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Irvine

55.619° N   4.655° W  ·  14 M
42 /100
PEAK
Marginal, but there is a 2 hours gap from 00:00.
BEST WINDOW 00:00–02:00 · ASTRO DARK 01:00–03:00 · MOON 0%
Transparency
0.49
Seeing
1.00
Cloud
33%
Moon
0%

Fair tonight

Hour by hour, local to Irvine. 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
6
18
37
42
30
36
24
1
0
BEST WINDOW
Low cloud
1%
1%
4%
9%
4%
2%
0%
0%
0%
4%
Mid cloud
14%
15%
16%
13%
8%
23%
8%
8%
13%
22%
High cloud
46%
60%
97%
70%
74%
91%
81%
62%
23%
0%
Transparency
0.45
0.46
0.46
0.49
0.49
0.46
0.42
0.39
0.40
0.38
Seeing
0.98
1.00
1.00
0.96
0.97
0.99
1.00
1.00
1.00
0.99
Moon clear
0%
down
down
down
down
down
down
down
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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
21 Clouded out · 0/100
Starting from
100
Cloud
−35
Transparency
−14
Seeing
−0
Moonlight
−0
Darkness
−50
Score
0
CLOUD 53% LOW 1% MID 14% HIGH 46% SUN -0.5° MOON 1.5° / 0% WIND 2 TEMP 19°
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 00:30 · OBSERVE 01:00–02:00 · 1H · MEAN 39

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

2123010305
CLOUD RETURNS 02:00
SET UP 02:30 · OBSERVE 03:00–05:00 · 2H · MEAN 44

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

2123010305
TWILIGHT 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
CONDITIONS STAY BELOW THE USABLE THRESHOLD
NO USABLE WINDOW FOR THIS TARGET TONIGHT

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

2123010305
CONDITIONS STAY BELOW THE USABLE THRESHOLD
SET UP 00:30 · OBSERVE 01:00–02:00 · 1H · MEAN 35

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

2123010305
CLOUD RETURNS 02:00
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The next week of nights

Tonight · 12 Aug
42
Fair
MOON 0%
00:00–02:00
Tomorrow · 13 Aug
31
Poor
MOON 2%
Friday · 14 Aug
28
Poor
MOON 6%
Saturday · 15 Aug
43
Fair
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
3
Clouded out
MOON 39%
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About this forecast

Conditions for Irvine, 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 →