Fort Parker State Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Fort Parker State Park clear sky chart from 2005-11-06 to 2024-01-22.

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%
23916
27%
74342
18%
23861
57%
23861
34%
42176

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 10thNight
33%
947
30%
2458
11%
946
46%
946
36%
1499
January11th to 20thNight
31%
950
27%
2470
9%
950
42%
950
32%
1554
January21st to endNight
33%
1000
29%
2600
11%
1000
43%
1000
32%
1635
February1st to 10thNight
27%
788
25%
2228
9%
788
38%
788
26%
1430
February11th to 20thNight
24%
704
22%
2098
8%
700
35%
700
26%
1318
February21st to endNight
19%
531
27%
1715
8%
531
36%
531
23%
1048
March1st to 10thNight
27%
540
24%
1980
12%
540
41%
540
22%
1201
March11th to 20thNight
31%
540
23%
1980
14%
540
43%
540
23%
1176
March21st to endNight
31%
594
26%
2178
14%
594
46%
594
28%
1195
April1st to 10thNight
31%
540
26%
1980
14%
540
50%
540
28%
1091
April11th to 20thNight
30%
533
24%
1861
14%
533
46%
533
27%
1054
April21st to endNight
32%
540
27%
1742
14%
540
51%
540
32%
993
May1st to 10thNight
35%
540
24%
1620
15%
540
46%
540
32%
961
May11th to 20thNight
44%
531
22%
1594
20%
531
52%
531
34%
932
May21st to endNight
53%
583
24%
1746
18%
582
63%
582
35%
1025
June1st to 10thNight
69%
540
23%
1620
23%
540
75%
540
44%
856
June11th to 20thNight
70%
540
26%
1620
27%
540
77%
540
53%
786
June21st to endNight
74%
540
24%
1620
28%
540
76%
540
41%
901
July1st to 10thNight
75%
525
21%
1575
25%
525
77%
525
41%
872
July11th to 20thNight
85%
522
28%
1566
33%
522
87%
522
55%
745
July21st to endNight
83%
591
24%
1673
28%
558
87%
558
48%
857
August1st to 10thNight
89%
537
34%
1601
38%
534
90%
534
64%
697
August11th to 20thNight
76%
534
28%
1600
31%
534
78%
534
41%
866
August21st to endNight
81%
594
25%
2078
30%
594
82%
594
39%
1068
September1st to 10thNight
74%
540
23%
1980
28%
540
76%
540
35%
1053
September11th to 20thNight
70%
540
24%
1980
27%
540
72%
540
31%
1078
September21st to endNight
75%
540
32%
1980
35%
540
78%
540
41%
948
October1st to 10thNight
75%
575
35%
2015
34%
575
78%
575
46%
936
October11th to 20thNight
56%
720
33%
2160
20%
720
66%
720
40%
1177
October21st to endNight
45%
792
33%
2376
19%
792
55%
792
38%
1310
November1st to 10thNight
52%
740
31%
2220
20%
740
60%
740
38%
1244
November11th to 20thNight
48%
798
30%
2318
17%
798
58%
798
37%
1326
November21st to endNight
38%
950
27%
2470
13%
950
47%
950
31%
1582
December1st to 10thNight
38%
950
31%
2470
14%
950
48%
950
35%
1528
December11th to 20thNight
32%
949
27%
2866
11%
948
40%
948
24%
1842
December21st to endNight
34%
1038
18%
4304
12%
1026
43%
1026
22%
2392

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
11%5%2443445%7%48%
75014
Night
11%5%2442345%7%54%
74946
TransparencyDay
35%6%10%21%20%8%
74739
Night
31%5%10%21%22%11%
74741
SeeingDay
12%6%20%28%24%9%
13910
Night
13%7%27%34%17%2
23928

