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Whitehorse

60.716° N   135.054° W  ·  630 M
47 /100
PEAK
Nothing usable opens up tonight.
NO USABLE WINDOW · NO ASTRO DARK · MOON 1%
Transparency
0.70
Seeing
1.00
Cloud
5%
Moon
1%
At this latitude the sun never drops 18° below the horizon tonight, so astronomical darkness never arrives. Scores reflect the deepest twilight available.

Fair tonight

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

Sky state
Lighter = daylight and twilight  ·  unshaded = astronomical dark
Score
23
00
01
02
03
04
05
06
0
30
47
43
38
27
5
0
Low cloud
1%
2%
2%
1%
1%
0%
0%
0%
Mid cloud
5%
5%
9%
7%
2%
1%
1%
2%
High cloud
0%
0%
3%
38%
45%
36%
20%
6%
Transparency
0.77
0.70
0.64
0.57
0.51
0.47
0.46
0.45
Seeing
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
Moon clear
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
23 Clouded out · 0/100
Starting from
100
Cloud
−5
Transparency
−9
Seeing
−0
Moonlight
−0
Darkness
−86
Score
0
CLOUD 5% LOW 1% MID 5% HIGH 0% SUN -5.9° MOON -4.9° / 0% WIND 1 TEMP 16°
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
Civil, nautical and astronomical twilight

Astronomical darkness begins when the sun is 18° below the horizon. Above that, there is still measurable skyglow, and faint deep-sky work is compromised even though the sky looks black.

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 01:00–03:00 · 2H · MEAN 36

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

23010305
TWILIGHT BEGINS 03:00
SET UP 23:30 · OBSERVE 00:00–06:00 · 6H · MEAN 60

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

23010305
TWILIGHT BEGINS 06:00MOONLIGHT IGNORED FOR THIS TARGET
SET UP 00:30 · OBSERVE 01:00–03:00 · 2H · MEAN 38

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

23010305
TWILIGHT BEGINS 03:00
SET UP 00:30 · OBSERVE 01:00–02:00 · 1H · MEAN 35

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

23010305
CLOUD RETURNS 02:00
SET UP 00:30 · OBSERVE 01:00–03:00 · 2H · MEAN 37

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

23010305
TWILIGHT BEGINS 03:00
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The next week of nights

Tonight · 12 Aug
47
Fair
MOON 1%
Tomorrow · 13 Aug
66
Good
MOON 3%
Friday · 14 Aug
9
Clouded out
MOON 7%
Saturday · 15 Aug
10
Clouded out
MOON 17%
Sunday · 16 Aug
10
Clouded out
MOON 25%
Monday · 17 Aug
13
Clouded out
MOON 35%
Tuesday · 18 Aug
15
Poor
MOON 44%
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About this forecast

Conditions for Whitehorse, Yukon, Canada 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 →