Clear Outside v1.0 - International Weather Forecasts For Astronomers

Monday 27

Waxing Gibbous 86%

16:27

05:00

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
01 Bad
02 Bad
03 Bad
04 Bad
05 Bad
06 Bad
07 Bad
08 Bad

Sun - Rise: 06:16, Set: 21:00, Transit: 13:39. Moon - Rise: 16:27, Set: 05:00. Civil Dark: 21:39 - 05:37. Nautical Dark: 22:28 - 04:48. Astro Dark: 23:28 - 03:46

Total Clouds (% Sky Obscured)

100
100
96
96
100
86
88
89
100
100
100
100
100
100
100
100
100
96
84
95
94
86
80
87

Low Clouds (% Sky Obscured)

0
0
0
0
0
0
0
0
0
0
0
0
0
0
5
9
16
10
6
26
35
27
6
0

Medium Clouds (% Sky Obscured)

100
100
96
96
100
86
88
89
100
100
100
99
100
100
100
100
100
90
84
93
93
81
50
45

High Clouds (% Sky Obscured)

100
97
96
10
15
1
16
20
100
25
20
24
100
100
100
100
100
78
39
49
8
28
47
73

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 (%)

6
2
0
0
0
0
0
0
0
2
4
4
4
4
5
7
7
6
2
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
0
0
0
0
0

Wind Speed/Direction (mph)

6
5
6
5
5
5
6
6
6
7
8
9
8
8
8
10
10
10
10
10
9
9
10
12

Chance of Frost

Temperature (°C)

7
8
10
12
14
15
15
16
15
15
14
12
11
11
10
9
9
8
8
8
7
7
7
8

Feels Like (°C)

4
6
8
10
11
12
12
12
12
12
10
9
8
7
6
6
5
5
4
4
4
3
3
4

Dew Point (°C)

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

Relative Humidity (%)

63
58
52
45
40
36
31
30
31
36
42
47
53
55
58
68
72
71
71
71
73
75
74
69

Pressure (mb)

1025
1025
1025
1025
1025
1024
1024
1023
1023
1023
1023
1023
1023
1023
1023
1023
1023
1023
1023
1023
1023
1023
1023
1024

Ozone (du)

377
379
380
384
388
392
394
399
405
407
405
411
414
414
415
416
418
419
420
418
416
419
420
415

Tuesday 28

Waxing Gibbous 92%

17:43

05:11

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

Sun - Rise: 06:14, Set: 21:02, Transit: 13:39. Moon - Rise: 17:43, Set: 05:11. Civil Dark: 21:40 - 05:35. Nautical Dark: 22:30 - 04:45. Astro Dark: 23:32 - 03:42

Total Clouds (% Sky Obscured)

77
21
24
15
4
3
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
0
1
1

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)

40
12
19
12
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0

High Clouds (% Sky Obscured)

58
7
3
0
4
3
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)

13
13
14
14
15
15
15
15
15
15
13
13
12
12
11
12
12
12
12
11
12
12
11
12

Chance of Frost

Temperature (°C)

9
11
13
15
16
18
18
18
18
18
17
16
14
13
12
11
10
9
9
8
7
7
7
8

Feels Like (°C)

6
7
9
11
13
14
14
15
14
15
14
13
11
10
9
8
7
7
6
5
4
3
4
4

Dew Point (°C)

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

Relative Humidity (%)

59
50
44
39
38
37
38
38
39
42
45
47
50
53
56
59
61
61
61
61
61
62
64
61

Pressure (mb)

1024
1024
1024
1024
1024
1024
1024
1023
1023
1023
1023
1024
1024
1025
1025
1026
1026
1026
1026
1026
1027
1027
1027
1027

Ozone (du)

410
410
410
411
409
401
397
396
395
393
390
387
388
387
386
385
385
386
387
389
389
390
390
388

Wednesday 29

Waxing Gibbous 97%

18:58

05:21

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
01 Good
02 Good
03 Good
04 Good
05 Good
06 Good
07 Good
08 Good

Sun - Rise: 06:12, Set: 21:04, Transit: 13:39. Moon - Rise: 18:58, Set: 05:21. Civil Dark: 21:42 - 05:33. Nautical Dark: 22:33 - 04:42. Astro Dark: 23:35 - 03:39

Total Clouds (% Sky Obscured)

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

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
0
0
0
0
0

High Clouds (% Sky Obscured)

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

14
15
16
16
16
16
16
16
16
14
14
13
13
13
13
12
12
12
11
11
10
10
10
11

Chance of Frost

Temperature (°C)

