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Tonight · peak score /100

45Fair

04:00–07:00

best window

Limited by

Transparency

Why this matters

Transparency 0.46 — haze and water vapour will cost you the faintest targets. Read the guide →

Site details and actions

Site darkness · peer measure

Bright skyNot multiplied into the conditions score

19.7–20.3 mag/arcsec²

The score describes tonight’s conditions. Site darkness helps you choose what to observe.

See target outlook ↓Planet observing times →

Best months at Fort McMurray, Alberta →Moonless nights →

Tonight in context · local sky & season

November historically: 0.7 qualifying nights/month on average (2005–2024). Regional cloud and darkness history, not tonight’s probability or a comparison with the conditions score.

A qualifying historical night has at least 3 hours of astronomical darkness and mean nighttime cloud ≤30%. This does not measure steady air or target visibility. Seasonal history →

Saturn: about 7.0h above 20° during this observing night’s darkness. Longest sampled dark-time opportunity among our four planet targets; not a weather ranking. Planet times →

Position calculations use roughly 20-minute samples. Clouds, skyglow and local obstructions still matter. Milky Way timing →

Best window

04:00 – 07:00

Window quality

41 / 100 avg

Astronomical dark

01:00 – 07:00

Moon

Waning crescent, 32%

Transparency at peak

0.46

Seeing at peak (est.)

0.77

Visual limit (modelled)

4.0–5.5 mag

The night, hour by hour

Colour = score · Luminance = everything else

Score 0–100 · underline marks the best window · local time (America/Edmonton)
Hour	01	02	03	04	05	06	07	08
Score	37	43	10	38	45	41	32	0
Cloud %	73	55	96	66	41	46	32	33
Transp. 0–1	0.28	0.29	0.32	0.43	0.46	0.43	0.39	0.35
Seeing est. /1	0.91	0.91	0.88	0.84	0.77	0.76	0.78	0.80
Moon alt. °	-2	4	12	20	27	34	39	43
Darkness	Dark	Dark	Dark	Dark	Dark	Dark	Twil.	Twil.

Inspect all cloud layers and score factors

Sky state

Shaded = daylight and twilight · unshaded = astronomical dark

Score

BEST WINDOW · 4 H

Low cloud

Mid cloud

17%

23%

82%

33%

40%

46%

32%

33%

High cloud

67%

41%

80%

48%

Transparency

0.28

0.29

0.32

0.43

0.46

0.43

0.39

0.35

Seeing

0.91

0.88

0.84

0.77

0.76

0.78

0.80

Moon clear

down

34%

33%

32%

31%

Inspect

Cloud tracks show clear sky — a longer bar is better. The figure inside each track is the raw measurement.

Score inspectorWhy this hour scored what it did Open peakClose

05 Fair · 45/100

Starting from

100

Cloud

−37

Transparency

−14

Seeing

−3

Moonlight

−1

Darkness

−0

Score

CLOUD 41% LOW 0% MID 40% HIGH 5% SUN -30.0° MOON 27.1° / 33% WIND 4 TEMP 2°

Excellent 75+ Good 55+ Fair 35+ Poor 15+ Not worth it Seeing is estimated from surface wind — see how we score.

What can you actually do tonight?

This is GoodSeeing’s decision layer: the same forecast is weighted for your target and site darkness. Planetary work barely cares about moonlight; long exposures can fail on high cloud a visual observer would barely notice. Your choice is remembered on this device and becomes the default for new alert rules.

Deep-sky visualPlanetary & lunarWide-field imagingLong exposureMeteor watching

NO USABLE WINDOW FOR THIS TARGET TONIGHT

Darkness and moonlight dominate. Faint fuzzies need a genuinely dark sky more than they need steady air.

01030507

SITE GLOW LIMITS THIS TARGET

SET UP 03:30 · OBSERVE 04:00–08:00 · 4H · MEAN 47

Seeing is everything and moonlight is irrelevant. Bright targets punch through twilight, so darkness barely counts.

01030507

HIGH CLOUD CLEARS 04:00TWILIGHT BEGINS 08:00MOONLIGHT IGNORED FOR THIS TARGET

NO USABLE WINDOW FOR THIS TARGET TONIGHT

Tolerates soft seeing, but high cloud wrecks a wide frame and moonlight raises the background everywhere.

01030507

SITE GLOW LIMITS THIS TARGET

NO USABLE WINDOW FOR THIS TARGET TONIGHT

Needs conditions to hold still for hours. Sustained transparency matters more than any single good hour.

