Novi Community Sports Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Novi Community Sports Park clear sky chart from 2005-11-05 to 2018-01-12.

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%
16367
15%
48541
10%
16325
43%
16325
21%
33808

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
18%
956
9%
2662
4%
951
23%
951
13%
2087
January16th to endNight
20%
852
8%
2580
4%
852
24%
852
10%
2052
February1st to 15thNight
18%
701
9%
2258
2%
701
24%
701
10%
1744
February16th to endNight
23%
631
13%
1893
5%
631
30%
631
16%
1400
March1st to 15thNight
27%
720
14%
2077
8%
720
32%
720
17%
1516
March16th to endNight
33%
768
18%
2112
10%
768
39%
768
21%
1493
April1st to 15thNight
30%
588
14%
1812
7%
588
37%
588
18%
1259
April16th to endNight
37%
540
19%
1620
8%
540
46%
540
24%
1076
May1st to 15thNight
38%
540
14%
1620
8%
540
43%
540
21%
1124
May16th to endNight
49%
562
15%
1684
10%
561
55%
561
28%
1069
June1st to 15thNight
57%
540
15%
1440
11%
540
61%
540
32%
924
June16th to endNight
57%
540
17%
1440
12%
540
62%
540
34%
917
July1st to 15thNight
64%
510
16%
1360
14%
510
67%
510
39%
812
July16th to endNight
67%
564
19%
1505
16%
531
70%
531
39%
876
August1st to 15thNight
66%
539
20%
1609
16%
536
69%
536
35%
965
August16th to endNight
66%
573
23%
1740
18%
573
70%
573
34%
1030
September1st to 15thNight
59%
668
24%
1928
20%
668
62%
668
35%
1138
September16th to endNight
59%
717
25%
1980
19%
717
63%
717
35%
1216
October1st to 15thNight
47%
720
19%
2068
16%
720
52%
720
27%
1358
October16th to endNight
27%
768
16%
2404
10%
768
36%
768
18%
1684
November1st to 15thNight
36%
760
19%
2471
16%
760
42%
760
22%
1628
November16th to endNight
25%
780
14%
2574
9%
780
32%
780
14%
1851
December1st to 15thNight
20%
790
8%
2740
3%
790
25%
790
10%
2110
December16th to endNight
14%
1040
7%
2964
2%
1040
19%
1040
8%
2479

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%36%6%35%45%7%32%
48778
Night
15%8%36%5%3445%6%35%
48720
Cloud CoverDay
14%8%36%6%35%45%7%32%
48788
Night
15%8%36%5%3445%6%35%
48724
TransparencyDay
49%6%12%19%10%1
48475
Night
47%6%12%20%11%1
48541
SeeingDay
17%8%26%24%15%7%
6190
Night
19%8%28%30%12%1
16371

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%15%6%9%7%45%5%45%17%
1520
16th to endDay
15%18%8%9%7%46%45%5%14%
1643
February1st to 15thDay
14%14%5%11%8%46%445%19%
1602
16th to endDay
15%14%5%10%8%4445%5%21%
1580
March1st to 15thDay
17%11%5%8%6%35%346%28%
1871
16th to endDay
17%9%6%7%6%35%346%29%
2112
April1st to 15thDay
19%10%46%435%346%31%
2145
16th to endDay
16%8%26%5%2435%6%37%
2340
May1st to 15thDay
19%7%36%6%45%45%6%31%
2331
16th to endDay
13%6%25%5%3446%8%39%
2431
June1st to 15thDay
10%5%25%6%446%6%8%39%
2517
16th to endDay
10%5%35%7%36%6%7%11%33%
2520
July1st to 15thDay
7%425%5%35%5%5%9%43%
2520
16th to endDay
9%5%25%5%45%6%6%10%38%
2556
August1st to 15thDay
7%5%26%7%46%5%6%8%38%
2340
16th to endDay
10%5%345%35%6%7%8%38%
2459
September1st to 15thDay
11%5%35%5%35%45%9%40%
2019
16th to endDay
12%6%25%5%245%6%9%40%
1980
October1st to 15thDay
16%6%25%6%345%5%7%38%
1891
16th to endDay
20%9%36%5%34445%32%
1818
November1st to 15thDay
15%8%35%6%3345%5%37%
1717
16th to endDay
17%12%5%7%5%35%436%28%
1712
December1st to 15thDay
16%12%6%10%6%45%345%23%
1547
16th to endDay
22%15%7%11%7%34335%14%
1607
January1st to 15thNight
21%12%5%8%5%34445%24%
2662
16th to endNight
14%13%6%11%7%45%5%5%5%20%
2580
February1st to 15thNight
15%13%5%8%7%44345%26%
2256
16th to endNight
17%10%5%8%7%34446%28%
1893
March1st to 15thNight
18%8%46%6%34446%32%
2065
16th to endNight
15%7%36%5%35%5%46%36%
2112
April1st to 15thNight
18%9%35%43446%6%33%
1812
16th to endNight
15%6%35%325%5%5%6%39%
1620
May1st to 15thNight
17%7%26%5%25%5%5%8%34%
1620
16th to endNight
12%5%25%5%34348%44%
1682
June1st to 15thNight
9%424425%46%8%46%
1440
16th to endNight
8%4244345%7%8%45%
1440
July1st to 15thNight
7%3134245%5%7%52%
1440
16th to endNight
4324425%45%11%50%
1609
August1st to 15thNight
5%3145%35%5%5%8%49%
1620
16th to endNight
10%414423448%51%
1740
September1st to 15thNight
11%42433335%7%51%
1928
16th to endNight
11%42432335%7%49%
1980
October1st to 15thNight
15%6%35%424446%41%
2068
16th to endNight
20%7%35%43445%5%34%
2404
November1st to 15thNight
14%7%35%5%345%5%6%39%
2471
16th to endNight
20%10%46%5%2445%6%30%
2574
December1st to 15thNight
19%12%5%8%6%25%5%45%23%
2740
16th to endNight
22%15%6%9%6%34445%16%
2964

