Clear Outside v1.0 - International Weather Forecasts For Astronomers

Saturday 27

First Quarter 52%

11:56

00:45

18 OK
19 OK
20 OK
21 Good
22 Good
23 OK
00 Good
01 OK
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

Sun - Rise: 07:42, Set: 16:27, Transit: 12:04. Moon - Rise: 11:56, Set: 00:45. Civil Dark: 17:01 - 07:08. Nautical Dark: 17:38 - 06:30. Astro Dark: 18:14 - 05:54

Total Clouds (% Sky Obscured)

29
23
19
6
4
14
9
12
64
74
95
96
78
69
58
100
100
100
100
100
100
100
100
100

Low Clouds (% Sky Obscured)

1
1
1
0
0
0
1
0
1
18
31
13
0
2
1
0
0
0
1
1
0
7
1
2

Medium Clouds (% Sky Obscured)

0
0
0
0
0
0
0
6
0
3
36
29
43
53
45
42
40
66
100
100
100
99
94
47

High Clouds (% Sky Obscured)

0
3
4
4
0
13
5
4
64
65
79
91
66
69
58
100
100
100
100
100
100
100
100
100

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
6
11
32
34
29
2
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)

2
1
0
2
1
2
2
2
2
1
2
2
1
2
3
2
3
3
4
6
5
5
5
4

Chance of Frost

Temperature (°C)

-12
-13
-14
-14
-15
-15
-15
-15
-15
-15
-15
-15
-15
-15
-15
-14
-11
-10
-8
-8
-7
-7
-7
-8

Feels Like (°C)

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

Dew Point (°C)

-14
-15
-15
-16
-17
-17
-17
-17
-17
-17
-17
-17
-17
-17
-17
-16
-14
-13
-12
-11
-10
-10
-9
-9

Relative Humidity (%)

85
86
86
84
84
86
84
86
84
84
86
86
86
86
86
83
80
77
77
79
79
80
85
88

Pressure (mb)

1025
1026
1026
1026
1025
1025
1025
1025
1025
1025
1024
1023
1023
1023
1022
1022
1021
1020
1018
1017
1016
1015
1014
1013

Ozone (du)

346
344
342
343
342
344
344
344
345
343
344
341
339
338
335
335
335
334
333
334
334
336
339
337

Sunday 28

Waxing Gibbous 63%

12:19

02:02

18 Bad
19 Bad
20 Bad
21 Bad
22 Bad
23 Bad
00 Bad
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

Sun - Rise: 07:42, Set: 16:28, Transit: 12:05. Moon - Rise: 12:19, Set: 02:02. Civil Dark: 17:02 - 07:08. Nautical Dark: 17:39 - 06:30. Astro Dark: 18:14 - 05:54

Total Clouds (% Sky Obscured)

100
100
100
100
100
100
100
100
100
100
100
100
100
100
100
100
100
100
99
97
85
92
100
98

Low Clouds (% Sky Obscured)

3
20
15
25
44
59
93
78
90
100
100
88
93
91
89
87
100
100
87
97
70
70
78
80

Medium Clouds (% Sky Obscured)

68
89
100
100
100
100
99
100
100
98
100
100
100
100
69
60
65
73
75
23
52
82
100
96

High Clouds (% Sky Obscured)

100
100
100
100
100
100
100
100
100
100
100
100
100
100
100
55
0
0
0
0
0
0
75
65

ISS Passover

Visibility (miles)

9
9
9
9
9
9
9
9
8
8
7
0
0
1
5
2
0
1
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
Snow
Frozen rai
Frozen rai
Frozen rai
Frozen rai
Frozen rai
Frozen rai
Frozen rai
Frozen rai
Frozen rai
Frozen rai
None
None
None
None
None
None

Precipitation Probability (%)

2
11
21
15
8
17
36
51
65
91
95
95
95
95
95
95
95
67
45
22
17
13
7
21

Precipitation Amount (mm)

0
0
0
0
0
0
0
0.1
0.3
0.4
1.5
1.9
0.9
1.6
2
2.6
0.9
0.4
0
0
0
0
0
0

Wind Speed/Direction (mph)

6
7
8
8
9
9
11
11
12
12
12
12
13
12
13
12
10
13
15
13
14
17
17
15

Chance of Frost

Temperature (°C)

-8
-7
-7
-7
-7
-7
-6
-6
-5
-5
-4
-4
-4
-3
-3
-3
-2
-1
-1
-1
-1
-0
-1
-2

Feels Like (°C)

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

Dew Point (°C)

