Battle Creek
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Battle Creek clear sky chart from 2005-11-05 to 2017-09-16.

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%
15934
15%
46796
9%
15892
39%
15892
19%
33252

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
14%
900
8%
2506
3%
895
18%
895
10%
2060
January16th to endNight
16%
939
6%
2667
2%
939
19%
939
8%
2268
February1st to 15thNight
18%
701
9%
2196
3%
701
23%
701
10%
1733
February16th to endNight
20%
631
12%
1893
5%
631
27%
631
12%
1444
March1st to 15thNight
26%
720
14%
2123
8%
720
31%
720
17%
1523
March16th to endNight
28%
748
17%
2092
10%
748
35%
748
21%
1471
April1st to 15thNight
25%
539
13%
1797
8%
539
33%
539
18%
1247
April16th to endNight
32%
540
19%
1635
8%
540
41%
540
22%
1094
May1st to 15thNight
32%
540
13%
1620
6%
540
38%
540
20%
1141
May16th to endNight
43%
562
15%
1597
9%
561
48%
561
28%
1023
June1st to 15thNight
49%
540
16%
1440
10%
540
54%
540
34%
903
June16th to endNight
53%
540
15%
1440
10%
540
57%
540
32%
922
July1st to 15thNight
63%
510
16%
1360
13%
510
65%
510
39%
817
July16th to endNight
64%
564
21%
1437
16%
531
66%
531
39%
867
August1st to 15thNight
64%
539
21%
1609
17%
536
68%
536
37%
927
August16th to endNight
62%
573
21%
1817
18%
573
66%
573
32%
1056
September1st to 15thNight
58%
624
26%
1884
23%
624
63%
624
34%
1111
September16th to endNight
55%
661
23%
1826
17%
661
58%
661
32%
1149
October1st to 15thNight
43%
660
23%
1851
16%
660
50%
660
28%
1213
October16th to endNight
25%
704
15%
2263
9%
704
34%
704
16%
1601
November1st to 15thNight
34%
700
19%
2276
16%
700
40%
700
19%
1522
November16th to endNight
21%
720
12%
2340
8%
720
27%
720
12%
1787
December1st to 15thNight
12%
819
7%
2439
2%
819
17%
819
8%
2032
December16th to endNight
12%
960
7%
2688
1%
960
16%
960
7%
2341

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%47%6%35%45%7%32%
47968
Night
15%9%47%6%3445%6%33%
46967
Cloud CoverDay
14%8%47%6%35%45%7%32%
47977
Night
15%9%46%5%3445%6%34%
46972
TransparencyDay
50%6%11%19%11%1
47657
Night
50%5%11%19%11%1
46796
SeeingDay
16%12%28%23%12%5%
5932
Night
19%10%29%27%11%1
15938

