Rooster Rock State Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Rooster Rock State Park clear sky chart from 2005-11-06 to 2024-02-20.

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
37%
22713
12%
80598
11%
22609
40%
22609
14%
59538

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
14%
756
4%
4405
3%
736
19%
736
4%
3837
January11th to 20thNight
18%
760
9%
4397
5%
740
25%
740
5%
3555
January21st to endNight
18%
835
7%
4649
6%
814
27%
814
5%
3896
February1st to 10thNight
21%
760
7%
2470
4%
760
24%
760
8%
2048
February11th to 20thNight
24%
738
9%
2396
6%
738
29%
738
9%
1927
February21st to endNight
21%
592
10%
1833
5%
592
28%
592
9%
1508
March1st to 10thNight
28%
720
10%
2102
7%
720
31%
720
12%
1693
March11th to 20thNight
26%
720
11%
1980
7%
720
30%
720
13%
1592
March21st to endNight
25%
792
4%
2112
3%
792
26%
792
8%
1839
April1st to 10thNight
27%
720
7%
1800
3%
720
28%
720
11%
1534
April11th to 20thNight
33%
711
9%
1779
4%
711
35%
711
15%
1430
April21st to endNight
35%
571
9%
1651
6%
571
36%
571
13%
1297
May1st to 10thNight
45%
372
13%
1452
15%
372
48%
372
16%
988
May11th to 20thNight
46%
354
11%
1416
14%
354
47%
354
12%
1017
May21st to endNight
43%
389
8%
1552
11%
388
45%
388
13%
1108
June1st to 10thNight
46%
360
7%
1440
9%
360
48%
360
15%
981
June11th to 20thNight
41%
360
7%
1440
11%
360
42%
360
13%
1022
June21st to endNight
61%
360
14%
1440
22%
360
64%
360
27%
781
July1st to 10thNight
72%
350
15%
1400
26%
350
73%
350
33%
693
July11th to 20thNight
72%
348
24%
1392
35%
348
76%
348
40%
627
July21st to endNight
82%
394
30%
1488
42%
372
87%
372
57%
545
August1st to 10thNight
75%
473
26%
1539
27%
471
77%
471
47%
725
August11th to 20thNight
80%
534
30%
1602
25%
534
81%
534
50%
784
August21st to endNight
68%
738
30%
1926
20%
738
69%
738
48%
1065
September1st to 10thNight
64%
720
27%
1800
14%
720
66%
720
49%
1019
September11th to 20thNight
57%
720
23%
1800
15%
720
58%
720
32%
1215
September21st to endNight
54%
720
20%
2051
16%
720
56%
720
29%
1321
October1st to 10thNight
48%
720
15%
2160
14%
720
51%
720
25%
1428
October11th to 20thNight
47%
720
18%
2160
19%
720
49%
720
21%
1506
October21st to endNight
32%
792
15%
2443
11%
792
38%
792
16%
1793
November1st to 10thNight
25%
740
11%
2481
9%
740
29%
740
10%
2011
November11th to 20thNight
19%
760
8%
2660
3%
760
26%
760
9%
2138
November21st to endNight
25%
760
8%
2660
5%
760
29%
760
11%
2027
December1st to 10thNight
20%
760
10%
2660
6%
760
26%
760
11%
2052
December11th to 20thNight
17%
760
7%
3213
4%
759
21%
759
6%
2583
December21st to endNight
14%
834
4%
4849
4%
817
17%
817
3%
3953

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
28%11%35%423345%32%
78320
Night
30%12%35%423335%30%
80893
TransparencyDay
56%411%16%10%3
78023
Night
58%410%15%9%3
80711
SeeingDay
32%9%22%25%10%2
13577
Night
36%6%15%26%15%2
22724