9
12
14
15
16
17
18
18
18
18
17
16
14
13
12
11
11
10
9
8
8
8
7
8

Feels Like (°C)

6
8
9
11
12
13
14
14
14
15
14
13
11
9
8
8
7
7
6
5
5
4
5
4

Dew Point (°C)

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

Relative Humidity (%)

55
47
41
37
36
35
34
34
36
40
45
48
50
52
54
55
56
56
58
59
57
56
55
50

Pressure (mb)

1028
1028
1028
1028
1027
1027
1027
1026
1026
1026
1026
1026
1027
1027
1028
1028
1028
1028
1028
1028
1028
1029
1029
1029

Ozone (du)

387
388
388
387
387
387
386
384
382
382
380
379
377
376
375
373
371
371
371
372
371
371
371
370

Thursday 30

Waxing Gibbous 99%

20:13

05:34

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
01 Good
02 Good
03 Good
04 Good
05 Good
06 Good
07 Good
08 Good

Sun - Rise: 06:10, Set: 21:05, Transit: 13:39. Moon - Rise: 20:13, Set: 05:34. Civil Dark: 21:44 - 05:31. Nautical Dark: 22:35 - 04:40. Astro Dark: 23:39 - 03:35

Total Clouds (% Sky Obscured)

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

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
0
0
0
0
0

High Clouds (% Sky Obscured)

1
0
0
0
0
1
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)

13
14
15
16
16
16
16
16
14
13
12
10
9
9
9
9
9
9
8
8
8
8
8
8

Chance of Frost

Temperature (°C)

10
11
13
15
16
18
18
19
19
19
18
17
16
14
13
12
12
11
10
10
9
9
9
10

Feels Like (°C)

6
7
8
11
11
13
14
15
16
16
16
16
14
13
12
11
10
9
9
8
7
7
8
8

Dew Point (°C)

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

Relative Humidity (%)

45
41
37
33
31
28
29
28
31
33
37
45
54
59
60
59
58
58
61
63
68
70
69
63

Pressure (mb)

1029
1029
1029
1028
1028
1028
1027
1026
1026
1025
1025
1025
1025
1026
1026
1026
1026
1026
1026
1025
1025
1025
1025
1025

Ozone (du)

371
372
372
373
374
374
375
375
375
375
376
376
377
379
380
380
379
379
379
379
379
378
378
378

Friday 1

Full Moon 100%

21:28

05:51

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
01 Good
02 Good
03 Good
04 Good
05 OK
06 Bad
07 Bad
08 Bad

Sun - Rise: 06:08, Set: 21:07, Transit: 13:39. Moon - Rise: 21:28, Set: 05:51. Civil Dark: 21:46 - 05:29. Nautical Dark: 22:37 - 04:37. Astro Dark: 23:42 - 03:31

Total Clouds (% Sky Obscured)

0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
27
53
76
76

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
4

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
1

High Clouds (% Sky Obscured)

0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
14
27
41
49

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)

10
11
11
11
11
11
10
10
9
8
6
5
3
3
5
4
4
4
4
4
4
4
4
5

Chance of Frost

Temperature (°C)

12
14
17
18
20
21
22
23
23
23
22
20
18
17
15
14
14
14
13
13
12
13
13
14

Feels Like (°C)

10
12
15
16
17
19
20
21
22
22
23
22
21
20
19
19
18
17
14
14
14
14
13
13

Dew Point (°C)

3
4
4
4
4
5
5
5
6
7
8
8
7
6
5
6
6
7
7
7
8
8
8
8

Relative Humidity (%)

55
49
43
38
35
33
33
32
32
35
39
45
47
50
53
56
59
62
66
69
72
71
70
69

Pressure (mb)

1025
1025
1025
1024
1023
1023
1022
1022
1021
1021
1021
1020
1020
1020
1020
1020
1020
1019
1019
1019
1018
1018
1018
1018

Ozone (du)

379
380
381
381
379
377
376
377
376
375
373
373
375
376
377
378
378
378
378
378
378
377
376
375

Saturday 2

Waning Gibbous 98%

22:43

06:12

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
01 Bad
02 Bad
03 Bad
04 Bad
05 Bad
06 Bad
07 Bad
08 Bad

Sun - Rise: 06:06, Set: 21:09, Transit: 13:38. Moon - Rise: 22:43, Set: 06:12. Civil Dark: 21:48 - 05:27. Nautical Dark: 22:40 - 04:35. Astro Dark: 23:46 - 03:27