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%15%6%9%8%45%5%46%16%
1520
16th to endDay
14%18%8%9%7%46%45%5%14%
1643
February1st to 15thDay
14%14%5%10%8%36%5%45%19%
1602
16th to endDay
15%14%5%10%8%4445%5%21%
1580
March1st to 15thDay
17%11%48%6%24346%27%
1882
16th to endDay
17%9%6%7%6%34446%29%
2111
April1st to 15thDay
19%10%46%435%346%31%
2145
16th to endDay
16%8%26%5%2435%5%38%
2340
May1st to 15thDay
19%8%36%5%45%447%31%
2331
16th to endDay
13%5%25%5%3446%8%39%
2431
June1st to 15thDay
10%5%25%6%45%5%5%8%39%
2517
16th to endDay
10%5%25%6%46%6%7%10%33%
2520
July1st to 15thDay
7%425%5%35%6%5%9%43%
2520
16th to endDay
8%5%25%5%36%6%6%10%38%
2556
August1st to 15thDay
8%5%25%6%46%6%6%8%38%
2340
16th to endDay
10%5%25%6%35%5%7%8%39%
2459
September1st to 15thDay
11%6%25%5%35%5%5%9%39%
2019
16th to endDay
12%5%25%5%2446%9%40%
1980
October1st to 15thDay
16%5%246%3445%7%37%
1891
16th to endDay
20%9%35%5%34446%32%
1818
November1st to 15thDay
15%7%36%6%24446%37%
1717
16th to endDay
17%12%47%5%35%436%28%
1712
December1st to 15thDay
17%12%7%10%6%44445%23%
1547
16th to endDay
22%15%7%11%7%34335%15%
1607
January1st to 15thNight
21%12%5%8%6%34445%24%
2662
16th to endNight
14%13%7%10%7%45%45%5%20%
2580
February1st to 15thNight
15%13%5%9%7%34445%26%
2249
16th to endNight
17%9%5%8%7%34446%28%
1893
March1st to 15thNight
18%8%46%6%23446%32%
2077
16th to endNight
15%7%36%5%35%5%46%36%
2112
April1st to 15thNight
18%9%245%2445%7%33%
1812
16th to endNight
15%7%35%4245%5%6%39%
1620
May1st to 15thNight
17%7%26%5%25%5%48%35%
1619
16th to endNight
12%5%25%434447%44%
1682
June1st to 15thNight
9%425%425%46%9%45%
1440
16th to endNight
8%5%244345%7%9%44%
1440
July1st to 15thNight
7%3233245%6%7%52%
1440
16th to endNight
33245%25%45%10%51%
1609
August1st to 15thNight
5%3246%36%45%9%49%
1620
16th to endNight
10%414433447%51%
1740
September1st to 15thNight
11%41432435%7%51%
1928
16th to endNight
11%5%2442435%7%49%
1980
October1st to 15thNight
15%6%2442445%6%42%
2068
16th to endNight
20%7%35%43445%5%34%
2404
November1st to 15thNight
14%7%35%5%245%5%6%39%
2471
16th to endNight
20%10%45%5%2435%6%29%
2574
December1st to 15thNight
19%13%5%8%6%25%5%45%23%
2740
16th to endNight
22%15%6%9%6%34445%16%
2964

