Vivekananda Monastery
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Vivekananda Monastery clear sky chart from 2005-11-05 to 2017-09-19.

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
34%
15986
13%
46848
9%
15944
38%
15944
17%
34315

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
11%
900
5%
2506
1%
895
13%
895
6%
2203
January16th to endNight
11%
960
3%
2688
1%
960
13%
960
5%
2404
February1st to 15thNight
16%
734
5%
2197
2%
734
20%
734
7%
1856
February16th to endNight
21%
631
10%
1893
5%
631
26%
631
10%
1519
March1st to 15thNight
29%
720
13%
2152
9%
720
33%
720
17%
1565
March16th to endNight
31%
704
17%
2048
11%
704
37%
704
21%
1432
April1st to 15thNight
30%
539
13%
1797
9%
539
37%
539
18%
1234
April16th to endNight
39%
540
19%
1665
12%
540
46%
540
23%
1096
May1st to 15thNight
41%
540
14%
1620
9%
540
45%
540
20%
1121
May16th to endNight
50%
562
14%
1540
9%
561
54%
561
28%
1014
June1st to 15thNight
53%
540
15%
1440
11%
540
57%
540
34%
918
June16th to endNight
56%
540
15%
1440
11%
540
58%
540
32%
932
July1st to 15thNight
67%
510
16%
1360
13%
510
68%
510
41%
803
July16th to endNight
66%
564
20%
1417
16%
531
68%
531
38%
852
August1st to 15thNight
69%
539
22%
1581
18%
536
72%
536
37%
898
August16th to endNight
63%
573
20%
1859
19%
573
66%
573
31%
1079
September1st to 15thNight
60%
594
24%
1854
22%
594
64%
594
33%
1081
September16th to endNight
55%
673
21%
1858
16%
673
58%
673
31%
1177
October1st to 15thNight
46%
660
22%
1842
16%
660
51%
660
26%
1235
October16th to endNight
21%
704
11%
2288
7%
704
28%
704
13%
1707
November1st to 15thNight
29%
700
16%
2276
13%
700
35%
700
17%
1615
November16th to endNight
19%
720
9%
2340
7%
720
23%
720
9%
1898
December1st to 15thNight
11%
879
3%
2499
1%
879
13%
879
5%
2239
December16th to endNight
9%
960
4%
2688
1%
960
12%
960
5%
2437

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%46%5%3445%7%35%
47984
Night
16%11%5%7%5%34346%31%
47016
Cloud CoverDay
14%9%46%5%34446%35%
47993
Night
17%11%5%7%5%23345%32%
47021
TransparencyDay
48%6%12%20%11%1
47670
Night
54%411%17%10%1
46848
SeeingDay
16%8%26%27%15%5%
5980
Night
21%10%25%27%13%1
15990

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
17%18%9%12%9%45%33311%
1432
16th to endDay
14%21%10%15%10%442229%
1536
February1st to 15thDay
13%15%9%14%11%4433315%
1663
16th to endDay
16%13%6%12%6%4444420%
1580
March1st to 15thDay
13%11%6%8%6%35%45%7%27%
1797
16th to endDay
16%8%46%5%24446%36%
2187
April1st to 15thDay
21%10%34423446%33%
2151
16th to endDay
16%6%3443445%6%39%
2295
May1st to 15thDay
16%6%36%5%3446%8%36%
2331
16th to endDay
9%425%5%2445%9%45%
2573
June1st to 15thDay
9%425%435%46%7%46%
2520
16th to endDay
9%4244345%5%9%46%
2520
July1st to 15thDay
6%41342446%10%51%
2520
16th to endDay
8%31343446%9%50%
2655
August1st to 15thDay
8%3144245%6%10%47%
2370
16th to endDay
11%42443345%7%48%
2342
September1st to 15thDay
13%5%24423447%46%
2094
16th to endDay
12%425%5%3345%10%42%
1848
October1st to 15thDay
19%7%25%5%3443340%
1788
16th to endDay
27%8%26%5%435%45%25%
1584
November1st to 15thDay
16%13%245%33446%34%
1582
16th to endDay
23%20%5%9%424345%17%
1620
December1st to 15thDay
18%26%14%10%5%1321311%
1460
16th to endDay
23%22%10%11%5%2324311%
1536
January1st to 15thNight
21%17%10%11%8%3323313%
2506
16th to endNight
15%17%12%14%10%3433311%
2688
February1st to 15thNight
14%18%8%15%9%3332318%
2195
16th to endNight
17%14%6%10%7%4433422%
1893
March1st to 15thNight
16%11%48%423336%33%
2139
16th to endNight
16%8%46%5%33346%35%
2048
April1st to 15thNight
18%10%35%42445%7%32%
1797
16th to endNight
17%6%244235%47%40%
1665
May1st to 15thNight
18%6%26%5%35%45%6%35%
1620
16th to endNight
12%6%35%4335%6%7%41%
1538
June1st to 15thNight
10%425%5%24448%46%
1440
16th to endNight
8%4345%36%5%6%9%42%
1440
July1st to 15thNight
6%3245%3445%8%51%
1440
16th to endNight
8%2134245%6%10%50%
1513
August1st to 15thNight
6%3244345%5%7%52%
1590
16th to endNight
10%425%42435%6%49%
1859
September1st to 15thNight
13%414324436%51%
1854
16th to endNight
11%425%6%3435%6%46%
1858
October1st to 15thNight
21%5%14424436%42%
1842
16th to endNight
28%9%36%42423429%
2288
November1st to 15thNight
19%11%35%433345%33%
2276
16th to endNight
22%20%6%8%42333420%
2340
December1st to 15thNight
23%25%10%9%42322410%
2499
16th to endNight
24%24%9%9%42333310%
2688

