Seclusion Ranch
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Seclusion Ranch clear sky chart from 2005-11-06 to 2024-02-15.

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
51%
24519
30%
79551
19%
24432
63%
24432
42%
40321

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
52%
941
34%
4310
18%
926
64%
926
33%
2053
January11th to 20thNight
46%
885
38%
4173
21%
869
59%
869
38%
1595
January21st to endNight
52%
825
24%
4206
24%
814
65%
814
32%
1808
February1st to 10thNight
45%
760
32%
2359
18%
760
61%
760
40%
1255
February11th to 20thNight
39%
718
31%
2152
16%
718
53%
718
40%
1163
February21st to endNight
38%
592
40%
1776
17%
592
60%
592
47%
886
March1st to 10thNight
41%
720
31%
2160
14%
720
56%
720
44%
1118
March11th to 20thNight
43%
720
28%
2062
13%
720
54%
720
43%
1114
March21st to endNight
37%
617
36%
2003
14%
617
61%
617
40%
1004
April1st to 10thNight
30%
540
32%
1800
14%
540
53%
540
43%
847
April11th to 20thNight
32%
533
26%
1777
15%
533
50%
533
35%
932
April21st to endNight
38%
540
25%
1800
16%
540
55%
540
35%
954
May1st to 10thNight
41%
540
27%
1693
16%
540
57%
540
35%
944
May11th to 20thNight
47%
531
19%
1593
14%
531
55%
531
33%
944
May21st to endNight
43%
583
23%
1556
12%
582
54%
582
43%
874
June1st to 10thNight
47%
540
25%
1440
13%
540
57%
540
45%
805
June11th to 20thNight
51%
540
28%
1440
16%
540
60%
540
51%
756
June21st to endNight
58%
540
23%
1440
16%
540
63%
540
41%
848
July1st to 10thNight
61%
525
21%
1400
16%
525
64%
525
34%
879
July11th to 20thNight
70%
522
26%
1392
21%
522
73%
522
44%
792
July21st to endNight
67%
591
18%
1553
17%
558
68%
558
31%
987
August1st to 10thNight
66%
537
15%
1727
15%
534
69%
534
31%
999
August11th to 20thNight
66%
534
23%
1778
24%
534
71%
534
32%
989
August21st to endNight
71%
594
27%
1980
30%
594
75%
594
41%
1009
September1st to 10thNight
64%
540
32%
1800
29%
540
73%
540
43%
893
September11th to 20thNight
60%
540
36%
1867
30%
540
72%
540
48%
850
September21st to endNight
60%
540
35%
1980
31%
540
70%
540
45%
888
October1st to 10thNight
52%
608
33%
2048
22%
608
64%
608
45%
974
October11th to 20thNight
61%
720
41%
2160
23%
720
74%
720
61%
955
October21st to endNight
57%
846
37%
2430
19%
846
68%
846
51%
1225
November1st to 10thNight
62%
925
38%
2405
19%
925
70%
925
62%
1185
November11th to 20thNight
56%
950
40%
2470
20%
950
67%
950
60%
1222
November21st to endNight
56%
950
35%
2470
20%
950
63%
950
50%
1337
December1st to 10thNight
51%
950
34%
2569
16%
950
63%
950
51%
1339
December11th to 20thNight
50%
948
32%
3084
19%
948
60%
948
42%
1557
December21st to endNight
43%
1034
22%
4698
16%
1026
58%
1026
29%
2341

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
442332446%8%59%
78456
Night
5%42442445%7%59%
80680
TransparencyDay
23%48%24%26%15%
78165
Night
25%39%24%26%13%
80494
SeeingDay
6%7%24%31%23%9%
14382
Night
7%5%32%41%15%1
24561

