Can you see the northern lights in Kostomuksha in July?

On dark, clear nights with enough activity. 4 of 31 nights at Kostomuksha have civil darkness, and 43% of past July days reached Kp 3.

How dark is Kostomuksha in July?

Kostomuksha averages 0.2 hours of civil night a night in July 2027, from 0 min on the 1st to 2 h on the last night.

How cloudy is Kostomuksha in July?

NASA POWER's 2001 to 2020 climatology gives Kostomuksha's 1 degree cell 72% mean cloud in July, against 76% for the whole year. It is an all-hours average, not a forecast.

What is the best night in July 2027 for aurora in Kostomuksha?

By darkness and moon alone, Jul 31, with 54 min of moon-free darkness inside 10 PM to 2 AM at Kostomuksha. Activity on that date will only be known hours ahead.

Is July or August better in Kostomuksha?

By civil night times the clear share, July scores 0.0 hours at Kostomuksha and August 1.5. August comes out ahead.

Kostomuksha · July 2027

Northern lights in Kostomuksha in July 2027

Answer

July gives Kostomuksha 0.0 hours of civil night on the 15th, the 10th darkest of its 12 months, under 72% mean cloud. 43% of July days since 1996 reached Kp 3, enough for the oval edge to reach Kostomuksha.

0.2 h

civil night, average night

SunCalc for 64.57, 30.58; NASA POWER; GFZ Kp

July against the rest of the year

3.6

3.0

2.8

1.9

0.0

1.5

2.4

1.8

3.2

July cloud at Kostomuksha averages 72% in NASA POWER's 2001 to 2020 record, 4 points clearer than its yearly mean. June is Kostomuksha's clearest month at 70%. By civil night times clear sky, July scores 0.0 hours at Kostomuksha, 10th of 12. Kajaani, 142 km away, averages 68%, clearer by 4 points.

Civil night at Kostomuksha starts July at 0 min and reaches 2 h by July 31 as the nights lengthen by 2.0 hours. 27 Kostomuksha nights this month have no civil darkness at all. No night keeps the 10 PM to 2 AM window fully dark at Kostomuksha. The sun never reaches 18 degrees down, so Kostomuksha gets no astronomical night in July.

July night by night

July opens toward a new moon on Jul 4, with full moon on Jul 18, in Europe/Moscow dates. Kostomuksha gets 1 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: Jul 31 (54 min).

1
7% lit
no night
2
2% lit
no night
3
0% lit
no night
4
1% lit
no night
New
5
5% lit
no night
6
11% lit
no night
7
20% lit
no night
8
30% lit
no night
9
40% lit
no night
10
51% lit
no night
11
62% lit
no night
12
71% lit
no night
13
80% lit
no night
14
87% lit
no night
15
93% lit
no night
16
97% lit
no night
17
99% lit
no night
18
100% lit
no night
Full
19
99% lit
no night
20
96% lit
no night
21
91% lit
no night
22
85% lit
no night
23
77% lit
no night
24
68% lit
no night
25
59% lit
no night
26
48% lit
no night
27
38% lit
no night
28
27% lit
0.0 h
29
18% lit
0.0 h
30
10% lit
0.0 h
31
4% lit
0.9 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 Julys

Kostomuksha needs Kp 3 for the average oval edge to sit overhead. 403 of the 930 July days from 1996 to 2025 (43%) 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 9%. Kostomuksha sits at 61.1 degrees geomagnetic, inside SWPC's 60 to 75 degree band, where aurora can be seen on more than half of all nights. No storm is needed: by SWPC's rule the average oval edge is overhead at Kp 3.

July across Russia

Kostomuksha ranks 6th in Russia for civil night on July 15, behind Velikiy Novgorod at 3.9 hours. Coming from June (0.0 hours at Kostomuksha), July changes little, and the nights keep growing into August (5.1 hours on the 15th).

Civil night on July 15 and July cloud, month-page towns in Russia
Town	Civil night	Cloud
Velikiy Novgorod	3.9 h	63%
Kolpino	3.2 h	65%
Saint Petersburg	3.1 h	65%
Syktyvkar	1.4 h	63%
Petrozavodsk	1.2 h	70%
Kostomuksha	0.0 h	72%
Arkhangel'sk	0.0 h	65%
Murmansk	0.0 h	75%
Severodvinsk	0.0 h	66%
Norilsk	0.0 h	69%
Noyabrsk	0.0 h	66%
Ukhta	0.0 h	65%

Darkness and moon, every night

Kostomuksha, July 2027: each night from local noon to the next noon
Night	Civil	Moon-free dark	Moon-free, 10 PM to 2 AM	Moon lit
Thu Jul 1	0 min	0 min	0 min	7%
Fri Jul 2	0 min	0 min	0 min	2%
Sat Jul 3	0 min	0 min	0 min	0%
Sun Jul 4	0 min	0 min	0 min	1%
Mon Jul 5	0 min	0 min	0 min	5%
Tue Jul 6	0 min	0 min	0 min	11%
Wed Jul 7	0 min	0 min	0 min	20%
Thu Jul 8	0 min	0 min	0 min	30%
Fri Jul 9	0 min	0 min	0 min	40%
Sat Jul 10	0 min	0 min	0 min	51%
Sun Jul 11	0 min	0 min	0 min	62%
Mon Jul 12	0 min	0 min	0 min	71%
Tue Jul 13	0 min	0 min	0 min	80%
Wed Jul 14	0 min	0 min	0 min	87%
Thu Jul 15	0 min	0 min	0 min	93%
Fri Jul 16	0 min	0 min	0 min	97%
Sat Jul 17	0 min	0 min	0 min	99%
Sun Jul 18	0 min	0 min	0 min	100%
Mon Jul 19	0 min	0 min	0 min	99%
Tue Jul 20	0 min	0 min	0 min	96%
Wed Jul 21	0 min	0 min	0 min	91%
Thu Jul 22	0 min	0 min	0 min	85%
Fri Jul 23	0 min	0 min	0 min	77%
Sat Jul 24	0 min	0 min	0 min	68%
Sun Jul 25	0 min	0 min	0 min	59%
Mon Jul 26	0 min	0 min	0 min	48%
Tue Jul 27	0 min	0 min	0 min	38%
Wed Jul 28	38 min	0 min	0 min	27%
Thu Jul 29	1 h 15 min	0 min	0 min	18%
Fri Jul 30	1 h 40 min	0 min	0 min	10%
Sat Jul 31	2 h	54 min	54 min	4%

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

Questions

Can you see the northern lights in Kostomuksha in July?: On dark, clear nights with enough activity. 4 of 31 nights at Kostomuksha have civil darkness, and 43% of past July days reached Kp 3.
How dark is Kostomuksha in July?: Kostomuksha averages 0.2 hours of civil night a night in July 2027, from 0 min on the 1st to 2 h on the last night.
How cloudy is Kostomuksha in July?: NASA POWER's 2001 to 2020 climatology gives Kostomuksha's 1 degree cell 72% mean cloud in July, against 76% for the whole year. It is an all-hours average, not a forecast.
What is the best night in July 2027 for aurora in Kostomuksha?: By darkness and moon alone, Jul 31, with 54 min of moon-free darkness inside 10 PM to 2 AM at Kostomuksha. Activity on that date will only be known hours ahead.
Is July or August better in Kostomuksha?: By civil night times the clear share, July scores 0.0 hours at Kostomuksha and August 1.5. August 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.