Shipshewana
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Shipshewana clear sky chart from 2005-11-05 to 2017-09-17.

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
37%
15910
15%
46811
10%
15868
42%
15868
20%
32929

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
9%
2506
3%
895
22%
895
11%
2010
January16th to endNight
18%
939
8%
2667
3%
939
22%
939
11%
2178
February1st to 15thNight
20%
701
9%
2169
3%
701
26%
701
12%
1668
February16th to endNight
24%
631
12%
1893
5%
631
30%
631
14%
1451
March1st to 15thNight
28%
720
13%
2133
8%
720
31%
720
18%
1534
March16th to endNight
31%
735
16%
2079
9%
735
37%
735
20%
1486
April1st to 15thNight
31%
539
13%
1797
8%
539
38%
539
19%
1232
April16th to endNight
32%
540
19%
1656
10%
540
41%
540
22%
1110
May1st to 15thNight
36%
540
12%
1620
7%
540
42%
540
20%
1168
May16th to endNight
50%
562
15%
1602
11%
561
54%
561
29%
1022
June1st to 15thNight
54%
540
16%
1440
10%
540
59%
540
35%
902
June16th to endNight
57%
540
15%
1440
11%
540
60%
540
32%
934
July1st to 15thNight
68%
510
17%
1360
15%
510
68%
510
38%
826
July16th to endNight
71%
564
20%
1437
16%
531
72%
531
39%
856
August1st to 15thNight
71%
539
22%
1609
18%
536
75%
536
36%
936
August16th to endNight
66%
573
20%
1847
19%
573
69%
573
31%
1091
September1st to 15thNight
61%
615
26%
1875
24%
615
65%
615
35%
1091
September16th to endNight
58%
665
25%
1837
20%
665
61%
665
34%
1123
October1st to 15thNight
48%
660
25%
1837
19%
660
53%
660
31%
1153
October16th to endNight
27%
704
15%
2270
10%
704
35%
704
17%
1576
November1st to 15thNight
35%
700
21%
2276
17%
700
42%
700
22%
1478
November16th to endNight
26%
720
13%
2340
10%
720
31%
720
12%
1794
December1st to 15thNight
18%
813
7%
2433
3%
813
22%
813
9%
2005
December16th to endNight
15%
960
7%
2688
2%
960
19%
960
8%
2305

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%8%46%5%35%45%7%33%
47973
Night
15%9%46%5%34446%35%
46982
Cloud CoverDay
14%8%46%5%35%45%7%34%
47982
Night
15%9%46%5%34446%35%
46987
TransparencyDay
49%6%12%18%11%1
47662
Night
49%5%11%19%11%1
46811
SeeingDay
17%7%24%25%17%7%
5912
Night
19%7%28%29%13%1
15914

