Clear Outside v1.0 - International Weather Forecasts For Astronomers

Thursday 25

Waxing Crescent 28%

11:45

22:36

01 Good
02 Good
03 Good
04 OK
05 Good
06 OK
07 OK
08 OK
09 Good
10 Good
11 Good
12 Good
13 Good
14 Good
15 Good
16 Good
17 Good
18 Good
19 Good
20 Good
21 Good
22 Good
23 Good
00 Good

Sun - Rise: 08:44, Set: 16:41, Transit: 12:42. Moon - Rise: 11:45, Set: 22:36. Civil Dark: 17:20 - 08:05. Nautical Dark: 18:03 - 07:22. Astro Dark: 18:43 - 06:42

Total Clouds (% Sky Obscured)

10
13
11
18
11
14
18
18
10
13
5
0
0
0
0
0
0
0
0
0
0
0
0
0

Low Clouds (% Sky Obscured)

10
13
11
18
11
14
18
16
8
11
5
0
0
0
0
0
0
0
0
0
0
0
0
0

Medium Clouds (% Sky Obscured)

0
0
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0

High Clouds (% Sky Obscured)

0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0

ISS Passover

Visibility (miles)

9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9

Fog (%)

0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0

Precipitation Type

None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None

Precipitation Probability (%)

0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0

Precipitation Amount (mm)

0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0

Wind Speed/Direction (mph)

18
18
18
19
18
18
17
16
16
16
15
15
15
14
13
13
13
13
12
11
10
10
10
10

Chance of Frost

Temperature (°C)

-3
-3
-3
-3
-4
-4
-4
-4
-4
-4
-4
-3
-2
-1
-1
-1
-1
-2
-2
-2
-3
-3
-3
-3

Feels Like (°C)

-9
-10
-10
-11
-10
-11
-10
-10
-11
-10
-9
-8
-7
-6
-6
-5
-6
-7
-7
-6
-6
-7
-7
-7

Dew Point (°C)

-13
-14
-15
-16
-17
-17
-17
-17
-17
-17
-17
-16
-14
-14
-13
-12
-13
-13
-13
-13
-12
-12
-12
-12

Relative Humidity (%)

44
40
38
35
35
34
34
34
35
34
35
35
37
38
38
41
42
42
44
45
47
47
47
49

Pressure (mb)

1027
1027
1027
1027
1026
1027
1027
1027
1028
1028
1028
1027
1027
1027
1026
1026
1026
1026
1027
1027
1027
1027
1027
1027

Ozone (du)

375
373
368
364
363
362
365
367
368
367
365
364
363
365
368
368
366
363
359
355
351
348
349
349

Friday 26

Waxing Crescent 38%

11:58

23:53

01 Good
02 Good
03 Good
04 Good
05 Good
06 Good
07 Good
08 Good
09 Good
10 Good
11 Good
12 Good
13 Good
14 Good
15 Good
16 Good
17 Good
18 Good
19 Good
20 OK
21 Bad
22 OK
23 Bad
00 Bad

Sun - Rise: 08:44, Set: 16:42, Transit: 12:43. Moon - Rise: 11:58, Set: 23:53. Civil Dark: 17:21 - 08:05. Nautical Dark: 18:04 - 07:22. Astro Dark: 18:44 - 06:42

Total Clouds (% Sky Obscured)

0
0
0
0
0
0
0
0
0
0
0
0
1
1
1
0
0
0
0
25
72
40
90
69

Low Clouds (% Sky Obscured)

0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0

Medium Clouds (% Sky Obscured)

0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
0
0
0

High Clouds (% Sky Obscured)

0
0
0
0
0
0
0
0
0
0
0
0
1
1
1
0
0
0
0
24
71
39
90
69

ISS Passover

Visibility (miles)

9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9

Fog (%)

0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0

Precipitation Type

None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None

Precipitation Probability (%)

0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0

Precipitation Amount (mm)

0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0

Wind Speed/Direction (mph)

9
10
10
11
10
10
9
9
9
8
9
9
9
9
8
8
8
9
9
8
9
8
8
9

Chance of Frost

Temperature (°C)

