Eureka Springs Ranch
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Eureka Springs Ranch clear sky chart from 2005-11-06 to 2024-01-15.

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
69%
23852
34%
74326
29%
23799
76%
23799
48%
36574

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
63%
760
32%
2457
29%
756
71%
756
45%
1213
January11th to 20thNight
66%
736
35%
2392
34%
736
73%
736
48%
1148
January21st to endNight
58%
792
35%
2574
31%
792
68%
792
39%
1337
February1st to 10thNight
65%
720
35%
2340
33%
720
74%
720
49%
1118
February11th to 20thNight
55%
700
31%
2121
24%
700
66%
700
42%
1130
February21st to endNight
56%
592
38%
1655
28%
592
67%
592
48%
884
March1st to 10thNight
53%
720
36%
1980
23%
720
65%
720
48%
1033
March11th to 20thNight
64%
720
37%
1980
26%
720
74%
720
57%
988
March21st to endNight
65%
792
37%
2178
24%
792
75%
792
56%
1086
April1st to 10thNight
68%
716
36%
1976
25%
716
78%
716
61%
925
April11th to 20thNight
61%
533
40%
1777
31%
533
75%
533
55%
746
April21st to endNight
70%
540
45%
1800
39%
540
81%
540
69%
670
May1st to 10thNight
70%
540
41%
1637
31%
540
81%
540
64%
691
May11th to 20thNight
72%
531
38%
1594
32%
531
76%
531
62%
689
May21st to endNight
75%
582
42%
1746
35%
582
80%
582
76%
682
June1st to 10thNight
80%
540
35%
1620
29%
540
81%
540
61%
731
June11th to 20thNight
80%
540
37%
1620
31%
540
82%
540
74%
650
June21st to endNight
80%
540
27%
1620
24%
540
81%
540
51%
790
July1st to 10thNight
78%
525
20%
1575
18%
525
78%
525
39%
883
July11th to 20thNight
75%
522
16%
1566
14%
522
75%
522
27%
1010
July21st to endNight
71%
591
13%
1674
13%
558
71%
558
22%
1148
August1st to 10thNight
82%
537
20%
1602
19%
534
82%
534
38%
916
August11th to 20thNight
78%
534
25%
1628
25%
534
79%
534
33%
972
August21st to endNight
80%
594
28%
1980
31%
594
81%
594
37%
1068
September1st to 10thNight
75%
674
28%
1934
27%
674
76%
674
39%
1138
September11th to 20thNight
81%
720
38%
1980
32%
720
83%
720
56%
998
September21st to endNight
79%
720
38%
1980
27%
720
85%
720
60%
959
October1st to 10thNight
74%
720
37%
2092
28%
720
80%
720
55%
1014
October11th to 20thNight
78%
720
42%
2160
33%
720
84%
720
69%
894
October21st to endNight
79%
792
45%
2376
36%
792
86%
792
69%
990
November1st to 10thNight
75%
740
43%
2220
36%
740
80%
740
64%
965
November11th to 20thNight
74%
760
42%
2280
34%
760
82%
760
61%
1028
November21st to endNight
60%
760
36%
2463
31%
760
69%
760
45%
1222
December1st to 10thNight
64%
760
37%
2470
35%
760
70%
760
45%
1208
December11th to 20thNight
58%
760
31%
2941
30%
759
67%
759
31%
1598
December21st to endNight
59%
829
22%
4338
31%
817
65%
817
26%
2052

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
431342445%6%63%
74998
Night
431342445%6%64%
74815
TransparencyDay
21%5%7%12%28%28%
74725
Night
21%47%13%27%28%
74610
SeeingDay
5%11%26%33%20%5%
13677
Night
4317%41%30%5%
23865