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
19%15%6%11%5%34435%19%
1432
16th to endDay
13%17%11%11%8%46%335%14%
1556
February1st to 15thDay
14%15%8%10%7%45%345%20%
1690
16th to endDay
16%13%8%11%6%46%446%18%
1580
March1st to 15thDay
17%11%5%8%6%35%347%25%
1817
16th to endDay
19%9%46%6%34446%30%
2156
April1st to 15thDay
20%10%45%424446%31%
2151
16th to endDay
17%7%35%6%23347%37%
2304
May1st to 15thDay
20%8%36%5%2445%7%30%
2331
16th to endDay
12%5%35%5%35%46%7%39%
2511
June1st to 15thDay
10%5%25%5%3446%8%41%
2520
16th to endDay
9%5%25%5%36%5%6%10%38%
2520
July1st to 15thDay
7%5%25%5%35%5%5%9%44%
2520
16th to endDay
6%424436%6%7%10%42%
2633
August1st to 15thDay
7%3245%35%5%7%9%43%
2340
16th to endDay
11%4245%35%5%6%7%41%
2353
September1st to 15thDay
13%4245%35%45%7%43%
2073
16th to endDay
12%5%2442446%9%43%
1829
October1st to 15thDay
14%7%25%5%34447%40%
1793
16th to endDay
20%8%346%35%46%6%30%
1601
November1st to 15thDay
15%8%35%422346%40%
1582
16th to endDay
20%15%5%8%5%23345%23%
1620
December1st to 15thDay
16%17%8%10%6%3444419%
1525
16th to endDay
22%17%8%9%6%24445%15%
1536
January1st to 15thNight
21%13%5%9%6%34345%22%
2506
16th to endNight
15%14%7%11%8%44445%19%
2667
February1st to 15thNight
16%13%6%9%6%34436%25%
2167
16th to endNight
16%11%6%9%6%34436%26%
1893
March1st to 15thNight
16%10%47%5%3435%5%33%
2120
16th to endNight
16%8%36%7%3435%7%34%
2079
April1st to 15thNight
19%8%245%245%6%7%32%
1797
16th to endNight
17%7%25%3335%46%39%
1656
May1st to 15thNight
20%7%35%5%345%5%7%33%
1620
16th to endNight
12%6%24325%45%8%44%
1600
June1st to 15thNight
9%425%424449%47%
1440
16th to endNight
7%4336%245%6%9%44%
1440
July1st to 15thNight
6%3234245%6%8%52%
1440
16th to endNight
6%3143245%6%9%51%
1534
August1st to 15thNight
5%3145%245%6%10%48%
1620
16th to endNight
10%433324447%50%
1847
September1st to 15thNight
11%324424346%52%
1875
16th to endNight
13%6%14323446%50%
1837
October1st to 15thNight
12%7%25%42335%7%46%
1837
16th to endNight
21%8%26%5%2334436%
2270
November1st to 15thNight
15%9%35%423346%40%
2276
16th to endNight
21%13%5%7%5%23346%24%
2340
December1st to 15thNight
21%16%7%7%7%34335%19%
2433
16th to endNight
23%15%6%9%6%35%445%14%
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
19%15%6%11%5%34335%19%
1432
16th to endDay
13%17%11%11%7%46%33414%
1556
February1st to 15thDay
14%15%8%11%7%3445%5%20%
1690
16th to endDay
16%14%7%11%6%45%45%5%18%
1580
March1st to 15thDay
18%11%5%8%6%35%347%25%
1827
16th to endDay
19%9%46%5%34445%30%
2155
April1st to 15thDay
20%10%45%5%24346%32%
2151
16th to endDay
17%7%35%5%24347%37%
2304
May1st to 15thDay
20%8%26%5%2445%7%31%
2331
16th to endDay
12%5%25%5%35%46%7%39%
2511
June1st to 15thDay
11%5%25%5%35%46%8%42%
2520
16th to endDay
10%5%25%5%36%6%6%9%38%
2520
July1st to 15thDay
8%425%5%45%45%9%44%
2520
16th to endDay
7%4245%35%6%7%10%42%
2633
August1st to 15thDay
7%3245%36%5%7%9%43%
2340
16th to endDay
11%4245%45%5%5%8%42%
2353
September1st to 15thDay
13%4345%35%45%6%44%
2073
16th to endDay
12%5%144245%5%8%44%
1829
October1st to 15thDay
15%7%25%5%24447%40%
1793
16th to endDay
21%8%346%35%36%6%30%
1601
November1st to 15thDay
15%8%36%423446%40%
1582
16th to endDay
20%15%48%6%24345%23%
1620
December1st to 15thDay
17%17%8%10%6%3444419%
1525
16th to endDay
22%17%8%9%6%24345%15%
1536
January1st to 15thNight
21%13%5%9%6%34345%22%
2506
16th to endNight
15%14%8%10%8%44445%19%
2667
February1st to 15thNight
16%13%6%9%5%35%436%25%
2160
16th to endNight
16%12%6%9%6%34435%26%
1893
March1st to 15thNight
17%10%46%43435%5%33%
2133
16th to endNight
16%8%36%6%3435%6%34%
2079
April1st to 15thNight
19%8%245%2445%8%32%
1797
16th to endNight
18%6%25%324446%39%
1656
May1st to 15thNight
20%6%35%5%245%5%7%33%
1619
16th to endNight
12%6%2432445%8%44%
1600
June1st to 15thNight
9%425%32445%9%47%
1440
16th to endNight
8%4346%25%5%6%9%44%
1440
July1st to 15thNight
6%3233245%5%8%52%
1440
16th to endNight
5%3143245%6%9%52%
1534
August1st to 15thNight
5%3145%25%5%6%10%49%
1620
16th to endNight
11%424324447%50%
1847
September1st to 15thNight
11%324424346%52%
1875
16th to endNight
13%5%13323346%50%
1837
October1st to 15thNight
