-of-weather-phenomena

19. Source: photonews.ca
Title: Ice Crystals, Diamond Dust & Light Pillars: A Night I’ll Never Forget
Link:https://www.photonews.ca/ice-crystals/

Published: January 22, 2018

20. Source: strangesounds.org
Title: Light Pillars Explained: Why Vertical Beams Appear in the Sky
Link:https://strangesounds.org/light-pillars-explained

Published: July 20, 2026

21. Source: vitrinelinguistique.oqlf.gouv.qc.ca
Title: gouv.qc.cacolonne lumineuse | GDTCOLONNE LUMINEUSE Domaines 1
Link:https://vitrinelinguistique.oqlf.gouv.qc.ca/fiche-gdt/fiche/26518944/colonne-lumineuse

22. Source: theweathernetwork.com
Title: The mystique revealed behind halos, sundogs, light pillars and other phenomena
Link:https://www.theweathernetwork.com/en/news/science/explainers/when-the-skies-comes-alive-the-magic-of-ice-crystal-displays

23. Source: youtube.com
Title: RARE but really cool light pillars spotted in Manitoba
Link:https://www.youtube.com/watch?v=O0GEfq2J2K8