Tromsø
69.649° N
18.955° E
0
/100
PEAK
PEAK
Cloud will spoil it. Not a night for the telescope.
NO USABLE WINDOW · NO ASTRO DARK · MOON 0%
Transparency
0.00
Seeing
0.00
Cloud
100%
Moon
0%
At this latitude the sun never drops 18° below the horizon tonight, so
astronomical darkness never arrives. Scores reflect the deepest twilight available.
Clouded out tonight
Hour by hour, local to Tromsø. Colour encodes the score and nothing else; every other measurement is luminance.
Sky state
Lighter = daylight and twilight ·
unshaded = astronomical dark
Score
18
19
20
21
22
23
00
01
02
03
04
05
06
07
08
09
10
11
12
Low cloud
97%
98%
100%
98%
94%
95%
96%
92%
97%
95%
94%
81%
68%
54%
54%
26%
44%
62%
47%
Mid cloud
99%
94%
95%
89%
58%
33%
32%
35%
52%
66%
39%
18%
17%
27%
45%
17%
28%
28%
52%
High cloud
14%
22%
15%
6%
0%
0%
2%
7%
12%
16%
4%
2%
0%
0%
0%
0%
0%
0%
0%
Transparency
0.10
0.10
0.10
0.10
0.10
0.27
0.30
0.10
0.10
0.10
0.10
0.33
0.34
0.40
0.46
0.52
0.56
0.57
0.58
Seeing
0.89
0.74
0.76
0.66
0.86
0.68
0.66
0.66
0.65
0.67
0.56
0.71
0.70
0.69
0.72
0.72
0.71
0.75
0.82
Moon clear
0%
0%
0%
0%
0%
down
down
down
down
down
down
0%
0%
0%
0%
1%
1%
1%
1%
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
18
Clouded out · 0/100
Starting from
100
Cloud
−100
Transparency
−0
Seeing
−0
Moonlight
−0
Darkness
−0
Score
0
CLOUD 100%
LOW 97%
MID 99%
HIGH 14%
SUN 18.3°
MOON 19.7° / 0%
WIND 3
TEMP 9°
19
Clouded out · 0/100
Starting from
100
Cloud
−100
Transparency
−0
Seeing
−0
Moonlight
−0
Darkness
−0
Score
0
CLOUD 100%
LOW 98%
MID 94%
HIGH 22%
SUN 13.1°
MOON 14.5° / 0%
WIND 5
TEMP 8°
20
Clouded out · 0/100
Starting from
100
Cloud
−100
Transparency
−0
Seeing
−0
Moonlight
−0
Darkness
−0
Score
0
CLOUD 100%
LOW 100%
MID 95%
HIGH 15%
SUN 8.1°
MOON 9.4° / 0%
WIND 4
TEMP 8°
21
Clouded out · 0/100
Starting from
100
Cloud
−100
Transparency
−0
Seeing
−0
Moonlight
−0
Darkness
−0
Score
0
CLOUD 100%
LOW 98%
MID 89%
HIGH 6%
SUN 3.5°
MOON 4.8° / 0%
WIND 5
TEMP 8°
22
Clouded out · 0/100
Starting from
100
Cloud
−97
Transparency
−1
Seeing
−0
Moonlight
−0
Darkness
−2
Score
0
CLOUD 96%
LOW 94%
MID 58%
HIGH 0%
SUN -0.4°
MOON 1.0° / 0%
WIND 3
TEMP 8°
23
Clouded out · 0/100
Starting from
100
Cloud
−97
Transparency
−1
Seeing
−0
Moonlight
−0
Darkness
−2
Score
0
CLOUD 96%
LOW 95%
MID 33%
HIGH 0%
SUN -3.3°
MOON -2.0° / 0%
WIND 5
TEMP 9°
00
Clouded out · 0/100
Starting from
100
Cloud
−97
Transparency
−1
Seeing
−0
Moonlight
−0
Darkness
−2
Score
0
CLOUD 97%
LOW 96%
MID 32%
HIGH 2%
SUN -5.0°
MOON -4.8° / 0%
WIND 5
TEMP 9°
01
Clouded out · 0/100
Starting from
100
Cloud
−95
Transparency
−2
Seeing
−0
Moonlight
−0
Darkness
−3
Score
0
CLOUD 94%
LOW 92%
MID 35%
HIGH 7%
SUN -5.5°
MOON -5.9° / 0%
WIND 5
