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 2018-11-30.

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%
17612
13%
51658
9%
17570
38%
17570
17%
37917

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
10%
975
4%
2716
1%
970
13%
970
6%
2395
January16th to endNight
12%
1040
4%
2912
1%
1040
13%
1040
6%
2579
February1st to 15thNight
16%
796
6%
2383
2%
796
19%
796
7%
2024
February16th to endNight
20%
683
10%
2049
5%
683
24%
683
10%
1644
March1st to 15thNight
29%
780
13%
2331
9%
780
33%
780
17%
1686
March16th to endNight
32%
763
18%
2219
12%
763
38%
763
21%
1536
April1st to 15thNight
29%
584
13%
1947
9%
584
36%
584
17%
1357
April16th to endNight
40%
579
19%
1782
13%
579
46%
579
24%
1167
May1st to 15thNight
41%
585
14%
1755
10%
585
45%
585
20%
1215
May16th to endNight
51%
610
14%
1672
9%
609
55%
609
28%
1104
June1st to 15thNight
54%
585
16%
1560
12%
585
57%
585
33%
998
June16th to endNight
56%
585
14%
1560
10%
585
58%
585
32%
1010
July1st to 15thNight
68%
555
17%
1480
14%
555
69%
555
42%
864
July16th to endNight
66%
612
20%
1545
16%
579
68%
579
39%
930
August1st to 15thNight
70%
575
22%
1684
18%
572
72%
572
37%
957
August16th to endNight
62%
621
19%
2015
18%
621
65%
621
30%
1182
September1st to 15thNight
60%
643
25%
2008
23%
643
64%
643
32%
1181
September16th to endNight
55%
777
22%
2145
17%
777
57%
777
31%
1348
October1st to 15thNight
42%
780
20%
2177
14%
780
47%
780
23%
1509
October16th to endNight
22%
832
12%
2704
7%
832
29%
832
14%
1998
November1st to 15thNight
26%
820
14%
2666
11%
820
32%
820
14%
1971
November16th to endNight
17%
840
9%
2729
6%
840
22%
840
9%
2207
December1st to 15thNight
11%
952
3%
2707
1%
952
13%
952
5%
2415
December16th to endNight
8%
1040
4%
2912
0%
1040
12%
1040
5%
2640

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%34446%35%
52660
Night
16%11%5%7%5%33345%31%
51826
Cloud CoverDay
14%9%46%5%34446%35%
52669
Night
17%11%5%7%5%33445%31%
51831
TransparencyDay
48%6%11%20%11%1
52346
Night
54%410%17%10%1
51658
SeeingDay
17%9%26%27%14%4
7580
Night
22%10%25%26%13%1
17616

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%17%8%13%9%4433311%
1552
16th to endDay
14%21%10%14%10%3433210%
1664
February1st to 15thDay
14%15%9%15%11%4433315%
1806
16th to endDay
16%13%6%12%7%4444421%
1710
March1st to 15thDay
13%10%6%8%6%35%45%7%27%
1948
16th to endDay
16%8%46%5%24446%36%
2369
April1st to 15thDay
21%10%45%423446%32%
2331
16th to endDay
16%7%3433446%6%39%
2453
May1st to 15thDay
16%6%36%5%3446%8%35%
2526
16th to endDay
9%425%5%3445%9%45%
2793
June1st to 15thDay
9%424435%46%8%47%
2730
16th to endDay
9%42443445%8%46%
2730
July1st to 15thDay
5%31332346%9%53%
2730
16th to endDay
8%31343445%8%50%
2879
August1st to 15thDay
8%3144245%6%9%48%
2520
16th to endDay
12%42443345%7%48%
2538
September1st to 15thDay
13%5%24423347%46%
2269
16th to endDay
11%425%5%3445%9%43%
2145
October1st to 15thDay
21%8%25%5%3343337%
2112
16th to endDay
26%8%16%6%435%45%25%
1872
November1st to 15thDay
19%14%34433345%31%
1852
16th to endDay
22%21%5%9%424335%18%
1886
December1st to 15thDay
18%26%13%10%5%2322311%
1581
16th to endDay
22%22%10%11%6%3223310%
1664
January1st to 15thNight
21%17%9%12%10%3323312%
2716
16th to endNight
15%17%12%14%9%3433312%
2912
February1st to 15thNight
14%18%8%15%9%3332318%
2381
16th to endNight
18%14%6%10%7%4433422%
2049
March1st to 15thNight
16%11%48%5%23336%33%
2318
16th to endNight
16%8%46%5%3335%6%36%
2219
April1st to 15thNight
19%10%35%42445%7%31%
1947
16th to endNight
17%7%25%4235%47%40%
1782
May1st to 15thNight
18%6%26%6%35%45%6%35%
1755
16th to endNight
12%5%25%4335%5%8%41%
1670
June1st to 15thNight
10%5%25%5%24448%45%
1560
16th to endNight
9%434435%5%6%9%42%
1560
July1st to 15thNight
5%3145%2445%8%52%
1560
16th to endNight
8%21342446%10%50%
1641
August1st to 15thNight
6%324435%5%5%7%52%
1693
16th to endNight
10%425%42446%6%48%
2015
September1st to 15thNight
12%414324436%51%
2008
16th to endNight
11%425%5%3435%6%47%
2145
October1st to 15thNight
22%5%15%424435%39%
2177
16th to endNight
28%10%25%423235%30%
2704
November1st to 15thNight
21%13%46%5%33345%29%
2666
16th to endNight
22%21%6%7%42333420%
2729
December1st to 15thNight
22%25%10%9%5%2322411%
2707
16th to endNight
23%23%9%10%5%2333310%
2912

