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 2005-11-05 to 2019-06-10.

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
49%
17808
27%
53880
19%
17762
58%
17762
35%
30726

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
36%
1047
29%
2717
11%
1045
47%
1045
34%
1680
January16th to endNight
34%
1120
29%
2912
11%
1120
44%
1120
33%
1810
February1st to 15thNight
29%
877
24%
2518
9%
870
39%
870
26%
1602
February16th to endNight
23%
689
26%
2159
10%
689
37%
689
25%
1320
March1st to 15thNight
30%
630
27%
2310
15%
630
44%
630
23%
1375
March16th to endNight
34%
672
24%
2464
15%
672
47%
672
28%
1350
April1st to 15thNight
32%
629
26%
2304
14%
629
51%
629
30%
1225
April16th to endNight
35%
624
25%
2033
15%
624
50%
624
32%
1158
May1st to 15thNight
37%
629
23%
1890
17%
629
47%
629
30%
1140
May16th to endNight
53%
658
25%
1973
20%
657
64%
657
42%
1068
June1st to 15thNight
74%
612
26%
1836
27%
612
80%
612
52%
901
June16th to endNight
73%
585
23%
1755
27%
585
76%
585
43%
958
July1st to 15thNight
81%
555
24%
1665
29%
555
82%
555
47%
862
July16th to endNight
83%
612
25%
1738
30%
579
86%
579
49%
881
August1st to 15thNight
88%
575
33%
1717
38%
572
88%
572
56%
799
August16th to endNight
77%
621
23%
2077
28%
621
78%
621
35%
1149
September1st to 15thNight
72%
585
20%
2145
26%
585
73%
585
31%
1190
September16th to endNight
72%
582
30%
2145
32%
582
74%
582
34%
1129
October1st to 15thNight
71%
676
32%
2236
29%
676
74%
676
41%
1136
October16th to endNight
53%
832
35%
2496
21%
832
62%
832
44%
1293
November1st to 15thNight
48%
820
30%
2460
18%
820
56%
820
35%
1423
November16th to endNight
46%
1008
32%
2688
16%
1008
56%
1008
38%
1590
December1st to 15thNight
37%
1050
29%
2730
13%
1050
46%
1050
32%
1745
December16th to endNight
34%
1120
23%
2912
10%
1120
42%
1120
28%
1942

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%2442445%7%47%
54617
Night
10%423323347%53%
54082
TransparencyDay
35%5%10%21%18%7%
54317
Night
31%410%21%20%10%
53887
SeeingDay
12%419%28%26%9%
7706
Night
13%6%25%33%18%2
17813

