Youngstown
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Youngstown 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
36%
15836
14%
49171
10%
15798
40%
15798
18%
34889

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%
777
9%
2522
4%
776
20%
776
9%
2029
January16th to endNight
16%
832
9%
2704
4%
832
22%
832
9%
2176
February1st to 15thNight
16%
762
9%
2482
4%
761
21%
761
8%
2003
February16th to endNight
18%
683
10%
2110
4%
683
25%
683
11%
1650
March1st to 15thNight
25%
764
14%
2105
8%
764
31%
764
15%
1607
March16th to endNight
27%
768
17%
2112
10%
768
33%
768
21%
1509
April1st to 15thNight
26%
718
12%
1866
4%
718
31%
718
19%
1378
April16th to endNight
36%
552
19%
1632
9%
552
43%
552
25%
1075
May1st to 15thNight
41%
540
13%
1620
9%
540
46%
540
21%
1155
May16th to endNight
55%
477
17%
1600
16%
477
58%
477
26%
990
June1st to 15thNight
52%
360
16%
1440
17%
360
60%
360
24%
836
June16th to endNight
53%
360
16%
1440
21%
360
58%
360
21%
854
July1st to 15thNight
62%
448
14%
1468
14%
448
64%
448
27%
918
July16th to endNight
65%
564
16%
1595
14%
531
68%
531
33%
961
August1st to 15thNight
69%
539
20%
1609
16%
536
70%
536
35%
947
August16th to endNight
64%
615
22%
1761
17%
615
66%
615
34%
1058
September1st to 15thNight
59%
720
24%
1879
16%
720
62%
720
34%
1192
September16th to endNight
56%
717
24%
1980
19%
717
58%
717
30%
1265
October1st to 15thNight
45%
720
18%
2145
16%
720
49%
720
26%
1399
October16th to endNight
29%
768
17%
2304
12%
768
37%
768
18%
1634
November1st to 15thNight
39%
760
19%
2435
16%
760
45%
760
22%
1607
November16th to endNight
22%
780
12%
2730
8%
780
29%
780
12%
2024
December1st to 15thNight
18%
780
7%
2730
4%
780
22%
780
8%
2193
December16th to endNight
13%
832
6%
2902
3%
832
18%
832
6%
2429

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
16%9%47%6%35%45%7%29%
49429
Night
16%9%46%5%3445%6%32%
49363
Cloud CoverDay
16%9%47%6%3445%7%29%
49439
Night
16%9%46%5%34446%32%
49367
TransparencyDay
53%6%11%18%9%1
49140
Night
51%5%11%18%11%1
49171
SeeingDay
21%10%25%21%14%6%
5920
Night
22%10%25%27%12%1
15843

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
20%15%6%10%6%34435%18%
1746
16th to endDay
17%17%8%11%8%34445%14%
1872
February1st to 15thDay
18%17%7%10%7%44325%16%
1710
16th to endDay
19%13%48%7%34445%22%
1646
March1st to 15thDay
21%13%5%7%5%24446%25%
2079
16th to endDay
18%9%5%6%6%34447%28%
2112
April1st to 15thDay
20%11%35%5%33447%29%
2080
16th to endDay
19%9%35%6%24435%36%
2337
May1st to 15thDay
20%7%36%5%35%6%6%7%27%
2331
16th to endDay
12%6%25%6%45%5%6%8%36%
2512
June1st to 15thDay
14%5%26%6%35%5%6%8%35%
2520
16th to endDay
14%5%35%5%35%6%7%9%33%
2520
July1st to 15thDay
11%6%36%6%36%5%5%8%36%
2399
16th to endDay
12%425%6%36%6%7%10%34%
2465
August1st to 15thDay
9%6%26%6%46%6%7%10%31%
2340
16th to endDay
10%5%37%5%35%5%6%9%36%
2428
September1st to 15thDay
15%6%25%425%45%6%39%
2079
16th to endDay
16%6%35%5%2445%5%39%
1980
October1st to 15thDay
19%6%26%6%3335%7%33%
1815
16th to endDay
24%8%26%5%24336%31%
1920
November1st to 15thDay
13%9%36%5%345%37%36%
1747
16th to endDay
19%15%47%5%3435%6%23%
1560
December1st to 15thDay
20%17%7%10%6%3445%415%
1560
16th to endDay
22%18%8%12%7%2422412%
1671
January1st to 15thNight
21%15%6%9%6%3433420%
2522
16th to endNight
17%15%7%9%7%35%44420%
2704
February1st to 15thNight
19%14%6%9%7%35%34420%
2480
16th to endNight
19%13%5%9%6%35%44423%
2110
March1st to 15thNight
21%10%5%7%434345%28%
2093
16th to endNight
17%10%35%5%33345%36%
2112
April1st to 15thNight
18%10%46%5%2445%6%31%
1866
16th to endNight
14%7%345%35%348%39%
1632
May1st to 15thNight
17%7%26%5%35%5%5%8%31%
1620
16th to endNight
12%4235%35%45%11%41%
1598
June1st to 15thNight
8%435%5%25%5%5%7%45%
1440
16th to endNight
10%426%5%35%5%6%9%41%
1440
July1st to 15thNight
7%426%5%35%5%6%8%44%
1557
16th to endNight
8%4145%25%5%6%9%44%
1703
August1st to 15thNight
8%4134245%6%9%48%
1620
16th to endNight
10%31442445%8%48%
1761
September1st to 15thNight
14%5%1332345%7%47%
1879
16th to endNight
14%424334448%45%
1980
October1st to 15thNight
15%5%16%43435%7%41%
2145
16th to endNight
23%6%35%5%2445%7%32%
2304
November1st to 15thNight
16%8%34324447%38%
2435
16th to endNight
20%14%46%5%34445%26%
2730
December1st to 15thNight
20%16%6%9%6%24345%20%
2730
16th to endNight
22%17%7%8%6%3445%415%
2902

