Cosmic Obsession - Kerrville
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Cosmic Obsession - Kerrville clear sky chart from 2005-11-05 to 2018-01-12.

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
47%
15921
27%
48403
17%
15877
57%
15877
36%
27237

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
35%
952
28%
2472
11%
951
46%
951
36%
1518
January16th to endNight
34%
807
33%
2343
13%
807
50%
807
35%
1327
February1st to 15thNight
36%
704
29%
2107
13%
698
49%
698
34%
1167
February16th to endNight
23%
632
30%
1894
8%
632
42%
632
34%
1043
March1st to 15thNight
32%
618
29%
2058
14%
618
48%
618
30%
1173
March16th to endNight
28%
576
26%
2112
15%
576
44%
576
29%
1150
April1st to 15thNight
24%
539
25%
1926
11%
539
43%
539
29%
1069
April16th to endNight
27%
540
26%
1778
14%
540
45%
540
29%
1026
May1st to 15thNight
28%
540
23%
1620
13%
540
43%
540
30%
983
May16th to endNight
40%
562
24%
1684
16%
561
53%
561
31%
1026
June1st to 15thNight
62%
540
21%
1620
18%
540
69%
540
51%
790
June16th to endNight
62%
540
22%
1620
22%
540
67%
540
39%
915
July1st to 15thNight
72%
510
21%
1530
20%
510
77%
510
41%
849
July16th to endNight
82%
564
26%
1594
30%
531
86%
531
47%
810
August1st to 15thNight
85%
539
28%
1784
35%
536
86%
536
50%
832
August16th to endNight
75%
573
21%
1913
25%
573
76%
573
32%
1131
September1st to 15thNight
75%
540
21%
1980
25%
540
77%
540
32%
1116
September16th to endNight
66%
537
23%
1980
25%
537
69%
537
27%
1179
October1st to 15thNight
64%
540
32%
1980
29%
540
70%
540
40%
961
October16th to endNight
56%
711
38%
2247
23%
711
67%
711
48%
1078
November1st to 15thNight
49%
867
27%
2387
14%
867
56%
867
40%
1366
November16th to endNight
47%
975
34%
2535
16%
975
56%
975
43%
1439
December1st to 15thNight
42%
975
30%
2535
15%
975
49%
975
35%
1574
December16th to endNight
35%
1040
26%
2704
11%
1040
44%
1040
33%
1715

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
10%5%2442445%7%48%
48921
Night
8%424323347%54%
48604
Cloud CoverDay
9%5%2443445%7%48%
48919
Night
7%424323347%55%
48604
TransparencyDay
35%5%9%19%19%9%
48619
Night
29%411%20%20%12%
48409
SeeingDay
12%5%22%33%21%4
5711
Night
10%7%30%35%14%1
15926

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
11%6%34323335%51%
1710
16th to endDay
10%5%13324335%56%
1890
February1st to 15thDay
9%5%24312345%56%
1750
16th to endDay
9%424223347%54%
1580
March1st to 15thDay
14%6%14313346%50%
1902
16th to endDay
12%5%2332235%6%51%
2112
April1st to 15thDay
11%5%35%413446%49%
2018
16th to endDay
10%6%25%423346%48%
2181
May1st to 15thDay
12%7%35%425%446%40%
2331
16th to endDay
14%6%35%5%245%5%6%40%
2430
June1st to 15thDay
33345%3445%8%52%
2340
16th to endDay
8%5%35%6%46%6%6%8%38%
2340
July1st to 15thDay
10%5%25%5%45%5%5%8%41%
2340
16th to endDay
6%324435%6%5%10%45%
2466
August1st to 15thDay
22144345%6%8%54%
2163
16th to endDay
10%4346%45%5%6%9%40%
2286
September1st to 15thDay
9%6%36%6%45%46%8%37%
1980
16th to endDay
11%7%26%6%35%45%6%40%
1980
October1st to 15thDay
9%5%14424437%51%
1980
16th to endDay
6%323312245%63%
1963
November1st to 15thDay
11%42443435%7%46%
1797
16th to endDay
9%5%2432323458%
1755
December1st to 15thDay
13%7%34412347%47%
1755
16th to endDay
11%7%35%412346%48%
1872
January1st to 15thNight
12%6%24322335%53%
2472
16th to endNight
11%423323346%54%
2343
February1st to 15thNight
8%42331343457%
2102
16th to endNight
7%425%32335%6%54%
1894
March1st to 15thNight
11%424424345%52%
2058
16th to endNight
8%434324345%54%
2112
April1st to 15thNight
6%5%25%4245%46%52%
1926
16th to endNight
6%5%25%5%34437%51%
1778
May1st to 15thNight
10%5%35%423446%49%
1619
16th to endNight
9%425%5%24348%49%
1683
June1st to 15thNight
221121345%9%64%
1620
16th to endNight
441343446%10%53%
1620
July1st to 15thNight
5%22333445%10%54%
1620
16th to endNight
431232346%10%57%
1702
August1st to 15thNight
12331435%10%63%
1794
16th to endNight
6%423435%6%5%10%46%
1913
September1st to 15thNight
7%42332346%10%49%
1980
16th to endNight
10%6%15%5%245%47%47%
1980
October1st to 15thNight
6%413312338%60%
1980
16th to endNight
5%312312335%66%
2247
November1st to 15thNight
8%5%23323336%57%
2387
16th to endNight
8%5%23213235%61%
2535
December1st to 15thNight
12%6%25%312346%51%
2535
16th to endNight
11%6%35%423335%50%
2704

