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Bonnyrigg

55.873° N   3.105° W  ·  103 M
40 /100
PEAK
Marginal, but there is a 1 hour gap from 02:00.
BEST WINDOW 02:00–03:00 · ASTRO DARK 01:00–03:00 · MOON 0%
Transparency
0.65
Seeing
0.99
Cloud
56%
Moon
0%

Fair tonight

Hour by hour, local to Bonnyrigg. 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
0
9
26
18
23
40
30
19
0
BEST WINDOW
Low cloud
1%
1%
2%
4%
8%
9%
4%
0%
0%
Mid cloud
15%
6%
16%
61%
45%
17%
9%
1%
2%
High cloud
75%
52%
70%
65%
83%
60%
84%
80%
56%
Transparency
0.68
0.65
0.59
0.23
0.48
0.44
0.40
0.41
0.42
Seeing
0.84
0.81
0.81
0.87
0.97
0.99
0.93
0.83
0.82
Moon clear
0%
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
−49
Transparency
−6
Seeing
−2
Moonlight
−0
Darkness
−42
Score
0
CLOUD 79% LOW 1% MID 15% HIGH 75% SUN -1.2° MOON 0.9° / 0% WIND 4 TEMP 21°
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 01:30 · OBSERVE 02:00–03:00 · 1H · MEAN 38

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

2123010305
HIGH CLOUD CLEARS 02:00CLOUD RETURNS 03:00
SET UP 01:30 · OBSERVE 02:00–05:00 · 3H · MEAN 39

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

2123010305
HIGH CLOUD CLEARS 02:00TWILIGHT BEGINS 05:00MOONLIGHT 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.

2123010305
CLOUD NEVER DROPS BELOW 56%
NO USABLE WINDOW FOR THIS TARGET TONIGHT

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

2123010305
CLOUD NEVER DROPS BELOW 56%
NO USABLE WINDOW FOR THIS TARGET TONIGHT

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

2123010305
CLOUD NEVER DROPS BELOW 56%
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The next week of nights

Tonight · 12 Aug
40
Fair
MOON 0%
02:00–03:00
Tomorrow · 13 Aug
62
Good
MOON 2%
01:00–04:00
Friday · 14 Aug
64
Good
MOON 6%
00:00–04:00
Saturday · 15 Aug
54
Fair
MOON 13%
01:00–02:00
Sunday · 16 Aug
49
Fair
MOON 21%
01:00–02:00
Monday · 17 Aug
7
Clouded out
MOON 30%
Tuesday · 18 Aug
0
Clouded out
MOON 39%
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Nearby locations

About this forecast

Conditions for Bonnyrigg, 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 →