Devil`s Sinkhole State Natural Area
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Devil`s Sinkhole State Natural Area clear sky chart from 2005-11-05 to 2017-08-12.

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
50%
15306
28%
46594
19%
15263
60%
15263
39%
25412

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
38%
895
28%
2327
12%
895
48%
895
38%
1406
January16th to endNight
39%
775
34%
2311
16%
775
54%
775
37%
1278
February1st to 15thNight
38%
704
30%
2107
14%
698
52%
698
37%
1119
February16th to endNight
26%
632
31%
1894
9%
632
45%
632
38%
999
March1st to 15thNight
33%
640
29%
2080
12%
640
49%
640
33%
1139
March16th to endNight
30%
576
27%
2112
16%
576
46%
576
32%
1112
April1st to 15thNight
27%
539
27%
1883
13%
539
47%
539
33%
997
April16th to endNight
30%
540
30%
1800
15%
540
52%
540
35%
968
May1st to 15thNight
31%
540
23%
1629
13%
540
45%
540
33%
955
May16th to endNight
43%
562
25%
1684
17%
561
57%
561
35%
989
June1st to 15thNight
67%
540
23%
1620
22%
540
74%
540
55%
764
June16th to endNight
65%
540
22%
1620
23%
540
69%
540
43%
879
July1st to 15thNight
77%
510
21%
1530
23%
510
79%
510
42%
845
July16th to endNight
85%
564
28%
1630
32%
531
89%
531
50%
807
August1st to 15thNight
89%
527
28%
1750
35%
524
90%
524
51%
794
August16th to endNight
78%
525
22%
1750
25%
525
79%
525
34%
993
September1st to 15thNight
78%
495
22%
1798
28%
495
78%
495
30%
1041
September16th to endNight
68%
492
25%
1815
28%
492
70%
492
31%
1023
October1st to 15thNight
63%
495
34%
1815
31%
495
71%
495
41%
859
October16th to endNight
58%
627
36%
2035
24%
627
67%
627
48%
961
November1st to 15thNight
53%
828
31%
2228
15%
828
60%
828
47%
1210
November16th to endNight
49%
900
32%
2340
15%
900
57%
900
44%
1325
December1st to 15thNight
44%
900
30%
2340
16%
900
51%
900
38%
1427
December16th to endNight
37%
960
29%
2496
13%
960
46%
960
37%
1522

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
9%5%24424447%50%
47363
Night
7%423323347%56%
46799
Cloud CoverDay
9%5%24424447%50%
47361
Night
7%413323347%56%
46799
TransparencyDay
33%410%20%20%10%
47065
Night
27%411%21%21%13%
46600
SeeingDay
10%423%34%22%4
5223
Night
9%5%30%38%15%1
15312

By Month

Percentage Cloud Cover SW (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
11%6%14322336%52%
1614
16th to endDay
10%312323345%57%
1920
February1st to 15thDay
8%5%2432234458%
1750
16th to endDay
8%324323345%58%
1580
March1st to 15thDay
13%6%23313345%51%
1878
16th to endDay
11%5%24322346%53%
2112
April1st to 15thDay
9%6%24423346%52%
2060
16th to endDay
9%5%34324347%51%
2160
May1st to 15thDay
11%6%2442445%7%45%
2322
16th to endDay
13%6%35%43435%6%44%
2430
June1st to 15thDay
442442435%8%55%
2340
16th to endDay
9%5%35%5%35%46%8%42%
2340
July1st to 15thDay
10%5%245%35%5%5%8%43%
2340
16th to endDay
6%3245%35%46%9%47%
2424
August1st to 15thDay
321343445%9%56%
2113
16th to endDay
9%5%246%36%5%5%9%41%
2100
September1st to 15thDay
11%7%35%7%45%6%6%7%35%
1832
16th to endDay
10%6%26%5%33447%45%
1815
October1st to 15thDay
9%5%24313446%53%
1815
16th to endDay
6%413222325%64%
1823
November1st to 15thDay
9%6%24324336%52%
1627
16th to endDay
8%5%2431323460%
1620
December1st to 15thDay
13%6%24322346%49%
1620
16th to endDay
11%7%24312336%52%
1728
January1st to 15thNight
11%5%24323245%54%
2327
16th to endNight
10%413423246%55%
2311
February1st to 15thNight
7%5%24213346%58%
2102
16th to endNight
7%424313346%58%
1894
March1st to 15thNight
10%5%1431335%6%54%
2080
16th to endNight
8%423323346%55%
2112
April1st to 15thNight
8%413413448%55%
1883
16th to endNight
5%5%24324447%56%
1800
May1st to 15thNight
9%43442435%6%52%
1628
16th to endNight
7%5%24324338%52%
1683
June1st to 15thNight
121121336%10%65%
1620
16th to endNight
42133245%6%9%55%
1620
July1st to 15thNight
6%112325%5%5%10%55%
1620
16th to endNight
41221446%10%60%
1741
August1st to 15thNight
21122435%10%64%
1761
16th to endNight
5%3144345%7%10%49%
1750
September1st to 15thNight
8%325%3245%6%9%48%
1798
16th to endNight
8%4245%3445%7%49%
1815
October1st to 15thNight
8%312212238%61%
1815
16th to endNight
5%32212236%67%
2035
November1st to 15thNight
6%423213245%62%
2228
16th to endNight
9%313212245%61%
2340
December1st to 15thNight
11%7%24223246%52%
2340
16th to endNight
9%7%24323335%53%
2496