01030507

CONDITIONS STAY BELOW THE USABLE THRESHOLD

NO USABLE WINDOW FOR THIS TARGET TONIGHT

Naked eye, whole sky. Total cloud and moonlight are the only things that count.

01030507

SITE GLOW LIMITS THIS TARGET

Deep-sky visual is your current default.

A darker option

Wood Buffalo National Park

310 km away · Natural-dark sky · 21.9–21.9 mag/arcsec²

2conditions tonight

See the trade-off →

The next week of nights

Tonight
2 Nov45Moon 32%Cloud or fog is the strongest score limit at the best sampled time. ↓

Score 0–100 · underline marks the best window · local time (America/Edmonton)
Hour	01	02	03	04	05	06	07	08
Score	37	43	10	38	45	41	32	0
Cloud %	73	55	96	66	41	46	32	33
Transp. 0–1	0.28	0.29	0.32	0.43	0.46	0.43	0.39	0.35
Seeing est. /1	0.91	0.91	0.88	0.84	0.77	0.76	0.78	0.80
Moon alt. °	-2	4	12	20	27	34	39	43
Darkness	Dark	Dark	Dark	Dark	Dark	Dark	Twil.	Twil.

All factors for this night

Sky state

Shaded = daylight and twilight · unshaded = astronomical dark

Score

Low cloud

Mid cloud

17%

23%

82%

33%

40%

46%

32%

33%

High cloud

67%

41%

80%

48%

Transparency

0.28

0.29

0.32

0.43

0.46

0.43

0.39

0.35

Seeing

0.91

0.88

0.84

0.77

0.76

0.78

0.80

Moon clear

down

34%

33%

32%

31%

Cloud tracks show clear sky — a longer bar is better. The figure inside each track is the raw measurement.

Tomorrow
3 Nov63Moon 25%Reduced transparency is the strongest score limit at the best sampled time. ↓

Score 0–100 · underline marks the best window · local time (America/Edmonton)
Hour	18	19	20	21	22	23	00	01	02	03	04	05	06	07	08	09
Score	0	14	30	42	47	48	60	63	62	62	57	30	32	0	0	0
Cloud %	67	62	69	49	31	29	6	0	1	1	5	30	33	96	98	95
Transp. 0–1	0.20	0.14	0.10	0.10	0.10	0.10	0.10	0.10	0.10	0.10	0.10	0.10	0.10	0.10	0.10	0.10
Seeing est. /1	0.88	0.90	0.92	0.94	0.93	0.95	0.93	0.91	0.92	0.93	0.93	0.96	1.00	1.00	0.96	0.98
Moon alt. °	-14	-20	-24	-26	-26	-24	-20	-14	-7	1	8	16	23	29	34	36
Darkness	Twil.	Twil.	Dark	Dark	Dark	Dark	Dark	Dark	Dark	Dark	Dark	Dark	Dark	Twil.	Twil.	Day

All factors for this night

Sky state

Shaded = daylight and twilight · unshaded = astronomical dark

Score

Low cloud

30%

27%

95%

97%

95%

Mid cloud

21%

43%

40%

18%

20%

21%

16%

13%

10%

High cloud

59%

33%

48%

38%

15%

11%

Transparency

0.20

0.14

0.10

Seeing

0.88

0.90

0.92

0.94

0.93

0.95

0.93

0.91

0.92

0.93

0.96

1.00

0.96

0.98

Moon clear

down

23%

22%

21%

Cloud tracks show clear sky — a longer bar is better. The figure inside each track is the raw measurement.

Wednesday
4 Nov61Moon 16%Reduced transparency is the strongest score limit at the best sampled time. ↓

Score 0–100 · underline marks the best window · local time (America/Edmonton)
Hour	18	19	20	21	22	23	00	01	02	03	04	05	06	07	08	09
Score	0	28	58	59	59	61	60	60	60	60	60	60	59	39	1	0
Cloud %	2	2	2	2	2	0	0	0	0	0	0	0	2	6	6	4
Transp. 0–1	0.10	0.10	0.10	0.10	0.10	0.10	0.10	0.10	0.10	0.10	0.10	0.10	0.10	0.10	0.10	0.10
Seeing est. /1	0.84	0.83	0.82	0.82	0.82	0.79	0.77	0.76	0.76	0.78	0.77	0.76	0.75	0.76	0.76	0.75
Moon alt. °	-15	-22	-27	-31	-33	-32	-29	-25	-18	-11	-3	4	12	19	24	28
Darkness	Twil.	Twil.	Dark	Dark	Dark	Dark	Dark	Dark	Dark	Dark	Dark	Dark	Dark	Twil.	Twil.	Day

All factors for this night

Sky state

Shaded = daylight and twilight · unshaded = astronomical dark

Score

Low cloud

Mid cloud

High cloud

Transparency

0.10

Seeing

0.84

0.83

0.82

0.79

0.77

0.76

0.78

0.77

0.76

0.75

0.76

0.75

Moon clear

down

14%

13%

Cloud tracks show clear sky — a longer bar is better. The figure inside each track is the raw measurement.

