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 2018-03-11.

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
39%
16500
15%
49226
10%
16461
44%
16461
21%
34284

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
20%
972
10%
2716
4%
970
25%
970
14%
2119
January16th to endNight
20%
874
8%
2746
3%
874
25%
874
10%
2184
February1st to 15thNight
22%
761
9%
2456
4%
761
28%
761
12%
1892
February16th to endNight
25%
683
13%
2049
6%
683
31%
683
14%
1533
March1st to 15thNight
30%
764
14%
2193
9%
764
34%
764
18%
1589
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%
681
23%
1941
18%
681
64%
681
33%
1177
September16th to endNight
61%
717
25%
1980
19%
717
65%
717
33%
1230
October1st to 15thNight
47%
720
19%
2076
17%
720
51%
720
26%
1369
October16th to endNight
29%
768
17%
2385
11%
768
39%
768
19%
1632
November1st to 15thNight
38%
760
19%
2471
17%
760
44%
760
23%
1605
November16th to endNight
27%
780
15%
2584
10%
780
34%
780
15%
1858
December1st to 15thNight
20%
780
9%
2730
4%
780
27%
780
10%
2112
December16th to endNight
16%
998
7%
2925
2%
998
21%
998
10%
2449

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%33%
49341
Night
15%8%36%5%3445%6%36%
49408
Cloud CoverDay
13%7%36%6%35%5%5%7%35%
49351
Night
15%8%36%5%3445%6%35%
49412
TransparencyDay
46%7%13%20%11%1
49041
Night
48%6%12%20%11%1
49226
SeeingDay
16%5%23%28%18%7%
6322
Night
19%6%27%30%14%2
16507

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%49%8%45%446%17%
1552
16th to endDay
16%15%7%9%8%45%5%35%17%
1827
February1st to 15thDay
16%12%5%10%8%46%445%21%
1733
16th to endDay
17%11%5%10%7%36%346%22%
1710
March1st to 15thDay
18%11%5%8%6%24345%27%
1991
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%
2007
16th to endDay
11%425%4246%5%8%42%
1980
October1st to 15thDay
14%5%26%5%34346%41%
1884
16th to endDay
19%8%25%6%3445%6%33%
1838
November1st to 15thDay
14%6%35%5%35%45%6%39%
1717
16th to endDay
17%11%36%5%45%45%7%28%
1703
December1st to 15thDay
16%12%6%10%6%35%45%6%21%
1560
16th to endDay
20%14%6%11%8%34345%14%
1641
January1st to 15thNight
22%13%37%5%34346%24%
2716
16th to endNight
15%13%7%9%7%45%45%422%
2746
February1st to 15thNight
16%13%5%10%6%34345%25%
2454
16th to endNight
17%10%5%8%6%34445%28%
2049
March1st to 15thNight
18%9%46%5%3445%5%33%
2181
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%5%2342435%7%51%
1941
16th to endNight
12%4245%2445%6%48%
1980
October1st to 15thNight
15%5%245%2345%6%43%
2076
16th to endNight
18%8%25%5%34445%37%
2385
November1st to 15thNight
14%7%245%25%45%6%40%
2471
16th to endNight
21%9%35%5%2445%7%29%
2584
December1st to 15thNight
19%12%5%8%6%24446%24%
2730
16th to endNight
22%12%6%9%7%35%5%45%17%
2925

