Kentucky Cutoff Overlook
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Kentucky Cutoff Overlook clear sky chart from 2005-11-05 to 2017-12-20.

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
43%
15772
21%
48093
15%
15728
50%
15728
25%
31118

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
21%
720
16%
2327
9%
716
30%
716
15%
1639
January16th to endNight
19%
768
18%
2481
8%
768
31%
768
15%
1746
February1st to 15thNight
19%
704
16%
2112
6%
701
29%
701
17%
1495
February16th to endNight
16%
631
19%
1893
7%
631
26%
631
16%
1362
March1st to 15thNight
24%
720
18%
2094
10%
720
32%
720
19%
1477
March16th to endNight
29%
768
14%
2112
8%
768
34%
768
21%
1498
April1st to 15thNight
34%
575
23%
1833
13%
575
48%
575
27%
1101
April16th to endNight
36%
540
22%
1690
13%
540
46%
540
25%
1071
May1st to 15thNight
43%
539
18%
1620
11%
539
50%
539
24%
1083
May16th to endNight
54%
562
18%
1684
13%
561
58%
561
30%
1050
June1st to 15thNight
66%
540
17%
1620
14%
540
68%
540
33%
993
June16th to endNight
72%
540
18%
1620
16%
540
73%
540
33%
978
July1st to 15thNight
67%
510
12%
1530
11%
510
68%
510
29%
975
July16th to endNight
71%
564
18%
1595
16%
531
74%
531
33%
958
August1st to 15thNight
72%
539
21%
1612
20%
536
72%
536
35%
959
August16th to endNight
75%
573
21%
1910
23%
573
75%
573
31%
1112
September1st to 15thNight
60%
666
20%
1926
19%
666
61%
666
28%
1245
September16th to endNight
62%
717
29%
1980
24%
717
64%
717
35%
1208
October1st to 15thNight
57%
720
33%
1987
27%
720
62%
720
39%
1151
October16th to endNight
45%
768
30%
2367
23%
768
55%
768
30%
1414
November1st to 15thNight
43%
760
27%
2471
23%
760
53%
760
29%
1462
November16th to endNight
35%
780
25%
2535
18%
780
46%
780
25%
1554
December1st to 15thNight
30%
780
17%
2535
12%
780
37%
780
16%
1771
December16th to endNight
24%
788
18%
2559
11%
788
34%
788
14%
1816

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%7%36%5%35%45%7%36%
48742
Night
12%7%35%5%3445%7%41%
48290
TransparencyDay
45%6%11%19%14%2
48443
Night
42%5%11%21%16%3
48093
SeeingDay
17%9%21%22%19%9%
5592
Night
16%9%23%27%18%3
15774

By Month

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%10%5%10%6%24445%28%
1611
16th to endDay
17%10%46%5%2334437%
1742
February1st to 15thDay
14%12%5%8%6%34345%30%
1750
16th to endDay
16%11%37%5%2435%6%32%
1580
March1st to 15thDay
19%10%35%5%2434435%
1865
16th to endDay
16%10%5%6%5%34445%31%
2111
April1st to 15thDay
12%7%26%5%2446%7%41%
2124
16th to endDay
14%6%35%5%35%447%37%
2268
May1st to 15thDay
17%5%45%6%345%5%7%33%
2331
16th to endDay
12%7%16%5%36%5%6%8%35%
2431
June1st to 15thDay
9%5%25%7%46%5%7%9%37%
2340
16th to endDay
7%425%6%46%6%8%11%37%
2340
July1st to 15thDay
12%5%27%7%47%6%7%9%28%
2340
16th to endDay
10%5%26%6%47%7%8%10%29%
2465
August1st to 15thDay
8%5%26%6%46%6%7%10%32%
2334
16th to endDay
10%425%6%47%6%8%10%33%
2292
September1st to 15thDay
17%6%35%7%35%45%7%33%
2022
16th to endDay
13%3345%3445%7%43%
1980
October1st to 15thDay
11%414423446%51%
1971
16th to endDay
16%5%24323345%48%
1854
November1st to 15thDay
14%6%1433335%5%46%
1717
16th to endDay
15%8%34323336%46%
1755
December1st to 15thDay
19%9%46%5%23436%33%
1755
16th to endDay
17%11%47%424346%32%
1764
January1st to 15thNight
17%8%49%6%33335%34%
2327
16th to endNight
16%11%5%7%5%3334433%
2481
February1st to 15thNight
15%10%47%5%34446%32%
2103
16th to endNight
17%11%48%423345%32%
1893
March1st to 15thNight
17%8%46%5%335%46%35%
2094
16th to endNight
15%8%36%425%45%5%35%
2112
April1st to 15thNight
13%6%24323447%46%
1833
16th to endNight
12%5%35%5%3445%6%42%
1690
May1st to 15thNight
13%6%36%435%5%5%8%38%
1619
16th to endNight
7%425%6%35%5%6%10%43%
1682
June1st to 15thNight
6%4245%35%6%7%9%44%
1620
16th to endNight
4325%446%6%7%11%44%
1620
July1st to 15thNight
9%3245%35%6%7%9%41%
1620
16th to endNight
7%3246%46%5%6%11%42%
1703
August1st to 15thNight
6%4244245%8%10%45%
1623
16th to endNight
7%314435%5%6%10%46%
1910
September1st to 15thNight
11%5%25%5%35%45%6%43%
1926
16th to endNight
10%5%2442345%6%51%
1980
October1st to 15thNight
12%323322336%55%
1987
16th to endNight
14%5%24423345%49%
2367
November1st to 15thNight
12%6%25%423446%48%
2471
16th to endNight
14%7%3442323446%
2535
December1st to 15thNight
17%12%46%5%24345%33%
2535
16th to endNight
19%11%37%5%34335%32%
2559