By Month

Percentage Cloud Cover SW (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
39%26%3442233310%
2539
11th to 20thDay
41%17%25%42323319%
2540
21st to endDay
46%13%35%43323314%
2995
February1st to 10thDay
37%15%345%34335%18%
1710
11th to 20thDay
34%19%45%6%2422319%
1657
21st to endDay
34%19%45%32333419%
1422
March1st to 10thDay
32%16%47%5%33446%17%
1857
11th to 20thDay
37%13%36%5%3334418%
1980
21st to endDay
38%17%47%6%3334412%
2243
April1st to 10thDay
35%18%46%5%3433416%
2160
11th to 20thDay
31%17%46%5%3333421%
2129
21st to endDay
31%12%46%424445%23%
2308
May1st to 10thDay
24%13%35%5%34335%32%
2506
11th to 20thDay
28%10%36%5%335%5%7%27%
2477
21st to endDay
35%8%35%43445%6%24%
2723
June1st to 10thDay
30%9%35%423446%28%
2520
11th to 20thDay
31%11%36%4345%5%6%23%
2520
21st to endDay
14%6%25%42345%6%48%
2520
July1st to 10thDay
13%5%2333345%6%55%
2520
11th to 20thDay
10%423323346%60%
2520
21st to endDay
9%31221324469%
2741
August1st to 10thDay
9%5%13423346%60%
2390
11th to 20thDay
7%423313245%66%
2298
21st to endDay
11%5%2442335%6%53%
2430
September1st to 10thDay
13%412223336%61%
2160
11th to 20thDay
18%7%34434446%44%
2160
21st to endDay
21%7%25%324446%42%
1906
October1st to 10thDay
26%8%25%4225%3439%
1800
11th to 20thDay
28%8%25%423346%34%
1800
21st to endDay
36%8%2432333331%
1912
November1st to 10thDay
39%12%47%5%33346%16%
1595
11th to 20thDay
41%9%35%434445%19%
1520
21st to endDay
35%13%36%5%2333324%
1520
December1st to 10thDay
33%13%36%42432327%
1520
11th to 20thDay
39%13%35%423445%18%
1928
21st to endDay
34%16%47%5%3443416%
2794
January1st to 10thNight
41%22%25%42433312%
4406
11th to 20thNight
41%17%34322335%18%
4420
21st to endNight
44%14%35%5%2333415%
4662
February1st to 10thNight
34%17%45%5%3434419%
2470
11th to 20thNight
35%17%3442333423%
2394
21st to endNight
34%20%35%423245%19%
1833
March1st to 10thNight
33%15%35%423435%23%
2102
11th to 20thNight
34%12%26%5%235%36%22%
1980
21st to endNight
36%19%36%424335%15%
2112
April1st to 10thNight
32%18%36%5%3333419%
1800
11th to 20thNight
29%15%345%24346%25%
1779
21st to endNight
33%14%3432434426%
1651
May1st to 10thNight
25%11%34424345%35%
1452
11th to 20thNight
26%9%45%5%25%5%46%29%
1416
21st to endNight
28%8%35%5%25%45%7%29%
1552
June1st to 10thNight
27%8%35%42435%5%35%
1440
11th to 20thNight
27%11%45%5%24445%31%
1440
21st to endNight
13%7%33324435%53%
1440
July1st to 10thNight
10%5%1332433462%
1440
11th to 20thNight
8%313323346%65%
1440
21st to endNight
421221323476%
1576
August1st to 10thNight
7%423322237%66%
1547
11th to 20thNight
6%313332336%68%
1602
21st to endNight
10%413222236%63%
1926
September1st to 10thNight
12%312322345%64%
1800
11th to 20thNight
18%6%245%33345%47%
1800
21st to endNight
19%8%24423445%46%
2051
October1st to 10thNight
25%8%24323335%44%
2160
11th to 20thNight
26%8%343235%35%36%
2160
21st to endNight
33%9%25%32333434%
2443
November1st to 10thNight
40%12%35%42334420%
2481
11th to 20thNight
42%11%35%42333421%
2660
21st to endNight
34%12%3443433427%
2660
December1st to 10thNight
35%12%25%423235%26%
2660
11th to 20thNight
36%15%36%433345%19%
3276
21st to endNight
34%17%47%6%3433316%
4862

