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 2017-09-22.

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
50%
15512
27%
46964
19%
15466
59%
15466
36%
26485

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
35%
897
27%
2327
11%
895
45%
895
33%
1445
January16th to endNight
35%
960
30%
2496
11%
960
45%
960
34%
1546
February1st to 15thNight
32%
749
26%
2150
10%
742
44%
742
29%
1311
February16th to endNight
24%
591
29%
1853
11%
591
40%
591
28%
1079
March1st to 15thNight
32%
540
26%
1980
16%
540
46%
540
24%
1167
March16th to endNight
34%
576
24%
2112
15%
576
47%
576
28%
1154
April1st to 15thNight
32%
539
25%
1974
13%
539
51%
539
31%
1047
April16th to endNight
35%
540
25%
1761
15%
540
50%
540
31%
1017
May1st to 15thNight
35%
539
22%
1620
15%
539
46%
539
30%
973
May16th to endNight
54%
562
26%
1685
22%
561
64%
561
40%
930
June1st to 15thNight
74%
540
25%
1620
25%
540
80%
540
52%
799
June16th to endNight
74%
540
24%
1620
27%
540
77%
540
42%
888
July1st to 15thNight
80%
510
24%
1530
29%
510
82%
510
47%
795
July16th to endNight
82%
564
25%
1594
30%
531
86%
531
47%
818
August1st to 15thNight
88%
539
33%
1610
39%
536
88%
536
56%
747
August16th to endNight
76%
573
24%
1917
28%
573
76%
573
33%
1093
September1st to 15thNight
74%
540
22%
1980
27%
540
75%
540
34%
1056
September16th to endNight
74%
513
32%
1891
34%
513
76%
513
37%
944
October1st to 15thNight
69%
572
34%
1892
30%
572
73%
572
42%
949
October16th to endNight
55%
704
36%
2112
22%
704
64%
704
47%
1060
November1st to 15thNight
50%
700
31%
2100
19%
700
59%
700
38%
1173
November16th to endNight
45%
864
31%
2304
17%
864
54%
864
36%
1386
December1st to 15thNight
38%
900
29%
2340
14%
900
46%
900
32%
1482
December16th to endNight
37%
960
24%
2496
11%
960
45%
960
30%
1626

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%42442445%7%48%
47903
Night
10%413323347%54%
47166
TransparencyDay
35%5%10%21%19%7%
47603
Night
30%410%21%21%11%
46971
SeeingDay
10%317%29%29%10%
5512
Night
12%5%25%33%19%2
15517

