Pedernales Falls State Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Pedernales Falls State Park clear sky chart from 2005-11-05 to 2018-03-21.

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
50%
16200
27%
49198
18%
16154
58%
16154
36%
27741

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
37%
973
28%
2522
11%
970
46%
970
35%
1529
January16th to endNight
37%
959
31%
2623
13%
959
49%
959
35%
1566
February1st to 15thNight
33%
764
28%
2286
13%
758
46%
758
31%
1313
February16th to endNight
23%
684
27%
2050
8%
684
40%
684
29%
1215
March1st to 15thNight
32%
610
27%
2170
12%
610
49%
610
27%
1234
March16th to endNight
32%
594
25%
2178
15%
594
46%
594
28%
1184
April1st to 15thNight
31%
539
23%
1977
12%
539
47%
539
28%
1098
April16th to endNight
29%
540
25%
1755
13%
540
46%
540
27%
1067
May1st to 15thNight
33%
539
23%
1619
15%
539
44%
539
31%
960
May16th to endNight
48%
562
25%
1684
19%
561
59%
561
36%
977
June1st to 15thNight
67%
540
23%
1620
23%
540
73%
540
53%
788
June16th to endNight
67%
540
22%
1620
23%
540
73%
540
42%
894
July1st to 15thNight
77%
510
21%
1530
23%
510
81%
510
45%
812
July16th to endNight
81%
564
27%
1594
29%
531
85%
531
49%
808
August1st to 15thNight
89%
539
30%
1670
35%
536
90%
536
55%
769
August16th to endNight
77%
573
21%
1967
26%
573
78%
573
32%
1101
September1st to 15thNight
80%
540
22%
1980
27%
540
80%
540
34%
1082
September16th to endNight
70%
537
27%
1980
27%
537
74%
537
31%
1101
October1st to 15thNight
69%
546
33%
1986
31%
546
74%
546
41%
962
October16th to endNight
59%
768
37%
2304
23%
768
67%
768
49%
1136
November1st to 15thNight
52%
789
27%
2309
17%
789
58%
789
37%
1320
November16th to endNight
45%
975
32%
2535
14%
975
54%
975
42%
1451
December1st to 15thNight
42%
975
28%
2535
15%
975
48%
975
33%
1605
December16th to endNight
35%
1040
24%
2704
10%
1040
43%
1040
30%
1769

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%47%
49639
Night
9%423323447%53%
49401
Cloud CoverDay
10%5%2442445%7%47%
49637
Night
9%413323447%54%
49401
TransparencyDay
35%5%10%19%19%9%
49337
Night
30%412%20%20%12%
49206
SeeingDay
11%5%21%33%23%5%
5948
Night
11%6%27%36%15%1
16204

