Salt Fork State Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Salt Fork State Park clear sky chart from 2005-11-06 to 2024-01-16.

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
35%
23829
16%
75005
11%
23779
42%
23779
19%
52281

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
15%
760
13%
2459
5%
757
23%
757
9%
1948
January11th to 20thNight
13%
744
9%
2417
3%
744
21%
744
9%
1929
January21st to endNight
16%
792
12%
2574
6%
792
23%
792
10%
2015
February1st to 10thNight
18%
720
10%
2340
5%
720
24%
720
10%
1838
February11th to 20thNight
14%
700
11%
2199
5%
700
21%
700
11%
1715
February21st to endNight
14%
592
13%
1776
5%
592
22%
592
10%
1391
March1st to 10thNight
21%
720
17%
2016
8%
720
30%
720
17%
1444
March11th to 20thNight
26%
720
19%
1980
10%
720
34%
720
19%
1406
March21st to endNight
23%
792
17%
2178
7%
792
32%
792
19%
1578
April1st to 10thNight
24%
720
16%
1954
6%
720
31%
720
20%
1395
April11th to 20thNight
30%
604
19%
1668
9%
604
38%
604
25%
1134
April21st to endNight
28%
540
18%
1620
7%
540
37%
540
22%
1094
May1st to 10thNight
33%
540
13%
1620
5%
540
39%
540
18%
1156
May11th to 20thNight
41%
531
16%
1592
9%
531
46%
531
22%
1092
May21st to endNight
55%
582
15%
1745
11%
582
59%
582
30%
1076
June1st to 10thNight
51%
508
17%
1588
14%
508
56%
508
28%
976
June11th to 20thNight
52%
384
19%
1464
18%
384
60%
384
26%
834
June21st to endNight
55%
540
17%
1620
15%
540
59%
540
31%
1000
July1st to 10thNight
62%
525
15%
1575
13%
525
64%
525
30%
986
July11th to 20thNight
62%
522
19%
1566
15%
522
66%
522
35%
921
July21st to endNight
60%
591
17%
1672
15%
558
62%
558
27%
1055
August1st to 10thNight
66%
537
19%
1600
15%
534
68%
534
30%
988
August11th to 20thNight
64%
534
21%
1598
18%
534
66%
534
29%
1013
August21st to endNight
63%
632
24%
1820
18%
632
66%
632
37%
1084
September1st to 10thNight
58%
720
23%
1907
15%
720
62%
720
34%
1205
September11th to 20thNight
65%
720
29%
1980
22%
720
69%
720
40%
1154
September21st to endNight
46%
720
24%
1980
17%
720
53%
720
29%
1281
October1st to 10thNight
49%
720
21%
2094
18%
720
55%
720
28%
1317
October11th to 20thNight
34%
720
21%
2160
13%
720
45%
720
22%
1444
October21st to endNight
30%
792
21%
2376
15%
792
39%
792
20%
1649
November1st to 10thNight
40%
740
24%
2372
18%
740
49%
740
28%
1422
November11th to 20thNight
27%
760
19%
2470
10%
760
38%
760
18%
1707
November21st to endNight
27%
760
16%
2591
12%
760
35%
760
14%
1868
December1st to 10thNight
18%
760
10%
2660
6%
760
24%
760
10%
2065
December11th to 20thNight
20%
759
10%
3252
6%
759
28%
759
9%
2417
December21st to endNight
16%
828
6%
4522
5%
817
22%
817
5%
3684

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
16%10%47%6%45%5%5%7%32%
74504
Night
16%10%47%5%3445%7%34%
75272
TransparencyDay
51%5%11%20%11%1
74225
Night
50%5%11%20%12%2
75070
SeeingDay
24%12%27%21%12%5%
13628
Night
22%10%25%27%13%2
23843

