Insel Haus
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Insel Haus clear sky chart from 2005-11-05 to 2017-10-31.

This page is a summary of past forecasts. Even though it's based only on forecasts, some people use these pages as clue to a site's climate. But climate data based on actual observation should be preferred (if you can find it!).

Cloud, Transparency and Seeing forecasts are summarized individually. But because good observing conditions require a combination of minimum cloud cover, transparency and seeing, the individual forecast summaries can be difficult to interpret. The observing conditions section counts the combinations of conditions needed for common types of astronomical observation.

Observing Conditions

The following tables count the occurrence of the combinations of forecast and darkness conditions needed for different observations. Conditions are rated by by what percentage of the hours the observation would likely be attempted are usable.
Observation TypeMinimum conditions for hour to be usableOut of hours
Clear of CloudsTransparencySeeingSky Brightness
Planetary:50%(no limit)Average(no limit)Nighttime Hours
Deep Sky:70%Average(no limit)5.9Nighttime Hours
CCD Imaging:70%Below AveragePoor(no limit)Nighttime Hours

Percentages are of nighttime hours per month, or per year, when a particular observing conditions was met. Deep Sky percentages never exceed 50% because the moon is up half the time. Deep sky percentages are much lower for charts at high latitudes because of fewer dark hours in the summer.

Overall

PlanetaryData
Pts
Deep Sky
Max 60%
Data
Pts
Both Planetary and Deep Sky
Max 60%
Data
Pts
Either Planetary or Deep SkyData
Pts
CCD ImagingData
Pts
Night
31%
15769
12%
47348
7%
15724
36%
15724
16%
34517

By Month

MonthDays of MonthPlanetaryData
Pts
Deep Sky
Max 60%
Data
Pts
Both Planetary and Deep Sky
Max 60%
Data
Pts
Either Planetary or Deep SkyData
Pts
CCD ImagingData
Pts
January1st to 15thNight
16%
900
5%
2511
2%
895
19%
895
7%
2149
January16th to endNight
17%
960
8%
2688
3%
960
21%
960
9%
2221
February1st to 15thNight
18%
739
9%
2312
3%
737
25%
737
10%
1800
February16th to endNight
26%
631
11%
1893
5%
631
32%
631
12%
1463
March1st to 15thNight
28%
720
15%
2112
8%
720
34%
720
19%
1475
March16th to endNight
34%
759
19%
2103
10%
759
42%
759
21%
1435
April1st to 15thNight
32%
539
16%
1758
11%
539
38%
539
17%
1215
April16th to endNight
35%
540
18%
1620
8%
540
44%
540
19%
1074
May1st to 15thNight
37%
540
13%
1620
8%
540
42%
540
18%
1113
May16th to endNight
46%
488
17%
1439
10%
486
53%
486
27%
883
June1st to 15thNight
40%
360
13%
1260
8%
360
48%
360
20%
772
June16th to endNight
52%
360
12%
1260
10%
360
56%
360
23%
768
July1st to 15thNight
56%
432
14%
1282
11%
432
59%
432
32%
748
July16th to endNight
53%
564
15%
1417
10%
531
60%
531
31%
882
August1st to 15thNight
58%
539
19%
1569
15%
536
62%
536
34%
887
August16th to endNight
56%
573
18%
1734
12%
573
61%
573
30%
1017
September1st to 15thNight
48%
625
15%
1885
11%
625
51%
625
26%
1196
September16th to endNight
51%
717
18%
1980
14%
717
54%
717
29%
1298
October1st to 15thNight
38%
720
15%
2064
11%
720
42%
720
21%
1437
October16th to endNight
24%
768
9%
2480
6%
768
29%
768
11%
1969
November1st to 15thNight
25%
700
14%
2276
11%
700
30%
700
12%
1707
November16th to endNight
15%
735
6%
2505
4%
735
19%
735
6%
2117
December1st to 15thNight
10%
900
3%
2700
1%
900
12%
900
5%
2373
December16th to endNight
11%
960
5%
2880
2%
960
14%
960
5%
2518

Individual Forecasts

The length of each colored bar in the "occurrence of each Forecast" column is proportional to the number of times the chart forecast that color. The percentages are of the total number of hours per month, or per year, with a particular forecast. The colors as the same as those used in clear sky charts.

Note: Transparency probabilities are only counted for those hours that have 30% or less cloud cover. Seeing probabilities are only counted for those hours that have 80% or less cloud cover. If that's too tricky, try Observing Conditions instead.