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
25%2432345%8%63%
2538
11th to 20thDay
2323326%5%7%7%62%
2668
21st to endDay
36%24335%5%46%59%
3146
February1st to 10thDay
35%35%42335%8%58%
1819
11th to 20thDay
24345%3445%6%61%
1789
21st to endDay
26%3433346%5%62%
1480
March1st to 10thDay
342433445%7%61%
1800
11th to 20thDay
5%5%2343445%8%58%
1895
21st to endDay
5%42442445%8%57%
2351
April1st to 10thDay
442242445%7%62%
2160
11th to 20thDay
6%6%1444445%7%55%
2131
21st to endDay
7%5%1443445%7%54%
2160
May1st to 10thDay
8%42342445%8%56%
2263
11th to 20thDay
8%5%243346%7%9%51%
2302
21st to endDay
5%312435%5%7%9%56%
2716
June1st to 10thDay
5%3133346%7%11%54%
2520
11th to 20thDay
5%2223245%7%8%60%
2520
21st to endDay
43134346%7%10%54%
2520
July1st to 10thDay
4313425%6%8%11%53%
2520
11th to 20thDay
22133346%8%13%56%
2520
21st to endDay
42135%46%7%10%10%47%
2670
August1st to 10thDay
33135%36%7%8%12%50%
2201
11th to 20thDay
43145%35%5%6%10%53%
2123
21st to endDay
32123245%7%9%61%
2376
September1st to 10thDay
6%2134245%6%9%60%
2160
11th to 20thDay
4212323448%65%
2092
21st to endDay
5%212423346%68%
1980
October1st to 10thDay
7%42232345%6%63%
1908
11th to 20thDay
221231334475%
1800
21st to endDay
6%42321323468%
1906
November1st to 10thDay
231211335%7%72%
1673
11th to 20thDay
2413322346%70%
1710
21st to endDay
5%5%24312346%65%
1710
December1st to 10thDay
25%34322348%64%
1609
11th to 20thDay
35%2332445%8%61%
1926
21st to endDay
37%36%5%34446%56%
2794
January1st to 10thNight
37%35%42445%7%57%
4417
11th to 20thNight
332332345%6%66%
4330
21st to endNight
35%24424447%60%
4521
February1st to 10thNight
37%35%423445%59%
2359
11th to 20thNight
46%35%43445%7%56%
2152
21st to endNight
46%2332245%464%
1776
March1st to 10thNight
5%5%24324447%60%
2160
11th to 20thNight
8%6%2332345%6%58%
2062
21st to endNight
5%5%133245%5%7%60%
2003
April1st to 10thNight
5%42342345%7%62%
1800
11th to 20thNight
7%6%2442445%6%55%
1777
21st to endNight
9%5%1442445%6%55%
1800
May1st to 10thNight
8%4144246%46%55%
1693
11th to 20thNight
12%5%14435%46%9%47%
1593
21st to endNight
8%31443445%6%58%
1556
June1st to 10thNight
5%3134345%6%9%55%
1440
11th to 20thNight
42133245%6%7%62%
1440
21st to endNight
4425%5%35%6%6%10%50%
1440
July1st to 10thNight
8%425%436%7%9%9%45%
1440
11th to 20thNight
5%2145%35%6%7%9%52%
1440
21st to endNight
7%425%6%36%6%9%11%41%
1644
August1st to 10thNight
6%3246%36%6%8%11%44%
1736
11th to 20thNight
6%3246%35%7%9%9%46%
1778
21st to endNight
4313435%6%8%9%54%
1980
September1st to 10thNight
5%32343346%8%57%
1800
11th to 20thNight
6%21222445%7%65%
1867
21st to endNight
5%313324345%66%
1980
October1st to 10thNight
8%413322346%65%
2048
11th to 20thNight
2312222335%76%
2160
21st to endNight
5%5%23323335%67%
2430
November1st to 10thNight
3212223347%71%
2405
11th to 20thNight
35%22312235%73%
2470
21st to endNight
5%6%24323346%63%
2470
December1st to 10thNight
25%3432246%7%63%
2569
11th to 20thNight
242442445%7%61%
3271
21st to endNight
36%36%5%34446%56%
4873