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
82%37%6%21
2539
11th to 20thDay
73%37%10%43
2540
21st to endDay
76%45%9%5%1
2995
February1st to 10thDay
69%5%11%9%5%
1710
11th to 20thDay
72%48%11%41
1666
21st to endDay
71%49%7%7%2
1422
March1st to 10thDay
70%410%11%41
1857
11th to 20thDay
71%37%13%5%1
1980
21st to endDay
76%6%9%8%1
2243
April1st to 10thDay
73%311%9%3
2160
11th to 20thDay
69%48%10%7%2
2132
21st to endDay
65%5%11%10%7%2
2308
May1st to 10thDay
56%413%18%9%
2506
11th to 20thDay
57%6%14%17%5%1
2480
21st to endDay
61%6%14%16%3
2724
June1st to 10thDay
58%5%15%17%5%
2520
11th to 20thDay
62%6%16%12%41
2520
21st to endDay
37%5%16%27%10%5%
2520
July1st to 10thDay
30%6%14%25%19%6%
2451
11th to 20thDay
26%5%10%25%28%6%
2445
21st to endDay
19%38%29%35%6%
2589
August1st to 10thDay
26%5%13%32%19%6%
2373
11th to 20thDay
22%314%32%20%9%
2298
21st to endDay
31%5%10%29%21%4
2430
September1st to 10thDay
27%311%26%20%13%
2160
11th to 20thDay
42%5%11%18%16%9%
2160
21st to endDay
44%412%17%16%7%
1906
October1st to 10thDay
49%5%8%19%15%4
1800
11th to 20thDay
52%412%15%14%3
1800
21st to endDay
59%47%14%15%1
1912
November1st to 10thDay
71%39%12%41
1595
11th to 20thDay
69%410%9%6%1
1520
21st to endDay
66%5%6%9%13%1
1520
December1st to 10thDay
64%5%8%12%8%2
1520
11th to 20thDay
69%413%11%4
1928
21st to endDay
73%410%10%2
2794
January1st to 10thNight
79%48%5%31
4406
11th to 20thNight
72%47%12%32
4420
21st to endNight
75%37%9%5%1
4662
February1st to 10thNight
70%5%9%10%6%1
2470
11th to 20thNight
66%5%10%11%6%2
2396
21st to endNight
70%38%10%7%1
1833
March1st to 10thNight
66%49%16%41
2102
11th to 20thNight
65%410%14%5%1
1980
21st to endNight
74%5%10%8%2
2112
April1st to 10thNight
71%411%11%4
1800
11th to 20thNight
61%7%12%10%7%3
1779
21st to endNight
63%412%12%6%2
1651
May1st to 10thNight
52%5%13%20%9%1
1452
11th to 20thNight
55%7%14%16%5%3
1416
21st to endNight
56%6%16%18%4
1552
June1st to 10thNight
53%417%20%6%
1440
11th to 20thNight
57%417%17%4
1440
21st to endNight
35%418%28%10%6%
1440
July1st to 10thNight
27%6%11%29%21%6%
1400
11th to 20thNight
22%411%26%30%7%
1392
21st to endNight
13%39%34%32%10%
1488
August1st to 10thNight
22%314%35%20%6%
1539
11th to 20thNight
20%414%34%18%10%
1602
21st to endNight
24%412%34%20%6%
1926
September1st to 10thNight
24%413%28%20%11%
1800
11th to 20thNight
41%5%10%20%12%12%
1800
21st to endNight
40%5%14%16%16%9%
2051
October1st to 10thNight
46%39%19%18%5%
2160
11th to 20thNight
50%410%15%17%4
2160
21st to endNight
56%5%7%13%16%3
2443
November1st to 10thNight
69%47%13%7%1
2481
11th to 20thNight
69%39%10%8%1
2660
21st to endNight
62%47%12%13%2
2660
December1st to 10thNight
63%5%10%12%9%1
2660
11th to 20thNight
68%5%11%10%6%
3276
21st to endNight
74%411%8%3
4862

