Sadlers Creek State Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Sadlers Creek State Park clear sky chart from 2005-11-06 to 2024-01-13.

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%
24039
22%
74379
15%
23982
56%
23982
26%
46715

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
30%
760
23%
2459
10%
757
45%
757
23%
1531
January11th to 20thNight
31%
732
23%
2378
12%
732
45%
732
22%
1492
January21st to endNight
27%
792
27%
2574
12%
792
45%
792
25%
1538
February1st to 10thNight
36%
720
25%
2205
14%
720
48%
720
27%
1377
February11th to 20thNight
26%
702
22%
2098
8%
699
41%
699
24%
1368
February21st to endNight
29%
592
24%
1776
12%
592
40%
592
24%
1152
March1st to 10thNight
37%
720
26%
2030
15%
720
46%
720
32%
1248
March11th to 20thNight
34%
720
20%
1980
9%
720
43%
720
27%
1312
March21st to endNight
38%
792
21%
2178
10%
792
46%
792
27%
1430
April1st to 10thNight
42%
720
25%
1980
13%
720
50%
720
32%
1197
April11th to 20thNight
46%
623
26%
1808
14%
623
55%
623
33%
1065
April21st to endNight
52%
540
29%
1620
20%
540
59%
540
34%
936
May1st to 10thNight
51%
540
20%
1620
12%
540
57%
540
31%
972
May11th to 20thNight
51%
531
14%
1593
9%
531
54%
531
24%
1064
May21st to endNight
61%
582
18%
1744
14%
582
63%
582
25%
1139
June1st to 10thNight
66%
540
15%
1620
13%
540
67%
540
25%
1085
June11th to 20thNight
67%
540
15%
1620
12%
540
68%
540
30%
1020
June21st to endNight
70%
540
14%
1620
12%
540
72%
540
27%
1053
July1st to 10thNight
64%
525
9%
1575
8%
525
64%
525
20%
1157
July11th to 20thNight
71%
522
10%
1566
9%
522
71%
522
24%
1060
July21st to endNight
69%
591
14%
1672
12%
558
69%
558
24%
1136
August1st to 10thNight
65%
537
10%
1600
9%
534
65%
534
20%
1134
August11th to 20thNight
64%
534
17%
1598
14%
534
65%
534
22%
1120
August21st to endNight
61%
642
15%
2005
14%
642
62%
642
20%
1380
September1st to 10thNight
67%
720
17%
1980
16%
720
67%
720
29%
1303
September11th to 20thNight
59%
720
19%
1980
16%
720
61%
720
27%
1344
September21st to endNight
60%
720
24%
1980
20%
720
64%
720
32%
1266
October1st to 10thNight
59%
720
27%
1984
22%
720
63%
720
36%
1189
October11th to 20thNight
55%
720
29%
2160
24%
720
63%
720
34%
1262
October21st to endNight
54%
792
33%
2376
27%
792
64%
792
38%
1314
November1st to 10thNight
55%
740
29%
2287
25%
740
63%
740
36%
1281
November11th to 20thNight
42%
760
28%
2470
20%
760
55%
760
31%
1407
November21st to endNight
47%
760
26%
2470
20%
760
57%
760
29%
1466
December1st to 10thNight
35%
760
24%
2470
14%
760
49%
760
21%
1605
December11th to 20thNight
39%
759
29%
2901
18%
758
52%
758
25%
1637
December21st to endNight
32%
831
15%
4402
13%
817
43%
817
12%
2675

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
14%5%245%345%6%8%44%
74889
Night
14%5%25%5%345%5%7%45%
74858
TransparencyDay
37%7%12%20%18%5%
74612
Night
38%7%11%19%20%6%
74654
SeeingDay
16%7%20%24%21%12%
13928
Night
16%6%21%32%21%4
24048

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
17%435%5%23446%46%
1706