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 10thDay
15%6%2442335%6%52%
1707
11th to 20thDay
17%6%3432345%6%48%
1710
21st to endDay
17%6%34333345%51%
1791
February1st to 10thDay
20%6%36%423346%44%
1746
11th to 20thDay
19%8%35%5%33345%43%
1749
21st to endDay
20%6%35%32333448%
1538
March1st to 10thDay
19%7%35%5%24345%42%
1980
11th to 20thDay
17%7%35%5%34445%43%
1980
21st to endDay
15%7%35%42445%6%47%
2178
April1st to 10thDay
14%6%36%43446%8%42%
1980
11th to 20thDay
13%6%36%5%35%45%8%40%
2045
21st to endDay
14%4245%3445%7%48%
2213
May1st to 10thDay
12%6%36%6%3445%7%43%
2340
11th to 20thDay
13%5%26%6%445%5%9%42%
2302
21st to endDay
12%5%36%6%36%6%8%9%36%
2531
June1st to 10thDay
5%3245%35%5%7%11%50%
2340
11th to 20thDay
5%2235%35%5%7%9%52%
2340
21st to endDay
6%4245%36%5%6%11%49%
2340
July1st to 10thDay
7%425%6%46%7%8%10%40%
2340
11th to 20thDay
43134245%7%11%56%
2340
21st to endDay
4335%5%35%5%8%10%51%
2546
August1st to 10thDay
32133245%6%8%63%
2328
11th to 20thDay
6%324435%5%7%10%52%
2301
21st to endDay
6%3146%46%7%6%9%48%
2271
September1st to 10thDay
9%5%345%35%5%5%7%48%
1980
11th to 20thDay
11%425%5%345%6%7%47%
1980
21st to endDay
7%323436%5%5%7%55%
1980
October1st to 10thDay
7%313424448%60%
1926
11th to 20thDay
14%423323346%57%
1800
21st to endDay
15%32332333459%
1980
November1st to 10thDay
12%6%25%423447%50%
1858
11th to 20thDay
9%425%5%24447%53%
1858
21st to endDay
17%7%24424436%47%
1710
December1st to 10thDay
14%7%25%423445%49%
1710
11th to 20thDay
16%6%35%434447%44%
2161
21st to endDay
15%9%35%423335%49%
3135
January1st to 10thNight
15%5%2432325%5%55%
2458
11th to 20thNight
17%6%24323335%53%
2470
21st to endNight
15%5%35%324435%51%
2600
February1st to 10thNight
18%7%24323445%48%
2228
11th to 20thNight
19%6%25%423335%48%
2098
21st to endNight
19%6%24423345%48%
1715
March1st to 10thNight
16%6%25%43336%7%43%
1980
11th to 20thNight
14%6%244346%46%47%
1980
21st to endNight
12%5%2342345%7%53%
2178
April1st to 10thNight
10%5%25%3235%5%8%52%
1980
11th to 20thNight
13%4345%34448%49%
1861
21st to endNight
12%42442336%7%52%
1742
May1st to 10thNight
9%435%5%3445%9%49%
1620
11th to 20thNight
12%42433446%8%49%
1593
21st to endNight
8%5%2443446%10%50%
1745
June1st to 10thNight
5%2133245%6%10%59%
1620
11th to 20thNight
421322445%9%65%
1620
21st to endNight
43244345%6%8%57%
1620
July1st to 10thNight
4424435%5%6%12%52%
1620
11th to 20thNight
31232345%10%67%
1620
21st to endNight
22134345%8%11%56%
1772
August1st to 10thNight
111121235%11%71%
1611
11th to 20thNight
7%32443346%9%56%
1600
21st to endNight
33244346%7%12%53%
2078
September1st to 10thNight
8%424425%46%8%55%
1980
11th to 20thNight
10%5%3342446%6%53%
1980
21st to endNight
6%323333448%61%
1980
October1st to 10thNight
5%313323446%66%
2015
11th to 20thNight
13%413323346%59%
2160
21st to endNight
13%42342233460%
2376
November1st to 10thNight
10%5%24223336%59%
2220
11th to 20thNight
9%424434436%57%
2318
21st to endNight
18%5%24323445%49%
2470
December1st to 10thNight
14%5%2442335%6%52%
2470
11th to 20thNight
15%7%36%423346%47%
3036
21st to endNight
16%7%25%32223453%
4532

