Hickory Knob State Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Hickory Knob State Park clear sky chart from 2005-11-05 to 2019-06-02.

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
48%
17976
23%
53823
15%
17932
57%
17932
28%
33144

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
31%
840
24%
2717
11%
836
47%
836
21%
1673
January16th to endNight
28%
896
26%
2912
14%
896
44%
896
22%
1776
February1st to 15thNight
32%
824
25%
2515
12%
820
46%
820
25%
1546
February16th to endNight
27%
735
25%
2205
9%
735
43%
735
25%
1371
March1st to 15thNight
31%
840
26%
2328
10%
840
45%
840
28%
1456
March16th to endNight
39%
896
22%
2464
11%
896
47%
896
28%
1551
April1st to 15thNight
41%
838
25%
2306
13%
838
50%
838
34%
1362
April16th to endNight
49%
663
27%
1920
16%
663
59%
663
35%
1119
May1st to 15thNight
53%
629
21%
1890
12%
629
59%
629
33%
1121
May16th to endNight
61%
657
20%
1971
14%
657
64%
657
29%
1233
June1st to 15thNight
67%
588
16%
1765
15%
588
68%
588
29%
1134
June16th to endNight
73%
585
15%
1755
13%
585
74%
585
31%
1088
July1st to 15thNight
68%
555
12%
1665
10%
555
69%
555
24%
1108
July16th to endNight
73%
612
13%
1739
12%
579
74%
579
27%
1133
August1st to 15thNight
72%
575
16%
1715
14%
572
73%
572
25%
1154
August16th to endNight
64%
678
15%
2030
13%
678
65%
678
25%
1346
September1st to 15thNight
65%
780
18%
2145
14%
780
66%
780
28%
1422
September16th to endNight
55%
777
22%
2145
18%
777
60%
777
29%
1394
October1st to 15thNight
55%
780
30%
2226
26%
780
61%
780
37%
1303
October16th to endNight
53%
832
35%
2496
25%
832
67%
832
38%
1367
November1st to 15thNight
50%
820
30%
2542
23%
820
60%
820
34%
1434
November16th to endNight
42%
840
28%
2730
18%
840
55%
840
30%
1532
December1st to 15thNight
39%
840
26%
2730
16%
840
51%
840
24%
1657
December16th to endNight
31%
896
22%
2912
13%
896
43%
896
21%
1864

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
12%5%245%35%45%7%43%
54508
Night
12%5%2442445%7%45%
54023
TransparencyDay
39%411%21%18%5%
54209
Night
37%410%19%19%6%
53826
SeeingDay
17%6%20%23%21%10%
7775
Night
15%7%21%30%21%3
17979

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%6%245%14345%44%
1881
16th to endDay
16%6%13314336%48%
2016
February1st to 15thDay
17%42442445%6%43%
2004
16th to endDay
19%5%14324346%43%
1840
March1st to 15thDay
16%323424445%48%
2292
16th to endDay
14%4245%24347%45%
2463
April1st to 15thDay
11%4244245%5%7%47%
2302
16th to endDay
10%5%235%24447%49%
2654
May1st to 15thDay
9%424435%46%9%45%
2721
16th to endDay
11%5%245%46%46%8%41%
2847
June1st to 15thDay
8%425%6%35%6%6%10%38%
2548
16th to endDay
43145%46%5%7%12%44%
2535
July1st to 15thDay
8%5%25%7%46%6%9%9%32%
2535
16th to endDay
6%426%7%48%8%8%11%31%
2673
August1st to 15thDay
11%6%26%5%5%6%6%7%10%31%
2487
16th to endDay
11%6%26%7%47%6%6%8%31%
2507
September1st to 15thDay
10%425%6%45%6%5%7%39%
2145
16th to endDay
14%7%245%24447%43%
2145
October1st to 15thDay
14%413313345%53%
2064
16th to endDay
10%31342233459%
2080
November1st to 15thDay
14%424313336%51%
1973
16th to endDay
13%424323336%51%
1890
December1st to 15thDay
17%7%145%24246%41%
1890
16th to endDay
23%6%25%324446%37%
2016
January1st to 15thNight
15%6%24434345%45%
2717
16th to endNight
16%6%3342333448%
2912
February1st to 15thNight
16%413423446%46%
2508
16th to endNight
16%424424345%47%
2205
March1st to 15thNight
12%5%24424346%48%
2328
16th to endNight
12%43443445%6%46%
2464
April1st to 15thNight
12%323423347%52%
2306
16th to endNight
8%5%2442445%7%51%
1920
May1st to 15thNight
8%4235%25%47%8%45%
1889
16th to endNight
9%4245%45%6%5%9%41%
1970
June1st to 15thNight
8%425%5%36%6%8%11%37%
1765
16th to endNight
5%3245%36%7%9%12%39%
1755
July1st to 15thNight
7%5%36%6%47%6%8%10%32%
1755
16th to endNight
5%325%6%47%6%8%14%34%
1847
August1st to 15thNight
9%4246%46%7%9%13%31%
1726
16th to endNight
10%5%25%6%45%6%7%10%35%
2030
September1st to 15thNight
10%425%6%35%5%7%9%38%
2145
16th to endNight
14%5%245%33446%44%
2145
October1st to 15thNight
11%5%24313346%54%
2226
16th to endNight
8%313423336%58%
2496
November1st to 15thNight
13%323313337%54%
2542
16th to endNight
13%413424345%52%
2730
December1st to 15thNight
16%6%23422445%45%
2730
16th to endNight
20%6%25%423346%40%
2912