11th to 20thDay
19%7%25%434445%44%
1638
21st to endDay
18%5%24323335%49%
1782
February1st to 10thDay
16%6%25%6%35%5%5%6%43%
1751
11th to 20thDay
22%435%323446%44%
1748
21st to endDay
21%7%245%24445%42%
1480
March1st to 10thDay
16%5%24423446%52%
1928
11th to 20thDay
18%5%35%5%345%5%7%41%
1980
21st to endDay
18%5%35%5%35%5%5%7%41%
2178
April1st to 10thDay
12%415%4445%6%7%49%
1980
11th to 20thDay
11%5%345%345%5%6%48%
2113
21st to endDay
10%42442445%8%54%
2340
May1st to 10thDay
9%4245%345%5%8%50%
2340
11th to 20thDay
13%5%25%5%35%5%6%9%42%
2301
21st to endDay
11%5%245%245%7%10%44%
2531
June1st to 10thDay
9%5%25%6%46%7%7%12%37%
2340
11th to 20thDay
6%3246%46%7%9%11%43%
2340
21st to endDay
6%315%6%47%6%9%12%41%
2340
July1st to 10thDay
9%6%37%6%5%6%7%8%11%32%
2340
11th to 20thDay
9%425%6%46%7%8%13%35%
2340
21st to endDay
7%435%6%5%6%7%8%12%37%
2547
August1st to 10thDay
10%5%36%6%5%7%8%8%10%32%
2327
11th to 20thDay
12%425%6%5%6%6%7%12%35%
2303
21st to endDay
12%5%36%6%46%6%7%10%34%
2327
September1st to 10thDay
9%4247%46%7%6%9%42%
1980
11th to 20thDay
14%5%245%346%5%8%44%
1980
21st to endDay
17%42432446%7%47%
1980
October1st to 10thDay
15%413313246%56%
1976
11th to 20thDay
13%42432334458%
1800
21st to endDay
12%424423245%57%
1980
November1st to 10thDay
14%5%23323346%56%
1786
11th to 20thDay
14%42432445%6%52%
1710
21st to endDay
15%5%235%24346%50%
1710
December1st to 10thDay
22%7%34433447%39%
1710
11th to 20thDay
19%42443335%5%48%
2153
21st to endDay
24%5%23423446%42%
3124
January1st to 10thNight
19%5%2442443447%
2459
11th to 20thNight
17%6%35%5%34446%44%
2378
21st to endNight
18%5%34423345%49%
2574
February1st to 10thNight
17%6%25%433346%47%
2205
11th to 20thNight
21%6%24423345%45%
2098
21st to endNight
19%5%2443445%6%43%
1776
March1st to 10thNight
15%5%24433346%50%
2030
11th to 20thNight
17%425%435%6%5%6%44%
1980
21st to endNight
15%6%25%4245%5%6%44%
2178
April1st to 10thNight
13%4145%3445%7%51%
1980
11th to 20thNight
11%5%34424347%53%
1808
21st to endNight
11%425%435%447%53%
1620
May1st to 10thNight
10%425%5%345%5%8%49%
1620
11th to 20thNight
13%426%6%46%6%6%9%39%
1592
21st to endNight
12%5%36%5%35%5%7%9%40%
1744
June1st to 10thNight
11%5%25%6%46%6%9%10%35%
1620
11th to 20thNight
8%5%245%45%5%7%10%44%
1620
21st to endNight
8%435%5%37%7%8%12%38%
1620
July1st to 10thNight
9%5%36%8%5%8%7%10%12%28%
1620
11th to 20thNight
8%5%25%6%5%7%7%10%13%33%
1620
21st to endNight
7%5%27%7%46%8%9%11%33%
1771
August1st to 10thNight
10%6%36%7%46%7%9%12%29%
1611
11th to 20thNight
12%5%36%6%46%7%7%9%35%
1598
21st to endNight
11%6%47%7%5%6%6%7%10%32%
2005
September1st to 10thNight
10%5%35%6%45%7%6%9%42%
1980
11th to 20thNight
16%6%245%345%7%6%40%
1980
21st to endNight
14%5%25%43445%6%48%
1980
October1st to 10thNight
14%42443345%6%52%
1984
11th to 20thNight
14%42442345%5%54%
2160
21st to endNight
13%313324336%59%
2376
November1st to 10thNight
13%5%23423336%56%
2287
11th to 20thNight
16%5%23413246%53%
2470
21st to endNight
17%42443445%7%47%