Thursday
5 Nov63Moon 9%Reduced transparency is the strongest score limit at the best sampled time. ↓

Score 0–100 · underline marks the best window · local time (America/Edmonton)
Hour	18	00	06	12
Score	0	60	63	0
Cloud %	19	5	0	90
Transp. 0–1	0.10	0.10	0.10	0.41
Seeing est. /1	0.92	0.86	0.94	1.00
Moon alt. °	-15	-38	1	23
Darkness	Twil.	Dark	Dark	Day

All factors for this night

Sky state

Shaded = daylight and twilight · unshaded = astronomical dark

Score

Low cloud

Mid cloud

15%

33%

High cloud

88%

Transparency

0.10

0.41

Seeing

0.92

0.86

0.94

1.00

Moon clear

down

Cloud tracks show clear sky — a longer bar is better. The figure inside each track is the raw measurement.

Friday
6 Nov62Moon 4%Reduced transparency is the strongest score limit at the best sampled time. ↓

Score 0–100 · underline marks the best window · local time (America/Edmonton)
Hour	18	00	06	12
Score	0	62	6	0
Cloud %	19	0	98	0
Transp. 0–1	0.17	0.10	0.24	0.45
Seeing est. /1	0.95	0.85	0.68	0.75
Moon alt. °	-14	-45	-10	18
Darkness	Twil.	Dark	Dark	Day

All factors for this night

Sky state

Shaded = daylight and twilight · unshaded = astronomical dark

Score

Low cloud

Mid cloud

15%

88%

High cloud

95%

Transparency

0.17

0.10

0.24

0.45

Seeing

0.95

0.85

0.68

0.75

Moon clear

down

Cloud tracks show clear sky — a longer bar is better. The figure inside each track is the raw measurement.

Saturday
7 Nov62Moon 1%Reduced transparency is the strongest score limit at the best sampled time. ↓

Score 0–100 · underline marks the best window · local time (America/Edmonton)
Hour	18	00	06	12
Score	0	62	51	0
Cloud %	0	7	36	100
Transp. 0–1	0.24	0.10	0.10	0.37
Seeing est. /1	0.82	1.00	0.95	0.70
Moon alt. °	-12	-51	-20	13
Darkness	Twil.	Dark	Dark	Day

All factors for this night

Sky state

Shaded = daylight and twilight · unshaded = astronomical dark

Score

Low cloud

Mid cloud

100%

High cloud

35%

79%

Transparency

0.24

0.10

0.37

Seeing

0.82

1.00

0.95

0.70

Moon clear

down

Cloud tracks show clear sky — a longer bar is better. The figure inside each track is the raw measurement.

Sunday
8 Nov62Moon 0%Reduced transparency is the strongest score limit at the best sampled time. ↓

Score 0–100 · underline marks the best window · local time (America/Edmonton)
Hour	18	00	06	12
Score	0	55	62	0
Cloud %	57	22	12	0
Transp. 0–1	0.15	0.16	0.25	0.54
Seeing est. /1	0.99	0.77	0.77	0.83
Moon alt. °	-10	-53	-30	8
Darkness	Twil.	Dark	Dark	Day

All factors for this night

Sky state

Shaded = daylight and twilight · unshaded = astronomical dark

Score

Low cloud

Mid cloud

16%

High cloud

48%

22%

12%

Transparency

0.15

0.16

0.25

0.54

Seeing

0.99

0.77

0.83

Moon clear

down

Cloud tracks show clear sky — a longer bar is better. The figure inside each track is the raw measurement.

Tap a night for its hours. Later forecasts may have wider time steps; missing hours are not interpolated.

Planning a trip?

Compare the next eight weekends → · Best months to visit → · Moonless nights →

About this forecast

Exact-coordinate weather, sky geometry and site context.

Full method →20-year baseline →

Sources and scoring details openclose

Conditions for Fort McMurray, Alberta, Canada are computed from the MET Norway forecast model for these exact coordinates, combined with sun and moon positions we calculate directly. The score weighs cloud cover by layer, atmospheric transparency, estimated seeing, moonlight and astronomical twilight. Site darkness is shown separately, then used only where artificial skyglow physically changes moon contrast, haze scattering, visual limits and target suitability.