-3
-3
-3
-3
-3
-3
-3
-3
-3
-2
-1
-0
1
2
2
1
1
0
0
-0
-1
-1
-1
-1

Feels Like (°C)

-7
-7
-7
-7
-7
-7
-6
-6
-6
-5
-4
-3
-2
-2
-1
-2
-3
-4
-5
-4
-4
-4
-4
-3

Dew Point (°C)

-12
-11
-11
-11
-11
-10
-10
-9
-9
-8
-8
-7
-6
-6
-5
-5
-4
-5
-5
-5
-5
-5
-5
-5

Relative Humidity (%)

51
53
56
56
57
58
60
62
64
63
61
59
59
58
62
65
69
70
71
71
71
71
71
71

Pressure (mb)

1027
1027
1027
1027
1026
1026
1026
1027
1027
1028
1028
1028
1028
1028
1028
1028
1028
1029
1029
1030
1030
1030
1030
1031

Ozone (du)

347
342
340
339
335
332
331
330
326
324
321
321
319
317
315
313
310
308
308
308
309
309
309
308

Saturday 27

First Quarter 49%

12:10

No Set

01 Bad
02 Good
03 Good
04 Good
05 Good
06 Good
07 Good
08 Good
09 Good
10 Good
11 Good
12 Good
13 Good
14 Good
15 Good
16 Good
17 Good
18 OK
19 Bad
20 Bad
21 Bad
22 Bad
23 Bad
00 Bad

Sun - Rise: 08:44, Set: 16:43, Transit: 12:43. Moon - Rise: 12:10, Set: No Set. Civil Dark: 17:22 - 08:05. Nautical Dark: 18:04 - 07:23. Astro Dark: 18:44 - 06:42

Total Clouds (% Sky Obscured)

65
0
5
0
0
0
0
0
2
4
3
4
3
2
3
2
16
19
57
75
69
73
76
76

Low Clouds (% Sky Obscured)

0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
7
10
48
70
69
73
76
76

Medium Clouds (% Sky Obscured)

0
0
3
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0

High Clouds (% Sky Obscured)

65
0
0
0
0
0
0
0
1
1
2
2
2
1
1
0
0
0
0
4
1
1
1
1

ISS Passover

Visibility (miles)

9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9

Fog (%)

0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0

Precipitation Type

None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None

Precipitation Probability (%)

0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0

Precipitation Amount (mm)

0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0

Wind Speed/Direction (mph)

9
9
10
9
9
9
8
8
9
9
9
10
10
9
8
8
8
7
8
7
7
8
8
8

Chance of Frost

Temperature (°C)

-1
-1
-1
-1
-1
-1
-1
-1
-1
-1
0
1
2
3
3
2
1
1
1
1
1
1
1
1

Feels Like (°C)

-4
-4
-5
-4
-5
-4
-5
-5
-5
-5
-3
-2
-1
0
0
-1
-1
-1
-2
-2
-2
-1
-1
-1

Dew Point (°C)

-6
-7
-9
-11
-12
-13
-13
-13
-12
-11
-10
-8
-7
-6
-5
-3
-1
0
0
0
0
0
1
1

Relative Humidity (%)

67
61
53
46
42
38
38
39
42
44
46
49
51
53
58
70
86
94
96
94
93
93
94
94

Pressure (mb)

1031
1031
1031
1031
1031
1031
1031
1031
1032
1032
1032
1032
1032
1031
1031
1032
1032
1032
1033
1033
1033
1033
1033
1033

Ozone (du)

306
306
305
303
303
302
301
302
301
302
302
301
301
301
300
299
298
298
299
299
297
297
297
298

Sunday 28

Waxing Gibbous 61%

12:24

01:13

01 Bad
02 Bad
03 Bad
04 Bad
05 Bad
06 Bad
07 Bad
08 Bad
09 Bad
10 Bad
11 Bad
12 Bad
13 Bad
14 Bad
15 Bad
16 Bad
17 Bad
18 Bad
19 Bad
20 OK
21 OK
22 OK
23 OK
00 OK

Sun - Rise: 08:44, Set: 16:44, Transit: 12:44. Moon - Rise: 12:24, Set: 01:13. Civil Dark: 17:23 - 08:05. Nautical Dark: 18:05 - 07:23. Astro Dark: 18:45 - 06:43