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%17%8%14%9%35%33311%
1552
16th to endDay
14%21%10%14%10%4442211%
1664
February1st to 15thDay
14%15%9%14%11%4333215%
1806
16th to endDay
16%13%6%12%7%44345%21%
1710
March1st to 15thDay
13%11%6%8%6%35%45%7%27%
1958
16th to endDay
16%9%46%5%24446%35%
2368
April1st to 15thDay
21%10%45%5%23446%32%
2331
16th to endDay
16%7%25%42445%6%39%
2453
May1st to 15thDay
17%6%36%5%2446%8%35%
2526
16th to endDay
9%4245%3445%9%45%
2793
June1st to 15thDay
9%425%425%45%7%47%
2730
16th to endDay
9%42443445%8%46%
2730
July1st to 15thDay
6%31332346%9%53%
2730
16th to endDay
8%3134345%5%8%50%
2879
August1st to 15thDay
8%3245%245%6%10%48%
2520
16th to endDay
12%42442345%7%48%
2538
September1st to 15thDay
13%5%34424447%45%
2269
16th to endDay
11%425%5%2445%10%43%
2145
October1st to 15thDay
22%8%25%43334437%
2112
16th to endDay
27%8%26%6%345%5%5%25%
1872
November1st to 15thDay
19%14%35%433445%31%
1852
16th to endDay
22%20%5%7%5%24335%18%
1886
December1st to 15thDay
18%27%12%10%5%2222312%
1581
16th to endDay
22%21%10%11%6%2233410%
1664
January1st to 15thNight
21%17%9%12%10%3332313%
2716
16th to endNight
15%17%12%13%9%3433412%
2912
February1st to 15thNight
14%17%8%15%9%4332318%
2374
16th to endNight
18%14%6%10%7%4334422%
2049
March1st to 15thNight
17%10%5%8%423346%33%
2331
16th to endNight
16%8%36%43345%6%36%
2219
April1st to 15thNight
19%10%35%42445%6%32%
1947
16th to endNight
17%6%244235%47%40%
1782
May1st to 15thNight
18%5%26%5%3445%6%34%
1754
16th to endNight
13%5%25%4345%5%8%41%
1670
June1st to 15thNight
10%425%5%235%48%45%
1560
16th to endNight
9%425%435%5%6%8%43%
1560
July1st to 15thNight
6%2245%3445%9%52%
1560
16th to endNight
7%2134245%6%10%50%
1641
August1st to 15thNight
6%3245%35%5%6%7%52%
1693
16th to endNight
10%425%43445%6%49%
2015
September1st to 15thNight
12%413324436%51%
2008
16th to endNight
11%425%6%2445%6%47%
2145
October1st to 15thNight
22%425%423435%39%
2177
16th to endNight
28%9%35%5%2333430%
2704
November1st to 15thNight
21%12%45%5%33335%29%
2666
16th to endNight
22%20%6%7%42333420%
2729
December1st to 15thNight
22%25%10%9%5%2222411%
2707
16th to endNight
23%23%9%9%6%2232310%
2912