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 10thDay
36%37%18%25%10%
1708
11th to 20thDay
39%5%6%20%23%9%
1710
21st to endDay
39%25%16%26%12%
1791
February1st to 10thDay
44%5%5%14%21%12%
1746
11th to 20thDay
45%47%16%20%9%
1759
21st to endDay
43%35%15%18%16%
1538
March1st to 10thDay
44%5%6%15%22%8%
1980
11th to 20thDay
45%5%7%13%21%9%
1980
21st to endDay
39%5%7%18%22%7%
2178
April1st to 10thDay
41%7%8%20%15%10%
1980
11th to 20thDay
42%5%9%17%18%9%
2045
21st to endDay
36%5%10%20%23%7%
2213
May1st to 10thDay
40%6%8%22%18%7%
2340
11th to 20thDay
40%7%11%21%19%2
2306
21st to endDay
42%8%12%21%15%1
2531
June1st to 10thDay
27%7%16%31%17%3
2340
11th to 20thDay
26%8%16%31%15%5%
2340
21st to endDay
30%7%14%27%19%3
2340
July1st to 10thDay
34%10%20%24%11%1
2276
11th to 20thDay
21%7%20%30%19%2
2271
21st to endDay
25%9%19%33%13%1
2405
August1st to 10thDay
18%6%17%37%21%2
2314
11th to 20thDay
26%8%18%29%16%3
2301
21st to endDay
31%9%13%29%15%3
2271
September1st to 10thDay
35%6%12%20%18%9%
1980
11th to 20thDay
35%8%13%19%17%7%
1980
21st to endDay
27%6%9%24%20%14%
1980
October1st to 10thDay
25%5%12%21%21%16%
1926
11th to 20thDay
32%47%14%26%18%
1800
21st to endDay
31%35%16%27%18%
1980
November1st to 10thDay
35%5%8%19%23%10%
1858
11th to 20thDay
32%5%8%17%24%13%
1858
21st to endDay
41%5%6%17%20%12%
1710
December1st to 10thDay
38%5%9%20%20%9%
1710
11th to 20thDay
42%46%15%23%10%
2159
21st to endDay
40%3417%25%11%
3135
January1st to 10thNight
33%45%19%25%15%
2458
11th to 20thNight
36%36%18%25%12%
2470
21st to endNight
37%3415%23%17%
2600
February1st to 10thNight
41%45%13%21%16%
2228
11th to 20thNight
41%36%14%23%12%
2098
21st to endNight
41%48%13%17%18%
1715
March1st to 10thNight
40%6%8%13%21%12%
1980
11th to 20thNight
38%6%9%13%25%9%
1980
21st to endNight
32%6%10%19%23%10%
2178
April1st to 10thNight
32%6%9%22%18%13%
1980
11th to 20thNight
35%411%18%18%14%
1861
21st to endNight
32%6%10%18%26%8%
1742
May1st to 10thNight
33%7%12%20%19%9%
1620
11th to 20thNight
33%5%15%26%19%4
1594
21st to endNight
30%7%15%29%16%2
1746
June1st to 10thNight
21%8%16%33%20%3
1620
11th to 20thNight
17%6%16%35%20%6%
1620
21st to endNight
26%7%14%26%23%4
1620
July1st to 10thNight
25%8%21%32%13%2
1575
11th to 20thNight
14%7%20%36%21%2
1566
21st to endNight
17%10%25%34%14%1
1673
August1st to 10thNight
9%6%19%39%24%3
1601
11th to 20thNight
25%7%18%30%16%5%
1600
21st to endNight
23%8%17%33%15%4
2078
September1st to 10thNight
28%6%15%23%18%10%
1980
11th to 20thNight
31%6%15%19%20%9%
1980
21st to endNight
23%5%11%22%25%14%
1980
October1st to 10thNight
20%5%10%26%21%18%
2015
11th to 20thNight
29%37%17%24%20%
2160
21st to endNight
30%36%17%24%21%
2376
November1st to 10thNight
29%47%20%25%14%
2220
11th to 20thNight
30%47%20%24%14%
2318
21st to endNight
39%37%15%22%13%
2470
December1st to 10thNight
35%48%21%21%11%
2470
11th to 20thNight
41%35%12%24%14%
3037
21st to endNight
37%3414%29%13%
4532

