Can you see the northern lights in An Muileann gCearr in June?

On dark, clear nights with enough activity. 30 of 30 nights at An Muileann gCearr have civil darkness, and 8% of past June days reached Kp 5.

How dark is An Muileann gCearr in June?

An Muileann gCearr averages 5.1 hours of civil night a night in June 2027, from 5 h 28 min on the 1st to 5 h 7 min on the last night.

How cloudy is An Muileann gCearr in June?

NASA POWER's 2001 to 2020 climatology gives An Muileann gCearr's 1 degree cell 76% mean cloud in June, against 75% for the whole year. It is an all-hours average, not a forecast.

What is the best night in June 2027 for aurora in An Muileann gCearr?

By darkness and moon alone, Jun 1, with 3 h 17 min of moon-free darkness inside 10 PM to 2 AM at An Muileann gCearr. Activity on that date will only be known hours ahead.

Is June or July better in An Muileann gCearr?

By civil night times the clear share, June scores 1.2 hours at An Muileann gCearr and July 1.3. July comes out ahead.

An Muileann gCearr · June 2027

Northern lights in An Muileann gCearr in June 2027

Answer

June gives An Muileann gCearr 5.0 hours of civil night on the 15th, the lightest month of its year, under 76% mean cloud. 8% of June days since 1996 reached Kp 5, enough for the oval edge to reach An Muileann gCearr.

5.1 h

civil night, average night

SunCalc for 53.52, -7.34; NASA POWER; GFZ Kp

June against the rest of the year

3.2

3.1

2.8

2.3

1.7

1.2

1.3

1.7

2.6

3.1

3.8

3.6

June cloud at An Muileann gCearr averages 76% in NASA POWER's 2001 to 2020 record, close to its yearly mean of 75%. April is An Muileann gCearr's clearest month at 73%. By civil night times clear sky, June scores 1.2 hours at An Muileann gCearr, 12th of 12. Dublin, 75 km away, averages the same 76%.

Civil night at An Muileann gCearr starts June at 5 h 28 min and reaches 5 h 7 min by June 30, 0.3 hours shorter. No night keeps the 10 PM to 2 AM window fully dark at An Muileann gCearr. The sun never reaches 18 degrees down, so An Muileann gCearr 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/Dublin dates. An Muileann gCearr gets 70 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 (3 h 17 min), Jun 2 (3 h 15 min), Jun 3 (3 h 14 min).

1
11% lit
4.5 h
2
5% lit
4.8 h
3
1% lit
5.3 h
4
0% lit
5.3 h
New
5
2% lit
4.7 h
6
7% lit
4.0 h
7
14% lit
3.4 h
8
23% lit
3.1 h
9
33% lit
2.8 h
10
45% lit
2.6 h
11
56% lit
2.4 h
12
66% lit
2.2 h
13
76% lit
2.0 h
14
84% lit
1.7 h
15
91% lit
1.4 h
16
96% lit
0.9 h
17
99% lit
0.3 h
18
100% lit
0.0 h
19
99% lit
0.1 h
Full
20
97% lit
0.5 h
21
92% lit
0.9 h
22
87% lit
1.1 h
23
80% lit
1.3 h
24
71% lit
1.5 h
25
62% lit
1.6 h
26
53% lit
1.8 h
27
42% lit
2.0 h
28
32% lit
2.2 h
29
23% lit
2.5 h
30
14% lit
3.0 h

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

An Muileann gCearr needs Kp 5 for the average oval edge to sit overhead. 73 of the 900 June days from 1996 to 2025 (8%) reached it in the GFZ Potsdam record, 9th of 12 months; storm days with Kp 5 or more made up 8%. An Muileann gCearr sits at 56.4 degrees geomagnetic. By SWPC's rule the average oval edge is overhead at Kp 5, and aurora is usually visible on the northern horizon at G1 (Kp 5) or less.

June across Ireland

An Muileann gCearr ranks 4th in Ireland for civil night on June 15, behind Cork at 5.5 hours. Coming from May (6.4 hours at An Muileann gCearr), June loses darkness, and the nights keep growing into July (5.7 hours on the 15th). The June solstice falls on June 21, 15:07 An Muileann gCearr time.