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
6%424423447%59%
1708
11th to 20thDay
5%42441335%5%63%
1656
21st to endDay
6%6%23323336%63%
1782
February1st to 10thDay
5%424323346%65%
1620
11th to 20thDay
6%5%245%34445%57%
1723
21st to endDay
6%5%23324435%62%
1599
March1st to 10thDay
5%3244245%6%5%59%
1980
11th to 20thDay
4413334446%64%
1980
21st to endDay
3223323345%70%
2178
April1st to 10thDay
2112313447%71%
1983
11th to 20thDay
221232333476%
2131
21st to endDay
2112313346%75%
2160
May1st to 10thDay
2112323336%75%
2319
11th to 20thDay
2212223346%74%
2301
21st to endDay
211221222383%
2530
June1st to 10thDay
2212223347%73%
2340
11th to 20thDay
111111223483%
2340
21st to endDay
32234345%45%66%
2340
July1st to 10thDay
4324435%6%7%9%54%
2340
11th to 20thDay
5%4146%47%8%9%11%41%
2340
21st to endDay
8%426%7%5%7%8%9%11%34%
2545
August1st to 10thDay
5%4246%46%7%7%10%46%
2328
11th to 20thDay
5%4245%37%6%8%11%46%
2273
21st to endDay
43145%36%7%8%9%50%
2376
September1st to 10thDay
6%415%5%36%5%6%7%52%
2021
11th to 20thDay
331332345%6%67%
1980
21st to endDay
3213323446%68%
1980
October1st to 10thDay
3212324446%68%
1867
11th to 20thDay
21221233480%
1800
21st to endDay
1212213345%75%
1980
November1st to 10thDay
221222225%7%74%
1859
11th to 20thDay
231341434471%
1900
21st to endDay
5%424424446%62%
1714
December1st to 10thDay
6%4143245%5%6%60%
1710
11th to 20thDay
6%7%37%5%3345%8%49%
2169
21st to endDay
6%6%25%434445%56%
3146
January1st to 10thNight
6%5%2342445%7%59%
2457
11th to 20thNight
6%423323346%65%
2392
21st to endNight
7%6%23424346%59%
2574
February1st to 10thNight
3424323346%66%
2340
11th to 20thNight
6%6%24424445%60%
2120
21st to endNight
5%6%24423445%63%
1655
March1st to 10thNight
34233245%5%7%61%
1980
11th to 20thNight
5%412223345%68%
1980
21st to endNight
421332345%7%66%
2178
April1st to 10thNight
221231345%6%72%
1976
11th to 20thNight
221232334474%
1777
21st to endNight
111212235%80%
1800
May1st to 10thNight
222123335%76%
1637
11th to 20thNight
2212212346%74%
1594
21st to endNight
11211122385%
1746
June1st to 10thNight
3322312337%72%
1620
11th to 20thNight
111222212483%
1620
21st to endNight
32134345%46%65%
1620
July1st to 10thNight
4415%5%45%7%7%8%51%
1620
11th to 20thNight
45%25%7%47%7%9%14%37%
1620
21st to endNight
5%5%37%8%5%7%7%10%13%32%
1773
August1st to 10thNight
33146%35%8%6%11%50%
1611
11th to 20thNight
4326%6%46%6%8%10%46%
1628
21st to endNight
3215%5%35%5%8%11%50%
1980
September1st to 10thNight
6%5%245%345%6%8%52%
1934
11th to 20thNight
3213422445%69%
1980
21st to endNight
2213323346%71%
1980
October1st to 10thNight
2212424336%70%
2092
11th to 20thNight
3212112235%79%
2160
21st to endNight
211222233380%
2376
November1st to 10thNight
221232335%6%71%
2220
11th to 20thNight
2213323346%72%
2280
21st to endNight
5%413414446%62%
2463
December1st to 10thNight
7%41432335%6%61%
2470
11th to 20thNight
5%5%26%6%35%5%45%53%
3041
21st to endNight
7%7%24435%44455%
4521

