GoodSeeing
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Gloucester

51.866° N   2.243° W  ·  24 M
95 /100
PEAK
A genuinely good night — 5 hours of clear, dark sky from 23:00.
BEST WINDOW 23:00–04:00 · ASTRO DARK 00:00–04:00 · MOON 0%
Transparency
0.95
Seeing
1.00
Cloud
0%
Moon
0%

Excellent tonight

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

Sky state
Lighter = daylight and twilight  ·  unshaded = astronomical dark
Score
21
22
23
00
01
02
03
04
05
06
0
39
82
93
93
94
95
65
11
0
BEST WINDOW
Low cloud
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
Mid cloud
2%
5%
8%
2%
1%
1%
0%
0%
0%
0%
High cloud
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
Transparency
1.00
0.95
0.91
0.91
0.91
0.92
0.90
0.88
0.83
0.78
Seeing
0.87
0.89
0.93
0.93
0.91
0.91
0.96
1.00
1.00
1.00
Moon clear
down
down
down
down
down
down
down
down
down
down
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
21 Clouded out · 0/100
Starting from
100
Cloud
−2
Transparency
−0
Seeing
−3
Moonlight
−0
Darkness
−95
Score
0
CLOUD 2% LOW 0% MID 2% HIGH 0% SUN -3.6° MOON -1.1° / 0% WIND 3 TEMP 28°
Excellent 75+ Good 55+ Fair 35+ Poor 15+ Not worth it Seeing is estimated from surface wind — see how we score.

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 22:30 · OBSERVE 23:00–05:00 · 6H · MEAN 86

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

2123010305
ASTRONOMICAL DARK FROM 23:00TWILIGHT BEGINS 05:00
SET UP 21:30 · OBSERVE 22:00–06:00 · 8H · MEAN 85

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

2123010305
TWILIGHT BEGINS 06:00MOONLIGHT IGNORED FOR THIS TARGET
SET UP 22:30 · OBSERVE 23:00–05:00 · 6H · MEAN 86

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

2123010305
ASTRONOMICAL DARK FROM 23:00TWILIGHT BEGINS 05:00
SET UP 22:30 · OBSERVE 23:00–05:00 · 6H · MEAN 84

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

2123010305
ASTRONOMICAL DARK FROM 23:00TWILIGHT BEGINS 05:00
SET UP 22:30 · OBSERVE 23:00–05:00 · 6H · MEAN 87

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

2123010305
ASTRONOMICAL DARK FROM 23:00TWILIGHT BEGINS 05:00
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The next week of nights

Tonight · 12 Aug
95
Excellent
MOON 0%
23:00–04:00
Tomorrow · 13 Aug
83
Excellent
MOON 2%
23:00–04:00
Friday · 14 Aug
34
Poor
MOON 6%
Saturday · 15 Aug
81
Excellent
MOON 13%
01:00–02:00
Sunday · 16 Aug
70
Good
MOON 21%
01:00–02:00
Monday · 17 Aug
0
Clouded out
MOON 30%
Tuesday · 18 Aug
6
Clouded out
MOON 39%
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Nearby locations

About this forecast

Conditions for Gloucester, United Kingdom 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 →