Aurora Borealis in Kanta-Häme
Finland · 60.86°, 24.37° · geomagnetic 58.4° · needs Kp 5
Tonight in Kanta-Häme
36%
Peak chance of a visible display tonight, from the same model the Revon app runs. Kanta-Häme needs Kp 5 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.
Get the full 30-night forecast in Revon
Updated 2026-09-08 10:35 UTC
How often the aurora borealis reaches Kanta-Häme
20.4 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
Worth watching through the dark half of the year
Kp 5 is a moderate storm — not an everyday event, but common enough that a patient observer in Kanta-Häme sees the aurora borealis most winters.
Hours of true darkness, month by month
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 12.1 | 10.2 | 7.5 | 2.5 | 0.0 | 0.0 | 0.0 | 0.0 | 6.1 | 9.4 | 11.6 | 12.6 |
Solar declination and hour angle at −18°
Nothing to see from May to August
Through those months the sun never falls more than 18° below the Kanta-Häme horizon, so the sky never darkens fully. Plan around the darker half of the year.
Getting clear of the light
The sky over Kanta-Häme reads Bortle 6. Getting clear of the built-up area makes a visible difference on a marginal night.
- 17 km north-north-east — around Hämeenlinna → Bortle 5
- 48 km north-north-east — around Hämeenlinna → Bortle 3
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, September, March and October came out ahead in Kanta-Häme. 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 Kanta-Häme viewing season.
- 11 Sep 2026
- 11 Oct 2026
- 09 Nov 2026
- 09 Dec 2026
- 07 Jan 2027
- 06 Feb 2027
- 08 Mar 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 Rovaniemi, 630 km north in Finland.
| Kanta-Häme | Rovaniemi | |
|---|---|---|
| Kp needed | 5 | 3 |
| Nights per year | 20.4 | 171.4 |
| Geomagnetic latitude | 58.4° | 63.6° |
Confirmed reports from this area
41 verified sightings were logged within 300 km of Kanta-Häme 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 Kanta-Häme
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 Kanta-Häme.
- Kerminmäki — hill3.1 km north
- Kuivamäki — hill3.4 km east-north-east
- Rapalammi — lake4.4 km north-west
- Kapusaari — headland4.5 km east
- Taimisaari — island4.7 km east
- Pierunkallio — headland4.7 km east-north-east
Places from GeoNames (CC BY 4.0)
The last nights it was visible here
Nights in the last decade when the storm was strong enough for Kanta-Häme and the sky was dark enough to show it.
| Date | Peak |
|---|---|
| 2026-03-24 | Kp 5.0 |
| 2026-03-23 | Kp 5.0 |
| 2026-03-22 | Kp 6.67 |
| 2026-03-21 | Kp 6.0 |
| 2026-03-20 | Kp 7.0 |
NOAA planetary Kp
Aurora forecasts across Kanta-Häme
All 4 places in Kanta-Häme with a forecast page, and the Kp each one needs.
- ForssaKp 5
- HämeenlinnaKp 5
- JanakkalaKp 5
- RiihimäkiKp 5
Know when it is worth going outside
Revon watches the Kanta-Häme forecast and pushes an alert when the odds for tonight clear your threshold — no checking, no guessing.
Common questions about the aurora borealis in Kanta-Häme
Can you see the aurora borealis from Kanta-Häme?
Yes. On the last 10.0 years of NOAA Kp records, Kanta-Häme had about 20.4 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 Kanta-Häme?
Kp 5. Kanta-Häme sits at geomagnetic latitude 58.4°, and the auroral oval only reaches that far from the pole once activity hits Kp 5. Storms that size occur about 28.7 nights a year.
When is the best time of year to see the aurora borealis in Kanta-Häme?
September, March and October. Those months scored highest once both conditions are counted together: geomagnetic activity and enough hours of real darkness. From May to August the sky over Kanta-Häme never gets fully dark, so nothing is visible however strong the storm.
Where can you escape the light pollution near Kanta-Häme?
The centre of Kanta-Häme reads Bortle 6. The nearest sky at Bortle 3 is about 48 km north-north-east around Hämeenlinna. On a marginal night that drive matters more than the forecast does.
Where is the nearest place to Kanta-Häme with reliable aurora borealis?
Rovaniemi, Finland — 630 km north. It needs only Kp 3 and averages 171.4 viable nights a year against 20.4 in Kanta-Häme.
Nearby towns
Forecasts for places within reach of Kanta-Häme.