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 15thDay
12%5%34413336%52%
1710
16th to endDay
10%423323335%56%
1890
February1st to 15thDay
9%5%24223245%56%
1750
16th to endDay
10%31332335%6%55%
1580
March1st to 15thDay
13%6%24313336%50%
1902
16th to endDay
11%5%23323346%52%
2110
April1st to 15thDay
10%5%35%324346%49%
2018
16th to endDay
10%5%25%433346%49%
2181
May1st to 15thDay
12%6%35%5%35%5%46%41%
2331
16th to endDay
12%7%35%5%3445%7%41%
2430
June1st to 15thDay
4225%335%46%9%53%
2340
16th to endDay
8%445%5%46%5%7%8%39%
2340
July1st to 15thDay
9%435%5%35%45%9%42%
2340
16th to endDay
6%324436%5%7%10%46%
2466
August1st to 15thDay
2224435%5%5%9%54%
2163
16th to endDay
9%5%245%45%5%6%9%40%
2286
September1st to 15thDay
9%6%36%6%45%46%8%38%
1980
16th to endDay
11%6%26%5%445%5%6%41%
1980
October1st to 15thDay
9%5%14324347%52%
1980
16th to endDay
6%313312335%64%
1963
November1st to 15thDay
10%6%1442445%7%48%
1797
16th to endDay
9%423323235%59%
1755
December1st to 15thDay
13%7%3341325%7%47%
1755
16th to endDay
11%7%35%312446%49%
1872
January1st to 15thNight
13%5%24212336%53%
2472
16th to endNight
11%5%13323345%55%
2343
February1st to 15thNight
8%424323335%57%
2102
16th to endNight
8%32432245%6%56%
1894
March1st to 15thNight
11%42442335%5%52%
2058
16th to endNight
8%424324345%54%
2112
April1st to 15thNight
6%434323446%53%
1926
16th to endNight
5%435%434436%53%
1778
May1st to 15thNight
9%435%423446%50%
1619
16th to endNight
8%434424449%49%
1683
June1st to 15thNight
211221345%9%65%
1620
16th to endNight
431341445%10%54%
1620
July1st to 15thNight
5%2144245%5%10%54%
1620
16th to endNight
321222346%11%58%
1702
August1st to 15thNight
11331345%10%63%
1794
16th to endNight
6%4145%35%5%5%10%47%
1913
September1st to 15thNight
7%42432346%10%49%
1980
16th to endNight
10%5%2443445%7%46%
1980
October1st to 15thNight
6%312312248%61%
1980
16th to endNight
5%312222335%66%
2247
November1st to 15thNight
7%5%14313346%58%
2387
16th to endNight
8%423212235%61%
2535
December1st to 15thNight
11%5%24312345%52%
2535
16th to endNight
10%6%34423346%50%
2704