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
19%15%7%10%8%5%4345%21%
1706
11th to 20thDay
20%20%7%9%6%3334420%
1671
21st to endDay
19%19%6%12%8%3434419%
1782
February1st to 10thDay
22%15%7%9%6%3444423%
1620
11th to 20thDay
16%14%8%12%6%3345%6%24%
1645
21st to endDay
19%14%5%9%6%3433430%
1480
March1st to 10thDay
18%11%5%7%5%34446%32%
1944
11th to 20thDay
18%13%47%6%3445%6%29%
1980
21st to endDay
23%9%38%6%34445%29%
2178
April1st to 10thDay
15%11%5%6%7%35%5%47%33%
2004
11th to 20thDay
17%9%37%5%45%447%34%
2256
21st to endDay
20%8%36%6%35%5%5%8%31%
2340
May1st to 10thDay
20%8%36%7%46%5%6%7%28%
2340
11th to 20thDay
21%7%36%5%45%47%7%31%
2301
21st to endDay
10%6%25%7%5%7%7%7%9%36%
2531
June1st to 10thDay
12%7%35%6%46%7%6%7%37%
2355
11th to 20thDay
13%6%37%6%37%7%6%9%35%
2476
21st to endDay
12%5%35%6%47%6%7%9%36%
2340
July1st to 10thDay
11%7%35%6%45%5%7%9%37%
2340
11th to 20thDay
11%6%26%6%45%6%7%8%39%
2340
21st to endDay
11%6%36%5%47%6%7%10%35%
2547
August1st to 10thDay
10%5%35%7%5%7%7%8%9%34%
2327
11th to 20thDay
11%7%25%6%48%6%7%10%34%
2303
21st to endDay
10%5%25%6%5%5%5%7%10%40%
2516
September1st to 10thDay
15%6%345%3445%8%45%
2051
11th to 20thDay
9%5%35%445%5%6%10%45%
1980
21st to endDay
17%8%35%6%34447%39%
1980
October1st to 10thDay
14%8%35%6%345%6%7%40%
1864
11th to 20thDay
17%8%36%5%45%5%5%5%37%
1800
21st to endDay
23%9%36%5%34345%35%
1980
November1st to 10thDay
12%8%46%5%34446%46%
1704
11th to 20thDay
18%11%46%6%3445%6%34%
1710
21st to endDay
18%13%5%8%6%345%45%29%
1583
December1st to 10thDay
21%16%8%9%5%345%35%20%
1520
11th to 20thDay
19%17%7%10%7%34446%21%
1910
21st to endDay
24%22%6%9%7%34335%14%
3100
January1st to 10thNight
19%15%7%9%5%5%5%5%4422%
2459
11th to 20thNight
20%17%6%10%6%345%4420%
2417
21st to endNight
19%16%7%10%7%33345%23%
2574
February1st to 10thNight
22%14%5%9%6%35%44425%
2340
11th to 20thNight
20%13%6%9%7%45%44425%
2197
21st to endNight
21%15%5%8%6%34345%25%
1776
March1st to 10thNight
16%11%47%6%3445%5%34%
2016
11th to 20thNight
18%10%46%435%45%8%33%
1980
21st to endNight
21%10%36%5%24446%34%
2178
April1st to 10thNight
17%10%46%5%3445%6%35%
1954
11th to 20thNight
16%8%35%6%345%6%9%36%
1668
21st to endNight
16%9%36%435%5%5%7%37%
1620
May1st to 10thNight
19%7%46%7%45%5%6%7%30%
1620
11th to 20thNight
17%8%36%5%345%47%38%
1592
21st to endNight
9%425%5%36%6%8%10%42%
1744
June1st to 10thNight
9%436%6%35%5%6%9%45%
1588
11th to 20thNight
11%5%25%43447%12%42%
1464
21st to endNight
12%4245%35%46%10%45%
1620
July1st to 10thNight
8%6%36%5%26%6%5%9%44%
1620
11th to 20thNight
8%425%5%35%5%6%10%47%
1620
21st to endNight
8%6%25%7%46%6%8%9%39%
1771
August1st to 10thNight
5%5%26%7%35%8%8%9%42%
1611
11th to 20thNight
9%6%26%6%46%5%6%7%44%
1598
21st to endNight
8%5%24435%5%6%9%49%
1820
September1st to 10thNight
12%5%15%5%35%446%49%
1907
11th to 20thNight
10%42342436%9%53%
1980
21st to endNight
14%7%36%5%3435%6%45%
1980
October1st to 10thNight
14%5%26%5%345%5%7%45%
2094
11th to 20thNight
16%7%36%6%445%46%39%
2160
21st to endNight
24%8%35%5%3345%6%35%
2376
November1st to 10thNight
13%7%36%433447%46%
2372
11th to 20thNight
18%10%46%5%345%5%6%34%
2470
21st to endNight
21%11%5%6%435%45%6%29%
2591
December1st to 10thNight
24%14%6%9%5%34445%23%
2660
11th to 20thNight
18%17%6%8%5%3435%6%24%
3285
21st to endNight
23%20%6%8%6%34445%16%
4550