-9
-9
-10
-9
-9
-9
-9
-8
-7
-6
-6
-5
-5
-4
-4
-3
-2
-1
-4
-4
-3
-3
-4
-4

Relative Humidity (%)

87
85
83
83
83
84
82
85
87
87
89
94
94
96
96
96
98
98
80
80
81
80
80
84

Pressure (mb)

1012
1011
1010
1008
1007
1005
1003
1001
999
998
996
994
992
990
990
988
987
986
986
985
985
985
985
985

Ozone (du)

336
334
335
333
332
331
330
331
326
326
324
326
328
336
344
349
350
355
365
384
403
413
413
411

Monday 29

Waxing Gibbous 74%

12:47

03:24

18 Bad
19 Bad
20 Bad
21 Bad
22 Bad
23 Bad
00 Bad
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

Sun - Rise: 07:42, Set: 16:29, Transit: 12:05. Moon - Rise: 12:47, Set: 03:24. Civil Dark: 17:03 - 07:08. Nautical Dark: 17:40 - 06:31. Astro Dark: 18:15 - 05:55

Total Clouds (% Sky Obscured)

100
95
97
100
99
100
100
100
100
97
99
96
100
100
99
100
97
98
98
99
99
100
98
96

Low Clouds (% Sky Obscured)

74
73
78
100
97
100
77
81
89
90
94
88
84
89
89
90
88
87
88
89
88
88
84
81

Medium Clouds (% Sky Obscured)

100
90
93
100
88
85
99
100
100
85
96
80
99
98
95
100
84
68
76
84
93
100
85
70

High Clouds (% Sky Obscured)

75
60
55
55
24
6
3
11
0
0
0
0
0
54
43
60
65
60
43
50
75
100
76
58

ISS Passover

Visibility (miles)

7
0
1
0
0
0
0
0
9
9
1
0
0
0
0
0
0
0
0
0
0
1
3
0

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
Snow
Snow
Snow
Snow
Snow
Snow
None
None
None
None
None
Snow
Snow
Snow
Snow
None
None
None
None
None
None
None
Snow

Precipitation Probability (%)

38
55
55
60
50
44
55
36
32
38
36
37
44
50
46
43
36
37
36
28
27
16
16
40

Precipitation Amount (mm)

0
0.2
0.2
0.3
0.2
0.1
0.3
0
0
0
0
0
0.1
0.2
0.1
0.2
0
0
0
0
0
0
0
0.1

Wind Speed/Direction (mph)

14
14
12
11
10
8
8
15
16
16
16
16
16
16
16
17
17
18
18
18
18
17
16
16

Chance of Frost

Temperature (°C)

-2
-2
-3
-3
-4
-5
-6
-8
-9
-10
-10
-11
-11
-11
-11
-11
-11
-11
-11
-11
-12
-12
-12
-13

Feels Like (°C)

-8
-8
-8
-8
-8
-8
-10
-14
-17
-17
-18
-18
-18
-18
-19
-19
-18
-18
-18
-19
-19
-19
-19
-20

Dew Point (°C)

-4
-3
-4
-5
-5
-6
-7
-9
-12
-13
-13
-13
-14
-13
-14
-14
-13
-13
-13
-14
-14
-15
-16
-16

Relative Humidity (%)

89
92
89
89
94
96
96
90
80
80
81
81
81
83
83
83
85
85
83
83
80
78
76
78

Pressure (mb)

985
984
984
983
983
983
984
985
986
987
988
989
990
990
991
992
993
994
994
995
996
996
997
998

Ozone (du)

418
430
427
412
401
396
393
388
385
385
388
401
402
413
433
431
430
425
425
432
435
438
443
441

Tuesday 30

Waxing Gibbous 84%

13:25

04:49

18 Bad
19 Bad
20 Bad
21 Bad
22 Bad
23 Bad
00 Bad
01 Bad
02 OK
03 OK
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

Sun - Rise: 07:42, Set: 16:30, Transit: 12:06. Moon - Rise: 13:25, Set: 04:49. Civil Dark: 17:03 - 07:08. Nautical Dark: 17:41 - 06:31. Astro Dark: 18:16 - 05:55

Total Clouds (% Sky Obscured)

93
93
95
97
95
93
76
51
35
40
63
81
99
99
100
100
100
100
100
100
100
96
100
69

Low Clouds (% Sky Obscured)

77
76
76
79
79
78
62
29
13
2
33
50
60
64
61
66
76
83
88
87
61
73
86
53

Medium Clouds (% Sky Obscured)

55
63
74
85
77
72
27
17
13
40
63
81
99
99
100
99
22
25
69
100
88
87
82
69

High Clouds (% Sky Obscured)