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%6%1
1553
16th to endDay
80%47%42
1664
February1st to 15thDay
75%46%9%2
1808
16th to endDay
65%6%11%11%4
1710
March1st to 15thDay
56%6%13%15%7%
1958
16th to endDay
48%6%12%24%7%1
2369
April1st to 15thDay
53%5%8%20%11%
2331
16th to endDay
43%5%12%18%15%3
2453
May1st to 15thDay
45%6%13%23%9%1
2526
16th to endDay
35%7%14%27%13%1
2797
June1st to 15thDay
34%7%12%26%18%
2730
16th to endDay
33%7%16%23%17%1
2730
July1st to 15thDay
25%7%13%29%19%4
2581
16th to endDay
29%7%14%26%18%3
2712
August1st to 15thDay
30%8%13%31%14%1
2505
16th to endDay
34%7%13%24%16%2
2538
September1st to 15thDay
38%5%12%24%16%2
2269
16th to endDay
36%413%28%14%1
2145
October1st to 15thDay
50%48%23%11%1
2112
16th to endDay
59%6%13%14%5%
1872
November1st to 15thDay
55%5%11%17%8%
1852
16th to endDay
70%410%11%3
1886
December1st to 15thDay
80%36%7%2
1581
16th to endDay
79%48%5%
1664
January1st to 15thNight
78%38%7%2
2716
16th to endNight
77%410%5%1
2912
February1st to 15thNight
73%47%11%3
2383
16th to endNight
65%49%14%5%
2049
March1st to 15thNight
52%5%12%17%9%1
2331
16th to endNight
48%411%24%9%1
2219
April1st to 15thNight
51%5%9%17%15%
1947
16th to endNight
43%5%11%17%16%5%
1782
May1st to 15thNight
48%5%11%22%10%1
1755
16th to endNight
40%6%13%21%15%3
1672
June1st to 15thNight
36%5%10%27%17%1
1560
16th to endNight
36%6%15%23%15%1
1560
July1st to 15thNight
28%5%14%26%20%4
1480
16th to endNight
28%8%14%25%19%4
1545
August1st to 15thNight
28%6%14%28%18%2
1684
16th to endNight
34%6%10%27%17%3
2015
September1st to 15thNight
34%412%26%18%3
2008
16th to endNight
37%5%11%27%16%1
2145
October1st to 15thNight
47%48%23%14%1
2177
16th to endNight
58%313%17%6%
2704
November1st to 15thNight
57%410%15%9%1
2666
16th to endNight
68%311%13%2
2729
December1st to 15thNight
79%46%6%2
2707
16th to endNight
80%48%5%
2912

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
22%20%31%24%
135
16th to endDay
23%15%41%13%4
144
February1st to 15thDay
22%37%28%11%
135
16th to endDay
23%18%39%14%5%
120
March1st to 15thDay
20%24%34%13%5%
143
16th to endDay
25%10%27%25%9%1
352
April1st to 15thDay
28%11%32%19%6%
330
16th to endDay
19%12%29%22%11%4
319
May1st to 15thDay
21%11%28%25%8%3
348
16th to endDay
10%7%31%30%15%5%
549
June1st to 15thDay
12%5%28%34%15%3
570
16th to endDay
12%6%28%33%15%2
570
July1st to 15thDay
7%324%36%20%7%
550
16th to endDay
8%321%39%20%6%
595
August1st to 15thDay
8%120%29%28%11%
391
16th to endDay
18%5%15%30%20%10%
396
September1st to 15thDay
15%315%29%25%10%
375
16th to endDay
11%10%15%24%29%8%
374
October1st to 15thDay
27%9%20%26%13%1
355
16th to endDay
29%14%35%17%2
192
November1st to 15thDay
32%12%23%21%8%
180
16th to endDay
33%16%37%8%3
178
December1st to 15thDay
33%28%22%9%5%
135
16th to endDay
33%34%28%3
144
January1st to 15thNight
27%18%31%17%3
975
16th to endNight
21%16%35%23%2
1040
February1st to 15thNight
23%16%34%21%5%
799
16th to endNight
25%16%28%24%5%
683
March1st to 15thNight
21%14%28%27%7%
780
16th to endNight
19%7%33%29%8%1
763
April1st to 15thNight
22%11%30%27%6%1
584
16th to endNight
19%8%27%30%11%2
579
May1st to 15thNight
21%5%24%34%11%2
585
16th to endNight
14%421%34%22%1
611
June1st to 15thNight
11%322%39%22%1
585
16th to endNight
12%222%36%24%2
585
July1st to 15thNight
7%114%41%31%3
555
16th to endNight
9%113%38%32%3
612
August1st to 15thNight
6%112%43%30%6%
575
16th to endNight
12%314%34%29%6%
621
September1st to 15thNight
14%314%32%27%7%
643
16th to endNight
13%6%19%26%27%6%
777
October1st to 15thNight
25%7%20%29%16%1
780
16th to endNight
35%12%26%19%6%
832
November1st to 15thNight
29%13%25%21%9%
820
16th to endNight
35%16%25%17%4
840
December1st to 15thNight
34%18%28%15%2
952
16th to endNight
33%18%31%14%2
1040
Page generated at 2018-12-01 11:35:39. Version ac04

Copyright 2018 A. Danko


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