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
57%7%19%14%3
180
11th to 20thDay
49%11%24%11%4
180
21st to endDay
50%10%17%17%6%
321
February1st to 10thDay
47%11%18%18%5%1
370
11th to 20thDay
47%10%24%16%21
363
21st to endDay
48%12%21%17%3
320
March1st to 10thDay
44%14%25%11%6%
420
11th to 20thDay
41%12%21%20%5%1
420
21st to endDay
48%11%19%18%4
462
April1st to 10thDay
48%10%16%18%6%1
420
11th to 20thDay
43%13%22%14%6%2
412
21st to endDay
36%13%24%17%8%1
420
May1st to 10thDay
27%13%26%22%9%2
423
11th to 20thDay
39%8%19%20%10%3
448
21st to endDay
33%9%19%25%11%3
485
June1st to 10thDay
30%8%18%25%14%4
450
11th to 20thDay
32%10%26%22%8%1
450
21st to endDay
14%6%28%32%17%4
450
July1st to 10thDay
13%6%22%42%14%2
446
11th to 20thDay
9%8%23%41%16%4
444
21st to endDay
6%322%41%21%7%
487
August1st to 10thDay
10%417%47%14%8%
447
11th to 20thDay
7%422%40%22%6%
437
21st to endDay
10%8%28%34%15%4
495
September1st to 10thDay
16%429%32%15%4
450
11th to 20thDay
21%7%23%31%16%2
450
21st to endDay
24%7%25%32%10%2
450
October1st to 10thDay
28%8%22%24%15%3
450
11th to 20thDay
35%5%20%27%12%2
450
21st to endDay
42%8%19%19%10%2
427
November1st to 10thDay
47%11%16%20%6%1
232
11th to 20thDay
41%11%26%16%42
180
21st to endDay
47%8%19%21%4
180
December1st to 10thDay
46%12%19%17%32
180
11th to 20thDay
59%9%17%14%1
180
21st to endDay
54%9%21%10%6%1
198
January1st to 10thNight
51%11%19%14%41
760
11th to 20thNight
48%8%20%18%6%
760
21st to endNight
45%7%23%18%6%1
836
February1st to 10thNight
45%7%19%22%6%1
760
11th to 20thNight
46%9%14%23%8%
742
21st to endNight
47%11%14%22%5%
592
March1st to 10thNight
42%8%16%23%11%1
720
11th to 20thNight
41%6%19%24%9%
720
21st to endNight
47%8%11%22%10%1
792
April1st to 10thNight
43%7%13%24%11%1
720
11th to 20thNight
37%7%15%24%14%2
711
21st to endNight
41%6%11%27%13%1
571
May1st to 10thNight
30%5%14%29%19%2
372
11th to 20thNight
29%6%8%29%25%3
354
21st to endNight
31%412%27%24%2
389
June1st to 10thNight
29%412%32%20%3
360
11th to 20thNight
30%8%13%32%17%
360
21st to endNight
16%411%41%27%1
360
July1st to 10thNight
11%27%40%39%1
350
11th to 20thNight
9%111%47%29%2
348
21st to endNight
429%43%39%3
394
August1st to 10thNight
10%37%34%41%5%
473
11th to 20thNight
7%27%35%39%10%
534
21st to endNight
12%312%40%28%5%
738
September1st to 10thNight
14%315%34%30%4
720
11th to 20thNight
19%411%31%30%5%
720
21st to endNight
23%413%33%23%4
720
October1st to 10thNight
27%5%13%30%21%3
720
11th to 20thNight
31%5%11%31%20%3
720
21st to endNight
40%5%18%24%11%3
792
November1st to 10thNight
47%6%15%24%7%1
740
11th to 20thNight
50%6%20%19%4
760
21st to endNight
41%8%22%25%4
760
December1st to 10thNight
42%10%24%19%5%1
760
11th to 20thNight
51%8%18%19%4
760
21st to endNight
55%9%17%15%4
836
Page generated at 2024-02-17 03:28:36. Version ac07

Copyright 2024 Attilla Danko


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