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%18%9%13%8%35%33312%
1432
16th to endDay
14%22%10%14%11%443229%
1536
February1st to 15thDay
13%15%10%14%11%4433315%
1663
16th to endDay
15%13%7%12%6%44445%20%
1580
March1st to 15thDay
13%11%5%8%6%35%447%27%
1807
16th to endDay
16%9%45%5%24446%35%
2186
April1st to 15thDay
21%10%35%423436%33%
2151
16th to endDay
16%7%2442445%6%39%
2295
May1st to 15thDay
17%6%36%5%2446%7%36%
2331
16th to endDay
9%425%5%3445%9%45%
2573
June1st to 15thDay
9%425%435%45%7%46%
2520
16th to endDay
9%4244345%6%8%46%
2520
July1st to 15thDay
6%31442446%9%51%
2520
16th to endDay
8%3134345%5%9%50%
2655
August1st to 15thDay
8%3244245%6%10%47%
2370
16th to endDay
11%42442345%7%48%
2342
September1st to 15thDay
13%43442445%7%45%
2094
16th to endDay
12%425%5%2445%10%41%
1848
October1st to 15thDay
19%7%25%43344440%
1788
16th to endDay
28%7%25%6%345%45%25%
1584
November1st to 15thDay
16%13%25%5%33435%34%
1582
16th to endDay
23%20%5%7%5%24335%17%
1620
December1st to 15thDay
18%26%12%11%5%2221312%
1460
16th to endDay
23%21%10%11%5%2233411%
1536
January1st to 15thNight
21%17%9%11%9%3332313%
2506
16th to endNight
15%18%12%13%10%3333311%
2688
February1st to 15thNight
14%17%8%14%9%4332318%
2188
16th to endNight
17%14%6%11%7%4334422%
1893
March1st to 15thNight
17%11%48%423346%33%
2152
16th to endNight
16%8%36%5%34446%35%
2048
April1st to 15thNight
19%10%35%4245%5%6%32%
1797
16th to endNight
18%5%244235%47%40%
1665
May1st to 15thNight
18%5%26%5%3445%6%35%
1619
16th to endNight
13%5%35%43445%7%41%
1538
June1st to 15thNight
10%425%5%235%48%46%
1440
16th to endNight
8%425%435%5%6%8%42%
1440
July1st to 15thNight
6%2245%3445%9%51%
1440
16th to endNight
7%2134245%6%10%50%
1513
August1st to 15thNight
6%3245%345%6%7%52%
1590
16th to endNight
10%425%42335%6%50%
1859
September1st to 15thNight
13%413324436%52%
1854
16th to endNight
11%425%6%24346%46%
1858
October1st to 15thNight
21%425%424435%42%
1842
16th to endNight
28%9%35%5%1333430%
2288
November1st to 15thNight
19%11%45%433336%33%
2276
16th to endNight
23%19%7%8%32333420%
2340
December1st to 15thNight
23%25%10%9%5%2222411%
2499
16th to endNight
24%24%9%9%5%2232310%
2688