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
58%46%15%13%2
1612
16th to endDay
50%210%22%12%1
1742
February1st to 15thDay
56%46%18%12%1
1752
16th to endDay
51%411%18%11%1
1580
March1st to 15thDay
51%47%18%13%3
1865
16th to endDay
53%410%19%10%
2112
April1st to 15thDay
41%5%10%21%17%3
2124
16th to endDay
45%5%9%21%15%2
2268
May1st to 15thDay
48%7%11%20%11%1
2331
16th to endDay
44%8%14%20%9%2
2435
June1st to 15thDay
41%8%14%21%12%1
2340
16th to endDay
37%9%14%19%15%3
2340
July1st to 15thDay
47%9%14%15%9%3
2201
16th to endDay
42%10%14%19%11%2
2310
August1st to 15thDay
42%9%16%17%12%1
2321
16th to endDay
42%8%14%18%14%1
2292
September1st to 15thDay
49%6%10%16%13%3
2022
16th to endDay
39%6%9%20%21%2
1980
October1st to 15thDay
33%48%23%24%5%
1971
16th to endDay
37%38%22%24%3
1854
November1st to 15thDay
38%38%21%22%5%
1717
16th to endDay
40%36%24%22%3
1755
December1st to 15thDay
52%48%21%11%2
1755
16th to endDay
53%411%17%10%1
1764
January1st to 15thNight
53%39%16%14%2
2327
16th to endNight
53%38%18%13%2
2481
February1st to 15thNight
52%49%20%11%1
2112
16th to endNight
54%37%19%12%1
1893
March1st to 15thNight
50%5%8%19%13%3
2094
16th to endNight
48%5%11%22%10%
2112
April1st to 15thNight
37%49%24%19%4
1833
16th to endNight
40%5%9%24%16%3
1690
May1st to 15thNight
42%7%12%23%12%1
1620
16th to endNight
34%8%17%23%13%2
1684
June1st to 15thNight
31%8%17%24%15%1
1620
16th to endNight
31%8%15%25%14%4
1620
July1st to 15thNight
34%10%18%18%15%2
1530
16th to endNight
32%7%19%22%14%3
1595
August1st to 15thNight
30%7%17%24%17%1
1612
16th to endNight
31%8%16%25%15%2
1910
September1st to 15thNight
39%7%12%20%15%4
1926
16th to endNight
32%6%8%21%27%3
1980
October1st to 15thNight
31%210%23%26%6%
1987
16th to endNight
37%35%21%25%6%
2367
November1st to 15thNight
36%35%21%24%7%
2471
16th to endNight
41%37%22%22%3
2535
December1st to 15thNight
53%38%19%12%3
2535
16th to endNight
54%39%16%14%1
2559

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
28%32%24%7%33
90
16th to endDay
25%29%39%411
96
February1st to 15thDay
28%25%36%7%1
90
16th to endDay
33%18%40%6%1
81
March1st to 15thDay
32%22%30%10%2
155
16th to endDay
20%14%32%20%11%1
288
April1st to 15thDay
21%15%23%24%13%1
270
16th to endDay
19%11%27%20%17%2
270
May1st to 15thDay
19%12%32%16%13%5%
288
16th to endDay
18%5%22%27%12%13%
331
June1st to 15thDay
8%5%12%29%28%14%
315
16th to endDay
9%420%26%26%12%
315
July1st to 15thDay
13%315%27%24%14%
305
16th to endDay
10%110%23%31%22%
326
August1st to 15thDay
14%18%23%32%18%
313
16th to endDay
13%29%29%25%20%
332
September1st to 15thDay
18%311%20%31%14%
315
16th to endDay
12%413%30%25%14%
314
October1st to 15thDay
12%5%20%27%27%6%
315
16th to endDay
18%10%23%25%16%5%
270
November1st to 15thDay
18%11%38%21%7%2
135
16th to endDay
19%13%35%19%12%
135
December1st to 15thDay
23%18%37%14%5%
135
16th to endDay
29%25%39%4
108
January1st to 15thNight
24%22%28%19%6%
720
16th to endNight
24%19%32%21%2
768
February1st to 15thNight
24%16%34%21%2
704
16th to endNight
25%17%38%16%1
631
March1st to 15thNight
24%13%32%24%4
720
16th to endNight
21%12%30%24%10%1
768
April1st to 15thNight
17%13%30%24%12%
575
16th to endNight
14%9%34%27%12%1
540
May1st to 15thNight
15%7%25%30%16%3
540
16th to endNight
8%323%33%24%7%
563
June1st to 15thNight
6%114%37%30%7%
540
16th to endNight
4112%41%34%6%
540
July1st to 15thNight
10%10%34%37%5%
510
16th to endNight
6%17%31%42%10%
564
August1st to 15thNight
7%17%31%43%7%
539
16th to endNight
9%1437%38%9%
573
September1st to 15thNight
13%211%25%40%7%
666
16th to endNight
12%213%30%34%6%
717
October1st to 15thNight
14%6%17%29%25%6%
720
16th to endNight
17%8%25%27%18%2
768
November1st to 15thNight
15%10%25%26%18%3
760
16th to endNight
20%13%26%27%11%
780
December1st to 15thNight
23%17%24%24%8%
780
16th to endNight
26%17%26%24%4
788
Page generated at 2017-12-21 06:04:51. Version ac04

Copyright 2017 A. Danko


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