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
11%5%24323336%52%
1614
16th to endDay
10%412313445%57%
1920
February1st to 15thDay
8%5%2432334458%
1750
16th to endDay
8%314313346%58%
1580
March1st to 15thDay
13%6%24313346%51%
1878
16th to endDay
10%5%24322347%53%
2110
April1st to 15thDay
8%6%24424346%52%
2060
16th to endDay
8%5%34324446%51%
2160
May1st to 15thDay
10%6%3442445%7%45%
2322
16th to endDay
11%6%35%434447%44%
2430
June1st to 15thDay
432443445%8%54%
2340
16th to endDay
8%5%25%5%35%5%6%7%43%
2340
July1st to 15thDay
9%5%25%5%345%5%8%43%
2340
16th to endDay
6%3245%35%5%6%10%47%
2424
August1st to 15thDay
331343445%9%56%
2113
16th to endDay
9%6%146%46%46%9%41%
2100
September1st to 15thDay
11%6%26%7%46%5%6%7%35%
1832
16th to endDay
10%5%36%5%24447%45%
1815
October1st to 15thDay
9%5%2432335%6%53%
1815
16th to endDay
6%323312335%64%
1823
November1st to 15thDay
9%5%23424345%52%
1627
16th to endDay
8%42431323460%
1620
December1st to 15thDay
12%6%25%323346%49%
1620
16th to endDay
10%7%24422346%51%
1728
January1st to 15thNight
11%5%23313345%54%
2327
16th to endNight
10%423323246%55%
2311
February1st to 15thNight
7%424313345%58%
2102
16th to endNight
7%42432335%6%58%
1894
March1st to 15thNight
10%5%1432235%6%54%
2080
16th to endNight
8%32432335%6%56%
2112
April1st to 15thNight
6%413424448%55%
1883
16th to endNight
442442445%6%56%
1800
May1st to 15thNight
8%4245%2335%6%52%
1628
16th to endNight
7%5%24324448%52%
1683
June1st to 15thNight
111121345%11%65%
1620
16th to endNight
32134235%6%9%55%
1620
July1st to 15thNight
5%2123245%5%10%55%
1620
16th to endNight
31222445%11%60%
1741
August1st to 15thNight
21222345%10%65%
1761
16th to endNight
5%3144345%6%10%49%
1750
September1st to 15thNight
7%4244335%6%9%48%
1798
16th to endNight
8%4245%24448%49%
1815
October1st to 15thNight
7%322212238%62%
1815
16th to endNight
5%32213235%67%
2035
November1st to 15thNight
6%413213246%62%
2228
16th to endNight
9%314313245%61%
2340
December1st to 15thNight
11%6%24313247%53%
2340
16th to endNight
9%7%24323345%53%
2496

