GoodSeeing
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Cheltenham

-37.969° S   145.048° E  ·  41 M
52 /100
PEAK
Marginal, but there is a 2 hours gap from 03:00.
BEST WINDOW 03:00–05:00 · ASTRO DARK 03:00–06:00 · MOON 0%
Transparency
0.44
Seeing
0.43
Cloud
16%
Moon
0%

Fair tonight

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

Sky state
Lighter = daylight and twilight  ·  unshaded = astronomical dark
Score
03
04
05
06
07
52
48
30
2
0
BEST WINDOW
Low cloud
16%
24%
52%
90%
100%
Mid cloud
3%
1%
7%
55%
9%
High cloud
0%
0%
0%
0%
0%
Transparency
0.41
0.40
0.42
0.44
0.45
Seeing
0.30
0.35
0.43
0.34
0.32
Moon clear
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
03 Fair · 52/100
Starting from
100
Cloud
−18
Transparency
−19
Seeing
−11
Moonlight
−0
Darkness
−0
Score
52
CLOUD 16% LOW 16% MID 3% HIGH 0% SUN -48.9° MOON -50.4° / 0% WIND 9 TEMP 12°
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 56

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

030507
CLOUD RETURNS 05:00
SET UP 02:30 · OBSERVE 03:00–05:00 · 2H · MEAN 47

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

030507
CLOUD RETURNS 05:00SEEING STAYS SOFT THROUGHOUTMOONLIGHT IGNORED FOR THIS TARGET
SET UP 02:30 · OBSERVE 03:00–05:00 · 2H · MEAN 55

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

030507
CLOUD RETURNS 05:00
SET UP 02:30 · OBSERVE 03:00–05:00 · 2H · MEAN 43

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

030507
CLOUD RETURNS 05:00
SET UP 02:30 · OBSERVE 03:00–05:00 · 2H · MEAN 61

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

030507
CLOUD RETURNS 05:00
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The next week of nights

Tonight · 12 Aug
52
Fair
MOON 0%
03:00–05:00
Tomorrow · 13 Aug
67
Good
MOON 1%
20:00–06:00
Friday · 14 Aug
62
Good
MOON 5%
23:00–05:00
Saturday · 15 Aug
68
Good
MOON 8%
22:00–23:00
Sunday · 16 Aug
72
Good
MOON 19%
22:00–23:00
Monday · 17 Aug
64
Good
MOON 28%
22:00–23:00
Tuesday · 18 Aug
41
Fair
MOON 37%
22:00–23:00
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Nearby locations

About this forecast

Conditions for Cheltenham, Victoria, Australia 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 →