TEMP 9°
02
Clouded out · 0/100
Starting from
100
Cloud
−99
Transparency
−1
Seeing
−0
Moonlight
−0
Darkness
−1
Score
0
CLOUD 98%
LOW 97%
MID 52%
HIGH 12%
SUN -4.6°
MOON -5.6° / 0%
WIND 6
TEMP 9°
03
Clouded out · 0/100
Starting from
100
Cloud
−98
Transparency
−1
Seeing
−0
Moonlight
−0
Darkness
−1
Score
0
CLOUD 97%
LOW 95%
MID 66%
HIGH 16%
SUN -2.4°
MOON -4.0° / 0%
WIND 5
TEMP 9°
04
Clouded out · 0/100
Starting from
100
Cloud
−96
Transparency
−1
Seeing
−0
Moonlight
−0
Darkness
−2
Score
0
CLOUD 96%
LOW 94%
MID 39%
HIGH 4%
SUN 0.8°
MOON -0.9° / 0%
WIND 6
TEMP 9°
05
Clouded out · 0/100
Starting from
100
Cloud
−84
Transparency
−4
Seeing
−1
Moonlight
−0
Darkness
−11
Score
0
CLOUD 85%
LOW 81%
MID 18%
HIGH 2%
SUN 4.9°
MOON 2.1° / 0%
WIND 5
TEMP 8°
06
Clouded out · 0/100
Starting from
100
Cloud
−73
Transparency
−7
Seeing
−1
Moonlight
−0
Darkness
−18
Score
0
CLOUD 74%
LOW 68%
MID 17%
HIGH 0%
SUN 9.7°
MOON 6.1° / 0%
WIND 5
TEMP 9°
07
Clouded out · 0/100
Starting from
100
Cloud
−65
Transparency
−8
Seeing
−2
Moonlight
−0
Darkness
−24
Score
0
CLOUD 64%
LOW 54%
MID 27%
HIGH 0%
SUN 14.8°
MOON 10.6° / 0%
WIND 5
TEMP 9°
08
Clouded out · 0/100
Starting from
100
Cloud
−73
Transparency
−6
Seeing
−1
Moonlight
−0
Darkness
−20
Score
0
CLOUD 73%
LOW 54%
MID 45%
HIGH 0%
SUN 20.0°
MOON 15.4° / 0%
WIND 5
TEMP 9°
09
Clouded out · 0/100
Starting from
100
Cloud
−37
Transparency
−12
Seeing
−4
Moonlight
−0
Darkness
−47
Score
0
CLOUD 38%
LOW 26%
MID 17%
HIGH 0%
SUN 24.9°
MOON 20.1° / 1%
WIND 5
TEMP 10°
10
Clouded out · 0/100
Starting from
100
Cloud
−58
Transparency
−7
Seeing
−3
Moonlight
−0
Darkness
−32
Score
0
CLOUD 56%
LOW 44%
MID 28%
HIGH 0%
SUN 29.2°
MOON 24.4° / 1%
WIND 5
TEMP 10°
11
Clouded out · 0/100
Starting from
100
Cloud
−72
Transparency
−5
Seeing
−1
Moonlight
−0
Darkness
−22
Score
0
CLOUD 69%
LOW 62%
MID 28%
HIGH 0%
SUN 32.5°
MOON 27.9° / 1%
WIND 5
TEMP 11°
12
Clouded out · 0/100
Starting from
100
Cloud
−72
Transparency
−5
Seeing
−1
Moonlight
−0
Darkness
−22
Score
0
CLOUD 71%
LOW 47%
MID 52%
HIGH 0%
SUN 34.5°
MOON 30.5° / 1%
WIND 4
TEMP 12°
Excellent 75+
Good 55+
Fair 35+
Poor 15+
Not worth it
Seeing is estimated from surface wind — see
how we score.
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The next week of nights
Tonight · 12 Aug
0
Clouded out
MOON 0%
Tomorrow · 13 Aug
0
Clouded out
MOON 2%
Friday · 14 Aug
0
Clouded out
MOON 6%
Saturday · 15 Aug
0
Clouded out
MOON 13%
Sunday · 16 Aug
0
Clouded out
MOON 21%
Monday · 17 Aug
0
Clouded out
MOON 30%
Tuesday · 18 Aug
0
Clouded out
MOON 39%
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About this forecast
Conditions for Tromsø, Norway 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 →