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
33%35%19%23%14%
1615
16th to endDay
29%37%13%28%17%
1920
February1st to 15thDay
28%38%14%23%21%
1751
16th to endDay
27%36%17%27%17%
1580
March1st to 15thDay
34%28%16%19%17%
1878
16th to endDay
33%37%19%20%15%
2112
April1st to 15thDay
33%37%16%20%18%
2060
16th to endDay
32%48%19%20%15%
2160
May1st to 15thDay
38%5%10%16%20%8%
2322
16th to endDay
40%5%10%19%19%5%
2434
June1st to 15thDay
27%412%27%22%6%
2340
16th to endDay
38%5%13%21%17%3
2340
July1st to 15thDay
36%7%14%26%13%2
2201
16th to endDay
28%7%20%30%11%
2272
August1st to 15thDay
24%5%15%34%17%1
2100
16th to endDay
39%6%15%25%12%
2100
September1st to 15thDay
46%6%12%18%13%3
1832
16th to endDay
37%5%12%18%16%9%
1815
October1st to 15thDay
31%5%9%22%21%9%
1815
16th to endDay
24%3417%30%20%
1823
November1st to 15thDay
33%47%21%19%12%
1627
16th to endDay
29%35%14%22%25%
1620
December1st to 15thDay
36%38%14%25%11%
1620
16th to endDay
34%26%19%25%11%
1728
January1st to 15thNight
33%26%16%22%19%
2327
16th to endNight
30%25%16%24%20%
2311
February1st to 15thNight
27%38%13%22%24%
2112
16th to endNight
26%36%17%26%19%
1894
March1st to 15thNight
31%310%14%21%19%
2080
16th to endNight
29%410%18%20%15%
2112
April1st to 15thNight
29%410%17%17%20%
1883
16th to endNight
28%410%22%18%15%
1800
May1st to 15thNight
33%411%22%17%10%
1629
16th to endNight
31%6%13%24%18%5%
1685
June1st to 15thNight
13%6%15%31%26%5%
1620
16th to endNight
24%6%18%25%19%5%
1620
July1st to 15thNight
23%8%20%27%17%2
1530
16th to endNight
15%8%22%36%15%1
1630
August1st to 15thNight
15%6%18%37%20%
1750
16th to endNight
29%7%21%27%12%1
1750
September1st to 15thNight
30%9%15%24%16%3
1798
16th to endNight
32%6%13%21%16%9%
1815
October1st to 15thNight
23%313%26%22%10%
1815
16th to endNight
20%26%16%29%23%
2035
November1st to 15thNight
23%37%24%25%14%
2228
16th to endNight
25%38%13%21%26%
2340
December1st to 15thNight
33%38%17%22%15%
2340
16th to endNight
32%35%16%24%16%
2496

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
16%6%36%30%8%1
90
16th to endDay
11%9%39%31%8%
96
February1st to 15thDay
8%11%40%23%14%2
90
16th to endDay
11%8%46%27%41
81
March1st to 15thDay
22%7%38%18%12%
90
16th to endDay
3441%38%11%1
96
April1st to 15thDay
6%15%50%25%2
179
16th to endDay
10%13%44%22%9%
270
May1st to 15thDay
14%7%45%26%41
459
16th to endDay
17%6%32%32%9%
517
June1st to 15thDay
5%216%50%22%1
495
16th to endDay
7%115%42%29%4
495
July1st to 15thDay
8%10%43%31%5%
475
16th to endDay
41439%40%9%
473
August1st to 15thDay
5%334%41%14%
300
16th to endDay
14%1438%32%8%
268
September1st to 15thDay
8%28%47%14%
107
16th to endDay
10%215%55%16%
90
October1st to 15thDay
45%50%32%7%
90
16th to endDay
10%6%19%34%28%1
96
November1st to 15thDay
23%8%31%21%13%2
90
16th to endDay
20%13%36%12%16%1
90
December1st to 15thDay
18%427%26%17%4
90
16th to endDay
17%11%38%26%6%
96
January1st to 15thNight
14%8%35%33%8%
900
16th to endNight
11%6%38%33%9%
775
February1st to 15thNight
10%11%37%33%7%
704
16th to endNight
10%9%51%26%2
632
March1st to 15thNight
13%7%42%30%5%
640
16th to endNight
9%11%46%28%4
576
April1st to 15thNight
8%8%53%26%2
539
16th to endNight
6%9%52%28%3
540
May1st to 15thNight
10%7%48%29%3
540
16th to endNight
8%439%36%9%
563
June1st to 15thNight
2126%59%10%
540
16th to endNight
424%50%19%1
540
July1st to 15thNight
6%9%55%27%
510
16th to endNight
3458%30%1
564
August1st to 15thNight
2243%48%2
527
16th to endNight
6%1444%39%3
525
September1st to 15thNight
6%5%42%40%4
495
16th to endNight
8%110%46%29%3
492
October1st to 15thNight
8%220%44%22%1
495
16th to endNight
6%426%37%21%2
627
November1st to 15thNight
8%5%29%35%18%1
828
16th to endNight
10%6%29%37%13%2
900
December1st to 15thNight
14%6%31%37%9%1
900
16th to endNight
12%8%38%31%7%
960
Page generated at 2017-08-13 13:16:23. Version ac04

Copyright 2017 A. Danko


Devil`s Sinkhole State Natural Area Clear Sky Chart | Charts Home