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
35%3419%23%14%
1711
16th to endDay
31%36%14%26%17%
1890
February1st to 15thDay
31%26%15%22%20%
1751
16th to endDay
30%45%17%26%16%
1580
March1st to 15thDay
36%47%16%19%16%
1902
16th to endDay
35%48%18%21%12%
2112
April1st to 15thDay
36%38%14%19%16%
2018
16th to endDay
37%37%19%18%13%
2181
May1st to 15thDay
42%5%9%14%19%7%
2331
16th to endDay
44%5%9%17%18%3
2434
June1st to 15thDay
29%5%12%25%21%5%
2340
16th to endDay
41%7%11%19%15%3
2340
July1st to 15thDay
38%7%13%26%13%1
2201
16th to endDay
29%8%20%29%10%
2311
August1st to 15thDay
25%6%15%35%15%1
2149
16th to endDay
40%7%15%24%9%2
2286
September1st to 15thDay
43%6%9%20%16%3
1980
16th to endDay
42%5%10%17%16%8%
1980
October1st to 15thDay
32%6%10%20%21%9%
1980
16th to endDay
24%35%15%29%21%
1963
November1st to 15thDay
37%48%19%19%10%
1797
16th to endDay
30%3414%23%22%
1755
December1st to 15thDay
38%37%15%24%10%
1755
16th to endDay
38%27%17%23%11%
1872
January1st to 15thNight
34%25%16%21%18%
2472
16th to endNight
32%25%16%23%19%
2343
February1st to 15thNight
30%37%12%21%24%
2112
16th to endNight
29%37%16%25%17%
1894
March1st to 15thNight
34%38%14%20%18%
2058
16th to endNight
31%5%9%18%19%14%
2112
April1st to 15thNight
32%5%9%16%17%18%
1926
16th to endNight
34%411%18%18%13%
1778
May1st to 15thNight
35%5%11%20%16%10%
1620
16th to endNight
34%6%13%24%16%4
1685
June1st to 15thNight
17%6%16%28%26%4
1620
16th to endNight
27%6%16%27%17%4
1620
July1st to 15thNight
25%7%21%29%14%1
1530
16th to endNight
19%6%25%32%14%
1594
August1st to 15thNight
17%5%19%38%18%
1784
16th to endNight
31%8%21%25%11%2
1913
September1st to 15thNight
30%7%14%24%18%4
1980
16th to endNight
36%6%13%18%16%7%
1980
October1st to 15thNight
24%415%26%19%10%
1980
16th to endNight
20%37%17%28%23%
2247
November1st to 15thNight
29%38%24%21%12%
2387
16th to endNight
26%37%16%22%23%
2535
December1st to 15thNight
34%37%17%22%14%
2535
16th to endNight
36%46%15%22%14%
2704

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
17%15%39%19%7%
123
16th to endDay
14%10%44%26%4
96
February1st to 15thDay
10%14%34%28%11%1
90
16th to endDay
17%11%41%25%21
81
March1st to 15thDay
24%7%36%21%10%
90
16th to endDay
8%446%32%6%2
96
April1st to 15thDay
11%19%42%21%3
137
16th to endDay
15%14%42%20%6%
291
May1st to 15thDay
16%13%41%23%4
468
16th to endDay
21%6%31%30%9%
517
June1st to 15thDay
4220%48%22%2
495
16th to endDay
9%316%38%26%5%
495
July1st to 15thDay
8%211%40%32%5%
475
16th to endDay
5%6%37%40%9%
515
August1st to 15thDay
3339%40%12%
318
16th to endDay
13%5%36%31%12%
326
September1st to 15thDay
5%328%45%17%
135
16th to endDay
17%327%40%11%
135
October1st to 15thDay
48%39%37%10%
135
16th to endDay
10%423%38%19%3
144
November1st to 15thDay
28%423%28%14%
135
16th to endDay
17%12%25%22%14%6%
135
December1st to 15thDay
20%5%29%26%14%2
135
16th to endDay
20%14%33%27%4
144
January1st to 15thNight
16%9%35%30%7%
956
16th to endNight
13%9%39%31%7%
807
February1st to 15thNight
12%15%34%31%6%
704
16th to endNight
11%12%51%23%1
632
March1st to 15thNight
14%9%39%31%5%
618
16th to endNight
9%13%46%26%3
576
April1st to 15thNight
8%12%52%23%2
539
16th to endNight
9%12%49%24%4
540
May1st to 15thNight
10%13%46%25%4
540
16th to endNight
10%441%32%11%
563
June1st to 15thNight
331%51%13%
540
16th to endNight
5%225%45%21%1
540
July1st to 15thNight
4114%50%27%
510
16th to endNight
416%56%28%3
564
August1st to 15thNight
1449%41%2
539
16th to endNight
8%6%45%35%3
573
September1st to 15thNight
7%16%43%37%3
540
16th to endNight
12%111%41%30%2
537
October1st to 15thNight
9%220%37%28%2
540
16th to endNight
6%6%29%33%22%2
711
November1st to 15thNight
10%6%29%34%17%1
867
16th to endNight
11%7%30%35%14%1
975
December1st to 15thNight
16%8%30%35%8%
975
16th to endNight
15%10%33%32%6%
1040
Page generated at 2018-01-12 21:01:32. Version ac04

Copyright 2018 A. Danko


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