Overall

Occurrence of each ForecastData
Points
Cloud CoverDay
14%9%36%6%3445%7%34%
48406
Night
15%10%48%6%34446%29%
47514
Cloud CoverDay
14%9%36%6%3445%7%34%
48415
Night
16%10%48%6%34446%29%
47519
TransparencyDay
48%413%22%9%
48090
Night
55%412%19%8%
47348
SeeingDay
16%11%21%28%17%4
6152
Night
17%19%21%26%12%2
15770

By Month

Percentage Cloud Cover NE (2006-)
Color Meanings:
Overcast 90% covered 80% covered 70% covered 60% covered 50% covered 40% covered 30% covered 20% covered 10% covered Clear
MonthDays in MonthOccurrence of each ForecastData
Points
January1st to 15thDay
15%15%7%15%9%5%7%44410%
1426
16th to endDay
12%15%7%13%11%45%5%45%13%
1536
February1st to 15thDay
11%13%6%10%8%45%35%6%23%
1549
16th to endDay
12%11%5%8%9%45%45%7%25%
1580
March1st to 15thDay
13%9%46%7%4435%5%35%
1838
16th to endDay
12%8%35%5%35%45%6%39%
2130
April1st to 15thDay
18%9%36%5%3445%7%32%
2190
16th to endDay
15%8%36%5%3445%7%36%
2340
May1st to 15thDay
15%7%35%435%5%46%37%
2331
16th to endDay
12%6%245%25%448%42%
2673
June1st to 15thDay
13%5%245%35%5%6%9%38%
2700
16th to endDay
12%5%25%425%5%6%9%40%
2700
July1st to 15thDay
8%423435%5%48%49%
2598
16th to endDay
8%5%24425%46%8%48%
2655
August1st to 15thDay
9%42442345%8%49%
2379
16th to endDay
10%5%15%42445%8%47%
2465
September1st to 15thDay
14%425%5%3445%7%43%
2062
16th to endDay
13%5%345%235%48%42%
1980
October1st to 15thDay
20%9%26%434447%32%
1896
16th to endDay
23%13%46%6%35%45%7%17%
1741
November1st to 15thDay
16%13%49%6%45%45%7%22%
1582
16th to endDay
20%18%8%11%8%45%33311%
1451
December1st to 15thDay
18%18%10%14%10%443337%
1260
16th to endDay
20%19%8%13%9%35%33211%
1344
January1st to 15thNight
17%15%7%12%9%5%5%44413%
2511
16th to endNight
13%13%7%11%11%45%5%45%16%
2688
February1st to 15thNight
11%14%6%9%9%46%5%5%5%21%
2310
16th to endNight
14%11%6%9%9%36%45%5%21%
1893
March1st to 15thNight
13%9%5%8%5%34446%35%
2099
16th to endNight
13%7%46%5%35%445%39%
2103
April1st to 15thNight
19%8%35%5%345%45%33%
1758
16th to endNight
15%7%25%5%26%45%5%38%
1620
May1st to 15thNight
14%8%37%6%35%36%6%33%
1620
16th to endNight
13%42442445%7%45%
1437
June1st to 15thNight
13%6%25%5%2446%9%38%
1260
16th to endNight
11%425%5%35%5%6%8%41%
1260
July1st to 15thNight
9%415%5%34447%48%
1360
16th to endNight
8%423435%5%6%6%48%
1513
August1st to 15thNight
7%324423348%53%
1578
16th to endNight
9%5%24425%35%8%49%
1734
September1st to 15thNight
15%6%145%3245%5%45%
1885
16th to endNight
16%6%25%42346%8%39%
1980
October1st to 15thNight
20%7%26%5%24446%35%
2064
16th to endNight
24%11%47%7%445%45%20%
2480
November1st to 15thNight
17%14%5%7%6%25%447%23%
2276
16th to endNight
21%17%7%11%7%3444412%
2505
December1st to 15thNight
18%18%8%13%11%35%3339%
2700
16th to endNight
20%18%9%12%7%3443311%
2880