Total Clouds (% Sky Obscured)

74
75
84
92
100
100
100
100
100
99
99
96
93
88
92
97
100
89
79
69
75
81
89
93

Low Clouds (% Sky Obscured)

8
11
19
26
34
35
33
34
35
35
38
33
27
18
29
35
41
43
42
33
40
48
57
68

Medium Clouds (% Sky Obscured)

2
3
8
16
24
38
51
75
75
70
60
60
60
60
60
70
75
65
50
33
41
50
65
60

High Clouds (% Sky Obscured)

56
64
75
88
100
100
100
100
100
99
99
96
93
88
92
97
100
70
38
6
0
0
0
36

ISS Passover

Visibility (miles)

9
9
9
9
9
9
8
6
4
6
8
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
Very Light Rain
Very Light Rain
Very Light Rain
Light Rain
Light Rain
Light Rain
Light Rain
Light Rain
Light Rain
Light Rain
Very Light Rain
None
None
None
Very Light Rain

Precipitation Probability (%)

0
0
2
5
3
24
25
28
46
54
56
56
69
87
94
95
92
93
79
61
39
32
37
56

Precipitation Amount (mm)

0
0
0
0
0
0
0
0
0
0.3
0.3
0.2
0.4
0.6
0.6
0.7
0.6
0.7
0.4
0.3
0
0
0
0.2

Wind Speed/Direction (mph)

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

Chance of Frost

Temperature (°C)

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

Feels Like (°C)

15
16
16
17
17
18
21
21
20
20
20
20
17
18
18
17
17
16
12
12
12
12
12
13

Dew Point (°C)

9
9
9
9
9
8
8
7
7
8
9
9
10
10
11
11
11
11
10
10
10
11
12
13

Relative Humidity (%)

63
56
51
46
43
40
39
38
37
42
47
53
59
66
75
76
79
80
80
79
80
84
90
95

Pressure (mb)

1018
1018
1017
1017
1017
1016
1016
1015
1015
1015
1014
1014
1014
1014
1013
1013
1013
1012
1012
1012
1012
1012
1012
1012

Ozone (du)

375
374
374
373
372
371
370
370
369
370
371
372
373
374
374
375
376
377
378
378
379
378
377
376

Sunday 3

Waning Gibbous 95%

23:55

06:42

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
01 Bad

Sun - Rise: 06:04, Set: 21:10, Transit: 13:38. Moon - Rise: 23:55, Set: 06:42. Civil Dark: 21:50 - 05:25. Nautical Dark: 22:42 - 04:32. Astro Dark: 23:50 - 03:23

Total Clouds (% Sky Obscured)

97
100
100
100
100
99
98
97
98
99
100
97
93
91
93
95
98

Low Clouds (% Sky Obscured)

73
78
76
74
72
67
57
49
53
52
52
48
45
41
41
40
40

Medium Clouds (% Sky Obscured)

52
55
57
60
61
56
54
55
57
58
60
47
36
26
28
30
30

High Clouds (% Sky Obscured)

68
100
99
96
91
75
58
34
50
66
85
76
68
59
71
81
90

ISS Passover

Visibility (miles)

8
6
5
6
7
8
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

Precipitation Type

Light Rain
Light Rain
Light Rain
Light Rain
None
None
None
None
None
None
None
None
None
None
None
None
None

Precipitation Probability (%)

72
86
81
71
54
47
39
27
24
23
24
18
11
4
9
10
11

Precipitation Amount (mm)

0.4
0.6
0.5
0.4
0
0
0
0
0
0
0
0
0
0
0
0
0

Wind Speed/Direction (mph)

8
9
9
9
9
10
10
10
10
9
9
8
8
8
9
9
8

Chance of Frost

Temperature (°C)

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

Feels Like (°C)

13
14
14
14
14
14
16
15
14
15
14
14
11
11
11
10
10

Dew Point (°C)

13
14
14
14
14
14
13
13
12
12
11
11
10
10
10
9
8

Relative Humidity (%)

95
95
95
90
86
83
81
78
77
79
80
82
82
81
83
81
80

Pressure (mb)

1013
1013
1013
1013
1013
1013
1012
1012
1012
1012
1012
1012
1012
1012
1012
1012
1012

Ozone (du)

378
380
383
382
381
381
380
379
378
379
380
381
382
384
386
387
387

Forecast for Leiden, Gemeente Leiden, Netherlands (52.16,4.50)

Generated: 27/04/26 09:04:49. Forecast: 27/04/26 to 03/05/26. Timezone: UTC+2.00