26
34
37
40
40
5
2
13
10
25
9
20
20
23
26
25
25
42
56
71
86
94
64
53

ISS Passover

Visibility (miles)

0
1
2
5
2
6
9
9
9
9
9
9
9
6
2
9
0
0
0
0
5
6
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
Snow
None
Snow
None
None
None
None

Precipitation Probability (%)

35
25
13
9
11
9
3
3
2
2
1
0
0
0
1
5
34
46
46
44
31
21
19
19

Precipitation Amount (mm)

0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0.1
0
0.1
0
0
0
0

Wind Speed/Direction (mph)

15
15
15
15
14
14
14
13
12
10
10
8
7
6
4
4
4
5
7
9
9
8
7
6

Chance of Frost

Temperature (°C)

-13
-13
-13
-13
-14
-14
-14
-14
-15
-15
-15
-15
-14
-14
-13
-13
-11
-10
-9
-8
-8
-8
-9
-10

Feels Like (°C)

-20
-20
-21
-21
-21
-21
-21
-20
-21
-20
-21
-20
-19
-18
-17
-17
-15
-14
-14
-14
-14
-15
-15
-16

Dew Point (°C)

-15
-16
-16
-17
-17
-17
-18
-19
-19
-20
-19
-19
-18
-17
-15
-14
-13
-11
-11
-10
-11
-11
-13
-14

Relative Humidity (%)

83
81
78
76
78
74
72
68
68
68
70
71
74
78
86
86
86
90
87
87
80
80
75
73

Pressure (mb)

999
999
1000
1000
1000
1001
1001
1001
1002
1002
1002
1002
1003
1003
1003
1003
1003
1002
1001
1001
1001
1001
1002
1002

Ozone (du)

442
441
437
426
421
417
416
416
409
399
392
385
384
381
381
382
381
389
391
396
405
410
410
411

Wednesday 31

Waxing Gibbous 92%

14:17

06:10

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

Sun - Rise: 07:42, Set: 16:31, Transit: 12:06. Moon - Rise: 14:17, Set: 06:10. Civil Dark: 17:04 - 07:08. Nautical Dark: 17:42 - 06:31. Astro Dark: 18:17 - 05:55

Total Clouds (% Sky Obscured)

66
75
77
72
81
63
61
53
64
42
32
31
4
8
12
21
32
44
62
55
45
32
20
9

Low Clouds (% Sky Obscured)

59
69
67
64
47
23
2
0
3
1
0
2
0
0
0
0
0
0
0
0
0
0
0
0

Medium Clouds (% Sky Obscured)

55
50
47
37
30
25
25
29
29
28
19
9
0
0
0
0
0
0
0
0
0
0
0
0

High Clouds (% Sky Obscured)

49
43
36
32
26
13
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 (%)

18
18
19
19
16
11
1
1
1
0
0
0
0
0
0
0
0
0
0
0
0
0
1
2

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
7
7
5
5
4
4
4
3
3
3
3
3
3
3
4
5
6
5
3
2
2

Chance of Frost

Temperature (°C)

-11
-12
-12
-13
-14
-16
-17
-17
-18
-19
-20
-21
-22
-23
-21
-19
-17
-16
-15
-14
-14
-14
-14
-15

Feels Like (°C)

-16
-16
-17
-17
-17
-19
-19
-20
-21
-22
-22
-23
-25
-25
-25
-25
-25
-24
-23
-23
-17
-17
-17
-16

Dew Point (°C)

-15
-15
-15
-16
-17
-18
-19
-20
-21
-22
-23
-24
-25
-26
-24
-22
-21
-20
-19
-18
-18
-17
-17
-18

Relative Humidity (%)

73
76
78
78
81
82
82
81
80
80
77
78
77
76
74
74
73
71
70
69
72
76
79
80

Pressure (mb)

1003
1004
1004
1005
1006
1007
1007
1007
1008
1008
1008
1009
1009
1009
1010
1010
1010
1010
1009
1009
1009
1008
1008
1009

Ozone (du)

411
414
414
418
415
398
396
392
390
388
387
381
377
378
379
379
380
387
394
400
404
407
411
408

Thursday 1

Waxing Gibbous 98%

15:24

07:22

18 OK
19 OK
20 OK
21 OK
22 OK
23 Bad
00 Bad
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

Sun - Rise: 07:42, Set: 16:32, Transit: 12:07. Moon - Rise: 15:24, Set: 07:22. Civil Dark: 17:05 - 07:08. Nautical Dark: 17:43 - 06:31. Astro Dark: 18:18 - 05:55

