Caballo Lake State Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Caballo Lake State Park clear sky chart from 2005-11-05 to 2017-10-06.

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
67%
15400
35%
47236
27%
15362
76%
15362
50%
22675

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 15thNight
64%
716
35%
2327
31%
716
74%
716
49%
1101
January16th to endNight
61%
768
39%
2496
32%
768
74%
768
51%
1139
February1st to 15thNight
65%
698
38%
2221
29%
697
78%
697
58%
965
February16th to endNight
53%
632
40%
1858
27%
632
67%
632
53%
905
March1st to 15thNight
58%
720
40%
1980
24%
720
71%
720
56%
955
March16th to endNight
58%
768
40%
2112
23%
768
71%
768
58%
994
April1st to 15thNight
52%
542
39%
1801
23%
542
72%
542
52%
759
April16th to endNight
54%
540
41%
1800
29%
540
75%
540
56%
726
May1st to 15thNight
57%
539
32%
1799
25%
539
70%
539
54%
760
May16th to endNight
64%
562
34%
1708
26%
561
73%
561
52%
802
June1st to 15thNight
73%
540
30%
1620
26%
540
77%
540
57%
719
June16th to endNight
77%
540
25%
1620
22%
540
79%
540
49%
814
July1st to 15thNight
78%
510
21%
1530
20%
510
78%
510
36%
879
July16th to endNight
75%
564
21%
1593
20%
531
74%
531
31%
972
August1st to 15thNight
81%
539
21%
1707
22%
536
81%
536
33%
986
August16th to endNight
81%
573
25%
1910
28%
573
82%
573
33%
1086
September1st to 15thNight
75%
540
25%
1800
29%
540
76%
540
33%
1022
September16th to endNight
77%
639
38%
1968
32%
639
82%
639
52%
943
October1st to 15thNight
74%
684
36%
2052
27%
684
79%
684
56%
951
October16th to endNight
78%
704
42%
2112
31%
704
85%
704
66%
900
November1st to 15thNight
76%
700
45%
2100
32%
700
85%
700
69%
882
November16th to endNight
65%
756
44%
2196
30%
756
75%
756
57%
1033
December1st to 15thNight
64%
858
37%
2430
27%
858
72%
858
53%
1207
December16th to endNight
61%
768
37%
2496
32%
768
71%
768
48%
1175

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
321232335%7%64%
47933
Night
3212323446%64%
47441
TransparencyDay
19%35%16%28%26%
47629
Night
19%36%16%28%26%
47246
SeeingDay
5%11%21%29%23%8%
5147
Night
4417%41%28%3
15412

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 15thDay
4212321346%65%
1611
16th to endDay
5%213212247%66%
1728
February1st to 15thDay
2212112235%74%
1633
16th to endDay
221222336%71%
1613
March1st to 15thDay
223214336%67%
1980
16th to endDay
222222345%71%
2112
April1st to 15thDay
3111212235%73%
2147
16th to endDay
111212235%78%
2160
May1st to 15thDay
211213336%71%
2151
16th to endDay
212323235%72%
2402
June1st to 15thDay
111221335%8%69%
2340
16th to endDay
31123245%7%8%60%
2340
July1st to 15thDay
6%3145%36%6%7%10%44%
2340
16th to endDay
5%325%6%38%6%9%11%38%
2467
August1st to 15thDay
6%214435%6%9%11%44%
2243
16th to endDay
5%213435%7%7%10%47%
2292
September1st to 15thDay
9%3146%3446%8%46%
2160
16th to endDay
5%112223245%68%
1987
October1st to 15thDay
412123246%69%
1705
16th to endDay
22121113477%
1760
November1st to 15thDay
22122235%75%
1759
16th to endDay
4312212235%70%
1745
December1st to 15thDay
4212213345%67%
1530
16th to endDay
3314212348%63%
1728
January1st to 15thNight
4312413245%65%
2327
16th to endNight
4212222336%67%
2496
February1st to 15thNight
211121225%6%71%
2219
16th to endNight
2312312325%69%
1858
March1st to 15thNight
2212213446%68%
1980
16th to endNight
221221223374%
2112
April1st to 15thNight
2212212346%71%
1801
16th to endNight
1121334475%
1800
May1st to 15thNight
312212336%71%
1799
16th to endNight
412313335%69%
1708
June1st to 15thNight
311221335%6%67%
1620
16th to endNight
213325%46%9%58%
1620
July1st to 15thNight
4224446%7%7%11%43%
1620
16th to endNight
5%226%5%47%6%7%13%37%
1701
August1st to 15thNight
42145%46%9%9%11%39%
1716
16th to endNight
6%2145%36%7%7%11%42%
1910
September1st to 15thNight
7%3145%36%5%8%8%46%
1800
16th to endNight
5%212222446%65%
1968
October1st to 15thNight
3211213246%68%
2052
16th to endNight
211221222477%
2112
November1st to 15thNight
12111123478%
2100
16th to endNight
4312211235%71%
2196
December1st to 15thNight
4212313237%66%
2430
16th to endNight
3313323346%63%
2496