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
22%16%32%33%6%
2539
11th to 20thDay
21%18%31%31%8%
2668
21st to endDay
28%16%30%28%7%
3146
February1st to 10thDay
26%36%26%25%14%
1819
11th to 20thDay
25%36%24%29%12%
1799
21st to endDay
24%3320%28%22%
1480
March1st to 10thDay
22%37%23%25%20%
1800
11th to 20thDay
25%36%22%31%13%
1895
21st to endDay
26%46%26%26%13%
2351
April1st to 10thDay
22%46%22%27%18%
2160
11th to 20thDay
29%45%25%22%15%
2134
21st to endDay
29%37%24%27%10%
2160
May1st to 10thDay
28%5%9%22%26%10%
2263
11th to 20thDay
29%5%14%23%20%9%
2306
21st to endDay
24%5%13%22%22%15%
2716
June1st to 10thDay
24%411%25%22%13%
2520
11th to 20thDay
20%48%19%25%24%
2520
21st to endDay
24%5%8%21%25%17%
2520
July1st to 10thDay
25%6%12%19%23%15%
2451
11th to 20thDay
17%7%11%26%28%11%
2445
21st to endDay
28%8%17%29%16%3
2522
August1st to 10thDay
26%7%18%23%15%11%
2186
11th to 20thDay
26%6%9%23%23%12%
2123
21st to endDay
19%5%10%27%25%15%
2376
September1st to 10thDay
22%5%7%23%26%16%
2160
11th to 20thDay
19%39%19%25%26%
2092
21st to endDay
19%35%19%32%20%
1980
October1st to 10thDay
22%49%20%27%18%
1908
11th to 20thDay
13%25%18%32%29%
1800
21st to endDay
21%2323%30%21%
1906
November1st to 10thDay
13%25%23%32%25%
1673
11th to 20thDay
18%2426%35%15%
1710
21st to endDay
22%15%16%32%23%
1710
December1st to 10thDay
21%39%26%28%13%
1609
11th to 20thDay
21%5%5%24%31%14%
1924
21st to endDay
32%2423%23%16%
2794
January1st to 10thNight
29%1429%30%7%
4417
11th to 20thNight
21%19%30%28%11%
4330
21st to endNight
25%19%30%29%5%
4521
February1st to 10thNight
28%26%24%27%13%
2359
11th to 20thNight
28%37%26%24%12%
2152
21st to endNight
23%2320%35%17%
1776
March1st to 10thNight
25%3421%31%16%
2160
11th to 20thNight
26%37%23%29%11%
2062
21st to endNight
24%49%23%29%11%
2003
April1st to 10thNight
22%37%26%25%18%
1800
11th to 20thNight
29%310%24%20%14%
1777
21st to endNight
29%411%25%21%11%
1800
May1st to 10thNight
30%5%10%21%23%12%
1693
11th to 20thNight
35%414%20%16%10%
1594
21st to endNight
26%5%16%19%17%17%
1556
June1st to 10thNight
25%5%16%23%17%14%
1440
11th to 20thNight
20%5%10%19%23%23%
1440
21st to endNight
30%5%11%19%21%15%
1440
July1st to 10thNight
34%7%12%17%17%13%
1400
11th to 20thNight
26%6%12%28%21%8%
1392
21st to endNight
35%8%19%23%13%1
1553
August1st to 10thNight
31%8%21%19%11%9%
1727
11th to 20thNight
31%6%13%27%16%6%
1778
21st to endNight
23%7%11%27%22%10%
1980
September1st to 10thNight
24%412%23%24%13%
1800
11th to 20thNight
19%49%22%25%21%
1867
21st to endNight
21%36%19%32%18%
1980
October1st to 10thNight
22%310%20%27%18%
2048
11th to 20thNight
14%25%17%34%27%
2160
21st to endNight
22%25%21%30%20%
2430
November1st to 10thNight
15%35%24%30%23%
2405
11th to 20thNight
17%2425%36%17%
2470
21st to endNight
23%25%18%31%20%
2470
December1st to 10thNight
22%38%29%27%11%
2569
11th to 20thNight
23%35%19%37%12%
3272
21st to endNight
31%26%22%29%11%
4873

