City of Milford (balance) · September 2027
Northern lights in City of Milford (balance) in September 2027
Answer
September against the rest of the year
September cloud at City of Milford (balance) averages 50% in NASA POWER's 2001 to 2020 record, 9 points clearer than its yearly mean. No month at City of Milford (balance) is clearer. By civil night times clear sky, September scores 5.3 hours at City of Milford (balance), 2nd of 12. Portland, Maine, 355 km away, averages the same 50%.
Civil night at City of Milford (balance) starts September at 9 h 52 min and reaches 11 h 13 min by September 30 as the nights lengthen by 1.4 hours. SWPC's 10 PM to 2 AM window is fully dark on every night. True astronomical darkness, the sun 18 degrees down, lasts 8.3 hours on the 15th.
September night by night
Full moon comes first, on Sep 15, then the new moon on Sep 29, in America/New_York dates. City of Milford (balance) gets 159 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: Sep 1 (4 h), Sep 2 (4 h), Sep 3 (4 h).
- 1
3% lit
9.9 h
- 2
8% lit
9.7 h
- 3
16% lit
9.3 h
- 4
25% lit
8.8 h
- 5
34% lit
8.3 h
- 6
44% lit
7.6 h
- 7
54% lit
6.8 h
- 8
64% lit
5.9 h
- 9
72% lit
5.0 h
- 10
80% lit
3.9 h
- 11
87% lit
2.9 h
- 12
93% lit
1.9 h
- 13
97% lit
0.9 h
- 14
99% lit
0.0 h
- 15
100% lit
0.0 h
- 16
98% lit
0.0 h
- 17
95% lit
0.0 h
- 18
90% lit
0.4 h
- 19
83% lit
0.9 h
- 20
74% lit
1.6 h
- 21
64% lit
2.4 h
- 22
53% lit
3.4 h
- 23
42% lit
4.5 h
- 24
31% lit
5.8 h
- 25
21% lit
7.1 h
- 26
12% lit
8.5 h
- 27
5% lit
9.8 h
- 28
1% lit
11.1 h
- 29
0% lit
11.2 h
- 30
2% lit
11.2 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 Septembers
City of Milford (balance) needs Kp 8 for the average oval edge to sit overhead. 4 of the 900 September days from 1996 to 2025 (0%) reached it in the GFZ Potsdam record, 5th of 12 months; storm days with Kp 5 or more made up 14%. City of Milford (balance) sits at 50.4 degrees geomagnetic. The lowest NOAA storm level whose typical viewing latitude reaches it is G3 (Kp = 7). By SWPC's rule the average oval edge is overhead only at Kp 8.
September across United States
No month-page town in United States has more civil night on September 15 than City of Milford (balance); the national median is 10.4 hours. Coming from August (9.1 hours at City of Milford (balance)), September adds darkness, and the nights keep growing into October (11.9 hours on the 15th). The September equinox falls on September 23, 01:56 City of Milford (balance) time, inside the weeks SWPC links with larger storms.