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%6%11%10%4
1521
16th to endDay
70%6%9%8%4
1643
February1st to 15thDay
65%7%9%12%5%
1604
16th to endDay
63%5%11%13%5%
1580
March1st to 15thDay
57%6%12%16%6%1
1882
16th to endDay
55%6%10%19%6%1
2112
April1st to 15thDay
53%6%10%18%10%
2145
16th to endDay
46%5%13%16%14%2
2340
May1st to 15thDay
52%5%11%18%9%2
2331
16th to endDay
42%6%12%23%12%2
2435
June1st to 15thDay
40%7%13%23%13%1
2517
16th to endDay
41%9%14%19%14%1
2520
July1st to 15thDay
36%7%11%23%18%2
2371
16th to endDay
38%9%14%21%14%2
2397
August1st to 15thDay
39%8%13%24%11%1
2327
16th to endDay
40%8%11%22%15%1
2459
September1st to 15thDay
40%6%14%25%12%
2019
16th to endDay
37%6%13%29%13%
1980
October1st to 15thDay
43%5%13%23%11%2
1891
16th to endDay
53%5%14%17%8%
1818
November1st to 15thDay
47%5%12%22%11%1
1717
16th to endDay
56%5%12%18%6%
1712
December1st to 15thDay
63%5%12%13%4
1547
16th to endDay
72%5%11%7%2
1607
January1st to 15thNight
61%5%12%13%6%
2662
16th to endNight
64%5%12%12%4
2580
February1st to 15thNight
60%6%11%14%6%
2258
16th to endNight
56%413%17%6%
1893
March1st to 15thNight
52%6%11%17%10%1
2077
16th to endNight
47%6%12%22%10%1
2112
April1st to 15thNight
48%6%10%19%14%
1812
16th to endNight
42%6%12%17%17%3
1620
May1st to 15thNight
47%6%11%20%12%2
1620
16th to endNight
38%6%13%23%14%3
1684
June1st to 15thNight
35%7%12%27%15%1
1440
16th to endNight
33%7%14%24%17%1
1440
July1st to 15thNight
28%7%11%29%20%2
1360
16th to endNight
27%8%16%24%20%3
1505
August1st to 15thNight
30%7%13%30%14%2
1609
16th to endNight
32%6%12%28%17%2
1740
September1st to 15thNight
32%5%11%29%19%1
1928
16th to endNight
33%5%12%29%17%
1980
October1st to 15thNight
41%5%12%22%16%
2068
16th to endNight
49%6%12%22%8%
2404
November1st to 15thNight
44%6%12%23%12%1
2471
16th to endNight
54%5%13%18%7%
2574
December1st to 15thNight
61%6%13%12%6%
2740
16th to endNight
69%5%11%9%3
2964

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
17%15%41%19%4
123
16th to endDay
31%12%39%13%3
96
February1st to 15thDay
22%18%46%12%
90
16th to endDay
20%17%40%18%2
81
March1st to 15thDay
31%11%27%21%7%
172
16th to endDay
22%9%30%26%8%2
288
April1st to 15thDay
21%12%30%23%9%1
270
16th to endDay
22%10%32%14%12%7%
270
May1st to 15thDay
23%6%29%22%12%4
288
16th to endDay
16%10%22%26%15%8%
331
June1st to 15thDay
12%5%31%32%13%4
492
16th to endDay
13%7%32%28%13%5%
495
July1st to 15thDay
12%5%24%29%19%9%
475
16th to endDay
9%422%27%23%11%
416
August1st to 15thDay
9%216%28%23%19%
313
16th to endDay
15%313%23%25%17%
332
September1st to 15thDay
12%320%19%28%15%
315
16th to endDay
16%314%20%28%15%
314
October1st to 15thDay
21%5%21%25%19%7%
315
16th to endDay
23%10%30%27%7%
234
November1st to 15thDay
17%11%28%25%14%2
135
16th to endDay
21%20%33%18%5%
124
December1st to 15thDay
18%25%35%12%7%
90
16th to endDay
30%23%34%9%2
131
January1st to 15thNight
27%12%33%20%5%
956
16th to endNight
19%12%35%26%5%
852
February1st to 15thNight
24%12%35%24%3
704
16th to endNight
22%10%33%29%3
631
March1st to 15thNight
23%10%31%26%6%
720
16th to endNight
17%10%31%29%9%1
768
April1st to 15thNight
21%12%30%29%5%
588
16th to endNight
19%7%31%30%8%1
540
May1st to 15thNight
19%5%29%34%9%1
540
16th to endNight
14%324%36%18%2
563
June1st to 15thNight
10%222%50%13%
540
16th to endNight
9%224%42%19%
540
July1st to 15thNight
10%117%41%26%3
510
16th to endNight
4118%47%23%3
564
August1st to 15thNight
7%117%42%27%4
539
16th to endNight
12%113%34%35%3
573
September1st to 15thNight
13%418%29%28%5%
668
16th to endNight
13%316%31%28%5%
717
October1st to 15thNight
18%6%22%30%18%3
720
16th to endNight
24%10%34%25%5%
768
November1st to 15thNight
18%9%30%27%12%1
760
16th to endNight
26%14%29%21%7%
780
December1st to 15thNight
27%11%34%21%5%
790
16th to endNight
29%10%37%19%3
1040
Page generated at 2018-01-12 22:01:28. Version ac04

Copyright 2018 A. Danko


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