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
15%5%24312345%50%
1881
16th to endDay
16%5%23322345%50%
2016
February1st to 15thDay
18%6%24423245%46%
2008
16th to endDay
19%7%25%323335%44%
1885
March1st to 15thDay
20%7%2441334442%
2310
16th to endDay
14%6%24423346%46%
2462
April1st to 15thDay
11%5%26%42445%8%43%
2302
16th to endDay
13%4245%3445%7%46%
2529
May1st to 15thDay
14%6%35%5%34447%40%
2721
16th to endDay
9%425%6%45%5%6%8%40%
2846
June1st to 15thDay
42134345%7%10%51%
2653
16th to endDay
8%313435%46%10%47%
2535
July1st to 15thDay
6%3135%35%5%7%10%45%
2535
16th to endDay
5%3245%25%5%7%10%46%
2674
August1st to 15thDay
42122245%6%8%59%
2486
16th to endDay
7%415%6%35%5%6%9%43%
2470
September1st to 15thDay
11%5%25%5%35%5%6%7%42%
2145
16th to endDay
8%324435%5%5%6%49%
2145
October1st to 15thDay
10%313324447%53%
2041
16th to endDay
11%21221223464%
2080
November1st to 15thDay
11%5%25%423447%47%
2058
16th to endDay
12%5%13324335%55%
1929
December1st to 15thDay
16%8%24313335%46%
1890
16th to endDay
17%8%34323346%41%
2016
January1st to 15thNight
15%5%23213235%52%
2717
16th to endNight
15%424323335%52%
2912
February1st to 15thNight
17%6%2432233449%
2515
16th to endNight
16%6%24423335%47%
2159
March1st to 15thNight
16%6%2442235%7%45%
2310
16th to endNight
10%423314446%52%
2464
April1st to 15thNight
8%424423447%53%
2304
16th to endNight
12%32342335%7%51%
2033
May1st to 15thNight
10%425%42445%8%47%
1889
16th to endNight
6%31332346%11%53%
1971
June1st to 15thNight
31222345%9%63%
1836
16th to endNight
432332345%8%58%
1755
July1st to 15thNight
421231445%11%58%
1755
16th to endNight
211232348%10%57%
1846
August1st to 15thNight
211221235%10%66%
1727
16th to endNight
6%3144245%6%10%50%
2077
September1st to 15thNight
9%41342446%7%50%
2145
16th to endNight
7%423333448%53%
2145
October1st to 15thNight
8%213323346%60%
2236
16th to endNight
11%31231223463%
2496
November1st to 15thNight
9%5%24324335%55%
2460
16th to endNight
13%41332333456%
2688
December1st to 15thNight
16%5%24412246%48%
2730
16th to endNight
17%7%25%322345%45%
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
37%36%18%23%10%
1882
16th to endDay
37%36%16%25%10%
2016
February1st to 15thDay
42%35%16%21%10%
2009
16th to endDay
44%35%15%18%12%
1885
March1st to 15thDay
44%46%15%20%7%
2310
16th to endDay
40%48%18%22%5%
2464
April1st to 15thDay
38%6%8%20%16%10%
2302
16th to endDay
37%410%17%21%7%
2529
May1st to 15thDay
42%6%9%19%16%6%
2721
16th to endDay
39%7%12%22%17%1
2850
June1st to 15thDay
26%6%14%31%17%3
2653
16th to endDay
32%6%14%25%17%2
2535
July1st to 15thDay
29%8%21%26%12%
2396
16th to endDay
29%7%18%29%14%1
2519
August1st to 15thDay
20%5%17%34%19%2
2472
16th to endDay
35%8%15%25%13%2
2470
September1st to 15thDay
38%7%13%19%12%7%
2145
16th to endDay
33%6%9%23%18%8%
2145
October1st to 15thDay
30%5%12%19%17%14%
2041
16th to endDay
25%25%14%32%18%
2080
November1st to 15thDay
36%49%22%18%9%
2058
16th to endDay
32%46%15%25%15%
1929
December1st to 15thDay
41%48%17%18%9%
1890
16th to endDay
45%36%18%19%6%
2016
January1st to 15thNight
34%36%18%22%15%
2717
16th to endNight
36%2415%25%15%
2912
February1st to 15thNight
40%35%13%21%14%
2525
16th to endNight
39%37%15%18%14%
2159
March1st to 15thNight
39%48%13%23%11%
2310
16th to endNight
32%5%11%20%23%6%
2464
April1st to 15thNight
30%410%22%19%13%
2304
16th to endNight
32%5%11%17%23%10%
2033
May1st to 15thNight
35%5%12%21%17%7%
1890
16th to endNight
24%5%17%29%17%3
1973
June1st to 15thNight
16%6%14%35%22%3
1836
16th to endNight
24%6%15%27%22%3
1755
July1st to 15thNight
21%6%20%33%16%1
1665
16th to endNight
17%8%22%35%14%1
1738
August1st to 15thNight
14%6%17%35%22%4
1717
16th to endNight
28%7%18%30%11%3
2077
September1st to 15thNight
31%6%16%22%15%7%
2145
16th to endNight
28%5%11%22%22%9%
2145
October1st to 15thNight
24%411%24%18%15%
2236
16th to endNight
25%25%16%27%22%
2496
November1st to 15thNight
32%38%23%21%11%
2460
16th to endNight
31%35%15%26%16%
2688
December1st to 15thNight
38%38%18%20%10%
2730
16th to endNight
42%36%16%19%10%
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
18%7%33%27%11%1
180
16th to endDay
19%9%39%22%7%1
192
February1st to 15thDay
24%11%33%24%5%
180
16th to endDay
31%10%38%16%3
159
March1st to 15thDay
24%12%40%16%5%
180
16th to endDay
5%11%43%28%9%1
192
April1st to 15thDay
17%12%37%22%8%1
181
16th to endDay
15%8%33%28%11%1
421
May1st to 15thDay
14%8%31%31%12%1
618
16th to endDay
11%5%26%30%21%5%
677
June1st to 15thDay
5%11%43%29%9%
616
16th to endDay
7%9%33%36%12%
570
July1st to 15thDay
5%6%34%38%15%
550
16th to endDay
3426%47%18%
595
August1st to 15thDay
4327%47%16%
549
16th to endDay
11%421%40%20%
382
September1st to 15thDay
10%315%39%31%
180
16th to endDay
7%1324%42%21%
180
October1st to 15thDay
6%112%27%36%16%
180
16th to endDay
19%6%15%23%25%8%
192
November1st to 15thDay
25%5%29%23%12%2
180
16th to endDay
16%8%25%31%15%3
180
December1st to 15thDay
28%328%20%14%3
180
16th to endDay
31%8%35%20%4
192
January1st to 15thNight
18%8%30%30%10%
1050
16th to endNight
18%10%33%31%6%
1120
February1st to 15thNight
22%10%33%28%4
877
16th to endNight
21%12%40%22%3
689
March1st to 15thNight
18%10%37%26%7%
630
16th to endNight
13%9%41%30%6%
672
April1st to 15thNight
9%10%43%29%6%
629
16th to endNight
13%6%40%26%11%
624
May1st to 15thNight
11%6%39%31%10%
630
16th to endNight
6%331%39%17%2
659
June1st to 15thNight
316%47%28%2
612
16th to endNight
5%13%47%28%4
585
July1st to 15thNight
36%47%37%4
555
16th to endNight
2441%46%5%
612
August1st to 15thNight
3242%46%5%
575
16th to endNight
8%5%36%42%7%
621
September1st to 15thNight
10%6%33%42%6%
585
16th to endNight
10%8%31%42%6%
582
October1st to 15thNight
9%114%40%27%6%
676
16th to endNight
12%6%24%33%21%2
832
November1st to 15thNight
12%6%28%33%17%1
820
16th to endNight
16%6%26%33%14%1
1008
December1st to 15thNight
19%8%30%31%9%
1050
16th to endNight
22%8%30%29%8%
1120
Page generated at 2019-06-10 18:29:46. Version ac04

Copyright 2019 A. Danko


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