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Sugar Hill

34.106° N   84.034° W  ·  352 M
43 /100
PEAK
Marginal, but there is a 1 hour gap from 05:00.
BEST WINDOW 05:00–06:00 · ASTRO DARK 22:00–06:00 · MOON 0%
Transparency
0.28
Seeing
1.00
Cloud
25%
Moon
0%

Fair tonight

Hour by hour, local to Sugar Hill. 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
07
0
4
38
31
29
29
31
30
30
43
25
0
BEST WINDOW
Low cloud
5%
1%
0%
1%
0%
0%
0%
0%
1%
2%
3%
12%
Mid cloud
4%
2%
3%
2%
8%
0%
0%
0%
0%
0%
0%
0%
High cloud
87%
73%
81%
87%
89%
98%
97%
99%
97%
59%
23%
1%
Transparency
0.10
0.28
0.27
0.10
0.10
0.10
0.19
0.19
0.18
0.18
0.18
0.18
Seeing
0.89
0.86
1.00
0.81
0.83
0.95
0.94
0.93
0.88
0.86
0.83
0.82
Moon clear
0%
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
20 Clouded out · 0/100
Starting from
100
Cloud
−52
Transparency
−17
Seeing
−1
Moonlight
−0
Darkness
−30
Score
0
CLOUD 88% LOW 5% MID 4% HIGH 87% SUN 4.5° MOON 8.3° / 0% WIND 3 TEMP 26°
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
When a clear gap is worth driving for

Ask how long the gap is relative to your setup time and your exposure length. A two-hour gap is a real session for a visual observer and close to worthless for someone doing four-minute subs on a target that needs three hours.

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 04:30 · OBSERVE 05:00–06:00 · 1H · MEAN 41

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

202200020406
HIGH CLOUD CLEARS 05:00TWILIGHT BEGINS 06:00
SET UP 00:30 · OBSERVE 01:00–07:00 · 6H · MEAN 41

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

202200020406
TWILIGHT BEGINS 07:00MOONLIGHT 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.

202200020406
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.

202200020406
CONDITIONS STAY BELOW THE USABLE THRESHOLD
SET UP 04:30 · OBSERVE 05:00–06:00 · 1H · MEAN 41

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

202200020406
HIGH CLOUD CLEARS 05:00TWILIGHT BEGINS 06:00
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The next week of nights

Tonight · 12 Aug
43
Fair
MOON 0%
05:00–06:00
Tomorrow · 13 Aug
68
Good
MOON 3%
22:00–06:00
Friday · 14 Aug
70
Good
MOON 7%
22:00–03:00
Saturday · 15 Aug
69
Good
MOON 15%
02:00–03:00
Sunday · 16 Aug
76
Excellent
MOON 23%
02:00–03:00
Monday · 17 Aug
83
Excellent
MOON 32%
02:00–03:00
Tuesday · 18 Aug
75
Excellent
MOON 42%
02:00–03:00
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Nearby locations

About this forecast

Conditions for Sugar Hill, Georgia, 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 →