Total Clouds (% Sky Obscured)

87
82
78
83
95
98
99
75
75
73
73
72
70
74
72
64
59
51
50
46
41
44
48
48

Low Clouds (% Sky Obscured)

86
82
78
83
95
98
98
75
75
73
73
72
70
74
72
64
59
51
50
43
39
44
48
48

Medium Clouds (% Sky Obscured)

0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0

High Clouds (% Sky Obscured)

1
1
1
1
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0

ISS Passover

Visibility (miles)

9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9

Fog (%)

0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0

Precipitation Type

None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None

Precipitation Probability (%)

0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0

Precipitation Amount (mm)

0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0

Wind Speed/Direction (mph)

7
7
7
7
7
7
7
6
6
7
8
8
8
8
7
7
7
7
7
7
6
6
6
6

Chance of Frost

Temperature (°C)

1
1
1
1
1
1
1
1
1
1
2
2
3
3
3
3
2
1
1
1
0
0
-0
-0

Feels Like (°C)

-1
-1
-1
-1
-1
-3
-2
-2
-1
-0
-0
-1
0
0
1
1
-0
-1
-2
-2
-2
-3
-3
-3

Dew Point (°C)

0
0
0
0
0
0
0
-0
0
-0
-1
-2
-2
-3
-3
-2
-3
-3
-4
-5
-5
-6
-7
-7

Relative Humidity (%)

94
94
94
94
93
93
93
89
94
91
84
77
72
65
68
70
73
71
69
69
66
63
61
60

Pressure (mb)

1033
1032
1032
1032
1032
1032
1032
1032
1032
1033
1032
1032
1032
1031
1031
1031
1031
1031
1031
1031
1031
1031
1031
1031

Ozone (du)

299
298
298
298
297
295
293
293
295
297
297
296
295
294
292
289
289
288
288
289
290
291
289
287

Monday 29

Waxing Gibbous 72%

12:39

02:36

01 OK
02 OK
03 OK
04 OK
05 OK
06 OK
07 OK
08 Bad
09 Bad
10 Bad
11 Bad
12 Bad
13 Bad
14 Bad
15 Bad
16 Bad
17 Bad
18 Bad
19 Bad
20 Bad
21 Bad
22 Bad
23 Bad
00 Bad

Sun - Rise: 08:44, Set: 16:44, Transit: 12:44. Moon - Rise: 12:39, Set: 02:36. Civil Dark: 17:24 - 08:05. Nautical Dark: 18:06 - 07:23. Astro Dark: 18:46 - 06:43

Total Clouds (% Sky Obscured)

43
41
45
41
38
29
43
54
66
60
59
59
56
58
59
61
67
71
73
76
80
79
80
84

Low Clouds (% Sky Obscured)

43
41
45
41
34
26
36
46
56
60
59
59
56
58
59
61
67
71
73
70
67
72
79
84

Medium Clouds (% Sky Obscured)

0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0

High Clouds (% Sky Obscured)

0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0

ISS Passover

Visibility (miles)

9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9

Fog (%)

0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0

Precipitation Type

None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None

Precipitation Probability (%)

0
0
0
0
0
0
0
0
0
0
1
1
4
4
1
4
5
4
10
14
15
15
12
1

Precipitation Amount (mm)

0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0

Wind Speed/Direction (mph)

6
6
6
5
5
4
4
3
3
2
2
2
3
3
3
3
4
5
6
5
5
5
4
4

Chance of Frost

Temperature (°C)

-1
-1
-1
-1
-1
-1
-1
-0
0
1
2
3
4
4
4
3
4
4
4
4
4
4
4
4

Feels Like (°C)

-3
-2
-2
-2
-2
-2
-2
-2
-1
0
1
3
3
4
4
3
4
3
3
2
2
1
1
1

Dew Point (°C)

-8
-8
-8
-8
-7
-7
-6
-4
-3
-2
-1
-0
1
1
1
2
2
2
1
1
1
1
1
1

Relative Humidity (%)

59
59
57
57
60
63
68
77
83
81
80
79
79
82
85
89
88
83
80
79
80
79
79
79

Pressure (mb)

