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Danville

37.646° N   84.772° W  ·  305 M
41 /100
PEAK
Marginal, but there is a 2 hours gap from 03:00.
BEST WINDOW 03:00–05:00 · ASTRO DARK 23:00–06:00 · MOON 0%
Transparency
0.27
Seeing
0.89
Cloud
66%
Moon
0%

Fair tonight

Hour by hour, local to Danville. 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
07
0
29
26
35
31
33
41
38
30
11
0
BEST WINDOW
Low cloud
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
Mid cloud
2%
9%
19%
0%
0%
0%
0%
2%
0%
0%
1%
High cloud
98%
77%
95%
84%
96%
89%
66%
77%
100%
99%
99%
Transparency
0.28
0.25
0.23
0.22
0.23
0.24
0.26
0.27
0.27
0.27
0.27
Seeing
0.96
0.89
0.77
0.79
0.76
0.71
0.71
0.73
0.78
0.80
0.79
Moon clear
down
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
−54
Transparency
−13
Seeing
−0
Moonlight
−0
Darkness
−32
Score
0
CLOUD 98% LOW 0% MID 2% HIGH 98% SUN -5.2° MOON -1.0° / 0% WIND 2 TEMP 24°
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 02:30 · OBSERVE 03:00–05:00 · 2H · MEAN 38

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

212301030507
HIGH CLOUD CLEARS 03:00CLOUD RETURNS 05:00
SET UP 01:30 · OBSERVE 02:00–05:00 · 3H · MEAN 40

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

212301030507
CLOUD RETURNS 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.

212301030507
CLOUD NEVER DROPS BELOW 66%
NO USABLE WINDOW FOR THIS TARGET TONIGHT

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

212301030507
CLOUD NEVER DROPS BELOW 66%
SET UP 02:30 · OBSERVE 03:00–05:00 · 2H · MEAN 38

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

212301030507
HIGH CLOUD CLEARS 03:00CLOUD RETURNS 05:00
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The next week of nights

Tonight · 12 Aug
41
Fair
MOON 0%
03:00–05:00
Tomorrow · 13 Aug
70
Good
MOON 3%
00:00–06:00
Friday · 14 Aug
83
Excellent
MOON 7%
23:00–03:00
Saturday · 15 Aug
54
Fair
MOON 15%
02:00–03:00
Sunday · 16 Aug
90
Excellent
MOON 23%
02:00–03:00
Monday · 17 Aug
43
Fair
MOON 32%
02:00–03:00
Tuesday · 18 Aug
76
Excellent
MOON 42%
02:00–03:00
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Nearby locations

About this forecast

Conditions for Danville, Kentucky, 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 →