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
14%423323336%51%
1746
16th to endDay
13%423313346%52%
1963
February1st to 15thDay
13%6%24323336%52%
1900
16th to endDay
16%5%24213445%47%
1710
March1st to 15thDay
17%5%34422346%45%
2119
16th to endDay
12%5%245%22336%49%
2173
April1st to 15thDay
11%6%245%34436%46%
1971
16th to endDay
12%5%35%425%345%46%
2199
May1st to 15thDay
13%6%36%6%3445%6%38%
2331
16th to endDay
11%6%36%5%35%5%6%7%36%
2430
June1st to 15thDay
3215%437%6%6%9%49%
2340
16th to endDay
8%425%6%36%6%6%9%39%
2340
July1st to 15thDay
7%4246%36%6%7%8%41%
2340
16th to endDay
7%324435%5%6%10%46%
2466
August1st to 15thDay
111342436%10%60%
2277
16th to endDay
7%4247%46%6%7%9%39%
2234
September1st to 15thDay
8%5%25%6%36%45%7%42%
1980
16th to endDay
9%425%435%5%5%7%45%
1980
October1st to 15thDay
9%412325%45%6%52%
1962
16th to endDay
7%214212345%64%
1920
November1st to 15thDay
10%6%36%5%24346%46%
1876
16th to endDay
11%42331333458%
1755
December1st to 15thDay
15%6%24324346%46%
1755
16th to endDay
14%7%24434445%44%
1872
January1st to 15thNight
14%413313236%53%
2522
16th to endNight
14%313324346%52%
2623
February1st to 15thNight
12%6%34313225%54%
2282
16th to endNight
12%5%2432335%5%50%
2050
March1st to 15thNight
12%5%23323447%48%
2170
16th to endNight
9%5%2442435%6%52%
2178
April1st to 15thNight
8%425%42445%7%50%
1977
16th to endNight
12%5%24425%346%47%
1755
May1st to 15thNight
10%42442348%7%47%
1619
16th to endNight
6%4234245%5%9%50%
1683
June1st to 15thNight
211221445%9%64%
1620
16th to endNight
5%2123335%6%12%54%
1620
July1st to 15thNight
5%21221345%12%56%
1620
16th to endNight
421222345%13%57%
1702
August1st to 15thNight
11121346%9%67%
1680
16th to endNight
6%324425%5%5%11%48%
1967
September1st to 15thNight
7%3134245%6%9%50%
1980
16th to endNight
8%42443445%7%50%
1980
October1st to 15thNight
7%323213346%62%
1986
16th to endNight
6%312212245%66%
2304
November1st to 15thNight
8%424423346%54%
2309
16th to endNight
8%314323335%59%
2535
December1st to 15thNight
13%6%2332335%5%49%
2535
16th to endNight
14%7%24423335%47%
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
14%5%13323335%52%
1746
16th to endDay
13%423313336%53%
1963
February1st to 15thDay
13%6%14313336%51%
1900
16th to endDay
17%5%24214436%48%
1710
March1st to 15thDay
17%5%24422346%45%
2119
16th to endDay
12%5%24423336%49%
2171
April1st to 15thDay
12%5%25%424446%46%
1971
16th to endDay
12%6%25%425%445%46%
2199
May1st to 15thDay
14%6%26%5%345%5%6%39%
2331
16th to endDay
13%6%25%5%35%46%7%37%
2430
June1st to 15thDay
3215%337%6%6%9%49%
2340
16th to endDay
8%5%25%5%36%5%6%9%40%
2340
July1st to 15thDay
8%325%5%36%6%7%9%41%
2340
16th to endDay
7%324435%5%6%9%47%
2466
August1st to 15thDay
12342345%10%60%
2277
16th to endDay
7%415%7%36%6%7%9%39%
2234
September1st to 15thDay
8%6%26%5%36%5%5%7%43%
1980
16th to endDay
10%425%425%45%7%46%
1980
October1st to 15thDay
9%412334446%53%
1962
16th to endDay
7%213222335%65%
1920
November1st to 15thDay
11%6%35%5%14346%46%
1876
16th to endDay
11%5%1331243458%
1755
December1st to 15thDay
15%6%24324345%46%
1755
16th to endDay
13%8%24434436%44%
1872
January1st to 15thNight
14%413313236%53%
2522
16th to endNight
14%313323346%52%
2623
February1st to 15thNight
13%6%24313325%54%
2282
16th to endNight
12%5%24323346%51%
2050
March1st to 15thNight
13%5%14323348%49%
2170
16th to endNight
9%42432435%7%52%
2178
April1st to 15thNight
8%42442445%6%51%
1977
16th to endNight
13%424424437%48%
1755
May1st to 15thNight
10%4245%1347%8%47%
1619
16th to endNight
8%4134245%5%9%50%
1683
June1st to 15thNight
211221345%9%64%
1620
16th to endNight
5%2123245%6%11%55%
1620
July1st to 15thNight
5%21322345%11%56%
1620
16th to endNight
421222345%13%57%
1702
August1st to 15thNight
11121336%9%67%
1680
16th to endNight
6%324425%5%5%10%49%
1967
September1st to 15thNight
7%3134245%6%9%51%
1980
16th to endNight
8%42442445%7%50%
1980
October1st to 15thNight
7%312212346%62%
1986
16th to endNight
6%212212345%66%
2304
November1st to 15thNight
9%424423347%55%
2309
16th to endNight