2470
December1st to 10thNight
19%6%35%5%34445%42%
2470
11th to 20thNight
18%424322345%53%
3042
21st to endNight
20%6%26%5%445%5%7%37%
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
39%5%7%21%22%6%
1707
11th to 20thDay
43%5%8%18%21%5%
1638
21st to endDay
38%36%22%23%8%
1782
February1st to 10thDay
42%49%20%18%7%
1751
11th to 20thDay
41%5%7%19%22%6%
1758
21st to endDay
44%6%8%15%19%9%
1480
March1st to 10thDay
35%48%19%23%11%
1928
11th to 20thDay
42%6%10%18%16%7%
1980
21st to endDay
42%6%10%21%19%3
2178
April1st to 10thDay
34%5%11%21%24%6%
1980
11th to 20thDay
36%6%8%20%20%10%
2113
21st to endDay
29%6%10%29%21%4
2340
May1st to 10thDay
32%6%14%23%20%5%
2340
11th to 20thDay
38%8%17%21%15%1
2305
21st to endDay
35%9%15%23%16%2
2531
June1st to 10thDay
38%11%19%22%9%2
2340
11th to 20thDay
31%12%19%25%12%1
2340
21st to endDay
34%12%19%20%12%4
2340
July1st to 10thDay
41%11%19%17%9%3
2275
11th to 20thDay
36%16%20%17%8%3
2271
21st to endDay
36%13%22%19%10%1
2405
August1st to 10thDay
42%12%19%19%8%
2314
11th to 20thDay
41%11%18%18%9%2
2303
21st to endDay
43%11%16%17%9%2
2327
September1st to 10thDay
37%9%15%17%18%3
1980
11th to 20thDay
39%8%12%18%20%3
1980
21st to endDay
36%7%10%22%19%6%
1980
October1st to 10thDay
31%5%10%20%28%6%
1976
11th to 20thDay
31%410%23%24%9%
1800
21st to endDay
31%45%20%30%11%
1980
November1st to 10thDay
30%5%8%18%29%11%
1786
11th to 20thDay
34%46%22%25%9%
1710
21st to endDay
36%48%20%25%7%
1710
December1st to 10thDay
46%5%8%18%17%6%
1710
11th to 20thDay
39%37%19%21%11%
2150
21st to endDay
42%47%21%23%3
3124
January1st to 10thNight
41%5%8%16%24%7%
2459
11th to 20thNight
42%48%18%22%6%
2378
21st to endNight
39%35%19%26%8%
2574
February1st to 10thNight
40%48%20%20%7%
2205
11th to 20thNight
44%45%18%23%7%
2099
21st to endNight
43%5%8%18%18%9%
1776
March1st to 10thNight
37%48%17%23%12%
2030
11th to 20thNight
39%8%11%13%22%7%
1980
21st to endNight
40%6%10%19%21%5%
2178
April1st to 10thNight
33%5%10%19%25%7%
1980
11th to 20thNight
33%47%22%23%11%
1808
21st to endNight
32%5%11%25%22%5%
1620
May1st to 10thNight
33%7%14%22%21%4
1620
11th to 20thNight
42%8%15%20%15%1
1593
21st to endNight
39%10%12%24%14%3
1745
June1st to 10thNight
40%10%18%20%11%2
1620
11th to 20thNight
34%10%18%24%12%2
1620
21st to endNight
35%12%19%17%12%4
1620
July1st to 10thNight
45%14%19%14%7%2
1575
11th to 20thNight
36%16%24%15%7%2
1566
21st to endNight
38%13%21%19%8%1
1672
August1st to 10thNight
42%14%20%18%6%
1600
11th to 20thNight
42%13%18%16%11%1
1598
21st to endNight
43%12%17%16%9%3
2005
September1st to 10thNight
38%8%17%17%15%4
1980
11th to 20thNight
41%8%13%19%17%2
1980
21st to endNight
36%6%11%19%20%7%
1980
October1st to 10thNight
33%411%18%27%7%
1984
11th to 20thNight
32%6%9%20%23%10%
2160
21st to endNight
29%46%20%29%13%
2376
November1st to 10thNight
32%48%18%27%12%
2287
11th to 20thNight
35%35%17%28%13%
2470
21st to endNight
37%47%19%26%7%
2470
December1st to 10thNight
45%46%19%19%7%
2470
11th to 20thNight
36%38%17%27%9%