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
77%6%8%5%1
1433
16th to endDay
82%46%42
1536
February1st to 15thDay
74%47%10%2
1665
16th to endDay
66%6%11%11%4
1580
March1st to 15thDay
56%6%13%14%7%
1807
16th to endDay
48%7%12%24%6%1
2187
April1st to 15thDay
52%5%8%20%12%
2151
16th to endDay
43%6%13%18%13%3
2295
May1st to 15thDay
45%6%13%23%9%1
2331
16th to endDay
36%7%14%27%13%1
2577
June1st to 15thDay
34%7%11%26%18%
2520
16th to endDay
32%7%16%23%18%1
2520
July1st to 15thDay
27%7%14%28%19%2
2371
16th to endDay
29%7%14%27%18%2
2488
August1st to 15thDay
30%8%13%31%13%2
2355
16th to endDay
33%7%13%25%16%2
2342
September1st to 15thDay
37%5%12%24%16%2
2094
16th to endDay
37%414%28%13%
1848
October1st to 15thDay
47%48%25%12%
1788
16th to endDay
58%6%14%14%4
1584
November1st to 15thDay
51%5%11%19%10%1
1582
16th to endDay
70%410%11%2
1620
December1st to 15thDay
80%36%7%1
1460
16th to endDay
78%49%5%
1536
January1st to 15thNight
77%38%7%2
2506
16th to endNight
79%49%5%1
2688
February1st to 15thNight
72%48%11%3
2197
16th to endNight
65%410%14%5%
1893
March1st to 15thNight
52%5%13%17%8%1
2152
16th to endNight
49%412%24%7%1
2048
April1st to 15thNight
50%5%10%17%15%1
1797
16th to endNight
43%6%11%18%15%4
1665
May1st to 15thNight
48%5%11%22%10%2
1620
16th to endNight
39%6%14%21%15%2
1540
June1st to 15thNight
36%5%11%26%18%1
1440
16th to endNight
36%7%15%22%15%1
1440
July1st to 15thNight
28%5%14%26%20%3
1360
16th to endNight
27%8%14%24%20%4
1417
August1st to 15thNight
29%6%14%28%19%2
1581
16th to endNight
33%5%10%27%18%3
1859
September1st to 15thNight
34%413%26%18%3
1854
16th to endNight
38%412%27%15%1
1858
October1st to 15thNight
44%49%25%15%
1842
16th to endNight
59%313%16%6%
2288
November1st to 15thNight
53%411%17%11%1
2276
16th to endNight
68%311%13%2
2340
December1st to 15thNight
80%46%6%2
2499
16th to endNight
80%47%5%
2688

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
20%25%34%18%1
90
16th to endDay
28%11%40%13%6%
96
February1st to 15thDay
20%38%28%11%1
90
16th to endDay
20%14%37%19%7%
81
March1st to 15thDay
24%20%35%12%6%1
97
16th to endDay
28%10%25%22%10%2
288
April1st to 15thDay
28%8%32%21%7%1
270
16th to endDay
21%12%31%18%11%4
270
May1st to 15thDay
20%11%28%25%9%4
288
16th to endDay
9%8%33%30%12%5%
473
June1st to 15thDay
12%429%33%15%3
495
16th to endDay
10%6%30%31%16%3
495
July1st to 15thDay
8%326%35%18%7%
475
16th to endDay
7%320%40%20%7%
515
August1st to 15thDay
9%118%28%29%12%
343
16th to endDay
17%415%31%20%10%
332
September1st to 15thDay
13%315%31%26%9%
315
16th to endDay
13%8%14%23%31%8%
266
October1st to 15thDay
18%10%19%30%17%2
239
16th to endDay
28%13%39%18%
96
November1st to 15thDay
13%11%27%32%14%1
90
16th to endDay
38%14%34%6%5%
90
December1st to 15thDay
35%28%21%10%4
90
16th to endDay
35%34%26%31
96
January1st to 15thNight
28%18%31%17%4
900
16th to endNight
20%15%35%24%2
960
February1st to 15thNight
22%16%32%21%5%
737
16th to endNight
24%15%28%25%5%
631
March1st to 15thNight
22%14%27%26%7%
720
16th to endNight
20%8%32%29%8%1
704
April1st to 15thNight
20%11%31%28%6%1
539
16th to endNight
19%8%27%30%10%2
540
May1st to 15thNight
21%5%25%35%11%1
540
16th to endNight
13%5%23%36%20%1
563
June1st to 15thNight
11%222%39%22%1
540
16th to endNight
11%223%35%24%2
540
July1st to 15thNight
8%115%41%29%3
510
16th to endNight
8%114%39%31%4
564
August1st to 15thNight
7%111%44%29%6%
539
16th to endNight
12%313%35%29%6%
573
September1st to 15thNight
14%414%32%26%6%
594
16th to endNight
14%6%18%28%27%5%
673
October1st to 15thNight
23%6%19%30%18%1
660
16th to endNight
35%12%26%18%6%
704
November1st to 15thNight
25%13%26%23%10%
700
16th to endNight
33%17%24%18%5%
720
December1st to 15thNight
35%17%28%15%2
879
16th to endNight
34%17%30%13%2
960
Page generated at 2017-09-20 04:49:46. Version ac04

Copyright 2017 A. Danko


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