Can you see the northern lights in Cork in January?

On dark, clear nights with enough activity. 31 of 31 nights at Cork have civil darkness, and 2% of past January days reached Kp 6.

How dark is Cork in January?

Cork averages 14.2 hours of civil night a night in January 2027, from 14 h 40 min on the 1st to 13 h 34 min on the last night.

How cloudy is Cork in January?

NASA POWER's 2001 to 2020 climatology gives Cork's 1 degree cell 73% mean cloud in January, against 70% for the whole year. It is an all-hours average, not a forecast.

What is the best night in January 2027 for aurora in Cork?

By darkness and moon alone, Jan 1, with 4 h of moon-free darkness inside 10 PM to 2 AM at Cork. Activity on that date will only be known hours ahead.

Is January or February better in Cork?

By civil night times the clear share, January scores 3.9 hours at Cork and February 3.2. January comes out ahead.

Cork · January 2027

Northern lights in Cork in January 2027

Answer

January gives Cork 14.3 hours of civil night on the 15th, the 2nd darkest of its 12 months, under 73% mean cloud. 2% of January days since 1996 reached Kp 6, enough for the oval edge to reach Cork.

14.2 h

civil night, average night

SunCalc for 51.90, -8.47; NASA POWER; GFZ Kp

January against the rest of the year

3.9

3.2

3.3

3.0

2.1

1.7

2.4

3.2

3.8

4.3

4.1

January cloud at Cork averages 73% in NASA POWER's 2001 to 2020 record, 3 points cloudier than its yearly mean. April is Cork's clearest month at 66%. By civil night times clear sky, January scores 3.9 hours at Cork, 3rd of 12. Limerick, 86 km away, averages 76%, cloudier by 3 points.

Civil night at Cork starts January at 14 h 40 min and reaches 13 h 34 min by January 31, 1.1 hours shorter. SWPC's 10 PM to 2 AM window is fully dark on every night. True astronomical darkness, the sun 18 degrees down, lasts 11.5 hours on the 15th.

January night by night

January opens toward a new moon on Jan 7, with full moon on Jan 22, in Europe/Dublin dates. Cork gets 244 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: Jan 1 (4 h), Jan 2 (4 h), Jan 3 (4 h).

1
28% lit
10.7 h
2
20% lit
11.9 h
3
13% lit
13.1 h
4
7% lit
14.1 h
5
3% lit
14.6 h
6
1% lit
14.6 h
7
0% lit
14.5 h
New
8
1% lit
14.5 h
9
4% lit
13.5 h
10
9% lit
12.3 h
11
15% lit
11.1 h
12
22% lit
9.9 h
13
31% lit
8.6 h
14
41% lit
7.4 h
15
52% lit
6.0 h
16
62% lit
4.6 h
17
73% lit
3.2 h
18
83% lit
1.8 h
19
91% lit
0.6 h
20
96% lit
0.0 h
21
100% lit
0.0 h
22
100% lit
0.0 h
Full
23
97% lit
1.0 h
24
91% lit
2.5 h
25
84% lit
3.9 h
26
75% lit
5.2 h
27
65% lit
6.5 h
28
55% lit
7.8 h
29
45% lit
9.1 h
30
35% lit
10.3 h
31
26% lit
11.3 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 Januarys

Cork needs Kp 6 for the average oval edge to sit overhead. 17 of the 930 January days from 1996 to 2025 (2%) 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 6%. Cork sits at 55.0 degrees geomagnetic. By SWPC's rule the average oval edge is overhead at Kp 6, and aurora is usually visible on the northern horizon at G1 (Kp 5) or less.

January across Ireland

Cork ranks 3rd in Ireland for civil night on January 15, behind Dublin at 14.4 hours. Coming from December (14.7 hours at Cork), January loses darkness, and February brings shorter nights (12.7 hours on the 15th).