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 10thDay
20%13%35%24%9%
270
11th to 20thDay
23%10%34%25%7%1
270
21st to endDay
21%13%40%20%6%
267
February1st to 10thDay
24%14%32%25%5%
240
11th to 20thDay
28%15%34%18%4
240
21st to endDay
28%17%36%16%3
198
March1st to 10thDay
23%14%38%20%5%
240
11th to 20thDay
18%19%36%20%5%1
240
21st to endDay
14%13%45%20%6%1
264
April1st to 10thDay
21%15%38%21%5%
240
11th to 20thDay
20%14%32%24%10%1
323
21st to endDay
16%9%37%28%8%1
473
May1st to 10thDay
11%13%33%33%9%1
603
11th to 20thDay
15%5%24%33%18%4
625
21st to endDay
13%5%24%33%21%5%
679
June1st to 10thDay
5%213%42%27%11%
630
11th to 20thDay
5%15%41%30%8%
630
21st to endDay
5%113%30%36%15%
630
July1st to 10thDay
6%18%34%35%16%
621
11th to 20thDay
21431%46%16%
618
21st to endDay
3428%50%16%
684
August1st to 10thDay
2331%45%18%
626
11th to 20thDay
7%427%46%16%
615
21st to endDay
7%2415%41%32%
390
September1st to 10thDay
10%1319%39%30%
270
11th to 20thDay
6%15%23%43%23%
270
21st to endDay
8%27%26%36%21%
270
October1st to 10thDay
3216%28%40%11%
270
11th to 20thDay
12%8%19%30%24%8%
270
21st to endDay
23%10%23%21%16%7%
297
November1st to 10thDay
20%425%31%15%6%
270
11th to 20thDay
16%7%28%30%17%2
270
21st to endDay
20%14%28%26%10%1
270
December1st to 10thDay
17%7%27%30%14%4
270
11th to 20thDay
23%12%32%27%5%
270
21st to endDay
23%8%40%20%8%1
297
January1st to 10thNight
18%11%34%29%7%
950
11th to 20thNight
20%12%33%29%6%
950
21st to endNight
18%12%34%30%6%
1000
February1st to 10thNight
23%13%34%27%4
788
11th to 20thNight
24%10%39%23%3
704
21st to endNight
24%16%39%19%2
531
March1st to 10thNight
19%13%38%26%5%
540
11th to 20thNight
17%9%39%27%7%
540
21st to endNight
14%12%41%27%5%
594
April1st to 10thNight
11%10%45%29%5%
540
11th to 20thNight
13%13%40%26%8%
533
21st to endNight
14%7%44%24%10%1
540
May1st to 10thNight
10%8%42%31%8%1
540
11th to 20thNight
12%5%33%33%15%1
531
21st to endNight
8%5%29%41%15%2
584
June1st to 10thNight
5%218%41%31%3
540
11th to 20thNight
4120%55%20%1
540
21st to endNight
5%113%43%33%5%
540
July1st to 10thNight
410%45%37%4
525
11th to 20thNight
37%51%36%4
522
21st to endNight
115%47%42%4
591
August1st to 10thNight
15%49%41%4
537
11th to 20thNight
9%5%44%38%4
534
21st to endNight
46%37%45%8%
594
September1st to 10thNight
9%17%37%40%6%
540
11th to 20thNight
11%16%36%41%4
540
21st to endNight
8%29%37%39%5%
540
October1st to 10thNight
5%215%48%25%6%
575
11th to 20thNight
14%322%38%20%3
720
21st to endNight
14%9%29%31%16%1
792
November1st to 10thNight
12%5%27%37%17%2
740
11th to 20thNight
9%9%29%39%13%1
798
21st to endNight
20%10%28%30%11%1
950
December1st to 10thNight
17%8%32%33%9%1
950
11th to 20thNight
22%10%31%31%7%
950
21st to endNight
20%10%32%30%8%
1045
Page generated at 2024-01-19 08:28:36. Version ac07

Copyright 2024 Attilla Danko


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