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
25%46%12%35%18%
1709
11th to 20thDay
23%3413%34%23%
1656
21st to endDay
24%36%14%31%23%
1782
February1st to 10thDay
20%37%12%25%33%
1620
11th to 20thDay
28%47%12%24%26%
1733
21st to endDay
24%3413%27%28%
1599
March1st to 10thDay
25%35%9%33%25%
1980
11th to 20thDay
22%349%32%30%
1980
21st to endDay
18%3411%40%24%
2178
April1st to 10thDay
13%35%9%39%31%
1983
11th to 20thDay
13%248%31%42%
2134
21st to endDay
11%35%10%34%38%
2160
May1st to 10thDay
12%25%8%30%42%
2319
11th to 20thDay
13%36%10%29%39%
2304
21st to endDay
10%136%31%49%
2530
June1st to 10thDay
12%25%6%29%46%
2340
11th to 20thDay
8%24421%61%
2340
21st to endDay
19%47%10%21%39%
2340
July1st to 10thDay
24%8%12%16%16%24%
2276
11th to 20thDay
31%13%18%20%12%6%
2271
21st to endDay
37%13%20%17%9%3
2404
August1st to 10thDay
31%10%13%16%18%11%
2313
11th to 20thDay
29%10%16%17%19%9%
2273
21st to endDay
26%10%14%18%22%9%
2376
September1st to 10thDay
30%7%10%18%18%17%
2021
11th to 20thDay
18%5%7%14%29%27%
1980
21st to endDay
18%47%11%34%27%
1980
October1st to 10thDay
17%5%7%15%25%31%
1867
11th to 20thDay
11%349%34%41%
1800
21st to endDay
12%35%13%31%37%
1980
November1st to 10thDay
11%25%15%40%28%
1859
11th to 20thDay
17%3412%34%30%
1900
21st to endDay
23%4413%28%28%
1714
December1st to 10thDay
22%46%17%29%21%
1710
11th to 20thDay
32%37%18%24%15%
2168
21st to endDay
27%5%6%14%33%14%
3146
January1st to 10thNight
23%37%13%35%18%
2457
11th to 20thNight
21%35%13%33%25%
2392
21st to endNight
28%35%13%31%20%
2574
February1st to 10thNight
20%46%13%23%34%
2340
11th to 20thNight
26%45%13%26%26%
2121
21st to endNight
24%35%10%30%29%
1655
March1st to 10thNight
21%45%11%31%27%
1980
11th to 20thNight
18%35%12%31%32%
1980
21st to endNight
18%35%16%37%22%
2178
April1st to 10thNight
14%25%12%39%29%
1976
11th to 20thNight
15%249%29%40%
1777
21st to endNight
9%2312%36%39%
1800
May1st to 10thNight
12%25%9%30%43%
1637
11th to 20thNight
12%35%12%28%40%
1595
21st to endNight
8%127%32%51%
1746
June1st to 10thNight
15%245%25%50%
1620
11th to 20thNight
9%13419%64%
1620
21st to endNight
19%47%8%19%43%
1620
July1st to 10thNight
26%8%12%14%14%26%
1575
11th to 20thNight
35%12%17%22%8%7%
1566
21st to endNight
39%14%21%16%7%3
1674
August1st to 10thNight
25%10%16%19%15%15%
1602
11th to 20thNight
28%12%15%15%20%10%
1628
21st to endNight
25%9%14%21%22%9%
1980
September1st to 10thNight
29%7%10%17%19%18%
1934
11th to 20thNight
18%46%15%28%28%
1980
21st to endNight
16%36%14%33%28%
1980
October1st to 10thNight
17%46%15%25%33%
2092
11th to 20thNight
10%2413%28%43%
2160
21st to endNight
10%2413%30%41%
2376
November1st to 10thNight
13%25%12%37%31%
2220
11th to 20thNight
15%2416%28%34%
2280
21st to endNight
23%45%14%29%26%
2463
December1st to 10thNight
23%35%17%29%23%
2470
11th to 20thNight
31%47%15%26%17%
3041
21st to endNight
30%47%13%28%19%
4521

