Can you see the northern lights in Glace Bay in May?

On dark, clear nights with enough activity. 31 of 31 nights at Glace Bay have civil darkness, and 4% of past May days reached Kp 6.

How dark is Glace Bay in May?

Glace Bay averages 7.7 hours of civil night a night in May 2027, from 8 h 24 min on the 1st to 7 h 6 min on the last night.

How cloudy is Glace Bay in May?

NASA POWER's 2001 to 2020 climatology gives Glace Bay's 1 degree cell 74% mean cloud in May, against 79% for the whole year. It is an all-hours average, not a forecast.

What is the best night in May 2027 for aurora in Glace Bay?

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

Is May or June better in Glace Bay?

By civil night times the clear share, May scores 2.0 hours at Glace Bay and June 1.8. May comes out ahead.

Glace Bay · May 2027

Northern lights in Glace Bay in May 2027

Answer

May gives Glace Bay 7.7 hours of civil night on the 15th, the 10th darkest of its 12 months, under 74% mean cloud. 4% of May days since 1996 reached Kp 6, enough for the oval edge to reach Glace Bay.

7.7 h

civil night, average night

SunCalc for 46.20, -59.96; NASA POWER; GFZ Kp

May against the rest of the year

1.0

1.5

2.1

2.2

2.0

1.8

2.0

2.9

3.4

2.9

1.9

1.0

May cloud at Glace Bay averages 74% in NASA POWER's 2001 to 2020 record, 5 points clearer than its yearly mean. August is Glace Bay's clearest month at 67%. By civil night times clear sky, May scores 2.0 hours at Glace Bay, 7th of 12. Sydney, 19 km away, averages 72%, clearer by 2 points.

Civil night at Glace Bay starts May at 8 h 24 min and reaches 7 h 6 min by May 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 4.3 hours on the 15th.

May night by night

May opens toward a new moon on May 6, with full moon on May 20, in America/Glace_Bay dates. Glace Bay gets 121 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: May 1 (4 h), May 2 (4 h), May 3 (4 h).

1
20% lit
7.0 h
2
13% lit
7.3 h
3
7% lit
7.6 h
4
2% lit
8.0 h
5
0% lit
8.2 h
6
1% lit
7.9 h
New
7
4% lit
6.6 h
8
10% lit
5.5 h
9
17% lit
4.5 h
10
27% lit
3.7 h
11
38% lit
3.1 h
12
49% lit
2.7 h
13
61% lit
2.3 h
14
71% lit
1.9 h
15
80% lit
1.6 h
16
88% lit
1.3 h
17
94% lit
0.9 h
18
98% lit
0.4 h
19
100% lit
0.0 h
20
99% lit
0.2 h
Full
21
97% lit
1.2 h
22
93% lit
2.0 h
23
88% lit
2.7 h
24
81% lit
3.2 h
25
73% lit
3.6 h
26
64% lit
4.0 h
27
55% lit
4.2 h
28
45% lit
4.5 h
29
35% lit
4.8 h
30
26% lit
5.0 h
31
17% lit
5.4 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 Mays

Glace Bay needs Kp 6 for the average oval edge to sit overhead. 39 of the 930 May days from 1996 to 2025 (4%) reached it in the GFZ Potsdam record, 4th of 12 months; storm days with Kp 5 or more made up 10%. Glace Bay sits at 55.1 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.

May across Canada

No month-page town in Canada has more civil night on May 15 than Glace Bay; the national median is 7.0 hours. Coming from April (9.3 hours at Glace Bay), May loses darkness, and June brings shorter nights (6.8 hours on the 15th).