Total Clouds (% Sky Obscured)

3
2
1
1
25
50
74
76
79
86
91
95
98
91
83
76
83
90
98
96
98
100
100
99

Low Clouds (% Sky Obscured)

0
0
0
0
14
28
41
49
59
69
75
78
85
74
63
51
43
34
25
46
66
87
88
90

Medium Clouds (% Sky Obscured)

0
0
0
0
19
36
54
50
45
42
56
72
89
64
38
12
17
24
30
50
69
90
81
75

High Clouds (% Sky Obscured)

0
0
0
0
0
0
0
11
27
19
17
13
10
13
12
4
4
4
3
4
4
3
6
8

ISS Passover

Visibility (miles)

9
9
9
9
9
9
9
9
6
3
1
1
0
0
1
3
4
5
7
8
8
7
7
5

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
1
1
0
0
0
0
2
4
4
15
21
26
21
17
13
11
8
0
1
1
1
16
23

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
3
3
3
3
2
2
2
2
2
2
2
2
2
2
3
3
2
2
3
3
3
3
3

Chance of Frost

Temperature (°C)

-16
-18
-19
-19
-20
-20
-20
-20
-20
-19
-19
-19
-18
-18
-17
-16
-15
-14
-13
-11
-11
-11
-11
-11

Feels Like (°C)

-16
-15
-20
-21
-21
-22
-22
-21
-23
-24
-24
-25
-25
-25
-21
-20
-20
-19
-19
-18
-14
-15
-15
-15

Dew Point (°C)

-19
-20
-21
-22
-23
-23
-23
-23
-22
-22
-21
-21
-20
-20
-19
-18
-17
-16
-15
-14
-13
-13
-12
-12

Relative Humidity (%)

80
79
79
79
79
78
78
78
81
81
80
82
83
85
85
85
84
83
81
81
83
85
88
88

Pressure (mb)

1009
1009
1009
1009
1009
1008
1008
1008
1008
1008
1008
1008
1008
1008
1008
1008
1008
1008
1007
1006
1006
1006
1005
1005

Ozone (du)

405
402
392
381
371
364
358
351
350
348
347
350
352
355
356
356
357
364
371
378
388
397
406
415

Friday 2

Waxing Gibbous 100%

16:42

08:19

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

Sun - Rise: 07:42, Set: 16:33, Transit: 12:07. Moon - Rise: 16:42, Set: 08:19. Civil Dark: 17:06 - 07:08. Nautical Dark: 17:43 - 06:31. Astro Dark: 18:18 - 05:55

Total Clouds (% Sky Obscured)

99
97
95
93
92
90
84
81
75
72
43
26
20
18
16
8
11
11
12

Low Clouds (% Sky Obscured)

92
74
58
40
40
44
44
34
30
25
15
7
4
5
4
2
11
11
12

Medium Clouds (% Sky Obscured)

71
69
69
72
61
46
34
23
12
2
1
0
0
0
0
0
0
0
0

High Clouds (% Sky Obscured)

20
44
31
2
2
1
0
0
0
0
0
0
0
0
0
0
0
0
0

ISS Passover

Visibility (miles)

2
0
1
1
2
2
2
2
4
7
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

Precipitation Type

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

Precipitation Probability (%)

29
30
29
31
25
20
14
11
8
1
2
1
0
1
1
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

Wind Speed/Direction (mph)

3
3
3
3
4
3
4
5
5
5
6
6
5
5
5
5
5
6
7

Chance of Frost

Temperature (°C)

-11
-11
-11
-11
-11
-12
-12
-13
-13
-14
-14
-16
-18
-19
-18
-16
-15
-14
-13

Feels Like (°C)

-14
-14
-15
-15
-15
-15
-15
-14
-17
-17
-17
-18
-18
-18
-22
-22
-21
-20
-20

Dew Point (°C)

-12
-12
-12
-12
-12
-13
-14
-14
-15
-15
-16
-18
-20
-22
-21
-19
-18
-17
-17

Relative Humidity (%)

90
90
90
90
92
92
90
90
88
86
86
83
82
81
78
76
76
74
73

Pressure (mb)

1005
1005
1005
1005
1005
1006
1006
1006
1007
1008
1009
1010
1011
1012
1012
1013
1014
1013
1013

Ozone (du)

423
432
428
423
418
419
420
420
412
403
395
384
373
361
361
360
359
355
350

Forecast for ByWard Market, Ottawa, Canada (45.42,-75.69)

Generated: 27/12/25 18:09:45. Forecast: 27/12/25 to 02/01/26. Timezone: UTC-5.00