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
20%15%6%11%6%44335%18%
1746
16th to endDay
17%18%7%11%8%34445%13%
1872
February1st to 15thDay
19%16%8%9%9%44325%16%
1710
16th to endDay
19%14%49%8%3434422%
1646
March1st to 15thDay
21%13%6%8%5%24446%24%
2090
16th to endDay
18%9%5%7%6%34446%29%
2111
April1st to 15thDay
20%11%45%5%24347%29%
2080
16th to endDay
19%9%35%5%24435%36%
2337
May1st to 15thDay
19%7%36%5%25%6%6%6%28%
2331
16th to endDay
12%6%35%6%45%5%6%8%36%
2512
June1st to 15thDay
14%5%25%7%35%5%6%8%35%
2520
16th to endDay
14%5%25%5%35%6%6%10%33%
2520
July1st to 15thDay
11%6%37%6%35%5%5%8%36%
2399
16th to endDay
12%5%25%6%36%5%7%9%34%
2465
August1st to 15thDay
10%5%26%7%46%7%7%10%31%
2340
16th to endDay
10%5%37%5%46%5%6%8%36%
2428
September1st to 15thDay
15%7%25%43445%7%39%
2079
16th to endDay
17%6%35%42445%6%39%
1980
October1st to 15thDay
20%6%37%5%2445%7%32%
1815
16th to endDay
24%8%35%5%24336%30%
1920
November1st to 15thDay
14%9%37%5%345%46%36%
1747
16th to endDay
19%15%47%5%2445%6%24%
1560
December1st to 15thDay
20%17%8%10%6%2444415%
1560
16th to endDay
22%18%8%12%7%3423412%
1671
January1st to 15thNight
22%15%6%10%6%2433419%
2522
16th to endNight
17%15%7%9%7%345%3419%
2704
February1st to 15thNight
18%14%6%10%7%36%34420%
2473
16th to endNight
19%13%5%9%6%3444423%
2110
March1st to 15thNight
20%11%47%5%34445%28%
2105
16th to endNight
16%10%35%5%33445%36%
2112
April1st to 15thNight
18%10%36%5%2445%7%30%
1866
16th to endNight
13%7%345%34348%39%
1632
May1st to 15thNight
17%7%27%5%35%5%5%8%32%
1619
16th to endNight
12%4236%345%5%10%41%
1598
June1st to 15thNight
8%5%35%435%45%8%45%
1440
16th to endNight
9%426%5%35%46%9%41%
1440
July1st to 15thNight
7%425%6%35%5%5%8%44%
1557
16th to endNight
7%4245%25%5%6%9%44%
1703
August1st to 15thNight
8%4243245%6%9%47%
1620
16th to endNight
10%3144245%5%8%48%
1761
September1st to 15thNight
13%5%1342345%7%46%
1879
16th to endNight
14%5%233245%47%45%
1980
October1st to 15thNight
15%5%26%5%24447%41%
2145
16th to endNight
22%7%25%42445%7%32%
2304
November1st to 15thNight
17%8%24424447%38%
2435
16th to endNight
19%14%36%6%34445%26%
2730
December1st to 15thNight
20%16%7%9%6%24335%19%
2730
16th to endNight
22%17%6%9%7%34445%14%
2902

