Aurora Borealis in Green Bay
United States · 44.52°, -88.02° · geomagnetic 53.5° · needs Kp 7
Tonight in Green Bay
1%
Peak chance of a visible display tonight, from the same model the Revon app runs. Green Bay needs Kp 7 to see anything at all, and tonight the forecast peaks at Kp 4.7. Short of the threshold, which is what most nights look like here.
Updated 2026-08-02 20:20 UTC
The next 30 nights in Green Bay
Every night to come, scored the same way as tonight. The best of the open week is Sunday 2 Aug at 1%. Not one of the seven reaches the Kp 7 that Green Bay needs, which is normal rather than unlucky — it averages 3.2 viable nights a year. The 23 nights past the seven-day window move with the 27-day solar rotation and are updated daily in the app.
Nights 8–30 unlock in the Revon app
See all 30 nights for Green Bay
Revon aurora model over the NOAA Kp forecast and 27-day outlook
How often the aurora borealis reaches Green Bay
3.2 nights a year, averaged across 10.0 years of records
| Storm level | Nights / year |
|---|---|
| Kp 4 | 83.4 |
| Kp 5 | 28.7 |
| Kp 6 | 9.3 |
| Kp 7 | 3.2 |
| Kp 8 | 1.2 |
NOAA planetary Kp, 2016-04-02 to 2026-03-30
Wait for an alert; do not book a week
At Kp 7, Green Bay needs a severe geomagnetic storm before anything shows above the northern horizon. Storms that size arrive a handful of times per solar cycle and announce themselves a day or two ahead. Watching for one beats picking dates and hoping.
Hours of true darkness, month by month
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 11.4 | 10.3 | 8.9 | 7.0 | 5.0 | 3.5 | 4.2 | 6.2 | 8.3 | 9.9 | 11.1 | 11.6 |
Solar declination and hour angle at −18°
Getting clear of the light
The sky over Green Bay reads Bortle 6. Getting clear of the built-up area makes a visible difference on a marginal night.
- 22 km east — around Town of Montpelier → Bortle 5
- 33 km north-east — around Town of Union → Bortle 4
Falchi 2016 World Atlas (DOI: 10.5880/GFZ.1.4.2016.001)
The months that actually deliver
Counting only nights that were both stormy enough and dark enough, May, September and August came out ahead in Green Bay. That is storm season and darkness overlapping — the equinoxes tend to be geomagnetically active, and the nights are already long by then.
Darkest nights of the coming year
A bright moon washes out a weak display as effectively as street lighting. These new moons fall inside the Green Bay viewing season.
- 13 Aug 2026
- 11 Sep 2026
- 11 Oct 2026
- 09 Nov 2026
- 09 Dec 2026
- 07 Jan 2027
- 06 Feb 2027
Where it is close to a certainty
If you would rather plan a trip than wait for a storm, the nearest place with genuinely frequent aurora is Yellowknife, 2,612 km north-north-west in Canada.
| Green Bay | Yellowknife | |
|---|---|---|
| Kp needed | 7 | 3 |
| Nights per year | 3.2 | 171.4 |
| Geomagnetic latitude | 53.5° | 68.6° |
Confirmed reports from this area
141 verified sightings were logged within 300 km of Green Bay between 2015-01-01 and 2016-12-31. Rare is not the same as impossible.
Aurorasaurus verified positive reports
Where the horizon opens up near Green Bay
The display sits low on the northern horizon, so what beats a better forecast is open ground facing that way. Height gets you above the town glow; water gives you an unbroken skyline. These are within a short drive of Green Bay.
- Perkins Park — park3.1 km north-west
- Bay Beach Park — park3.5 km east-north-east
- Birds Tree Island — island4.6 km north-north-east
- Grassy Island — island4.7 km north-north-east
- Peats Lake — bay6.1 km north
- Platten Hill — mountain7.7 km west-north-west
Places from GeoNames (CC BY 4.0)
What to do with the daylight
Aurora watching is a night job, and in winter that leaves a short, bright day to fill. Close to Green Bay you will find WGBP-FM (Green Bay), WGBW-FM (Green Bay) and WQLH-FM (Green Bay), and for a day when the cloud sits low, Neville Public Museum of Brown County and National Railroad Museum are indoors and near by.
Keep the daylight loose: the sky decides the evening, and the forecast can turn within a few hours.
Places from GeoNames (CC BY 4.0)
Where to stay
Anywhere on the outskirts of Green Bay will do; what matters is being able to step outside and check the sky without a drive first.
- Comfort Suites Green Bay 4.7 km from the centre
- Americinn Green Bay 5.7 km from the centre
- Country Inn and Suites By Carlson Green Bay North Wi 9.2 km from the centre
- Green Bay Days Inn Downtown 0.5 km from the centre
- Holiday Inn City Center 0.5 km from the centre
- Days Inn City Centre 0.5 km from the centre
Places from GeoNames (CC BY 4.0) — confirm before booking
The last nights it was visible here
Nights in the last decade when the storm was strong enough for Green Bay and the sky was dark enough to show it.
| Date | Peak |
|---|---|
| 2026-03-20 | Kp 7.0 |
| 2026-01-20 | Kp 7.67 |
| 2026-01-19 | Kp 8.67 |
| 2025-11-12 | Kp 7.33 |
| 2025-11-11 | Kp 8.67 |
NOAA planetary Kp
Know when it is worth going outside
Revon watches the Green Bay forecast and pushes an alert when the odds for tonight clear your threshold — no checking, no guessing.
Common questions about the aurora borealis in Green Bay
Can you see the aurora borealis from Green Bay?
Yes. On the last 10.0 years of NOAA Kp records, Green Bay had about 3.2 nights a year when the storm was strong enough and the sky dark enough at the same time.
What Kp index do you need to see the aurora borealis in Green Bay?
Kp 7. Green Bay sits at geomagnetic latitude 53.5°, and the auroral oval only reaches that far from the pole once activity hits Kp 7. Storms that size occur about 3.2 nights a year.
When is the best time of year to see the aurora borealis in Green Bay?
May, September and August. Those months scored highest once both conditions are counted together: geomagnetic activity and enough hours of real darkness.
Where can you escape the light pollution near Green Bay?
The centre of Green Bay reads Bortle 6. The nearest sky at Bortle 4 is about 33 km north-east around Town of Union. On a marginal night that drive matters more than the forecast does.
Where is the nearest place to Green Bay with reliable aurora borealis?
Yellowknife, Canada — 2,612 km north-north-west. It needs only Kp 3 and averages 171.4 viable nights a year against 3.2 in Green Bay.
Nearby towns
Forecasts for places within reach of Green Bay.