1030
1030
1030
1030
1030
1029
1029
1029
1029
1029
1029
1029
1028
1028
1028
1027
1027
1027
1027
1028
1028
1028
1028
1028

Ozone (du)

285
284
283
283
286
290
290
290
289
289
289
288
287
287
287
286
288
291
293
293
293
293
293
292

Tuesday 30

Waxing Gibbous 82%

13:00

04:04

01 Bad
02 Bad
03 Bad
04 Bad
05 Bad
06 OK
07 Bad
08 Bad
09 Bad
10 Bad
11 Bad
12 Bad
13 Bad
14 Bad
15 Bad
16 Bad
17 Bad
18 Bad
19 Bad
20 Bad
21 Bad
22 Bad
23 Bad
00 Bad

Sun - Rise: 08:44, Set: 16:45, Transit: 12:45. Moon - Rise: 13:00, Set: 04:04. Civil Dark: 17:24 - 08:05. Nautical Dark: 18:07 - 07:23. Astro Dark: 18:47 - 06:43

Total Clouds (% Sky Obscured)

81
79
77
58
39
21
27
39
55
59
68
78
83
89
93
92
91
89
79
72
60
70
82
91

Low Clouds (% Sky Obscured)

81
79
76
57
38
20
25
29
32
39
52
69
77
85
90
91
91
88
79
67
54
59
74
87

Medium Clouds (% Sky Obscured)

0
0
0
0
0
0
2
4
6
7
11
8
8
8
8
7
6
5
2
1
0
0
0
0

High Clouds (% Sky Obscured)

0
0
0
1
3
3
3
3
2
0
0
0
0
0
0
0
0
0
0
0
0
1
0
1

ISS Passover

Visibility (miles)

9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9

Fog (%)

0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0

Precipitation Type

None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None

Precipitation Probability (%)

4
7
9
13
16
20
18
17
13
12
10
1
5
8
9
11
11
9
10
10
10
12
13
14

Precipitation Amount (mm)

0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0

Wind Speed/Direction (mph)

3
4
4
6
5
5
5
4
4
3
3
4
4
5
5
5
5
4
4
3
3
4
4
4

Chance of Frost

Temperature (°C)

4
4
4
3
3
3
2
2
3
3
3
4
4
5
5
5
5
4
4
4
3
3
3
3

Feels Like (°C)

1
1
2
2
2
2
2
1
1
1
1
1
1
2
2
3
2
2
2
1
1
0
-0
-0

Dew Point (°C)

1
1
2
2
2
1
1
0
0
-0
-0
0
0
1
1
1
1
1
1
0
-0
-1
-1
-1

Relative Humidity (%)

76
82
88
93
91
89
89
86
83
82
79
77
75
75
75
76
78
77
79
77
77
77
77
79

Pressure (mb)

1028
1028
1029
1029
1029
1029
1029
1029
1030
1030
1030
1030
1030
1030
1029
1029
1029
1029
1029
1029
1029
1029
1028
1028

Ozone (du)

292
291
289
288
287
285
283
283
283
283
287
291
294
307
319
332
331
331
330
332
333
334
337
340

Wednesday 31

Waxing Gibbous 91%

13:28

05:35

Sun - Rise: 08:44, Set: 16:46, Transit: 12:45. Moon - Rise: 13:28, Set: 05:35. Civil Dark: 17:25 - 08:05. Nautical Dark: 18:08 - 07:23. Astro Dark: 18:48 - 06:43

Total Clouds (% Sky Obscured)

Low Clouds (% Sky Obscured)

Medium Clouds (% Sky Obscured)

High Clouds (% Sky Obscured)

ISS Passover

Visibility (miles)

Fog (%)

Precipitation Type

Precipitation Probability (%)

Precipitation Amount (mm)

Wind Speed/Direction (mph)

Chance of Frost

Temperature (°C)

Feels Like (°C)

Dew Point (°C)

Relative Humidity (%)

Pressure (mb)

Ozone (du)

Forecast for Brussels, Bruxelles-Capitale, Kingdom of Belgium (50.85,4.35)

Generated: 25/12/25 00:51:09. Forecast: 25/12/25 to 31/12/25. Timezone: UTC+1.00