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
69%311%10%5%
1747
16th to endDay
72%411%9%1
1872
February1st to 15thDay
72%37%11%4
1712
16th to endDay
63%410%12%7%
1646
March1st to 15thDay
60%5%11%16%5%
2090
16th to endDay
55%410%19%9%
2112
April1st to 15thDay
54%411%17%11%
2080
16th to endDay
49%5%9%18%12%4
2337
May1st to 15thDay
52%7%10%18%9%1
2331
16th to endDay
43%8%13%20%12%1
2516
June1st to 15thDay
44%7%12%24%9%
2520
16th to endDay
43%7%13%21%11%1
2520
July1st to 15thDay
45%5%12%20%12%3
2260
16th to endDay
41%8%13%22%13%
2310
August1st to 15thDay
43%8%13%23%10%
2327
16th to endDay
41%8%12%21%12%3
2428
September1st to 15thDay
43%6%11%22%13%1
2079
16th to endDay
45%5%10%22%15%1
1980
October1st to 15thDay
50%5%11%18%14%
1815
16th to endDay
55%413%17%8%
1920
November1st to 15thDay
48%5%10%18%12%3
1747
16th to endDay
59%5%11%16%7%
1560
December1st to 15thDay
71%5%8%10%3
1560
16th to endDay
76%5%7%8%2
1671
January1st to 15thNight
67%48%13%5%
2522
16th to endNight
66%5%10%13%3
2704
February1st to 15thNight
66%5%9%13%4
2482
16th to endNight
62%49%16%6%
2110
March1st to 15thNight
58%48%18%8%
2105
16th to endNight
50%411%20%11%1
2112
April1st to 15thNight
52%411%15%14%
1866
16th to endNight
43%5%12%19%15%4
1632
May1st to 15thNight
49%6%10%20%11%1
1620
16th to endNight
37%7%14%22%14%2
1600
June1st to 15thNight
36%6%13%26%15%
1440
16th to endNight
38%7%14%20%16%2
1440
July1st to 15thNight
37%7%11%22%19%2
1468
16th to endNight
32%7%15%25%15%3
1595
August1st to 15thNight
31%6%13%28%19%1
1609
16th to endNight
32%6%12%27%17%4
1761
September1st to 15thNight
34%6%12%22%20%3
1879
16th to endNight
37%5%10%25%19%1
1980
October1st to 15thNight
42%5%13%21%15%1
2145
16th to endNight
50%5%12%21%9%
2304
November1st to 15thNight
44%5%12%19%12%4
2435
16th to endNight
58%5%10%17%7%
2730
December1st to 15thNight
66%5%11%11%4
2730
16th to endNight
70%6%10%10%1
2902

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
25%22%34%8%7%
135
16th to endDay
31%23%31%11%2
144
February1st to 15thDay
32%22%40%3
135
16th to endDay
27%23%38%10%
120
March1st to 15thDay
30%14%32%16%5%
306
16th to endDay
25%15%30%19%6%2
288
April1st to 15thDay
27%14%26%19%10%2
270
16th to endDay
22%10%29%19%11%7%
270
May1st to 15thDay
29%13%24%17%11%3
288
16th to endDay
16%9%27%25%12%8%
331
June1st to 15thDay
16%7%26%28%15%4
315
16th to endDay
22%6%24%26%15%4
315
July1st to 15thDay
15%420%27%20%10%
305
16th to endDay
12%316%28%25%13%
326
August1st to 15thDay
15%118%27%21%15%
313
16th to endDay
14%314%25%24%18%
332
September1st to 15thDay
13%320%21%24%16%
315
16th to endDay
18%7%15%16%26%15%
314
October1st to 15thDay
20%6%20%26%21%4
315
16th to endDay
26%10%31%21%9%1
336
November1st to 15thDay
23%12%26%21%15%1
169
16th to endDay
24%21%36%14%3
90
December1st to 15thDay
27%24%28%12%42
90
16th to endDay
37%21%30%9%1
98
January1st to 15thNight
30%16%31%17%3
780
16th to endNight
26%17%33%19%2
832
February1st to 15thNight
28%17%30%21%2
764
16th to endNight
27%12%34%21%3
683
March1st to 15thNight
27%13%28%26%3
764
16th to endNight
20%11%35%25%6%1
768
April1st to 15thNight
26%13%29%23%6%
718
16th to endNight
18%6%32%31%9%
552
May1st to 15thNight
19%7%23%36%10%1
540
16th to endNight
14%322%35%20%2
479
June1st to 15thNight
10%227%42%15%
360
16th to endNight
10%323%44%17%
360
July1st to 15thNight
8%218%43%25%1
448
16th to endNight
9%212%40%31%3
564
August1st to 15thNight
12%111%43%27%4
539
16th to endNight
12%114%32%33%4
615
September1st to 15thNight
17%314%30%29%4
720
16th to endNight
16%5%17%23%28%8%
717
October1st to 15thNight
18%6%25%28%18%2
720
16th to endNight
26%11%28%24%8%
768
November1st to 15thNight
21%8%26%29%12%1
760
16th to endNight
28%16%27%19%7%
780
December1st to 15thNight
31%17%27%18%5%
780
16th to endNight
31%15%32%18%2
832
Page generated at 2018-03-12 13:28:11. Version ac04

Copyright 2018 A. Danko


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