Civil night on January 15 and January cloud, month-page towns in Ireland
Town	Civil night	Cloud
Dublin	14.4 h	78%
Limerick	14.4 h	76%
Cork	14.3 h	73%

Darkness and moon, every night

Cork, January 2027: each night from local noon to the next noon
Night	Civil	Astronomical	Moon-free dark	Moon-free, 10 PM to 2 AM	Moon lit
Fri Jan 1	14 h 40 min	11 h 52 min	10 h 40 min	4 h	28%
Sat Jan 2	14 h 39 min	11 h 51 min	11 h 54 min	4 h	20%
Sun Jan 3	14 h 38 min	11 h 50 min	13 h 5 min	4 h	13%
Mon Jan 4	14 h 36 min	11 h 49 min	14 h 7 min	4 h	7%
Tue Jan 5	14 h 35 min	11 h 48 min	14 h 35 min	4 h	3%
Wed Jan 6	14 h 34 min	11 h 47 min	14 h 34 min	4 h	1%
Thu Jan 7	14 h 32 min	11 h 45 min	14 h 32 min	4 h	0%
Fri Jan 8	14 h 30 min	11 h 44 min	14 h 30 min	4 h	1%
Sat Jan 9	14 h 29 min	11 h 43 min	13 h 32 min	4 h	4%
Sun Jan 10	14 h 27 min	11 h 41 min	12 h 18 min	4 h	9%
Mon Jan 11	14 h 25 min	11 h 39 min	11 h 5 min	4 h	15%
Tue Jan 12	14 h 23 min	11 h 38 min	9 h 52 min	3 h 59 min	22%
Wed Jan 13	14 h 21 min	11 h 36 min	8 h 38 min	2 h 45 min	31%
Thu Jan 14	14 h 19 min	11 h 34 min	7 h 22 min	1 h 29 min	41%
Fri Jan 15	14 h 17 min	11 h 32 min	6 h 1 min	10 min	52%
Sat Jan 16	14 h 15 min	11 h 30 min	4 h 37 min	0 min	62%
Sun Jan 17	14 h 12 min	11 h 28 min	3 h 10 min	0 min	73%
Mon Jan 18	14 h 10 min	11 h 26 min	1 h 46 min	0 min	83%
Tue Jan 19	14 h 8 min	11 h 24 min	36 min	0 min	91%
Wed Jan 20	14 h 5 min	11 h 22 min	0 min	0 min	96%
Thu Jan 21	14 h 3 min	11 h 20 min	0 min	0 min	100%
Fri Jan 22	14 h	11 h 18 min	0 min	0 min	100%
Sat Jan 23	13 h 57 min	11 h 15 min	58 min	0 min	97%
Sun Jan 24	13 h 55 min	11 h 13 min	2 h 27 min	0 min	91%
Mon Jan 25	13 h 52 min	11 h 10 min	3 h 51 min	0 min	84%
Tue Jan 26	13 h 49 min	11 h 8 min	5 h 12 min	1 h 4 min	75%
Wed Jan 27	13 h 46 min	11 h 5 min	6 h 31 min	2 h 24 min	65%
Thu Jan 28	13 h 43 min	11 h 3 min	7 h 48 min	3 h 43 min	55%
Fri Jan 29	13 h 40 min	11 h	9 h 4 min	4 h	45%
Sat Jan 30	13 h 37 min	10 h 57 min	10 h 16 min	4 h	35%
Sun Jan 31	13 h 34 min	10 h 54 min	11 h 21 min	4 h	26%

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

Questions

Can you see the northern lights in Cork in January?: On dark, clear nights with enough activity. 31 of 31 nights at Cork have civil darkness, and 2% of past January days reached Kp 6.
How dark is Cork in January?: Cork averages 14.2 hours of civil night a night in January 2027, from 14 h 40 min on the 1st to 13 h 34 min on the last night.
How cloudy is Cork in January?: NASA POWER's 2001 to 2020 climatology gives Cork's 1 degree cell 73% mean cloud in January, against 70% for the whole year. It is an all-hours average, not a forecast.
What is the best night in January 2027 for aurora in Cork?: By darkness and moon alone, Jan 1, with 4 h of moon-free darkness inside 10 PM to 2 AM at Cork. Activity on that date will only be known hours ahead.
Is January or February better in Cork?: By civil night times the clear share, January scores 3.9 hours at Cork and February 3.2. January 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.