Michigan, United States
Northern lights in Ann Arbor
Answer
Tonight
Waiting on darkness
It is not civil-dark yet. The next dusk is listed below.
Observed 11:55 UTC, forecast 13:26 UTC, 91 min lead
Clock times in America/Detroit
Valid 12:00 to 13:00 UTC
Storm level needed
Ann Arbor sits at 42.28N 83.74W in Michigan, United States. The IGRF-14 centered dipole puts Ann Arbor at 51.3 degrees geomagnetic latitude, 9.0 degrees closer to the magnetic pole than its map latitude suggests. Ann Arbor sits at 51.3 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.
"aurora has been seen as low as Illinois and Oregon (typically 50° geomagnetic lat.)"
The nearest other Glow towns are Novi (31 km), Livonia (33 km), Taylor (39 km). Novi sits 0.2 degrees higher on the dipole and needs the same Kp.
Approximate: SWPC calls its Kp to latitude rule an average, and a centered dipole can differ by a degree from fuller field models. How the storm level is matched
The year in darkness
Every night of 2026 at Ann Arbor has some civil darkness; the shortest month sample still has 7.5 hours. Every evening of the year at Ann Arbor clears Glow's dark-season bar of 4 hours of civil night between 18:00 and 06:00. Ann Arbor's longest night of the year, Dec 19, has 13 h 46 min of civil night.
Solar midnight at Ann Arbor, when the sun is lowest, falls at 00:30 on local clocks on December 15 and 01:35 on June 15. That is 30 min after midnight in December and 1 h 35 min after midnight in June, the gap set by daylight saving and the equation of time. So at Ann Arbor the darkest hour sits near the middle of SWPC's 10 PM to 2 AM window in winter.
Month by month
| Month | Night | Civil | Cloud | Clear dark | |
|---|---|---|---|---|---|
| Jan | 13.4 h | 11.2 h | 77% | 3.1 h | |
| Feb | 12.3 h | 10.2 h | 72% | 3.4 h | |
| Mar | 11.0 h | 8.8 h | 68% | 3.5 h | |
| Apr | 9.5 h | 7.1 h | 64% | 3.4 h | |
| May | 8.2 h | 5.3 h | 64% | 3.0 h | |
| Jun | 7.5 h | 4.1 h | 56% | 3.3 h | |
| Jul | 7.8 h | 4.7 h | 50% | 3.9 h | |
| Aug | 9.0 h | 6.5 h | 49% | 4.6 h | |
| Sep | 10.5 h | 8.3 h | 49% | 5.4 hbest | |
| Oct | 11.9 h | 9.7 h | 63% | 4.4 h | |
| Nov | 13.1 h | 10.9 h | 69% | 4.1 h | |
| Dec | 13.8 h | 11.4 h | 79% | 2.9 h |
By the 15th-of-the-month sample, December is the darkest month at Ann Arbor with 13.8 hours of civil night and June the lightest at 7.5. Across the year Ann Arbor gets 3,896 hours of civil night. Astronomical night at Ann Arbor, the sun 18 degrees or more below the horizon, lasts 11.4 hours on December 15.
NASA POWER's 2001 to 2020 all-hours climatology puts mean cloud amount for the 1 degree cell around Ann Arbor at 63% across the year, from 49% in August to 79% in December. In the months with at least 4 hours of civil night Ann Arbor averages 63%, against a median of 61% for Glow towns in United States.
Multiplying civil night by the clear share of the sky gives September the best score, 5.4 hours, ahead of August at 4.6. Ann Arbor's equinox months score 3.5 in March and 5.4 in September, the weeks SWPC links with larger storms.
Kp history
From 1996 to 2025, the GFZ Potsdam record shows a 3-hour Kp of 8 or more, the level that puts the average oval edge over Ann Arbor, on 0% of days. At Ann Arbor's level the share runs from 0% in February to 1% in November, while storm days with Kp 5 or more made up 10%.
Share of UTC days in each calendar month whose highest 3-hour Kp reached Kp 8. Kp history by year
Moon, next 30 nights
Over the 30 nights from Oct 1, the new moon falls on Oct 10 and the full moon on Oct 26, in America/Detroit dates. 15 of the 30 nights at Ann Arbor have at least 2 moon-free dark hours inside 10 PM to 2 AM, and Oct 5 has the most at 4 h. Tonight Ann Arbor has 11 h 16 min of civil night, 2 h 26 min of it with the moon down.
- 1
66% lit
2.4 h
- 2
55% lit
3.5 h
- 3
43% lit
4.8 h
- 4
32% lit
6.1 h
- 5
22% lit
7.4 h
- 6
14% lit
8.6 h
- 7
7% lit
9.8 h
- 8
3% lit
11.0 h
- 9
0% lit
11.6 h
- 10
0% lit
11.7 h
- 11
3% lit
11.7 h
- 12
7% lit
11.7 h
- 13
12% lit
11.2 h
- 14
19% lit
10.5 h
- 15
27% lit
9.8 h
- 16
36% lit
8.8 h
- 17
45% lit
7.9 h
- 18
55% lit
6.8 h
- 19
64% lit
5.8 h
- 20
73% lit
4.7 h
- 21
82% lit
3.6 h
- 22
89% lit
2.5 h
- 23
95% lit
1.3 h
- 24
99% lit
0.1 h
- 25
100% lit
0.0 h
- 26
98% lit
0.0 h
- 27
94% lit
0.1 h
- 28
88% lit
1.0 h
- 29
79% lit
2.1 h
- 30
69% lit
3.3 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.
Within United States
Among the 15 Glow towns in Michigan, Ann Arbor ranks 12th by dipole latitude against a regional median of 51.5 degrees; Marquette sits highest at 55.4. Among the 136 Glow towns in United States, Ann Arbor ranks 79th by dipole latitude against a national median of 51.5 degrees; Fairbanks sits highest at 65.7. On December 15 Ann Arbor gets 13.8 hours of civil night, 52nd longest of 136 in United States, where the median is 13.8.
Questions
- Can you see the northern lights in Ann Arbor?
- Ann Arbor sits at 51.3 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. Clear, dark sky over Ann Arbor still decides it.
- When is it dark enough in Ann Arbor?
- Every night at Ann Arbor has civil darkness. Tonight has 11 h 16 min, and December 15 has 13.8 hours.
- What is the best month for aurora in Ann Arbor?
- September, by civil night at Ann Arbor times the clear share of the sky from NASA POWER's 2001 to 2020 average.
- How cloudy is Ann Arbor in the dark months?
- About 63% mean cloud amount over Ann Arbor in the months with at least 4 hours of civil night, from NASA POWER's 2001 to 2020 all-hours climatology.
- How often is activity high enough for Ann Arbor?
- A 3-hour Kp of 8 or more, the level that puts the average oval edge overhead, occurred on 0% of days from 1996 to 2025 in the GFZ Potsdam record.
Nearby and related
Nearest Glow towns
Ann Arbor by month
Region and comparisons