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 15thDay
18%2418%37%17%
1612
16th to endDay
18%1318%39%18%
1728
February1st to 15thDay
14%2418%30%30%
1634
16th to endDay
14%2112%39%28%
1613
March1st to 15thDay
18%2211%34%30%
1980
16th to endDay
15%219%30%39%
2112
April1st to 15thDay
13%2210%33%37%
2147
16th to endDay
10%117%29%48%
2160
May1st to 15thDay
13%2311%26%42%
2151
16th to endDay
15%239%22%45%
2405
June1st to 15thDay
13%2210%21%48%
2340
16th to endDay
18%45%13%20%36%
2340
July1st to 15thDay
29%6%9%20%18%14%
2201
16th to endDay
34%7%16%25%12%3
2312
August1st to 15thDay
28%7%16%24%18%5%
2228
16th to endDay
27%7%14%22%18%10%
2292
September1st to 15thDay
32%6%8%20%20%11%
2160
16th to endDay
18%2317%32%24%
1987
October1st to 15thDay
17%16%12%30%31%
1705
16th to endDay
12%1117%34%31%
1760
November1st to 15thDay
12%1316%35%29%
1759
16th to endDay
18%1315%35%25%
1745
December1st to 15thDay
17%2422%38%13%
1530
16th to endDay
20%27%25%34%10%
1728
January1st to 15thNight
21%2418%36%16%
2327
16th to endNight
18%2316%39%18%
2496
February1st to 15thNight
14%2419%30%29%
2229
16th to endNight
18%2211%34%30%
1858
March1st to 15thNight
15%3315%31%29%
1980
16th to endNight
15%1211%32%37%
2112
April1st to 15thNight
15%2312%33%33%
1801
16th to endNight
12%2210%27%44%
1800
May1st to 15thNight
14%2310%25%42%
1800
16th to endNight
17%349%21%43%
1709
June1st to 15thNight
14%3412%18%46%
1620
16th to endNight
19%5%8%13%17%34%
1620
July1st to 15thNight
29%7%14%17%18%13%
1530
16th to endNight
35%6%18%25%12%2
1593
August1st to 15thNight
30%7%17%24%13%5%
1707
16th to endNight
29%8%14%23%16%7%
1910
September1st to 15thNight
32%5%14%18%16%12%
1800
16th to endNight
18%36%17%31%22%
1968
October1st to 15thNight
16%27%13%27%32%
2052
16th to endNight
12%1216%29%37%
2112
November1st to 15thNight
11%1217%35%32%
2100
16th to endNight
17%1214%34%29%
2196
December1st to 15thNight
19%2420%34%18%
2430
16th to endNight
20%37%23%35%10%
2496

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 15thDay
16%7%18%41%14%1
90
16th to endDay
5%11%25%32%19%6%
96
February1st to 15thDay
6%422%28%33%4
90
16th to endDay
5%23%26%22%16%5%
114
March1st to 15thDay
7%21%33%24%11%2
270
16th to endDay
7%27%29%23%8%3
288
April1st to 15thDay
7%29%33%21%7%
269
16th to endDay
7%29%32%20%8%1
270
May1st to 15thDay
421%40%24%8%1
288
16th to endDay
116%36%33%11%
330
June1st to 15thDay
28%30%31%21%5%
315
16th to endDay
2319%33%30%11%
315
July1st to 15thDay
5%9%34%39%11%
305
16th to endDay
41130%37%24%
327
August1st to 15thDay
36%29%40%19%
315
16th to endDay
6%428%42%17%
332
September1st to 15thDay
9%111%31%36%9%
315
16th to endDay
5%7%21%40%20%4
249
October1st to 15thDay
11%320%27%30%6%
107
16th to endDay
11%213%29%25%18%
96
November1st to 15thDay
7%8%24%23%25%10%
90
16th to endDay
10%18%22%26%21%1
90
December1st to 15thDay
48%26%31%25%3
90
16th to endDay
11%13%21%42%8%2
96
January1st to 15thNight
5%219%46%22%3
720
16th to endNight
5%5%22%43%19%2
768
February1st to 15thNight
35%22%45%22%1
704
16th to endNight
38%31%46%10%
632
March1st to 15thNight
37%25%45%16%1
720
16th to endNight
39%24%44%16%1
768
April1st to 15thNight
311%29%42%12%
542
16th to endNight
111%29%45%11%
540
May1st to 15thNight
27%29%46%13%
540
16th to endNight
45%20%51%17%
563
June1st to 15thNight
2215%52%26%1
540
16th to endNight
2210%42%39%3
540
July1st to 15thNight
5%430%50%7%
510
16th to endNight
5%1219%61%9%
564
August1st to 15thNight
4119%59%15%
539
16th to endNight
41224%58%8%
573
September1st to 15thNight
7%1330%51%5%
540
16th to endNight
5%18%39%40%3
639
October1st to 15thNight
4213%46%28%3
684
16th to endNight
2111%43%34%6%
704
November1st to 15thNight
217%43%31%4
700
16th to endNight
6%417%38%26%6%
756
December1st to 15thNight
6%418%46%21%2
858
16th to endNight
4421%50%15%3
768
Page generated at 2017-10-07 12:07:43. Version ac04

Copyright 2017 A. Danko


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