Lake Erie Metropark
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Lake Erie Metropark clear sky chart from 2005-11-05 to

2017-09-12
.

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
40%
15748
15%
46926
10%
15709
45%
15709
21%
32676

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%
897
10%
2506
4%
895
23%
895
13%
1973
January16th to endNight
20%
807
9%
2535
3%
807
26%
807
10%
2026
February1st to 15thNight
23%
701
9%
2263
4%
701
29%
701
13%
1738
February16th to endNight
25%
631
14%
1893
6%
631
32%
631
15%
1411
March1st to 15thNight
30%
720
14%
2065
9%
720
34%
720
18%
1505
March16th to endNight
37%
768
18%
2112
11%
768
42%
768
23%
1484
April1st to 15thNight
34%
607
14%
1823
8%
607
40%
607
20%
1274
April16th to endNight
42%
540
19%
1620
8%
540
51%
540
25%
1063
May1st to 15thNight
41%
540
13%
1620
9%
540
46%
540
21%
1132
May16th to endNight
52%
562
16%
1684
12%
561
57%
561
28%
1067
June1st to 15thNight
57%
506
15%
1448
13%
506
61%
506
30%
928
June16th to endNight
60%
533
17%
1433
13%
533
63%
533
32%
926
July1st to 15thNight
68%
510
16%
1360
15%
510
69%
510
38%
832
July16th to endNight
71%
564
18%
1537
17%
531
73%
531
40%
863
August1st to 15thNight
69%
539
21%
1609
17%
536
72%
536
35%
955
August16th to endNight
66%
573
22%
1728
18%
573
69%
573
35%
1011
September1st to 15thNight
60%
668
23%
1905
18%
668
64%
668
34%
1148
September16th to endNight
60%
657
24%
1815
18%
657
64%
657
33%
1135
October1st to 15thNight
47%
660
20%
1903
17%
660
51%
660
27%
1241
October16th to endNight
28%
704
15%
2186
8%
704
37%
704
19%
1506
November1st to 15thNight
39%
700
20%
2276
18%
700
44%
700
23%
1463
November16th to endNight
27%
720
14%
2385
10%
720
33%
720
14%
1742
December1st to 15thNight
19%
720
8%
2520
4%
720
26%
720
10%
1980
December16th to endNight
16%
921
7%
2700
2%
921
21%
921
9%
2273

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
13%8%36%6%35%45%7%33%
47673
Night
15%8%36%5%3445%6%36%
47108
Cloud CoverDay
13%7%36%6%35%5%5%7%35%
47683
Night
15%8%36%5%3445%6%36%
47112
TransparencyDay
46%7%13%20%11%1
47373
Night
48%6%12%20%11%1
46926
SeeingDay
15%5%23%28%19%7%
5758
Night
19%6%26%30%15%2
15755

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%15%49%8%45%445%18%
1432
16th to endDay
16%15%8%9%9%45%5%35%16%
1686
February1st to 15thDay
15%12%5%10%8%46%445%21%
1596
16th to endDay
15%11%5%10%7%46%346%22%
1580
March1st to 15thDay
18%11%5%8%7%34345%27%
1882
16th to endDay
18%10%5%7%5%34346%30%
2112
April1st to 15thDay
18%9%36%6%25%446%30%
2136
16th to endDay
17%7%36%5%24346%37%
2340
May1st to 15thDay
17%8%36%7%3446%6%31%
2331
16th to endDay
12%5%25%6%345%5%8%40%
2431
June1st to 15thDay
10%5%25%6%35%5%5%8%40%
2475
16th to endDay
9%5%35%6%46%6%7%10%35%
2520
July1st to 15thDay
7%425%5%36%5%5%8%43%
2520
16th to endDay
7%426%6%45%5%6%9%41%
2522
August1st to 15thDay
7%425%6%46%6%5%9%40%
2340
16th to endDay
10%4245%36%5%7%8%40%
2471
September1st to 15thDay
10%5%345%25%46%7%42%
1963
16th to endDay
12%425%4345%6%8%41%
1815
October1st to 15thDay
14%5%26%5%34346%42%
1727
16th to endDay
20%8%25%6%3445%6%32%
1685
November1st to 15thDay
14%6%35%5%3445%6%41%
1582
16th to endDay
17%11%36%5%45%45%7%27%
1572
December1st to 15thDay
17%12%7%9%6%35%45%6%20%
1440
16th to endDay
20%14%7%11%8%34345%14%
1515
January1st to 15thNight
22%13%47%5%34346%24%
2506
16th to endNight
15%14%7%9%7%36%44421%
2535
February1st to 15thNight
16%13%5%10%6%34445%25%
2261
16th to endNight
16%10%5%8%7%34446%29%
1893
March1st to 15thNight
18%9%46%5%3445%5%32%
2053
16th to endNight
14%8%36%6%34446%36%
2112
April1st to 15thNight
18%8%35%43445%6%34%
1823
16th to endNight
14%6%24425%5%6%7%38%
1620
May1st to 15thNight
18%6%36%5%245%5%7%34%
1620
16th to endNight
12%436%5%2345%8%42%
1682
June1st to 15thNight
10%426%5%345%6%7%43%
1448
16th to endNight
9%415%4445%6%9%43%
1433
July1st to 15thNight
7%32342445%7%53%
1440
16th to endNight
4315%32446%9%53%
1644
August1st to 15thNight
44145%45%6%8%8%48%
1620
16th to endNight
9%3144345%47%51%
1728
September1st to 15thNight
9%42342435%7%51%
1905
16th to endNight
12%4245%2435%6%48%
1815
October1st to 15thNight
15%5%245%2345%6%44%
1903
16th to endNight
18%8%36%5%34445%36%
2186
November1st to 15thNight
14%7%245%25%46%6%41%
2276
16th to endNight
22%9%35%5%2445%7%28%
2385
December1st to 15thNight
20%12%5%8%6%24446%23%
2520
16th to endNight
23%12%6%9%6%35%5%45%17%
2700

