Alberta, Canada
Northern lights in Okotoks
Answer
Tonight
Darkness window open
Civil darkness has begun.
Observed 11:49 UTC, forecast 13:20 UTC, 91 min lead
Clock times in America/Edmonton
Storm level needed
Okotoks sits at 50.73N 113.98W in Alberta, Canada. The IGRF-14 centered dipole puts Okotoks at 57.2 degrees geomagnetic latitude, 6.5 degrees closer to the magnetic pole than its map latitude suggests. Okotoks sits at 57.2 degrees geomagnetic. By SWPC's rule the average oval edge is overhead at Kp 5, and aurora is usually visible on the northern horizon at G1 (Kp 5) or less.
"aurora is commonly visible at high latitudes (northern Michigan and Maine)"
The nearest other Glow towns are Calgary (36 km), Chestermere (36 km), Cochrane (61 km). Calgary sits 0.3 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 Okotoks has some civil darkness; the shortest month sample still has 5.8 hours. Every evening of the year at Okotoks clears Glow's dark-season bar of 4 hours of civil night between 18:00 and 06:00. Okotoks's longest night of the year, Dec 17, has 14 h 37 min of civil night.
Solar midnight at Okotoks, when the sun is lowest, falls at 01:31 on local clocks on December 15 and 01:36 on June 15. That is 1 h 31 min after midnight in December and 1 h 36 min after midnight in June, the gap set by daylight saving and the equation of time. So at Okotoks the darkest hour sits late in SWPC's 10 PM to 2 AM window.
Month by month
| Month | Night | Civil | Cloud | Clear dark | |
|---|---|---|---|---|---|
| Jan | 14.2 h | 11.5 h | 73% | 3.8 h | |
| Feb | 12.6 h | 10.1 h | 73% | 3.4 h | |
| Mar | 10.9 h | 8.3 h | 72% | 3.1 h | |
| Apr | 8.8 h | 5.8 h | 70% | 2.7 h | |
| May | 7.0 h | 2.3 h | 65% | 2.4 h | |
| Jun | 5.8 h | 0.0 h | 62% | 2.2 h | |
| Jul | 6.4 h | 0.0 h | 46% | 3.5 h | |
| Aug | 8.2 h | 4.7 h | 52% | 3.9 h | |
| Sep | 10.2 h | 7.5 h | 59% | 4.2 hbest | |
| Oct | 12.1 h | 9.6 h | 67% | 4.0 h | |
| Nov | 13.8 h | 11.1 h | 73% | 3.7 h | |
| Dec | 14.6 h | 11.9 h | 76% | 3.5 h |
By the 15th-of-the-month sample, December is the darkest month at Okotoks with 14.6 hours of civil night and June the lightest at 5.8. Across the year Okotoks gets 3,785 hours of civil night. Astronomical night at Okotoks, the sun 18 degrees or more below the horizon, lasts 11.9 hours on December 15.
NASA POWER's 2001 to 2020 all-hours climatology puts mean cloud amount for the 1 degree cell around Okotoks at 66% across the year, from 46% in July to 76% in December. In the months with at least 4 hours of civil night Okotoks averages 66%, against a median of 67% for Glow towns in Canada.
Multiplying civil night by the clear share of the sky gives September the best score, 4.2 hours, ahead of October at 4.0. Okotoks's equinox months score 3.1 in March and 4.2 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 5 or more, the level that puts the average oval edge over Okotoks, on 10% of days. At Okotoks's level the share runs from 5% in December to 14% in September, 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 5. 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 25, in America/Edmonton dates. 14 of the 30 nights at Okotoks have at least 2 moon-free dark hours inside 10 PM to 2 AM, and Oct 5 has the most at 4 h. Tonight Okotoks has 11 h 13 min of civil night, 1 h 43 min of it with the moon down.
- 1
65% lit
1.7 h
- 2
54% lit
2.9 h
- 3
42% lit
4.2 h
- 4
31% lit
5.7 h
- 5
21% lit
7.1 h
- 6
13% lit
8.6 h
- 7
7% lit
9.9 h
- 8
2% lit
11.3 h
- 9
0% lit
11.7 h
- 10
1% lit
11.8 h
- 11
3% lit
11.8 h
- 12
7% lit
11.9 h
- 13
13% lit
11.9 h
- 14
20% lit
11.3 h
- 15
28% lit
10.6 h
- 16
37% lit
9.7 h
- 17
46% lit
8.6 h
- 18
56% lit
7.4 h
- 19
65% lit
6.2 h
- 20
74% lit
5.0 h
- 21
82% lit
3.8 h
- 22
90% lit
2.5 h
- 23
95% lit
1.2 h
- 24
99% lit
0.0 h
- 25
100% lit
0.0 h
- 26
98% lit
0.0 h
- 27
94% lit
0.0 h
- 28
87% lit
0.5 h
- 29
78% lit
1.6 h
- 30
68% lit
2.9 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.
Within Canada
Among the 17 Glow towns in Alberta, Okotoks ranks 15th by dipole latitude against a regional median of 58.7 degrees; Fort McMurray sits highest at 63.4. Among the 130 Glow towns in Canada, Okotoks ranks 41st by dipole latitude against a national median of 55.3 degrees; Yellowknife sits highest at 68.5. On December 15 Okotoks gets 14.6 hours of civil night, 22nd longest of 130 in Canada, where the median is 14.2.
Questions
- Can you see the northern lights in Okotoks?
- Okotoks sits at 57.2 degrees geomagnetic. By SWPC's rule the average oval edge is overhead at Kp 5, and aurora is usually visible on the northern horizon at G1 (Kp 5) or less. Clear, dark sky over Okotoks still decides it.
- When is it dark enough in Okotoks?
- Every night at Okotoks has civil darkness. Tonight has 11 h 13 min, and December 15 has 14.6 hours.
- What is the best month for aurora in Okotoks?
- September, by civil night at Okotoks times the clear share of the sky from NASA POWER's 2001 to 2020 average.
- How cloudy is Okotoks in the dark months?
- About 66% mean cloud amount over Okotoks 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 Okotoks?
- A 3-hour Kp of 5 or more, the level that puts the average oval edge overhead, occurred on 10% of days from 1996 to 2025 in the GFZ Potsdam record.
Nearby and related
Nearest Glow towns
Okotoks by month
Region and comparisons