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
18%16%7%10%9%46%435%13%
1432
16th to endDay
13%19%10%13%10%45%33411%
1557
February1st to 15thDay
13%15%7%12%10%5%5%42417%
1663
16th to endDay
15%14%7%12%7%45%5%4418%
1580
March1st to 15thDay
14%11%6%8%6%35%5%5%6%26%
1826
16th to endDay
17%9%46%5%34446%32%
2142
April1st to 15thDay
20%11%45%5%24445%30%
2151
16th to endDay
17%7%26%424447%38%
2324
May1st to 15thDay
19%6%37%6%3445%7%30%
2331
16th to endDay
12%7%25%5%25%46%7%39%
2515
June1st to 15thDay
10%5%26%5%35%5%5%8%40%
2520
16th to endDay
10%425%6%45%6%8%10%34%
2520
July1st to 15thDay
6%3245%346%7%9%45%
2520
16th to endDay
7%4245%46%6%7%9%40%
2634
August1st to 15thDay
8%425%6%46%5%7%9%39%
2340
16th to endDay
12%5%26%5%35%46%8%38%
2383
September1st to 15thDay
12%425%5%35%5%47%43%
2064
16th to endDay
12%5%25%5%245%5%8%40%
1824
October1st to 15thDay
14%7%36%6%34446%37%
1777
16th to endDay
22%9%26%435%447%27%
1609
November1st to 15thDay
13%10%36%424346%37%
1582
16th to endDay
17%16%5%10%5%34346%21%
1620
December1st to 15thDay
15%18%10%10%7%3433417%
1518
16th to endDay
20%18%9%12%7%3432412%
1536
January1st to 15thNight
21%14%7%9%8%3444318%
2506
16th to endNight
14%13%8%13%10%5%6%45%5%13%
2667
February1st to 15thNight
14%16%7%10%7%4435%423%
2194
16th to endNight
16%10%410%8%35%45%6%24%
1893
March1st to 15thNight
17%10%47%5%33346%33%
2110
16th to endNight
14%8%37%5%3435%6%35%
2092
April1st to 15thNight
18%9%45%5%3435%6%33%
1797
16th to endNight
16%7%35%42435%6%39%
1635
May1st to 15thNight
19%6%36%5%34447%33%
1620
16th to endNight
12%6%245%24449%43%
1595
June1st to 15thNight
10%5%15%5%2236%8%47%
1440
16th to endNight
7%425%5%35%5%6%10%43%
1440
July1st to 15thNight
5%224335%5%7%8%51%
1440
16th to endNight
5%31442446%8%52%
1534
August1st to 15thNight
6%315%435%46%8%50%
1620
16th to endNight
10%5%25%42435%7%49%
1817
September1st to 15thNight
11%5%13423447%51%
1884
16th to endNight
12%42442445%6%46%
1826
October1st to 15thNight
16%6%34423346%43%
1851
16th to endNight
21%8%36%5%24445%33%
2263
November1st to 15thNight
15%9%45%5%2445%6%37%
2276
16th to endNight
20%13%6%7%5%34445%25%
2340
December1st to 15thNight
20%17%7%10%7%3433417%
2439
16th to endNight
22%17%7%10%7%3434412%
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
18%16%6%10%8%5%5%445%13%
1432
16th to endDay
13%18%10%13%9%5%443412%
1557
February1st to 15thDay
13%14%7%12%10%45%33417%
1663
16th to endDay
15%14%6%12%6%45%5%45%18%
1580
March1st to 15thDay
14%11%5%7%6%446%5%6%26%
1836
16th to endDay
17%10%47%425%446%32%
2141
April1st to 15thDay
21%11%35%5%24345%30%
2151
16th to endDay
17%7%25%425%35%7%38%
2324
May1st to 15thDay
19%7%36%5%3445%7%31%
2331
16th to endDay
13%6%35%4345%6%7%40%
2515
June1st to 15thDay
10%5%26%6%35%5%5%8%40%
2520
16th to endDay
10%425%6%46%6%8%9%35%
2520
July1st to 15thDay
6%3245%35%5%6%9%45%
2520
16th to endDay
7%5%245%46%5%7%10%40%
2634
August1st to 15thDay
8%4245%46%6%6%10%40%
2340
16th to endDay
12%5%26%5%345%5%7%39%
2383
September1st to 15thDay
12%425%425%45%7%43%
2064
16th to endDay
12%5%25%5%345%5%9%40%
1824
October1st to 15thDay
15%7%26%6%34446%37%
1777
16th to endDay
23%9%25%5%35%446%28%
1609
November1st to 15thDay
14%9%35%424346%38%
1582
16th to endDay
18%15%6%9%5%34336%22%
1620
December1st to 15thDay
16%17%10%11%6%33435%18%
1518
16th to endDay
21%18%10%11%7%3433412%
1536
January1st to 15thNight
20%14%6%9%7%3444418%
2506
16th to endNight
14%13%9%12%10%35%45%5%14%
2667
February1st to 15thNight
14%16%6%10%6%4444423%
2187
16th to endNight
16%10%5%9%7%45%45%6%24%
1893
March1st to 15thNight
18%11%36%5%34345%33%
2123
16th to endNight
15%9%37%5%25%35%6%35%
2092
April1st to 15thNight
18%9%35%5%2445%6%32%
1797
16th to endNight
16%8%35%424447%38%
1635
May1st to 15thNight
20%7%25%6%34446%34%
1619
16th to endNight
12%4345%2445%8%43%
1595
June1st to 15thNight
10%425%432448%48%
1440
16th to endNight
8%3345%35%5%5%11%43%
1440
July1st to 15thNight
6%314325%47%8%51%
1440
16th to endNight
5%3244235%6%8%52%
1534
August1st to 15thNight
6%315%4345%6%8%50%
1620
16th to endNight
10%425%42445%7%49%
1817
September1st to 15thNight
11%5%13423347%51%
1884
16th to endNight
11%5%2442345%7%47%
1826