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
68%48%14%6%1
1707
11th to 20thDay
69%310%14%31
1671
21st to endDay
70%48%12%5%1
1782
February1st to 10thDay
66%310%13%7%1
1620
11th to 20thDay
62%5%8%17%8%1
1654
21st to endDay
61%28%18%9%2
1480
March1st to 10thDay
54%410%24%8%1
1944
11th to 20thDay
56%5%8%19%10%2
1980
21st to endDay
57%48%18%11%2
2178
April1st to 10thDay
51%5%10%20%11%3
2004
11th to 20thDay
49%5%11%16%16%3
2256
21st to endDay
51%6%9%20%12%2
2340
May1st to 10thDay
54%6%10%19%9%2
2340
11th to 20thDay
51%6%11%18%12%1
2305
21st to endDay
41%8%15%25%11%1
2531
June1st to 10thDay
43%8%12%23%13%1
2355
11th to 20thDay
43%7%14%22%12%1
2476
21st to endDay
42%7%14%22%13%2
2340
July1st to 10thDay
43%7%13%22%13%2
2275
11th to 20thDay
41%6%12%25%15%1
2271
21st to endDay
41%7%14%24%13%2
2405
August1st to 10thDay
41%8%13%25%13%
2314
11th to 20thDay
42%7%13%27%10%1
2303
21st to endDay
38%7%12%24%14%4
2516
September1st to 10thDay
38%412%22%19%4
2051
11th to 20thDay
35%414%27%17%2
1980
21st to endDay
46%5%9%23%17%1
1980
October1st to 10thDay
43%5%10%22%19%1
1864
11th to 20thDay
48%5%10%23%13%1
1800
21st to endDay
53%310%21%12%1
1980
November1st to 10thDay
40%49%28%15%3
1704
11th to 20thDay
52%48%22%10%3
1710
21st to endDay
57%5%9%19%9%1
1583
December1st to 10thDay
67%5%9%15%4
1520
11th to 20thDay
65%49%17%5%
1906
21st to endDay
74%5%9%8%3
3100
January1st to 10thNight
66%47%16%7%1
2459
11th to 20thNight
67%411%13%4
2417
21st to endNight
65%38%16%6%1
2574
February1st to 10thNight
64%5%9%16%6%1
2340
11th to 20thNight
63%48%16%8%1
2199
21st to endNight
63%47%15%8%2
1776
March1st to 10thNight
52%48%23%12%1
2016
11th to 20thNight
51%410%24%9%2
1980
21st to endNight
52%48%20%13%3
2178
April1st to 10thNight
50%5%9%20%14%2
1954
11th to 20thNight
44%5%12%18%18%3
1668
21st to endNight
46%5%11%21%15%2
1620
May1st to 10thNight
52%5%11%19%10%3
1620
11th to 20thNight
47%5%10%20%14%3
1593
21st to endNight
35%7%18%25%13%2
1745
June1st to 10thNight
37%6%11%25%17%3
1588
11th to 20thNight
34%7%15%23%18%2
1464
21st to endNight
35%7%13%25%18%2
1620
July1st to 10thNight
37%7%11%23%19%3
1575
11th to 20thNight
31%7%15%25%19%3
1566
21st to endNight
37%9%13%25%14%3
1672
August1st to 10thNight
34%9%15%26%17%
1600
11th to 20thNight
37%8%13%25%16%2
1598
21st to endNight
31%7%14%26%18%5%
1820
September1st to 10thNight
37%5%11%21%21%6%
1907
11th to 20thNight
29%5%13%27%24%2
1980
21st to endNight
40%411%22%22%1
1980
October1st to 10thNight
38%5%11%23%20%2
2094
11th to 20thNight
46%5%8%26%15%1
2160
21st to endNight
49%49%22%13%2
2376
November1st to 10thNight
38%411%25%18%4
2372
11th to 20thNight
51%49%21%13%2
2470
21st to endNight
56%411%21%7%1
2591
December1st to 10thNight
65%39%16%5%1
2660
11th to 20thNight
61%411%18%5%
3288
21st to endNight
71%5%9%12%3
4550