3044
21st to endNight
45%6%8%20%18%4
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
23%15%34%23%6%
270
11th to 20thDay
26%16%25%25%8%
246
21st to endDay
20%21%36%18%5%1
264
February1st to 10thDay
20%16%33%25%5%
240
11th to 20thDay
35%12%35%16%2
240
21st to endDay
30%21%27%19%3
198
March1st to 10thDay
19%11%32%30%9%
368
11th to 20thDay
20%11%38%24%7%1
420
21st to endDay
20%14%31%24%10%1
462
April1st to 10thDay
16%15%25%28%15%1
420
11th to 20thDay
13%10%31%27%16%4
412
21st to endDay
17%9%21%26%18%8%
420
May1st to 10thDay
11%9%30%25%17%7%
423
11th to 20thDay
17%415%26%23%15%
447
21st to endDay
16%416%20%24%20%
485
June1st to 10thDay
12%313%26%28%17%
450
11th to 20thDay
8%414%25%26%24%
450
21st to endDay
11%311%28%28%21%
450
July1st to 10thDay
9%28%20%31%29%
445
11th to 20thDay
7%36%21%36%27%
444
21st to endDay
7%16%23%39%25%
488
August1st to 10thDay
13%410%22%26%24%
446
11th to 20thDay
12%16%21%36%22%
439
21st to endDay
13%39%22%31%23%
495
September1st to 10thDay
10%38%26%32%21%
450
11th to 20thDay
16%311%18%36%17%
450
21st to endDay
17%414%26%28%12%
450
October1st to 10thDay
20%415%27%22%12%
450
11th to 20thDay
13%6%21%30%26%6%
450
21st to endDay
16%6%22%29%22%5%
495
November1st to 10thDay
19%7%23%25%20%6%
384
11th to 20thDay
19%10%33%25%10%2
270
21st to endDay
13%10%29%29%16%3
270
December1st to 10thDay
29%11%28%25%7%
270
11th to 20thDay
23%10%31%26%7%3
270
21st to endDay
32%12%27%19%8%2
297
January1st to 10thNight
22%11%32%29%6%
760
11th to 20thNight
21%10%30%32%6%
732
21st to endNight
19%12%37%29%3
792
February1st to 10thNight
19%9%31%36%6%
720
11th to 20thNight
25%9%35%27%4
703
21st to endNight
20%11%35%30%4
592
March1st to 10thNight
18%8%33%35%6%
720
11th to 20thNight
17%9%34%29%10%1
720
21st to endNight
17%10%29%31%12%1
792
April1st to 10thNight
14%11%28%36%10%
720
11th to 20thNight
13%8%27%35%16%1
623
21st to endNight
13%5%24%36%20%2
540
May1st to 10thNight
11%6%23%38%19%2
540
11th to 20thNight
14%319%34%27%3
531
21st to endNight
15%112%29%37%6%
584
June1st to 10thNight
13%210%36%32%7%
540
11th to 20thNight
9%313%27%34%14%
540
21st to endNight
9%29%36%36%9%
540
July1st to 10thNight
12%26%27%42%12%
525
11th to 20thNight
10%16%22%48%13%
522
21st to endNight
8%27%27%47%10%
591
August1st to 10thNight
13%35%28%41%11%
537
11th to 20thNight
15%26%27%40%10%
534
21st to endNight
13%27%26%41%10%
642
September1st to 10thNight
10%29%28%40%10%
720
11th to 20thNight
18%110%28%37%7%
720
21st to endNight
15%313%35%31%4
720
October1st to 10thNight
15%417%29%30%6%
720
11th to 20thNight
13%423%36%20%4
720
21st to endNight
15%421%35%22%2
792
November1st to 10thNight
15%421%37%21%3
740
11th to 20thNight
17%8%27%33%13%2
760
21st to endNight
18%6%24%36%15%1
760
December1st to 10thNight
22%9%26%34%10%
760
11th to 20thNight
20%6%29%34%10%1
760
21st to endNight
25%10%24%32%8%
836
Page generated at 2024-01-10 10:16:10. Version ac07

Copyright 2024 Attilla Danko


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