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%
1552
16th to endDay
17%14%6%9%9%45%45%5%18%
1827
February1st to 15thDay
16%12%5%9%7%45%5%5%5%22%
1733
16th to endDay
16%10%5%9%8%46%346%24%
1710
March1st to 15thDay
18%11%46%7%34346%27%
2002
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%
2007
16th to endDay
12%4243245%6%8%44%
1980
October1st to 15thDay
14%5%26%5%34347%41%
1884
16th to endDay
20%7%35%5%35%446%34%
1838
November1st to 15thDay
13%8%35%5%2445%7%39%
1717
16th to endDay
16%10%37%6%35%45%6%29%
1703
December1st to 15thDay
17%12%6%10%6%46%446%20%
1560
16th to endDay
19%14%6%11%8%35%45%7%14%
1641
January1st to 15thNight
22%12%47%5%24446%25%
2716
16th to endNight
15%14%6%9%7%45%445%21%
2746
February1st to 15thNight
16%12%5%9%6%45%435%25%
2447
16th to endNight
18%11%5%8%6%34346%28%
2049
March1st to 15thNight
18%10%46%5%34445%32%
2193
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%3245%24446%51%
1941
16th to endNight
12%42442445%6%49%
1980
October1st to 15thNight
16%5%345%3345%6%42%
2076
16th to endNight
19%7%35%443345%37%
2385
November1st to 15thNight
15%7%25%425%45%7%40%
2471
16th to endNight
22%9%45%43435%7%28%
2584
December1st to 15thNight
20%12%5%7%6%25%35%6%23%
2730
16th to endNight
22%13%5%10%7%345%45%18%
2925

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%4
1553
16th to endDay
65%7%12%9%4
1827
February1st to 15thDay
62%6%10%14%5%
1735
16th to endDay
60%6%12%15%41
1710
March1st to 15thDay
57%6%12%17%5%
2002
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%13%
2007
16th to endDay
35%8%12%28%14%
1980
October1st to 15thDay
42%6%12%23%14%1
1884
16th to endDay
50%5%14%19%9%
1838
November1st to 15thDay
43%7%13%21%12%1
1717
16th to endDay
54%5%15%18%6%
1703
December1st to 15thDay
63%7%11%12%5%
1560
16th to endDay
68%7%10%9%3
1641
January1st to 15thNight
60%6%12%14%7%
2716
16th to endNight
64%5%12%12%4
2746
February1st to 15thNight
61%5%11%14%6%1
2456
16th to endNight
57%5%10%19%6%
2049
March1st to 15thNight
53%411%18%10%1
2193
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
1941
16th to endNight
34%6%10%29%17%1
1980
October1st to 15thNight
41%6%12%20%17%1
2076
16th to endNight
48%5%13%22%9%
2385
November1st to 15thNight
43%5%13%22%13%1
2471
16th to endNight
55%413%20%6%
2584
December1st to 15thNight
61%6%11%13%6%
2730
16th to endNight
68%6%10%10%3
2925

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%8%37%23%7%1
135
16th to endDay
33%8%33%23%1
144
February1st to 15thDay
25%13%37%22%2
135
16th to endDay
23%13%35%22%5%
120
March1st to 15thDay
26%11%27%25%8%
218
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%216%22%30%16%
315
16th to endDay
15%411%19%30%18%
314
October1st to 15thDay
15%5%19%27%21%9%
315
16th to endDay
24%5%30%30%7%1
254
November1st to 15thDay
19%9%17%28%21%3
135
16th to endDay
21%16%32%24%5%
123
December1st to 15thDay
18%20%35%17%7%
90
16th to endDay
26%18%36%16%1
130
January1st to 15thNight
27%9%33%22%6%
975
16th to endNight
20%10%37%26%5%
874
February1st to 15thNight
25%6%36%27%3
764
16th to endNight
23%6%34%30%4
683
March1st to 15thNight
23%7%30%30%8%
764
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
11%415%31%30%6%
681
16th to endNight
15%214%29%31%7%
717
October1st to 15thNight
18%5%23%28%18%5%
720
16th to endNight
24%8%32%25%7%
768
November1st to 15thNight
18%7%28%29%13%1
760
16th to endNight
26%11%28%22%9%
780
December1st to 15thNight
25%11%35%21%5%
780
16th to endNight
28%8%36%22%5%
998
Page generated at 2018-03-12 13:28:03. Version ac04

Copyright 2018 A. Danko


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