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%6%14312235%51%
1611
16th to endDay
16%5%22322345%51%
1728
February1st to 15thDay
16%5%2432224450%
1714
16th to endDay
15%6%24313345%49%
1619
March1st to 15thDay
20%6%2441334444%
1980
16th to endDay
15%6%34423345%46%
2110
April1st to 15thDay
11%6%25%425%45%8%43%
1972
16th to endDay
13%4245%3445%7%44%
2196
May1st to 15thDay
14%6%35%434447%41%
2331
16th to endDay
10%5%26%6%35%6%7%8%37%
2430
June1st to 15thDay
43134345%7%10%50%
2340
16th to endDay
7%313435%47%10%47%
2340
July1st to 15thDay
7%3135%35%6%7%10%45%
2340
16th to endDay
6%325%5%25%5%7%10%44%
2466
August1st to 15thDay
42122245%6%9%59%
2340
16th to endDay
7%425%6%36%6%6%9%40%
2279
September1st to 15thDay
10%424435%5%6%7%44%
1980
16th to endDay
8%214425%5%5%7%53%
1881
October1st to 15thDay
11%213323347%55%
1727
16th to endDay
10%21221223466%
1760
November1st to 15thDay
10%424423447%50%
1758
16th to endDay
13%5%13424325%54%
1653
December1st to 15thDay
16%8%24413335%45%
1620
16th to endDay
15%8%34323346%43%
1728
January1st to 15thNight
16%5%23213235%52%
2327
16th to endNight
16%424223335%53%
2496
February1st to 15thNight
15%5%2331233453%
2147
16th to endNight
14%5%14412335%52%
1853
March1st to 15thNight
16%5%2442235%6%46%
1980
16th to endNight
11%423314446%53%
2112
April1st to 15thNight
7%424323447%54%
1974
16th to endNight
12%323424347%50%
1761
May1st to 15thNight
10%32442435%8%48%
1619
16th to endNight
7%31332346%10%52%
1683
June1st to 15thNight
31222345%9%64%
1620
16th to endNight
432332445%8%57%
1620
July1st to 15thNight
421331445%11%57%
1620
16th to endNight
311332348%11%56%
1702
August1st to 15thNight
21122123410%67%
1620
16th to endNight
6%3144345%6%10%47%
1917
September1st to 15thNight
8%31342446%7%53%
1980
16th to endNight
7%322333348%57%
1891
October1st to 15thNight
8%213323346%61%
1892
16th to endNight
9%31221224466%
2112
November1st to 15thNight
8%414324335%58%
2100
16th to endNight
15%41322233456%
2304
December1st to 15thNight
15%5%2441225%6%48%
2340
16th to endNight
15%7%25%322345%47%
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
37%36%17%24%11%
1612
16th to endDay
37%36%15%24%12%
1728
February1st to 15thDay
39%3417%22%11%
1715
16th to endDay
38%35%17%20%13%
1619
March1st to 15thDay
44%45%16%21%8%
1980
16th to endDay
41%47%16%24%5%
2112
April1st to 15thDay
39%6%8%19%15%11%
1972
16th to endDay
38%411%16%20%8%
2196
May1st to 15thDay
42%6%8%18%17%7%
2331
16th to endDay
41%7%12%19%17%1
2434
June1st to 15thDay
26%6%14%29%18%3
2340
16th to endDay
31%7%15%26%16%2
2340
July1st to 15thDay
29%8%20%28%12%
2201
16th to endDay
30%8%19%27%12%1
2311
August1st to 15thDay
20%5%18%34%19%1
2326
16th to endDay
37%8%14%25%11%2
2279
September1st to 15thDay
36%6%14%21%13%8%
1980
16th to endDay
30%5%9%24%20%9%
1881
October1st to 15thDay
30%411%18%18%16%
1727
16th to endDay
23%25%15%35%18%
1760
November1st to 15thDay
33%49%22%19%10%
1758
16th to endDay
33%45%13%24%17%
1653
December1st to 15thDay
41%47%19%18%8%
1620
16th to endDay
42%47%19%18%7%
1728
January1st to 15thNight
35%35%16%22%16%
2327
16th to endNight
35%2416%24%16%
2496
February1st to 15thNight
36%3413%24%16%
2157
16th to endNight
35%37%16%19%16%
1853
March1st to 15thNight
39%47%13%23%11%
1980
16th to endNight
32%5%10%19%24%7%
2112
April1st to 15thNight
30%410%22%18%14%
1974
16th to endNight
33%5%11%17%20%11%
1761
May1st to 15thNight
35%5%12%19%18%8%
1620
16th to endNight
25%6%19%27%16%4
1685
June1st to 15thNight
17%6%13%34%24%4
1620
16th to endNight
24%6%16%26%22%3
1620
July1st to 15thNight
21%6%19%34%16%1
1530
16th to endNight
18%8%23%35%12%1
1594
August1st to 15thNight
14%5%17%35%22%3
1610
16th to endNight
30%7%17%30%9%3
1917
September1st to 15thNight
29%5%16%23%16%8%
1980
16th to endNight
26%411%23%23%11%
1891
October1st to 15thNight
24%410%22%20%17%
1892
16th to endNight
23%25%18%27%23%
2112
November1st to 15thNight
29%38%22%23%12%
2100
16th to endNight
33%35%13%25%18%
2304
December1st to 15thNight
37%38%19%20%10%
2340
16th to endNight
40%36%17%20%11%
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
17%10%33%28%7%2
90
16th to endDay
15%10%44%21%6%1
96
February1st to 15thDay
7%11%37%33%10%
90
16th to endDay
13%8%48%23%6%
81
March1st to 15thDay
28%12%31%18%7%1
90
16th to endDay
5%7%42%28%14%2
96
April1st to 15thDay
19%9%30%23%13%3
91
16th to endDay
16%8%32%29%12%1
306
May1st to 15thDay
13%9%34%29%11%1
468
16th to endDay
13%5%28%28%19%4
517
June1st to 15thDay
5%11%41%30%10%
495
16th to endDay
7%8%32%36%13%
495
July1st to 15thDay
5%6%37%37%12%
475
16th to endDay
3425%46%18%
515
August1st to 15thDay
4226%48%17%
493
16th to endDay
13%5%23%39%16%
319
September1st to 15thDay
2218%43%31%
135
16th to endDay
120%47%30%
108
October1st to 15thDay
10%34%48%6%
90
16th to endDay
13%7%10%22%36%9%
96
November1st to 15thDay
25%225%28%14%3
90
16th to endDay
21%10%24%28%11%4
90
December1st to 15thDay
31%221%22%16%6%
90
16th to endDay
26%9%38%20%5%
96
January1st to 15thNight
19%9%30%30%9%
900
16th to endNight
18%10%33%31%6%
960
February1st to 15thNight
20%10%33%30%4
749
16th to endNight
18%12%42%24%2
591
March1st to 15thNight
18%8%36%28%7%
540
16th to endNight
13%9%41%29%6%
576
April1st to 15thNight
8%10%45%29%6%
539
16th to endNight
14%7%40%25%11%
540
May1st to 15thNight
10%6%40%31%9%1
540
16th to endNight
6%330%39%17%2
563
June1st to 15thNight
316%45%30%2
540
16th to endNight
6%12%45%30%5%
540
July1st to 15thNight
37%49%35%3
510
16th to endNight
3438%48%5%
564
August1st to 15thNight
3240%48%5%
539
16th to endNight
8%5%34%42%8%
573
September1st to 15thNight
9%6%34%43%5%
540
16th to endNight
10%9%30%43%5%
513
October1st to 15thNight
9%216%40%26%5%
572
16th to endNight
10%6%24%32%23%1
704
November1st to 15thNight
10%6%29%32%19%1
700
16th to endNight
17%6%26%32%14%1
864
December1st to 15thNight
19%7%29%33%9%
900
16th to endNight
20%9%29%30%9%
960
Page generated at 2017-09-23 05:43:36. Version ac04

Copyright 2017 A. Danko


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