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%13%48%8%45%46%6%18%
1432
16th to endDay
16%15%7%9%9%45%45%5%17%
1686
February1st to 15thDay
15%12%6%9%8%45%5%5%5%22%
1596
16th to endDay
15%9%5%9%8%5%6%346%24%
1580
March1st to 15thDay
19%11%46%7%3435%6%26%
1893
16th to endDay
18%8%37%6%3445%6%30%
2111
April1st to 15thDay
17%8%46%6%35%5%5%6%31%
2136
16th to endDay
16%6%36%5%245%46%39%
2340
May1st to 15thDay
16%7%36%6%35%5%5%7%33%
2331
16th to endDay
10%5%35%5%35%5%6%7%42%
2431
June1st to 15thDay
9%5%245%45%6%6%8%41%
2475
16th to endDay
8%4246%46%7%8%9%37%
2520
July1st to 15thDay
7%325%5%36%5%5%8%47%
2520
16th to endDay
7%3245%35%5%6%10%44%
2522
August1st to 15thDay
7%425%5%35%7%5%9%42%
2340
16th to endDay
9%324435%5%7%9%43%
2471
September1st to 15thDay
11%5%25%4345%6%6%45%
1963
16th to endDay
13%5%244245%6%8%42%
1815
October1st to 15thDay
14%5%25%6%34348%41%
1727
16th to endDay
21%7%345%35%446%33%
1685
November1st to 15thDay
12%8%35%5%2445%7%41%
1582
16th to endDay
17%11%37%6%35%45%6%27%
1572
December1st to 15thDay
18%11%6%10%6%47%446%19%
1440
16th to endDay
19%13%6%11%8%35%446%14%
1515
January1st to 15thNight
23%12%47%5%24435%25%
2506
16th to endNight
15%14%7%9%7%45%44421%
2535
February1st to 15thNight
16%12%6%9%6%45%335%26%
2254
16th to endNight
17%10%5%8%7%34346%28%
1893
March1st to 15thNight
18%10%46%5%34446%31%
2065
16th to endNight
15%6%36%5%3445%7%36%
2112
April1st to 15thNight
18%8%35%435%45%6%33%
1823
16th to endNight
14%6%344346%6%7%38%
1620
May1st to 15thNight
18%5%36%5%3445%8%34%
1619
16th to endNight
12%426%5%2345%7%43%
1682
June1st to 15thNight
11%326%425%6%5%8%43%
1448
16th to endNight
9%3245%35%6%7%9%42%
1433
July1st to 15thNight
7%324415%5%47%53%
1440
16th to endNight
5%32342445%9%53%
1644
August1st to 15thNight
44125%45%5%8%9%48%
1620
16th to endNight
10%324424447%51%
1728
September1st to 15thNight
10%3145%24447%51%
1905
16th to endNight
13%425%42445%6%48%
1815
October1st to 15thNight
15%42443345%6%44%
1903
16th to endNight
19%7%35%443346%36%
2186
November1st to 15thNight
14%6%25%425%447%41%
2276
16th to endNight
23%9%45%43435%7%27%
2385
December1st to 15thNight
20%13%6%7%6%25%35%6%22%
2520
16th to endNight
23%13%5%10%7%345%4417%
2700