Civil night on May 15 and May cloud, month-page towns in Canada
Town	Civil night	Cloud
Glace Bay	7.7 h	74%
Greater Sudbury	7.7 h	64%
Trois-Rivières	7.7 h	66%
Sydney	7.7 h	72%
Québec	7.6 h	69%
St. John's	7.5 h	77%
Saguenay	7.4 h	71%
Thunder Bay	7.4 h	73%
Lethbridge	7.2 h	65%
Winnipeg	7.1 h	60%
Kelowna	7.1 h	68%
Regina	7.0 h	62%

Darkness and moon, every night

Glace Bay, May 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
Sat May 1	8 h 24 min	5 h 24 min	7 h 3 min	4 h	20%
Sun May 2	8 h 21 min	5 h 20 min	7 h 18 min	4 h	13%
Mon May 3	8 h 18 min	5 h 15 min	7 h 36 min	4 h	7%
Tue May 4	8 h 14 min	5 h 10 min	7 h 57 min	4 h	2%
Wed May 5	8 h 11 min	5 h 6 min	8 h 11 min	4 h	0%
Thu May 6	8 h 8 min	5 h 1 min	7 h 56 min	4 h	1%
Fri May 7	8 h 5 min	4 h 56 min	6 h 37 min	3 h 39 min	4%
Sat May 8	8 h 2 min	4 h 52 min	5 h 27 min	2 h 29 min	10%
Sun May 9	8 h	4 h 47 min	4 h 29 min	1 h 33 min	17%
Mon May 10	7 h 57 min	4 h 42 min	3 h 44 min	49 min	27%
Tue May 11	7 h 54 min	4 h 38 min	3 h 9 min	16 min	38%
Wed May 12	7 h 51 min	4 h 33 min	2 h 41 min	0 min	49%
Thu May 13	7 h 48 min	4 h 28 min	2 h 18 min	0 min	61%
Fri May 14	7 h 45 min	4 h 24 min	1 h 57 min	0 min	71%
Sat May 15	7 h 43 min	4 h 19 min	1 h 37 min	0 min	80%
Sun May 16	7 h 40 min	4 h 15 min	1 h 16 min	0 min	88%
Mon May 17	7 h 37 min	4 h 10 min	53 min	0 min	94%
Tue May 18	7 h 35 min	4 h 5 min	26 min	0 min	98%
Wed May 19	7 h 32 min	4 h 1 min	0 min	0 min	100%
Thu May 20	7 h 30 min	3 h 56 min	14 min	0 min	99%
Fri May 21	7 h 27 min	3 h 52 min	1 h 13 min	26 min	97%
Sat May 22	7 h 25 min	3 h 47 min	2 h 3 min	1 h 16 min	93%
Sun May 23	7 h 23 min	3 h 43 min	2 h 42 min	1 h 57 min	88%
Mon May 24	7 h 20 min	3 h 39 min	3 h 13 min	2 h 29 min	81%
Tue May 25	7 h 18 min	3 h 34 min	3 h 37 min	2 h 54 min	73%
Wed May 26	7 h 16 min	3 h 30 min	3 h 57 min	3 h 16 min	64%
Thu May 27	7 h 14 min	3 h 26 min	4 h 14 min	3 h 34 min	55%
Fri May 28	7 h 12 min	3 h 22 min	4 h 30 min	3 h 51 min	45%
Sat May 29	7 h 10 min	3 h 17 min	4 h 46 min	4 h	35%
Sun May 30	7 h 8 min	3 h 13 min	5 h 2 min	4 h	26%
Mon May 31	7 h 6 min	3 h 10 min	5 h 22 min	4 h	17%

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

Questions

Can you see the northern lights in Glace Bay in May?: On dark, clear nights with enough activity. 31 of 31 nights at Glace Bay have civil darkness, and 4% of past May days reached Kp 6.
How dark is Glace Bay in May?: Glace Bay averages 7.7 hours of civil night a night in May 2027, from 8 h 24 min on the 1st to 7 h 6 min on the last night.
How cloudy is Glace Bay in May?: NASA POWER's 2001 to 2020 climatology gives Glace Bay's 1 degree cell 74% mean cloud in May, against 79% for the whole year. It is an all-hours average, not a forecast.
What is the best night in May 2027 for aurora in Glace Bay?: By darkness and moon alone, May 1, with 4 h of moon-free darkness inside 10 PM to 2 AM at Glace Bay. Activity on that date will only be known hours ahead.
Is May or June better in Glace Bay?: By civil night times the clear share, May scores 2.0 hours at Glace Bay and June 1.8. May 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.