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
34%21%30%10%5%
270
11th to 20thDay
36%23%32%8%1
257
21st to endDay
34%25%31%7%2
264
February1st to 10thDay
38%20%33%9%1
240
11th to 20thDay
41%24%30%41
240
21st to endDay
38%24%33%5%
198
March1st to 10thDay
31%21%29%15%4
384
11th to 20thDay
31%18%32%14%5%1
420
21st to endDay
33%17%30%15%4
462
April1st to 10thDay
27%18%32%15%7%1
420
11th to 20thDay
27%17%28%16%8%4
412
21st to endDay
29%16%35%12%6%2
420
May1st to 10thDay
30%15%29%16%8%2
423
11th to 20thDay
22%11%32%21%9%5%
447
21st to endDay
15%7%25%29%17%7%
485
June1st to 10thDay
17%6%29%29%14%5%
450
11th to 20thDay
19%9%23%30%13%6%
450
21st to endDay
13%6%32%29%16%4
450
July1st to 10thDay
18%318%25%20%16%
445
11th to 20thDay
15%423%30%19%9%
444
21st to endDay
16%422%28%18%12%
488
August1st to 10thDay
14%317%34%22%11%
446
11th to 20thDay
18%417%32%19%10%
439
21st to endDay
12%423%29%23%10%
495
September1st to 10thDay
18%420%28%21%10%
450
11th to 20thDay
12%416%29%27%11%
450
21st to endDay
23%8%23%25%16%6%
450
October1st to 10thDay
17%7%26%27%19%4
450
11th to 20thDay
23%12%30%24%11%
450
21st to endDay
32%12%30%19%7%1
495
November1st to 10thDay
21%15%35%15%11%3
302
11th to 20thDay
30%15%29%18%6%2
270
21st to endDay
25%21%39%13%2
210
December1st to 10thDay
32%21%32%9%42
180
11th to 20thDay
31%22%32%11%3
180
21st to endDay
38%18%32%10%3
292
January1st to 10thNight
31%17%33%14%4
760
11th to 20thNight
32%17%31%16%3
744
21st to endNight
30%20%28%19%2
792
February1st to 10thNight
32%17%28%21%3
720
11th to 20thNight
30%19%33%17%1
703
21st to endNight
30%17%33%16%3
592
March1st to 10thNight
24%18%30%23%4
720
11th to 20thNight
26%17%27%22%6%1
720
21st to endNight
29%14%30%20%6%1
792
April1st to 10thNight
24%15%32%23%6%
720
11th to 20thNight
20%12%36%21%9%1
604
21st to endNight
21%9%35%27%6%1
540
May1st to 10thNight
21%9%28%27%13%1
540
11th to 20thNight
22%7%23%33%14%1
531
21st to endNight
11%421%35%26%3
584
June1st to 10thNight
10%425%39%21%1
508
11th to 20thNight
14%422%35%23%1
384
21st to endNight
13%320%39%23%2
540
July1st to 10thNight
11%215%40%26%7%
525
11th to 20thNight
10%217%37%29%5%
522
21st to endNight
11%213%39%30%4
591
August1st to 10thNight
8%312%41%33%4
537
11th to 20thNight
11%311%36%33%6%
534
21st to endNight
11%118%31%32%6%
632
September1st to 10thNight
14%316%31%31%5%
720
11th to 20thNight
11%414%34%32%5%
720
21st to endNight
17%7%21%31%20%4
720
October1st to 10thNight
16%6%20%33%22%3
720
11th to 20thNight
21%10%28%29%11%1
720
21st to endNight
29%10%26%26%8%1
792
November1st to 10thNight
19%9%29%30%13%1
740
11th to 20thNight
26%13%29%22%9%1
760
21st to endNight
29%13%27%26%5%
760
December1st to 10thNight
34%13%28%19%5%
760
11th to 20thNight
29%15%29%22%4
760
21st to endNight
34%13%30%21%2
836
Page generated at 2024-01-13 19:28:29. Version ac07

Copyright 2024 Attilla Danko


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