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
42%27%17%24%4
1882
16th to endDay
38%36%20%24%7%
2016
February1st to 15thDay
40%37%21%20%5%
2006
16th to endDay
42%25%21%21%6%
1840
March1st to 15thDay
38%36%21%19%9%
2292
16th to endDay
40%39%22%19%4
2464
April1st to 15thDay
35%39%21%22%6%
2302
16th to endDay
34%39%22%23%6%
2654
May1st to 15thDay
34%413%23%19%3
2721
16th to endDay
39%5%11%25%14%2
2851
June1st to 15thDay
39%6%16%24%12%1
2548
16th to endDay
31%7%18%25%14%3
2535
July1st to 15thDay
42%8%16%20%8%3
2396
16th to endDay
39%9%19%20%9%2
2518
August1st to 15thDay
44%7%14%20%10%2
2474
16th to endDay
47%8%15%16%10%1
2507
September1st to 15thDay
41%6%13%17%16%3
2145
16th to endDay
41%49%20%17%5%
2145
October1st to 15thDay
33%29%22%24%6%
2064
16th to endDay
31%1320%30%12%
2080
November1st to 15thDay
36%27%18%25%9%
1973
16th to endDay
35%26%20%25%8%
1890
December1st to 15thDay
44%28%19%17%6%
1890
16th to endDay
47%38%18%15%6%
2016
January1st to 15thNight
41%26%16%25%6%
2717
16th to endNight
41%2418%23%10%
2912
February1st to 15thNight
40%27%19%22%8%
2517
16th to endNight
39%36%19%22%7%
2205
March1st to 15thNight
37%39%16%23%9%
2328
16th to endNight
38%310%18%21%7%
2464
April1st to 15thNight
32%39%24%22%7%
2306
16th to endNight
31%310%20%22%10%
1920
May1st to 15thNight
33%5%15%22%17%5%
1890
16th to endNight
38%5%12%23%16%2
1972
June1st to 15thNight
37%7%17%24%11%1
1765
16th to endNight
33%8%18%22%12%3
1755
July1st to 15thNight
41%8%19%17%8%3
1665
16th to endNight
37%10%22%19%8%2
1739
August1st to 15thNight
40%9%17%20%10%1
1715
16th to endNight
41%7%19%19%10%1
2030
September1st to 15thNight
39%8%16%16%15%4
2145
16th to endNight
40%411%19%17%5%
2145
October1st to 15thNight
32%310%20%25%7%
2226
16th to endNight
29%25%18%30%13%
2496
November1st to 15thNight
32%35%19%26%13%
2542
16th to endNight
34%26%18%26%11%
2730
December1st to 15thNight
40%39%19%20%7%
2730
16th to endNight
45%28%19%17%6%
2912

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
26%11%35%21%6%
180
16th to endDay
16%21%37%18%41
192
February1st to 15thDay
24%16%40%15%2
180
16th to endDay
29%13%33%22%1
159
March1st to 15thDay
20%15%29%27%5%
372
16th to endDay
18%10%34%22%12%
416
April1st to 15thDay
20%8%26%26%16%2
390
16th to endDay
14%5%25%29%20%5%
379
May1st to 15thDay
11%6%25%29%19%8%
408
16th to endDay
17%415%23%22%16%
459
June1st to 15thDay
12%28%24%32%19%
379
16th to endDay
9%14%25%27%22%
375
July1st to 15thDay
10%17%21%36%21%
365
16th to endDay
8%6%25%39%18%
390
August1st to 15thDay
16%19%22%31%18%
358
16th to endDay
14%19%21%31%21%
396
September1st to 15thDay
13%112%23%30%18%
375
16th to endDay
20%112%25%26%13%
374
October1st to 15thDay
18%417%28%17%13%
375
16th to endDay
13%6%24%25%23%6%
400
November1st to 15thDay
27%7%21%21%18%3
301
16th to endDay
9%11%30%28%17%3
180
December1st to 15thDay
30%12%31%19%6%
180
16th to endDay
31%12%36%13%41
192
January1st to 15thNight
20%15%26%28%8%
840
16th to endNight
21%15%29%27%5%
896
February1st to 15thNight
21%13%29%29%5%
824
16th to endNight
18%14%35%27%4
735
March1st to 15thNight
16%12%34%29%6%
840
16th to endNight
16%11%27%31%12%
896
April1st to 15thNight
15%9%30%29%14%
838
16th to endNight
12%7%24%34%19%1
663
May1st to 15thNight
12%323%35%21%2
630
16th to endNight
12%213%33%31%6%
659
June1st to 15thNight
9%19%33%35%9%
588
16th to endNight
7%110%31%36%12%
585
July1st to 15thNight
9%16%32%39%10%
555
16th to endNight
6%8%28%46%9%
612
August1st to 15thNight
11%5%28%44%9%
575
16th to endNight
13%29%25%40%8%
678
September1st to 15thNight
12%19%28%40%7%
780
16th to endNight
18%214%28%29%7%
777
October1st to 15thNight
15%418%29%24%7%
780
16th to endNight
11%6%23%32%23%2
832
November1st to 15thNight
16%5%22%31%21%2
820
16th to endNight
16%10%26%26%18%1
840
December1st to 15thNight
21%9%23%30%14%1
840
16th to endNight
24%11%26%28%8%
896
Page generated at 2019-06-02 19:43:08. Version ac04

Copyright 2019 A. Danko


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