9%313323345%59%
2535
December1st to 15thNight
13%6%14323445%49%
2535
16th to endNight
15%7%15%323335%47%
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%35%20%23%12%
1747
16th to endDay
33%26%14%27%16%
1963
February1st to 15thDay
36%36%15%21%16%
1901
16th to endDay
38%36%17%20%13%
1710
March1st to 15thDay
41%38%13%21%12%
2119
16th to endDay
36%39%17%21%10%
2173
April1st to 15thDay
38%49%15%19%13%
1971
16th to endDay
39%46%20%16%11%
2199
May1st to 15thDay
45%5%9%13%18%7%
2331
16th to endDay
44%6%11%18%16%3
2434
June1st to 15thDay
30%5%12%24%20%5%
2340
16th to endDay
39%6%13%21%15%3
2340
July1st to 15thDay
35%8%15%25%13%2
2201
16th to endDay
29%6%19%30%12%
2311
August1st to 15thDay
19%5%17%37%19%1
2263
16th to endDay
37%7%16%24%10%2
2234
September1st to 15thDay
39%5%10%22%15%5%
1980
16th to endDay
36%6%11%18%18%8%
1980
October1st to 15thDay
31%412%18%18%13%
1962
16th to endDay
22%35%16%30%22%
1920
November1st to 15thDay
40%48%18%17%10%
1876
16th to endDay
30%36%16%22%20%
1755
December1st to 15thDay
40%28%16%21%9%
1755
16th to endDay
41%49%15%18%10%
1872
January1st to 15thNight
33%26%17%21%17%
2522
16th to endNight
33%25%14%24%18%
2623
February1st to 15thNight
33%26%15%21%20%
2292
16th to endNight
35%47%15%20%16%
2050
March1st to 15thNight
36%310%13%21%14%
2170
16th to endNight
32%412%16%21%11%
2178
April1st to 15thNight
33%410%16%18%16%
1977
16th to endNight
38%49%17%18%11%
1755
May1st to 15thNight
33%6%12%21%17%9%
1620
16th to endNight
29%6%16%26%16%3
1685
June1st to 15thNight
16%5%16%28%27%5%
1620
16th to endNight
23%7%18%29%16%3
1620
July1st to 15thNight
20%8%23%31%15%1
1530
16th to endNight
18%7%26%34%12%
1594
August1st to 15thNight
13%6%21%39%18%1
1670
16th to endNight
29%8%20%26%11%3
1967
September1st to 15thNight
28%7%16%24%16%5%
1980
16th to endNight
32%5%14%21%17%8%
1980
October1st to 15thNight
23%414%25%19%12%
1986
16th to endNight
20%27%17%27%24%
2304
November1st to 15thNight
30%411%22%18%12%
2309
16th to endNight
27%28%16%22%21%
2535
December1st to 15thNight
37%38%17%21%11%
2535
16th to endNight
40%36%13%22%13%
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
14%11%40%24%8%
135
16th to endDay
15%13%34%27%8%
144
February1st to 15thDay
18%12%34%28%5%
135
16th to endDay
24%13%41%20%
120
March1st to 15thDay
17%11%45%17%7%
135
16th to endDay
5%10%41%35%7%
113
April1st to 15thDay
11%13%42%27%41
90
16th to endDay
14%14%39%23%8%
309
May1st to 15thDay
16%11%40%24%6%
468
16th to endDay
16%7%28%33%13%
517
June1st to 15thDay
3215%49%26%3
495
16th to endDay
8%211%42%28%6%
495
July1st to 15thDay
4110%41%35%6%
475
16th to endDay
5%433%46%9%
515
August1st to 15thDay
4234%45%12%
430
16th to endDay
11%6%37%27%16%
274
September1st to 15thDay
3422%48%20%
135
16th to endDay
12%224%48%12%
135
October1st to 15thDay
38%33%37%16%
135
16th to endDay
14%320%30%23%6%
144
November1st to 15thDay
24%322%36%9%3
135
16th to endDay
17%7%34%23%11%5%
135
December1st to 15thDay
22%229%26%11%6%
135
16th to endDay
25%14%30%25%4
144
January1st to 15thNight
16%10%31%32%8%
975
16th to endNight
15%8%34%33%7%
959
February1st to 15thNight
16%11%35%31%6%
764
16th to endNight
16%12%45%24%1
684
March1st to 15thNight
15%9%39%30%4
610
16th to endNight
11%10%43%29%3
594
April1st to 15thNight
11%6%48%31%2
539
16th to endNight
14%7%45%24%7%
540
May1st to 15thNight
11%9%41%30%6%
540
16th to endNight
8%435%36%14%
563
June1st to 15thNight
224%52%19%
540
16th to endNight
4120%51%19%2
540
July1st to 15thNight
5%10%52%26%3
510
16th to endNight
5%7%52%30%3
564
August1st to 15thNight
2351%37%5%
539
16th to endNight
7%1445%36%4
573
September1st to 15thNight
8%1442%38%5%
540
16th to endNight
10%9%37%38%3
537
October1st to 15thNight
8%215%41%27%4
546
16th to endNight
7%5%24%35%25%1
768
November1st to 15thNight
10%427%37%17%1
789
16th to endNight
10%6%33%34%13%1
975
December1st to 15thNight
17%7%28%35%9%
975
16th to endNight
19%8%30%32%7%
1040
Page generated at 2018-03-22 10:34:28. Version ac04

Copyright 2018 A. Danko


Pedernales Falls State Park Clear Sky Chart |Charts Home