13%6%245%23347%46%
1837
16th to endNight
22%8%26%5%2334436%
2270
November1st to 15thNight
15%9%35%5%23346%40%
2276
16th to endNight
21%14%47%5%2335%6%24%
2340
December1st to 15thNight
21%16%7%7%6%3434419%
2433
16th to endNight
23%16%6%8%6%45%445%14%
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
67%5%12%9%3
1433
16th to endDay
73%5%11%6%3
1556
February1st to 15thDay
66%5%10%11%6%
1692
16th to endDay
66%6%10%12%4
1580
March1st to 15thDay
59%5%12%14%7%
1827
16th to endDay
54%5%13%19%5%
2156
April1st to 15thDay
53%5%10%19%11%
2151
16th to endDay
47%5%13%17%12%3
2304
May1st to 15thDay
52%6%12%19%8%
2331
16th to endDay
41%8%11%23%12%1
2515
June1st to 15thDay
38%6%11%24%17%
2520
16th to endDay
39%9%14%18%16%1
2520
July1st to 15thDay
37%6%11%21%19%2
2371
16th to endDay
32%9%17%22%15%2
2467
August1st to 15thDay
34%8%14%24%16%1
2327
16th to endDay
38%7%13%21%15%3
2353
September1st to 15thDay
38%6%13%21%17%2
2073
16th to endDay
37%5%12%24%18%1
1829
October1st to 15thDay
43%5%11%23%15%1
1793
16th to endDay
52%5%14%18%8%
1601
November1st to 15thDay
44%5%10%22%15%1
1582
16th to endDay
63%5%11%15%3
1620
December1st to 15thDay
67%6%8%13%3
1525
16th to endDay
72%5%12%7%2
1536
January1st to 15thNight
64%5%11%13%5%
2506
16th to endNight
66%5%13%11%3
2667
February1st to 15thNight
60%5%12%14%5%
2169
16th to endNight
60%412%16%5%
1893
March1st to 15thNight
52%413%17%9%1
2133
16th to endNight
50%5%11%22%8%1
2079
April1st to 15thNight
48%6%11%18%14%
1797
16th to endNight
45%5%10%19%16%3
1656
May1st to 15thNight
50%7%11%20%9%1
1620
16th to endNight
38%6%15%22%14%2
1602
June1st to 15thNight
33%6%12%27%17%1
1440
16th to endNight
34%9%16%20%16%1
1440
July1st to 15thNight
28%8%13%25%19%3
1360
16th to endNight
27%8%15%24%19%4
1437
August1st to 15thNight
28%8%12%26%21%2
1609
16th to endNight
33%6%10%23%21%4
1847
September1st to 15thNight
32%5%10%27%20%3
1875
16th to endNight
34%49%28%21%1
1837
October1st to 15thNight
37%410%26%19%
1837
16th to endNight
50%411%22%9%
2270
November1st to 15thNight
44%410%22%14%2
2276
16th to endNight
60%5%11%17%5%
2340
December1st to 15thNight
68%5%9%12%4
2433
16th to endNight
71%6%9%9%3
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
21%16%38%12%11%
90
16th to endDay
32%9%37%15%41
96
February1st to 15thDay
22%18%40%12%6%
90
16th to endDay
18%14%33%23%9%
81
March1st to 15thDay
29%17%29%19%5%
117
16th to endDay
31%6%29%21%9%2
288
April1st to 15thDay
27%9%30%23%7%1
270
16th to endDay
21%8%32%18%12%6%
270
May1st to 15thDay
25%9%24%23%11%5%
288
16th to endDay
18%8%23%25%16%7%
411
June1st to 15thDay
12%5%26%33%16%6%
495
16th to endDay
12%6%29%27%16%6%
495
July1st to 15thDay
10%224%30%20%11%
475
16th to endDay
7%218%33%23%13%
493
August1st to 15thDay
10%14%28%27%19%
313
16th to endDay
16%313%24%28%13%
332
September1st to 15thDay
13%317%22%29%13%
315
16th to endDay
16%5%9%27%30%9%
259
October1st to 15thDay
15%7%23%31%16%5%
255
16th to endDay
25%9%30%28%5%
113
November1st to 15thDay
7%12%24%34%15%5%
90
16th to endDay
28%8%43%13%5%
90
December1st to 15thDay
23%24%34%13%4
90
16th to endDay
27%25%38%8%1
96
January1st to 15thNight
26%14%35%19%4
900
16th to endNight
20%13%36%25%4
939
February1st to 15thNight
24%9%39%23%3
704
16th to endNight
20%11%36%26%4
631
March1st to 15thNight
23%9%33%24%8%
720
16th to endNight
20%7%32%30%7%
735
April1st to 15thNight
22%9%32%27%6%
539
16th to endNight
21%6%34%26%9%1
540
May1st to 15thNight
23%428%33%9%
540
16th to endNight
16%424%36%17%1
563
June1st to 15thNight
10%127%44%16%
540
16th to endNight
10%123%39%23%1
540
July1st to 15thNight
7%117%45%25%2
510
16th to endNight
7%114%39%34%2
564
August1st to 15thNight
7%11%46%28%5%
539
16th to endNight
12%112%32%34%5%
573
September1st to 15thNight
13%117%33%29%4
615
16th to endNight
15%417%31%27%3
665
October1st to 15thNight
16%6%24%33%18%1
660
16th to endNight
25%13%29%22%8%
704
November1st to 15thNight
19%10%31%26%10%1
700
16th to endNight
27%12%27%25%6%
720
December1st to 15thNight
29%13%32%20%4
813
16th to endNight
30%12%35%17%3
960
Page generated at 2017-09-18 08:38:29. Version ac04

Copyright 2017 A. Danko


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