October1st to 15thNight
16%6%25%5%23346%43%
1851
16th to endNight
21%8%26%424446%33%
2263
November1st to 15thNight
15%9%445%2435%6%38%
2276
16th to endNight
20%13%6%7%5%34445%25%
2340
December1st to 15thNight
20%16%7%9%7%4333418%
2439
16th to endNight
22%16%7%10%6%4434413%
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
73%5%10%7%2
1433
16th to endDay
76%5%8%7%2
1557
February1st to 15thDay
70%5%6%12%4
1665
16th to endDay
67%5%9%11%5%
1580
March1st to 15thDay
56%7%11%16%6%
1836
16th to endDay
51%5%11%21%8%
2142
April1st to 15thDay
54%49%19%11%
2151
16th to endDay
45%7%11%17%14%3
2324
May1st to 15thDay
52%5%11%20%8%
2331
16th to endDay
41%6%12%25%13%1
2519
June1st to 15thDay
39%6%10%25%16%1
2520
16th to endDay
40%9%12%21%16%1
2520
July1st to 15thDay
33%7%10%23%21%2
2371
16th to endDay
35%8%13%23%17%2
2468
August1st to 15thDay
37%8%12%25%13%2
2327
16th to endDay
41%6%11%24%14%2
2383
September1st to 15thDay
39%6%11%24%16%1
2064
16th to endDay
39%6%10%26%15%
1824
October1st to 15thDay
46%5%9%24%12%1
1777
16th to endDay
55%5%12%18%6%
1609
November1st to 15thDay
47%412%21%12%1
1582
16th to endDay
64%410%15%3
1620
December1st to 15thDay
68%5%10%12%2
1518
16th to endDay
76%48%7%2
1536
January1st to 15thNight
67%411%11%4
2506
16th to endNight
70%5%12%7%2
2667
February1st to 15thNight
63%5%10%14%41
2196
16th to endNight
59%5%11%17%41
1893
March1st to 15thNight
52%412%18%9%1
2123
16th to endNight
49%412%22%9%1
2092
April1st to 15thNight
50%5%10%19%13%
1797
16th to endNight
45%5%10%18%16%3
1635
May1st to 15thNight
49%5%10%21%10%2
1620
16th to endNight
38%7%12%24%15%2
1597
June1st to 15thNight
34%6%11%28%17%1
1440
16th to endNight
34%8%16%22%16%1
1440
July1st to 15thNight
28%7%13%26%22%2
1360
16th to endNight
27%8%13%25%22%2
1437
August1st to 15thNight
29%6%13%28%20%2
1609
16th to endNight
33%5%10%26%19%4
1817
September1st to 15thNight
32%5%9%29%20%2
1884
16th to endNight
37%49%28%18%1
1826
October1st to 15thNight
42%410%24%18%
1851
16th to endNight
52%5%11%21%8%1
2263
November1st to 15thNight
47%5%10%20%13%2
2276
16th to endNight
61%412%17%4
2340
December1st to 15thNight
70%48%11%4
2439
16th to endNight
74%5%8%9%2
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
18%26%42%11%1
90
16th to endDay
30%17%41%8%2
96
February1st to 15thDay
17%34%38%8%
90
16th to endDay
20%18%39%17%3
81
March1st to 15thDay
30%20%29%15%3
126
16th to endDay
26%13%31%18%7%2
288
April1st to 15thDay
26%11%36%17%7%1
270
16th to endDay
21%16%28%17%10%5%
270
May1st to 15thDay
24%12%30%18%9%4
288
16th to endDay
17%13%28%24%10%5%
415
June1st to 15thDay
12%8%35%28%10%4
495
16th to endDay
14%12%31%25%11%4
495
July1st to 15thDay
9%5%31%29%16%8%
475
16th to endDay
8%5%26%30%20%8%
494
August1st to 15thDay
8%222%25%24%15%
313
16th to endDay
14%6%19%27%20%11%
332
September1st to 15thDay
13%5%17%28%23%11%
315
16th to endDay
15%6%16%28%24%8%
257
October1st to 15thDay
16%10%24%30%12%4
255
16th to endDay
23%21%35%15%3
121
November1st to 15thDay
7%17%33%30%10%1
90
16th to endDay
32%27%28%8%2
90
December1st to 15thDay
25%36%26%8%2
90
16th to endDay
27%43%26%3
96
January1st to 15thNight
26%18%32%18%4
900
16th to endNight
19%14%35%26%3
939
February1st to 15thNight
21%17%35%20%3
704
16th to endNight
20%17%34%22%4
631
March1st to 15thNight
24%14%30%24%5%
720
16th to endNight
18%13%35%25%7%
748
April1st to 15thNight
22%12%35%23%5%
539
16th to endNight
20%10%35%26%5%1
540
May1st to 15thNight
24%6%31%28%7%
540
16th to endNight
16%5%29%32%13%1
563
June1st to 15thNight
12%327%40%15%
540
16th to endNight
9%127%40%18%2
540
July1st to 15thNight
8%120%43%22%2
510
16th to endNight
6%220%41%27%1
564
August1st to 15thNight
8%17%43%25%4
539
16th to endNight
12%114%36%29%5%
573
September1st to 15thNight
14%417%33%24%5%
624
16th to endNight
15%5%18%31%23%4
661
October1st to 15thNight
20%7%24%30%16%1
660
16th to endNight
25%14%29%21%7%
704
November1st to 15thNight
21%11%28%27%9%1
700
16th to endNight
26%15%29%20%5%
720
December1st to 15thNight
29%16%34%15%3
819
16th to endNight
31%14%36%15%2
960
Page generated at 2017-09-17 12:05:43. Version ac04

Copyright 2017 A. Danko


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