Percentage Cloud Cover SE (2006-)
Color Meanings:
Overcast 90% covered 80% covered 70% covered 60% covered 50% covered 40% covered 30% covered 20% covered 10% covered Clear
MonthDays in MonthOccurrence of each ForecastData
Points
January1st to 15thDay
17%13%8%14%11%5%6%44310%
1426
16th to endDay
12%15%9%12%12%36%5%45%12%
1536
February1st to 15thDay
12%13%7%9%9%45%35%6%22%
1549
16th to endDay
11%13%5%8%8%45%447%25%
1580
March1st to 15thDay
13%9%47%7%35%34436%
1848
16th to endDay
13%7%35%5%35%45%6%38%
2129
April1st to 15thDay
18%9%26%5%34447%33%
2190
16th to endDay
15%8%35%43445%6%37%
2340
May1st to 15thDay
15%8%35%435%5%46%37%
2331
16th to endDay
11%6%25%435%448%42%
2673
June1st to 15thDay
13%5%244345%6%9%38%
2700
16th to endDay
12%5%25%5%25%46%8%40%
2700
July1st to 15thDay
9%424425%5%5%9%48%
2598
16th to endDay
9%42433446%8%48%
2655
August1st to 15thDay
9%42442345%8%49%
2379
16th to endDay
10%5%15%42445%8%46%
2465
September1st to 15thDay
13%5%25%43445%7%42%
2062
16th to endDay
15%5%2443436%7%42%
1980
October1st to 15thDay
21%9%25%434446%32%
1896
16th to endDay
24%13%47%5%35%45%6%17%
1741
November1st to 15thDay
18%13%5%8%6%25%5%47%22%
1582
16th to endDay
20%19%7%12%8%35%33311%
1451
December1st to 15thDay
18%19%8%16%11%444337%
1260
16th to endDay
20%18%10%11%8%4432310%
1344
January1st to 15thNight
18%14%6%13%9%46%5%3412%
2511
16th to endNight
13%13%7%13%10%45%44417%
2688
February1st to 15thNight
11%14%6%10%9%36%5%5%5%20%
2303
16th to endNight
13%11%6%10%8%45%5%5%5%21%
1893
March1st to 15thNight
14%9%48%6%3443436%
2112
16th to endNight
13%8%47%5%35%345%38%
2103
April1st to 15thNight
19%9%26%5%345%5%5%33%
1758
16th to endNight
15%7%35%435%5%5%5%38%
1620
May1st to 15thNight
15%8%37%5%35%45%7%33%
1619
16th to endNight
13%5%1442445%7%46%
1437
June1st to 15thNight
13%6%26%5%35%35%8%39%
1260
16th to endNight
12%415%425%5%6%9%41%
1260
July1st to 15thNight
9%425%5%3345%6%49%
1360
16th to endNight
8%424425%5%5%7%48%
1513
August1st to 15thNight
8%314423348%52%
1578
16th to endNight
9%5%14425%35%7%48%
1734
September1st to 15thNight
16%6%15%423346%44%
1885
16th to endNight
15%7%25%5%2445%7%40%
1980
October1st to 15thNight
20%9%25%5%23446%34%
2064
16th to endNight
25%12%47%6%34445%19%
2480
November1st to 15thNight
17%15%47%5%3345%7%23%
2276
16th to endNight
22%18%6%10%7%4334412%
2505
December1st to 15thNight
19%17%9%14%9%35%43310%
2700
16th to endNight
20%19%9%11%7%3443310%
2880