| Town | Civil night | Cloud |
|---|---|---|
| City of Milford (balance) | 10.5 h | 50% |
| Buffalo | 10.5 h | 57% |
| Portland, Maine | 10.5 h | 50% |
| Minneapolis | 10.4 h | 49% |
| Duluth | 10.4 h | 56% |
| Fargo | 10.4 h | 50% |
| Seattle | 10.3 h | 53% |
| Juneau | 9.8 h | 81% |
| Anchorage | 9.5 h | 78% |
| Eagle River | 9.5 h | 78% |
| Fairbanks | 9.2 h | 72% |
Darkness and moon, every night
| Night | Civil | Astronomical | Moon-free dark | Moon-free, 10 PM to 2 AM | Moon lit |
|---|---|---|---|---|---|
| Wed Sep 1 | 9 h 52 min | 7 h 34 min | 9 h 52 min | 4 h | 3% |
| Thu Sep 2 | 9 h 55 min | 7 h 37 min | 9 h 44 min | 4 h | 8% |
| Fri Sep 3 | 9 h 58 min | 7 h 40 min | 9 h 18 min | 4 h | 16% |
| Sat Sep 4 | 10 h 1 min | 7 h 44 min | 8 h 49 min | 4 h | 25% |
| Sun Sep 5 | 10 h 3 min | 7 h 47 min | 8 h 15 min | 4 h | 34% |
| Mon Sep 6 | 10 h 6 min | 7 h 50 min | 7 h 35 min | 3 h 41 min | 44% |
| Tue Sep 7 | 10 h 9 min | 7 h 53 min | 6 h 48 min | 2 h 53 min | 54% |
| Wed Sep 8 | 10 h 12 min | 7 h 57 min | 5 h 55 min | 1 h 59 min | 64% |
| Thu Sep 9 | 10 h 15 min | 8 h | 4 h 57 min | 1 h | 72% |
| Fri Sep 10 | 10 h 17 min | 8 h 3 min | 3 h 56 min | 0 min | 80% |
| Sat Sep 11 | 10 h 20 min | 8 h 6 min | 2 h 55 min | 0 min | 87% |
| Sun Sep 12 | 10 h 23 min | 8 h 9 min | 1 h 54 min | 0 min | 93% |
| Mon Sep 13 | 10 h 26 min | 8 h 13 min | 53 min | 0 min | 97% |
| Tue Sep 14 | 10 h 28 min | 8 h 16 min | 0 min | 0 min | 99% |
| Wed Sep 15 | 10 h 31 min | 8 h 19 min | 0 min | 0 min | 100% |
| Thu Sep 16 | 10 h 34 min | 8 h 22 min | 0 min | 0 min | 98% |
| Fri Sep 17 | 10 h 37 min | 8 h 25 min | 0 min | 0 min | 95% |
| Sat Sep 18 | 10 h 40 min | 8 h 28 min | 25 min | 0 min | 90% |
| Sun Sep 19 | 10 h 42 min | 8 h 31 min | 57 min | 0 min | 83% |
| Mon Sep 20 | 10 h 45 min | 8 h 34 min | 1 h 36 min | 0 min | 74% |
| Tue Sep 21 | 10 h 48 min | 8 h 37 min | 2 h 25 min | 0 min | 64% |
| Wed Sep 22 | 10 h 51 min | 8 h 40 min | 3 h 24 min | 44 min | 53% |
| Thu Sep 23 | 10 h 53 min | 8 h 43 min | 4 h 33 min | 1 h 51 min | 42% |
| Fri Sep 24 | 10 h 56 min | 8 h 46 min | 5 h 49 min | 3 h 6 min | 31% |
| Sat Sep 25 | 10 h 59 min | 8 h 49 min | 7 h 8 min | 4 h | 21% |
| Sun Sep 26 | 11 h 2 min | 8 h 52 min | 8 h 28 min | 4 h | 12% |
| Mon Sep 27 | 11 h 4 min | 8 h 55 min | 9 h 46 min | 4 h | 5% |
| Tue Sep 28 | 11 h 7 min | 8 h 58 min | 11 h 3 min | 4 h | 1% |
| Wed Sep 29 | 11 h 10 min | 9 h 1 min | 11 h 10 min | 4 h | 0% |
| Thu Sep 30 | 11 h 13 min | 9 h 4 min | 11 h 13 min | 4 h | 2% |
Questions
- Can you see the northern lights in City of Milford (balance) in September?
- On dark, clear nights with enough activity. 30 of 30 nights at City of Milford (balance) have civil darkness, and 0% of past September days reached Kp 8.
- How dark is City of Milford (balance) in September?
- City of Milford (balance) averages 10.5 hours of civil night a night in September 2027, from 9 h 52 min on the 1st to 11 h 13 min on the last night.
- How cloudy is City of Milford (balance) in September?
- NASA POWER's 2001 to 2020 climatology gives City of Milford (balance)'s 1 degree cell 50% mean cloud in September, against 59% for the whole year. It is an all-hours average, not a forecast.
- What is the best night in September 2027 for aurora in City of Milford (balance)?
- By darkness and moon alone, Sep 1, with 4 h of moon-free darkness inside 10 PM to 2 AM at City of Milford (balance). Activity on that date will only be known hours ahead.
- Is September or October better in City of Milford (balance)?
- By civil night times the clear share, September scores 5.3 hours at City of Milford (balance) and October 5.0. September 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.