Civil night on June 15 and June cloud, month-page towns in Ireland
Town	Civil night	Cloud
Cork	5.5 h	69%
Limerick	5.3 h	77%
Dublin	5.1 h	76%
An Muileann gCearr	5.0 h	76%

Darkness and moon, every night

An Muileann gCearr, June 2027: each night from local noon to the next noon
Night	Civil	Moon-free dark	Moon-free, 10 PM to 2 AM	Moon lit
Tue Jun 1	5 h 28 min	4 h 29 min	3 h 17 min	11%
Wed Jun 2	5 h 25 min	4 h 49 min	3 h 15 min	5%
Thu Jun 3	5 h 23 min	5 h 21 min	3 h 14 min	1%
Fri Jun 4	5 h 20 min	5 h 20 min	3 h 12 min	0%
Sat Jun 5	5 h 18 min	4 h 44 min	2 h 37 min	2%
Sun Jun 6	5 h 16 min	3 h 57 min	1 h 52 min	7%
Mon Jun 7	5 h 14 min	3 h 26 min	1 h 21 min	14%
Tue Jun 8	5 h 12 min	3 h 5 min	1 h	23%
Wed Jun 9	5 h 10 min	2 h 48 min	45 min	33%
Thu Jun 10	5 h 8 min	2 h 35 min	32 min	45%
Fri Jun 11	5 h 7 min	2 h 24 min	21 min	56%
Sat Jun 12	5 h 6 min	2 h 12 min	10 min	66%
Sun Jun 13	5 h 4 min	1 h 59 min	0 min	76%
Mon Jun 14	5 h 3 min	1 h 43 min	0 min	84%
Tue Jun 15	5 h 2 min	1 h 23 min	0 min	91%
Wed Jun 16	5 h 2 min	55 min	0 min	96%
Thu Jun 17	5 h 1 min	16 min	0 min	99%
Fri Jun 18	5 h	0 min	0 min	100%
Sat Jun 19	5 h	4 min	4 min	99%
Sun Jun 20	5 h	32 min	32 min	97%
Mon Jun 21	5 h	53 min	53 min	92%
Tue Jun 22	5 h	1 h 8 min	1 h 8 min	87%
Wed Jun 23	5 h	1 h 20 min	1 h 20 min	80%
Thu Jun 24	5 h 1 min	1 h 30 min	1 h 30 min	71%
Fri Jun 25	5 h 1 min	1 h 39 min	1 h 39 min	62%
Sat Jun 26	5 h 2 min	1 h 49 min	1 h 49 min	53%
Sun Jun 27	5 h 3 min	2 h	2 h	42%
Mon Jun 28	5 h 4 min	2 h 14 min	2 h 14 min	32%
Tue Jun 29	5 h 5 min	2 h 33 min	2 h 33 min	23%
Wed Jun 30	5 h 7 min	3 h	3 h	14%

Moon lit: SunCalc illuminated fraction at the middle of the 10 PM to 2 AM window.

Questions

Can you see the northern lights in An Muileann gCearr in June?: On dark, clear nights with enough activity. 30 of 30 nights at An Muileann gCearr have civil darkness, and 8% of past June days reached Kp 5.
How dark is An Muileann gCearr in June?: An Muileann gCearr averages 5.1 hours of civil night a night in June 2027, from 5 h 28 min on the 1st to 5 h 7 min on the last night.
How cloudy is An Muileann gCearr in June?: NASA POWER's 2001 to 2020 climatology gives An Muileann gCearr's 1 degree cell 76% mean cloud in June, against 75% for the whole year. It is an all-hours average, not a forecast.
What is the best night in June 2027 for aurora in An Muileann gCearr?: By darkness and moon alone, Jun 1, with 3 h 17 min of moon-free darkness inside 10 PM to 2 AM at An Muileann gCearr. Activity on that date will only be known hours ahead.
Is June or July better in An Muileann gCearr?: By civil night times the clear share, June scores 1.2 hours at An Muileann gCearr and July 1.3. 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.