Can you see the northern lights in Vejle in January?

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

How dark is Vejle in January?

Vejle averages 14.6 hours of civil night a night in January 2027, from 15 h 11 min on the 1st to 13 h 54 min on the last night.

How cloudy is Vejle in January?

NASA POWER's 2001 to 2020 climatology gives Vejle's 1 degree cell 80% mean cloud in January, against 71% for the whole year. It is an all-hours average, not a forecast.

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

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

Is January or February better in Vejle?

By civil night times the clear share, January scores 2.9 hours at Vejle and February 2.7. January comes out ahead.

Vejle · January 2027

Northern lights in Vejle in January 2027

Answer

January gives Vejle 14.7 hours of civil night on the 15th, the 2nd darkest of its 12 months, under 80% mean cloud. 2% of January days since 1996 reached Kp 6, enough for the oval edge to reach Vejle.

14.6 h

civil night, average night

SunCalc for 55.71, 9.54; NASA POWER; GFZ Kp

January against the rest of the year

2.9

2.7

3.2

3.3

2.2

1.4

1.6

2.4

3.3

3.1

January cloud at Vejle averages 80% in NASA POWER's 2001 to 2020 record, 9 points cloudier than its yearly mean. April is Vejle's clearest month at 60%. By civil night times clear sky, January scores 2.9 hours at Vejle, 7th of 12. Odense, 64 km away, averages the same 80%.

Civil night at Vejle starts January at 15 h 11 min and reaches 13 h 54 min by January 31, 1.3 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 11.7 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/Copenhagen dates. Vejle gets 253 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
29% lit
11.2 h
2
20% lit
12.5 h
3
13% lit
13.8 h
4
7% lit
14.9 h
5
3% lit
15.1 h
6
1% lit
15.1 h
7
0% lit
15.0 h
New
8
1% lit
15.0 h
9
4% lit
14.2 h
10
8% lit
12.8 h
11
15% lit
11.5 h
12
22% lit
10.2 h
13
31% lit
8.9 h
14
41% lit
7.5 h
15
51% lit
6.1 h
16
62% lit
4.6 h
17
72% lit
3.0 h
18
82% lit
1.5 h
19
90% lit
0.3 h
20
96% lit
0.0 h
21
99% lit
0.0 h
22
100% lit
0.0 h
Full
23
97% lit
0.9 h
24
92% lit
2.5 h
25
84% lit
4.0 h
26
75% lit
5.4 h
27
65% lit
6.8 h
28
55% lit
8.2 h
29
45% lit
9.6 h
30
36% lit
10.9 h
31
27% lit
12.0 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 Januarys

Vejle 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%. Vejle sits at 55.9 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 Denmark

Vejle ranks 3rd in Denmark for civil night on January 15, behind Aalborg at 14.9 hours. Coming from December (15.3 hours at Vejle), January loses darkness, and February brings shorter nights (12.9 hours on the 15th).

Civil night on January 15 and January cloud, month-page towns in Denmark
Town	Civil night	Cloud
Aalborg	14.9 h	85%
Århus	14.8 h	83%
Vejle	14.7 h	80%
Copenhagen	14.7 h	84%
Odense	14.7 h	80%

Darkness and moon, every night

Vejle, 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	15 h 11 min	12 h 5 min	11 h 10 min	4 h	29%
Sat Jan 2	15 h 9 min	12 h 4 min	12 h 31 min	4 h	20%
Sun Jan 3	15 h 8 min	12 h 3 min	13 h 48 min	4 h	13%
Mon Jan 4	15 h 6 min	12 h 1 min	14 h 54 min	4 h	7%
Tue Jan 5	15 h 5 min	12 h	15 h 5 min	4 h	3%
Wed Jan 6	15 h 3 min	11 h 59 min	15 h 3 min	4 h	1%
Thu Jan 7	15 h 1 min	11 h 57 min	15 h 1 min	4 h	0%
Fri Jan 8	14 h 59 min	11 h 56 min	14 h 59 min	4 h	1%
Sat Jan 9	14 h 57 min	11 h 54 min	14 h 9 min	4 h	4%
Sun Jan 10	14 h 55 min	11 h 52 min	12 h 49 min	4 h	8%
Mon Jan 11	14 h 53 min	11 h 50 min	11 h 30 min	4 h	15%
Tue Jan 12	14 h 51 min	11 h 48 min	10 h 12 min	4 h	22%
Wed Jan 13	14 h 49 min	11 h 46 min	8 h 53 min	2 h 59 min	31%
Thu Jan 14	14 h 46 min	11 h 44 min	7 h 32 min	1 h 38 min	41%
Fri Jan 15	14 h 44 min	11 h 42 min	6 h 6 min	13 min	51%
Sat Jan 16	14 h 41 min	11 h 40 min	4 h 35 min	0 min	62%
Sun Jan 17	14 h 38 min	11 h 38 min	3 h	0 min	72%
Mon Jan 18	14 h 35 min	11 h 35 min	1 h 31 min	0 min	82%
Tue Jan 19	14 h 33 min	11 h 33 min	19 min	0 min	90%
Wed Jan 20	14 h 30 min	11 h 30 min	0 min	0 min	96%
Thu Jan 21	14 h 27 min	11 h 28 min	0 min	0 min	99%
Fri Jan 22	14 h 24 min	11 h 25 min	0 min	0 min	100%
Sat Jan 23	14 h 21 min	11 h 22 min	53 min	0 min	97%
Sun Jan 24	14 h 17 min	11 h 20 min	2 h 28 min	0 min	92%
Mon Jan 25	14 h 14 min	11 h 17 min	3 h 58 min	0 min	84%
Tue Jan 26	14 h 11 min	11 h 14 min	5 h 24 min	53 min	75%
Wed Jan 27	14 h 7 min	11 h 11 min	6 h 48 min	2 h 19 min	65%
Thu Jan 28	14 h 4 min	11 h 8 min	8 h 11 min	3 h 44 min	55%
Fri Jan 29	14 h 1 min	11 h 5 min	9 h 34 min	4 h	45%
Sat Jan 30	13 h 57 min	11 h 2 min	10 h 52 min	4 h	36%
Sun Jan 31	13 h 54 min	10 h 58 min	12 h 2 min	4 h	27%

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

Questions

Can you see the northern lights in Vejle in January?: On dark, clear nights with enough activity. 31 of 31 nights at Vejle have civil darkness, and 2% of past January days reached Kp 6.
How dark is Vejle in January?: Vejle averages 14.6 hours of civil night a night in January 2027, from 15 h 11 min on the 1st to 13 h 54 min on the last night.
How cloudy is Vejle in January?: NASA POWER's 2001 to 2020 climatology gives Vejle's 1 degree cell 80% mean cloud in January, against 71% for the whole year. It is an all-hours average, not a forecast.
What is the best night in January 2027 for aurora in Vejle?: By darkness and moon alone, Jan 1, with 4 h of moon-free darkness inside 10 PM to 2 AM at Vejle. Activity on that date will only be known hours ahead.
Is January or February better in Vejle?: By civil night times the clear share, January scores 2.9 hours at Vejle and February 2.7. 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.