Riihimäki · June 2027
Northern lights in Riihimäki in June 2027
Answer
June against the rest of the year
June cloud at Riihimäki averages 66% in NASA POWER's 2001 to 2020 record, 6 points clearer than its yearly mean. May is Riihimäki's clearest month at 62%. By civil night times clear sky, June scores 0.0 hours at Riihimäki, 12th of 12. Vantaa, 51 km away, averages the same 66%.
Civil night at Riihimäki starts June at 1 h 43 min and reaches 0 min by June 30, 1.7 hours shorter. 24 Riihimäki nights this month have no civil darkness at all. No night keeps the 10 PM to 2 AM window fully dark at Riihimäki. The sun never reaches 18 degrees down, so Riihimäki gets no astronomical night in June.
June night by night
June opens toward a new moon on Jun 4, with full moon on Jun 19, in Europe/Helsinki dates. Riihimäki gets 7 hours of civil night with the moon below the horizon across the month. The best of them for moon-free darkness inside 10 PM to 2 AM: Jun 1 (1 h 33 min), Jun 2 (1 h 27 min), Jun 3 (1 h 21 min).
- 1
11% lit
1.7 h
- 2
5% lit
1.5 h
- 3
1% lit
1.4 h
- 4
0% lit
1.1 h
- 5
2% lit
0.9 h
- 6
6% lit
0.6 h
- 7
13% lit
no night
- 8
22% lit
no night
- 9
33% lit
no night
- 10
44% lit
no night
- 11
55% lit
no night
- 12
65% lit
no night
- 13
75% lit
no night
- 14
84% lit
no night
- 15
90% lit
no night
- 16
95% lit
no night
- 17
99% lit
no night
- 18
100% lit
no night
- 19
99% lit
no night
- 20
97% lit
no night
- 21
93% lit
no night
- 22
87% lit
no night
- 23
80% lit
no night
- 24
72% lit
no night
- 25
63% lit
no night
- 26
53% lit
no night
- 27
43% lit
no night
- 28
33% lit
no night
- 29
23% lit
no night
- 30
15% lit
no night
Each cell is the night that starts on that date. Hours are civil-dark time with the moon below the horizon; the green rule scales with them. Green outline: new moon. Bone outline: full moon.
Activity in past Junes
Riihimäki needs Kp 4 for the average oval edge to sit overhead. 182 of the 900 June days from 1996 to 2025 (20%) reached it in the GFZ Potsdam record, one of the three quietest months for that level; storm days with Kp 5 or more made up 8%. Riihimäki sits at 58.3 degrees geomagnetic. By SWPC's rule the average oval edge is overhead at Kp 4, and aurora is usually visible on the northern horizon at G1 (Kp 5) or less.
June across Finland
Riihimäki ranks 2nd in Finland for civil night on June 15, behind Helsinki at 0.2 hours. Coming from May (4.1 hours at Riihimäki), June loses darkness, and the nights keep growing into July (2.5 hours on the 15th). The June solstice falls on June 21, 17:07 Riihimäki time.
Darkness and moon, every night
| Night | Civil | Astronomical | Moon-free dark | Moon-free, 10 PM to 2 AM | Moon lit |
|---|---|---|---|---|---|
| Tue Jun 1 | 1 h 43 min | 0 min | 1 h 43 min | 1 h 33 min | 11% |
| Wed Jun 2 | 1 h 32 min | 0 min | 1 h 32 min | 1 h 27 min | 5% |
| Thu Jun 3 | 1 h 21 min | 0 min | 1 h 21 min | 1 h 21 min | 1% |
| Fri Jun 4 | 1 h 8 min | 0 min | 1 h 8 min | 1 h 8 min | 0% |
| Sat Jun 5 | 54 min | 0 min | 54 min | 54 min | 2% |
| Sun Jun 6 | 35 min | 0 min | 33 min | 33 min | 6% |
| Mon Jun 7 | 0 min | 0 min | 0 min | 0 min | 13% |
| Tue Jun 8 | 0 min | 0 min | 0 min | 0 min | 22% |
| Wed Jun 9 | 0 min | 0 min | 0 min | 0 min | 33% |
| Thu Jun 10 | 0 min | 0 min | 0 min | 0 min | 44% |
| Fri Jun 11 | 0 min | 0 min | 0 min | 0 min | 55% |
| Sat Jun 12 | 0 min | 0 min | 0 min | 0 min | 65% |
| Sun Jun 13 | 0 min | 0 min | 0 min | 0 min | 75% |
| Mon Jun 14 | 0 min | 0 min | 0 min | 0 min | 84% |
| Tue Jun 15 | 0 min | 0 min | 0 min | 0 min | 90% |
| Wed Jun 16 | 0 min | 0 min | 0 min | 0 min | 95% |
| Thu Jun 17 | 0 min | 0 min | 0 min | 0 min | 99% |
| Fri Jun 18 | 0 min | 0 min | 0 min | 0 min | 100% |
| Sat Jun 19 | 0 min | 0 min | 0 min | 0 min | 99% |
| Sun Jun 20 | 0 min | 0 min | 0 min | 0 min | 97% |
| Mon Jun 21 | 0 min | 0 min | 0 min | 0 min | 93% |
| Tue Jun 22 | 0 min | 0 min | 0 min | 0 min | 87% |
| Wed Jun 23 | 0 min | 0 min | 0 min | 0 min | 80% |
| Thu Jun 24 | 0 min | 0 min | 0 min | 0 min | 72% |
| Fri Jun 25 | 0 min | 0 min | 0 min | 0 min | 63% |
| Sat Jun 26 | 0 min | 0 min | 0 min | 0 min | 53% |
| Sun Jun 27 | 0 min | 0 min | 0 min | 0 min | 43% |
| Mon Jun 28 | 0 min | 0 min | 0 min | 0 min | 33% |
| Tue Jun 29 | 0 min | 0 min | 0 min | 0 min | 23% |
| Wed Jun 30 | 0 min | 0 min | 0 min | 0 min | 15% |
Questions
- Can you see the northern lights in Riihimäki in June?
- On dark, clear nights with enough activity. 6 of 30 nights at Riihimäki have civil darkness, and 20% of past June days reached Kp 4.
- How dark is Riihimäki in June?
- Riihimäki averages 0.2 hours of civil night a night in June 2027, from 1 h 43 min on the 1st to 0 min on the last night.
- How cloudy is Riihimäki in June?
- NASA POWER's 2001 to 2020 climatology gives Riihimäki's 1 degree cell 66% mean cloud in June, against 72% for the whole year. It is an all-hours average, not a forecast.
- What is the best night in June 2027 for aurora in Riihimäki?
- By darkness and moon alone, Jun 1, with 1 h 33 min of moon-free darkness inside 10 PM to 2 AM at Riihimäki. Activity on that date will only be known hours ahead.
- Is June or July better in Riihimäki?
- By civil night times the clear share, June scores 0.0 hours at Riihimäki and July 0.9. July comes out ahead.
Sources and verification
- SunCalchttps://github.com/mourner/suncalc
- NASA POWER climatologyhttps://power.larc.nasa.gov/docs/services/api/temporal/climatology/
- GFZ Potsdam Kp indexhttps://kp.gfz.de/en/data
- NOAA SWPC, Tips on viewing the aurorahttps://www.spaceweather.gov/content/tips-viewing-aurora
Quoted figures last checked against their sources on 2026-09-30; next review 2026-12-31. Computed figures come from SunCalc and the IGRF-14 dipole as described in the methodology. Every quote is listed in the sources ledger.