Transparency (when cloud cover <= 30%)
Color Meanings:
Too cloudy to forecast Poor Below Average Average Above average Transparent
MonthDays in MonthOccurrence of each ForecastData
Points
January1st to 15thDay
75%5%8%9%1
1427
16th to endDay
71%5%10%9%2
1536
February1st to 15thDay
61%5%15%13%5%
1551
16th to endDay
56%315%18%6%
1580
March1st to 15thDay
50%313%22%9%1
1848
16th to endDay
44%413%25%9%2
2130
April1st to 15thDay
52%39%21%12%
2190
16th to endDay
45%311%19%16%2
2340
May1st to 15thDay
45%410%24%11%3
2331
16th to endDay
39%5%13%27%12%1
2677
June1st to 15thDay
40%414%27%11%1
2700
16th to endDay
39%5%16%24%12%1
2700
July1st to 15thDay
32%5%14%31%14%1
2447
16th to endDay
33%5%15%29%16%
2488
August1st to 15thDay
31%418%32%13%
2364
16th to endDay
35%418%30%10%1
2465
September1st to 15thDay
38%5%14%31%9%
2062
16th to endDay
39%418%30%7%
1980
October1st to 15thDay
51%413%22%8%
1896
16th to endDay
63%6%12%14%3
1741
November1st to 15thDay
59%313%16%6%
1582
16th to endDay
78%211%6%1
1451
December1st to 15thDay
81%27%6%1
1260
16th to endDay
78%29%7%1
1344
January1st to 15thNight
73%310%9%2
2511
16th to endNight
68%410%13%2
2688
February1st to 15thNight
62%5%12%14%4
2312
16th to endNight
61%413%14%5%
1893
March1st to 15thNight
51%312%21%10%
2112
16th to endNight
46%311%23%12%1
2103
April1st to 15thNight
50%47%24%11%1
1758
16th to endNight
45%49%22%15%3
1620
May1st to 15thNight
49%310%18%13%3
1620
16th to endNight
36%5%12%28%14%2
1439
June1st to 15thNight
41%312%24%17%
1260
16th to endNight
38%5%13%28%11%1
1260
July1st to 15thNight
33%313%29%17%1
1282
16th to endNight
34%5%15%26%17%
1417
August1st to 15thNight
30%417%33%12%1
1569
16th to endNight
33%5%19%28%12%
1734
September1st to 15thNight
40%414%26%12%
1885
16th to endNight
42%317%28%7%
1980
October1st to 15thNight
49%312%23%9%
2064
16th to endNight
65%411%14%4
2480
November1st to 15thNight
59%412%18%5%
2276
16th to endNight
73%410%8%2
2505
December1st to 15thNight
78%49%7%
2700
16th to endNight
77%39%7%1
2880

Seeing (when cloud cover <= 80%)
Color Meanings:
Too cloudy to forecast Bad 1/5 Poor 2/5 Average 3/5 Good 4/5 Excellent 5/5
MonthDays in MonthOccurrence of each ForecastData
Points
January1st to 15thDay
21%6%39%26%5%
89
16th to endDay
29%320%33%12%1
96
February1st to 15thDay
23%14%37%16%7%
90
16th to endDay
19%7%39%25%7%
81
March1st to 15thDay
12%13%31%25%16%
138
16th to endDay
23%14%19%28%9%3
288
April1st to 15thDay
20%15%22%24%15%1
270
16th to endDay
22%13%27%22%10%3
270
May1st to 15thDay
20%13%24%24%14%2
288
16th to endDay
13%15%21%30%15%3
498
June1st to 15thDay
13%15%25%30%12%2
495
16th to endDay
14%15%18%28%20%3
495
July1st to 15thDay
10%9%18%34%22%5%
475
16th to endDay
11%14%16%28%23%5%
515
August1st to 15thDay
11%8%11%34%27%7%
352
16th to endDay
16%7%14%29%25%6%
332
September1st to 15thDay
13%5%16%24%25%15%
315
16th to endDay
15%8%14%27%27%7%
314
October1st to 15thDay
23%9%22%29%13%2
315
16th to endDay
35%5%26%25%5%1
157
November1st to 15thDay
13%7%33%30%13%2
90
16th to endDay
23%16%32%24%3
65
December1st to 15thDay
28%21%31%13%31
60
16th to endDay
28%23%42%6%
64
January1st to 15thNight
20%24%27%20%7%
900
16th to endNight
16%23%26%24%7%1
960
February1st to 15thNight
17%22%29%23%5%
740
16th to endNight
16%20%23%27%11%
631
March1st to 15thNight
15%22%25%25%10%1
720
16th to endNight
15%21%22%30%9%1
759
April1st to 15thNight
19%19%24%27%7%1
539
16th to endNight
17%19%22%25%13%1
540
May1st to 15thNight
15%18%19%29%15%1
540
16th to endNight
12%19%17%30%19%1
488
June1st to 15thNight
12%20%16%33%16%1
360
16th to endNight
14%17%10%29%24%3
360
July1st to 15thNight
10%12%11%36%23%5%
432
16th to endNight
9%17%12%34%21%4
564
August1st to 15thNight
10%11%13%33%26%4
539
16th to endNight
11%10%12%35%24%4
573
September1st to 15thNight
15%11%17%26%20%8%
625
16th to endNight
16%11%13%31%20%7%
717
October1st to 15thNight
20%14%19%31%14%1
720
16th to endNight
30%16%21%26%5%
768
November1st to 15thNight
21%20%25%22%9%1
700
16th to endNight
25%27%23%18%4
735
December1st to 15thNight
22%27%30%15%3
900
16th to endNight
24%26%26%17%31
960
Page generated at 2017-11-01 17:23:33. Version ac04

Copyright 2017 A. Danko


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