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
47%27%36%21%4
270
11th to 20thDay
7%9%29%37%14%4
270
21st to endDay
37%30%35%19%6%
297
February1st to 10thDay
311%37%34%12%2
270
11th to 20thDay
48%37%35%15%1
252
21st to endDay
5%9%43%34%10%
198
March1st to 10thDay
6%8%33%36%17%1
240
11th to 20thDay
9%13%30%28%14%5%
335
21st to endDay
12%21%33%24%9%2
462
April1st to 10thDay
7%15%36%29%10%2
420
11th to 20thDay
13%16%33%29%8%2
412
21st to endDay
11%16%36%23%11%2
420
May1st to 10thDay
10%12%29%33%15%2
526
11th to 20thDay
12%8%24%33%20%4
625
21st to endDay
6%8%30%30%21%5%
679
June1st to 10thDay
7%5%21%28%28%10%
630
11th to 20thDay
5%427%33%23%8%
630
21st to endDay
6%421%32%28%10%
630
July1st to 10thDay
5%213%29%38%13%
621
11th to 20thDay
219%31%40%17%
618
21st to endDay
317%25%37%26%
612
August1st to 10thDay
4213%30%30%21%
447
11th to 20thDay
4214%32%33%16%
437
21st to endDay
3112%35%35%14%
495
September1st to 10thDay
4318%30%32%13%
450
11th to 20thDay
5%120%32%29%13%
382
21st to endDay
8%317%26%30%16%
270
October1st to 10thDay
7%426%23%23%17%
270
11th to 20thDay
35%25%32%23%12%
270
21st to endDay
9%5%23%28%28%7%
297
November1st to 10thDay
46%27%31%26%6%
270
11th to 20thDay
6%425%31%27%5%
270
21st to endDay
10%7%25%31%20%6%
270
December1st to 10thDay
27%34%36%15%6%
270
11th to 20thDay
8%7%26%38%19%3
270
21st to endDay
5%8%43%32%9%3
297
January1st to 10thNight
45%34%41%14%2
950
11th to 20thNight
6%6%36%37%13%1
889
21st to endNight
6%433%45%12%1
836
February1st to 10thNight
7%5%36%43%8%
760
11th to 20thNight
7%8%40%36%9%
722
21st to endNight
8%8%42%37%5%
592
March1st to 10thNight
6%6%43%38%7%1
720
11th to 20thNight
10%9%35%38%8%1
720
21st to endNight
8%11%41%34%6%
617
April1st to 10thNight
7%9%52%29%4
540
11th to 20thNight
12%10%42%32%4
533
21st to endNight
12%9%38%33%8%
540
May1st to 10thNight
10%8%37%36%9%1
540
11th to 20thNight
14%5%30%35%14%1
531
21st to endNight
9%8%38%36%9%1
584
June1st to 10thNight
45%38%36%17%1
540
11th to 20thNight
5%437%45%9%
540
21st to endNight
5%228%46%19%
540
July1st to 10thNight
7%319%43%26%2
525
11th to 20thNight
4116%48%29%2
522
21st to endNight
8%113%38%38%2
591
August1st to 10thNight
7%214%38%37%3
537
11th to 20thNight
7%115%48%27%1
534
21st to endNight
4218%48%25%3
594
September1st to 10thNight
6%321%46%24%1
540
11th to 20thNight
6%227%40%22%2
540
21st to endNight
6%7%24%42%20%1
540
October1st to 10thNight
9%5%29%41%15%1
608
11th to 20thNight
4328%44%18%2
720
21st to endNight
7%428%39%19%3
846
November1st to 10thNight
4426%48%16%1
925
11th to 20thNight
47%29%44%14%1
950
21st to endNight
8%5%27%44%14%2
950
December1st to 10thNight
4336%44%11%1
950
11th to 20thNight
5%5%34%44%11%1
950
21st to endNight
6%8%37%40%9%1
1045
Page generated at 2024-02-12 04:35:37. Version ac07

Copyright 2024 Attilla Danko


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