GoodSeeing
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Clinton

38.765° N   76.898° W  ·  76 M
77 /100
PEAK
A genuinely good night — 4 hours of clear, dark sky from 01:00.
BEST WINDOW 01:00–05:00 · ASTRO DARK 22:00–05:00 · MOON 0%
Transparency
0.85
Seeing
1.00
Cloud
2%
Moon
0%

Excellent tonight

Hour by hour, local to Clinton. Colour encodes the score and nothing else; every other measurement is luminance.

Sky state
Lighter = daylight and twilight  ·  unshaded = astronomical dark
Score
20
21
22
23
00
01
02
03
04
05
06
0
14
32
34
31
38
77
67
72
55
0
BEST WINDOW
Low cloud
0%
6%
9%
6%
8%
15%
2%
6%
5%
1%
0%
Mid cloud
12%
35%
26%
23%
41%
41%
2%
4%
3%
0%
0%
High cloud
79%
61%
88%
75%
50%
24%
0%
14%
2%
4%
0%
Transparency
0.98
0.85
0.79
0.44
0.36
0.54
0.50
0.48
0.47
0.46
0.45
Seeing
0.85
0.88
0.88
0.98
0.87
0.98
1.00
1.00
1.00
0.98
0.94
Moon clear
0%
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Inspect

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

Why this hour scored what it did
20 Clouded out · 0/100
Starting from
100
Cloud
−49
Transparency
−0
Seeing
−2
Moonlight
−0
Darkness
−48
Score
0
CLOUD 81% LOW 0% MID 12% HIGH 79% SUN 0.4° MOON 3.9° / 0% WIND 4 TEMP 31°
Excellent 75+ Good 55+ Fair 35+ Poor 15+ Not worth it Seeing is estimated from surface wind — see how we score.
Tonight's limiting factor
What the GoodSeeing score actually measures

One number from 0 to 100 per hour, combining cloud, transparency, seeing, moonlight and darkness. Cloud gates everything else — no amount of steady, dark air rescues an overcast sky.

What are you doing tonight?

The same forecast, weighted for the target. Planetary work barely cares about moonlight; long exposures die on high cloud a visual observer would never notice.

SET UP 00:30 · OBSERVE 01:00–06:00 · 5H · MEAN 60

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

202200020406
HIGH CLOUD CLEARS 01:00TWILIGHT BEGINS 06:00
SET UP 00:30 · OBSERVE 01:00–06:00 · 5H · MEAN 74

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

202200020406
HIGH CLOUD CLEARS 01:00TWILIGHT BEGINS 06:00MOONLIGHT IGNORED FOR THIS TARGET
SET UP 01:30 · OBSERVE 02:00–06:00 · 4H · MEAN 63

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

202200020406
HIGH CLOUD CLEARS 02:00TWILIGHT BEGINS 06:00
SET UP 01:30 · OBSERVE 02:00–06:00 · 4H · MEAN 55

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

202200020406
HIGH CLOUD CLEARS 02:00TWILIGHT BEGINS 06:00
SET UP 01:30 · OBSERVE 02:00–06:00 · 4H · MEAN 68

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

202200020406
HIGH CLOUD CLEARS 02:00TWILIGHT BEGINS 06:00
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The next week of nights

Tonight · 12 Aug
77
Excellent
MOON 0%
01:00–05:00
Tomorrow · 13 Aug
67
Good
MOON 3%
22:00–03:00
Friday · 14 Aug
22
Poor
MOON 7%
Saturday · 15 Aug
72
Good
MOON 15%
02:00–03:00
Sunday · 16 Aug
41
Fair
MOON 23%
02:00–03:00
Monday · 17 Aug
40
Fair
MOON 32%
02:00–03:00
Tuesday · 18 Aug
78
Excellent
MOON 42%
02:00–03:00
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Nearby locations

About this forecast

Conditions for Clinton, Maryland, United States 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 how dark the sky actually gets. Read the full method →