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
9%13%31%36%11%
270
11th to 20thDay
8%10%28%34%17%3
252
21st to endDay
5%12%30%37%16%1
264
February1st to 10thDay
411%26%37%19%4
240
11th to 20thDay
13%21%31%28%7%
388
21st to endDay
13%26%33%22%5%1
346
March1st to 10thDay
9%22%35%25%8%1
420
11th to 20thDay
10%21%29%25%13%2
420
21st to endDay
8%27%34%21%10%1
462
April1st to 10thDay
6%19%35%24%12%4
420
11th to 20thDay
5%23%37%24%8%3
412
21st to endDay
5%20%35%25%10%4
420
May1st to 10thDay
319%35%26%13%3
423
11th to 20thDay
412%35%32%14%4
448
21st to endDay
311%41%31%12%2
485
June1st to 10thDay
37%34%34%19%4
450
11th to 20thDay
28%31%34%22%4
450
21st to endDay
2428%42%18%4
450
July1st to 10thDay
414%46%30%6%
446
11th to 20thDay
5%8%39%35%12%
444
21st to endDay
6%19%29%38%16%
487
August1st to 10thDay
4211%34%35%14%
447
11th to 20thDay
438%38%35%12%
437
21st to endDay
228%33%40%15%
495
September1st to 10thDay
5%216%41%28%8%
450
11th to 20thDay
5%218%42%27%7%
450
21st to endDay
48%23%34%23%8%
450
October1st to 10thDay
47%25%34%26%5%
337
11th to 20thDay
47%25%36%23%5%
270
21st to endDay
5%6%22%34%26%7%
297
November1st to 10thDay
39%29%40%17%3
270
11th to 20thDay
46%25%39%24%2
270
21st to endDay
6%14%31%34%14%1
270
December1st to 10thDay
8%8%29%36%19%1
270
11th to 20thDay
412%37%32%14%
270
21st to endDay
8%18%30%31%11%1
297
January1st to 10thNight
7%421%45%22%2
760
11th to 20thNight
7%417%45%23%4
736
21st to endNight
9%5%22%41%20%2
792
February1st to 10thNight
4422%43%23%4
720
11th to 20thNight
7%5%27%43%16%1
704
21st to endNight
6%6%27%44%16%1
592
March1st to 10thNight
48%30%40%16%1
720
11th to 20thNight
6%5%22%37%25%4
720
21st to endNight
36%22%42%25%2
792
April1st to 10thNight
25%19%50%22%2
716
11th to 20thNight
28%25%45%19%2
533
21st to endNight
25%21%48%21%3
540
May1st to 10thNight
4420%46%24%2
540
11th to 20thNight
2318%50%23%4
531
21st to endNight
2318%50%25%2
584
June1st to 10thNight
3210%48%35%2
540
11th to 20thNight
1114%48%33%3
540
21st to endNight
2111%39%44%3
540
July1st to 10thNight
316%33%53%5%
525
11th to 20thNight
5%1426%56%7%
522
21st to endNight
5%5%21%56%13%
591
August1st to 10thNight
2322%58%14%
537
11th to 20thNight
31427%53%12%
534
21st to endNight
35%22%57%12%
594
September1st to 10thNight
7%17%31%45%8%
674
11th to 20thNight
319%37%43%8%
720
21st to endNight
2211%42%37%7%
720
October1st to 10thNight
3117%46%30%3
720
11th to 20thNight
3214%44%33%4
720
21st to endNight
2314%43%30%9%
792
November1st to 10thNight
2216%45%27%6%
740
11th to 20thNight
2219%42%33%3
760
21st to endNight
7%424%41%21%4
760
December1st to 10thNight
8%418%43%24%3
760
11th to 20thNight
7%5%22%43%20%3
760
21st to endNight
7%5%22%43%17%5%
836
Page generated at 2024-01-11 20:33:50. Version ac07

Copyright 2024 Attilla Danko


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