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
65%7%11%11%3
1433
16th to endDay
66%8%11%8%4
1686
February1st to 15thDay
62%6%10%14%5%
1598
16th to endDay
60%6%12%15%41
1580
March1st to 15thDay
58%6%12%16%5%1
1893
16th to endDay
52%7%10%21%7%
2112
April1st to 15thDay
51%7%10%18%12%
2136
16th to endDay
44%6%12%19%13%3
2340
May1st to 15thDay
47%8%12%19%10%2
2331
16th to endDay
38%8%12%25%12%2
2435
June1st to 15thDay
36%9%14%24%13%1
2475
16th to endDay
37%11%15%18%16%1
2520
July1st to 15thDay
32%8%12%24%19%2
2371
16th to endDay
32%8%16%25%15%2
2366
August1st to 15thDay
33%9%16%25%13%1
2327
16th to endDay
33%9%16%23%15%2
2471
September1st to 15thDay
35%7%15%25%14%
1963
16th to endDay
36%8%12%28%13%
1815
October1st to 15thDay
42%6%12%23%13%1
1727
16th to endDay
50%5%15%18%8%
1685
November1st to 15thDay
42%7%13%22%13%1
1582
16th to endDay
55%5%14%18%5%
1572
December1st to 15thDay
64%7%11%11%4
1440
16th to endDay
69%6%10%9%3
1515
January1st to 15thNight
61%6%11%14%6%
2506
16th to endNight
65%5%12%12%4
2535
February1st to 15thNight
60%5%11%15%5%
2263
16th to endNight
57%5%11%19%6%
1893
March1st to 15thNight
53%5%11%17%10%1
2065
16th to endNight
47%5%11%22%10%1
2112
April1st to 15thNight
49%5%10%19%14%
1823
16th to endNight
41%6%13%18%16%3
1620
May1st to 15thNight
47%6%12%18%11%2
1620
16th to endNight
38%6%11%25%15%2
1684
June1st to 15thNight
36%7%10%28%15%
1448
16th to endNight
35%8%13%22%18%1
1433
July1st to 15thNight
29%8%11%28%20%2
1360
16th to endNight
26%7%16%24%21%3
1537
August1st to 15thNight
28%9%12%29%16%2
1609
16th to endNight
32%5%14%25%18%3
1728
September1st to 15thNight
33%5%12%27%19%2
1905
16th to endNight
35%5%10%29%16%1
1815
October1st to 15thNight
39%6%13%20%18%1
1903
16th to endNight
49%5%14%22%7%
2186
November1st to 15thNight
42%5%12%22%14%1
2276
16th to endNight
56%412%19%6%
2385
December1st to 15thNight
63%6%11%13%5%
2520
16th to endNight
69%6%10%9%3
2700

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%11%37%22%7%1
90
16th to endDay
34%10%26%28%1
96
February1st to 15thDay
18%15%41%22%2
90
16th to endDay
17%12%35%25%8%
81
March1st to 15thDay
26%13%26%24%9%
183
16th to endDay
20%432%29%10%2
288
April1st to 15thDay
20%8%29%29%10%1
270
16th to endDay
20%431%24%11%7%
270
May1st to 15thDay
23%426%24%16%4
288
16th to endDay
14%226%29%18%7%
331
June1st to 15thDay
10%223%39%19%3
450
16th to endDay
12%326%32%19%5%
495
July1st to 15thDay
8%121%33%24%10%
475
16th to endDay
9%212%32%32%11%
382
August1st to 15thDay
9%212%31%28%16%
313
16th to endDay
11%213%24%30%17%
332
September1st to 15thDay
11%217%22%30%16%
299
16th to endDay
17%5%12%20%30%12%
254
October1st to 15thDay
12%5%20%28%23%8%
255
16th to endDay
25%5%31%28%7%
197
November1st to 15thDay
13%11%14%31%26%3
90
16th to endDay
23%19%28%21%7%
82
December1st to 15thDay
18%18%35%23%5%
60
16th to endDay
26%21%36%14%
87
January1st to 15thNight
28%10%33%21%5%
900
16th to endNight
21%11%35%26%5%
807
February1st to 15thNight
24%6%37%27%4
704
16th to endNight
21%6%34%31%4
631
March1st to 15thNight
23%8%29%30%8%
720
16th to endNight
17%5%32%31%11%1
768
April1st to 15thNight
21%6%31%32%6%
607
16th to endNight
17%433%31%11%1
540
May1st to 15thNight
20%326%32%15%1
540
16th to endNight
13%221%36%22%4
563
June1st to 15thNight
11%119%45%20%
506
16th to endNight
11%118%42%22%2
533
July1st to 15thNight
10%112%39%31%5%
510
16th to endNight
6%112%43%31%4
564
August1st to 15thNight
7%113%41%28%7%
539
16th to endNight
12%12%31%36%5%
573
September1st to 15thNight
10%415%31%30%6%
668
16th to endNight
15%214%30%30%5%
657
October1st to 15thNight
17%6%23%28%19%5%
660
16th to endNight
24%9%33%25%6%
704
November1st to 15thNight
17%7%29%29%14%1
700
16th to endNight
27%12%26%23%9%
720
December1st to 15thNight
26%11%35%20%5%
720
16th to endNight
28%8%35%21%5%
921
Page generated at 2017-09-13 07:39:17. Version ac04

Copyright 2017 A. Danko


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