Caddo Lake State Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Caddo Lake State Park clear sky chart from 2005-11-06 to 2024-01-13.

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%
23944
25%
74198
18%
23884
55%
23884
31%
43320

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
28%
950
27%
2458
9%
946
41%
946
29%
1579
January11th to 20thNight
27%
915
25%
2379
7%
915
38%
915
27%
1573
January21st to endNight
28%
990
28%
2574
9%
990
38%
990
29%
1670
February1st to 10thNight
25%
900
22%
2340
7%
900
34%
900
28%
1522
February11th to 20thNight
21%
759
20%
2154
8%
755
29%
755
24%
1416
February21st to endNight
21%
444
26%
1628
10%
444
37%
444
19%
1011
March1st to 10thNight
30%
540
25%
1980
13%
540
44%
540
22%
1178
March11th to 20thNight
29%
540
23%
1980
13%
540
42%
540
21%
1194
March21st to endNight
30%
594
25%
2178
15%
594
44%
594
26%
1258
April1st to 10thNight
31%
540
25%
1913
16%
540
48%
540
29%
1062
April11th to 20thNight
33%
533
25%
1775
17%
533
48%
533
27%
1041
April21st to endNight
35%
540
27%
1800
16%
540
53%
540
31%
1009
May1st to 10thNight
39%
540
22%
1759
15%
540
53%
540
30%
1034
May11th to 20thNight
47%
531
24%
1593
20%
531
55%
531
34%
931
May21st to endNight
53%
584
25%
1746
20%
582
62%
582
34%
1023
June1st to 10thNight
75%
540
21%
1620
22%
540
78%
540
40%
891
June11th to 20thNight
70%
540
22%
1620
25%
540
72%
540
44%
857
June21st to endNight
72%
540
25%
1620
27%
540
76%
540
42%
875
July1st to 10thNight
74%
525
19%
1575
21%
525
76%
525
34%
947
July11th to 20thNight
84%
522
25%
1566
30%
522
85%
522
50%
796
July21st to endNight
79%
591
22%
1673
26%
558
82%
558
42%
904
August1st to 10thNight
85%
537
29%
1601
32%
534
86%
534
53%
791
August11th to 20thNight
79%
534
26%
1704
31%
534
80%
534
38%
937
August21st to endNight
75%
594
22%
1980
26%
594
76%
594
32%
1149
September1st to 10thNight
73%
540
24%
1805
27%
540
75%
540
35%
1002
September11th to 20thNight
70%
540
25%
1980
29%
540
72%
540
31%
1119
September21st to endNight
72%
540
33%
1980
34%
540
75%
540
40%
958
October1st to 10thNight
72%
715
33%
2155
26%
715
75%
715
47%
1096
October11th to 20thNight
52%
720
35%
2160
20%
720
63%
720
39%
1185
October21st to endNight
45%
792
32%
2376
20%
792
55%
792
36%
1347
November1st to 10thNight
51%
740
31%
2220
21%
740
59%
740
39%
1216
November11th to 20thNight
44%
760
30%
2280
19%
760
53%
760
34%
1309
November21st to endNight
35%
836
29%
2356
15%
836
46%
836
28%
1483
December1st to 10thNight
32%
950
27%
2470
11%
950
43%
950
29%
1611
December11th to 20thNight
32%
948
26%
2875
11%
948
40%
948
24%
1824
December21st to endNight
28%
1040
16%
4325
10%
1026
38%
1026
18%
2522

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
13%6%25%5%35%5%5%7%45%
75001
Night
12%5%2442445%7%51%
74772
TransparencyDay
39%6%10%20%19%6%
74725
Night
34%5%10%21%22%9%
74568
SeeingDay
14%9%22%27%21%7%
14013
Night
15%8%25%31%18%3
23951

By Month

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 10thDay
17%9%35%423235%48%
1707
11th to 20thDay
18%8%25%42424447%
1643
21st to endDay
19%7%2442333449%
1782
February1st to 10thDay
22%8%35%5%34235%40%
1620
11th to 20thDay
21%8%45%5%33345%40%
1707
21st to endDay
25%7%34433335%41%
1628
March1st to 10thDay
19%7%35%5%34446%40%
1980
11th to 20thDay
19%6%35%6%34446%40%
1980
21st to endDay
16%8%36%5%2435%6%42%
2178
April1st to 10thDay
13%7%345%35%347%45%
2047
11th to 20thDay
16%5%36%5%2445%7%43%
2134
21st to endDay
13%5%26%5%35%45%7%44%
2160
May1st to 10thDay
13%7%36%435%5%47%43%
2197
11th to 20thDay
12%5%26%6%5%5%6%6%7%40%
2302
21st to endDay
11%5%36%7%46%6%6%10%37%
2531
June1st to 10thDay
7%425%6%46%8%8%9%42%
2340
11th to 20thDay
5%425%6%5%7%6%7%10%43%
2340
21st to endDay
6%3246%47%7%7%9%45%
2340
July1st to 10thDay
9%436%8%47%7%8%11%33%
2340
11th to 20thDay
5%425%447%7%8%10%45%
2340
21st to endDay
6%425%6%47%6%8%10%41%
2546
August1st to 10thDay
43145%5%6%7%7%10%48%
2328
11th to 20thDay
7%425%446%6%8%10%44%
2194
21st to endDay
10%326%7%46%7%7%10%38%
2376
September1st to 10thDay
9%425%5%36%5%6%8%47%
2150
11th to 20thDay
12%426%5%45%5%5%8%43%
1980
21st to endDay
7%4134335%5%7%57%
1967
October1st to 10thDay
7%2144345%47%60%
1800
11th to 20thDay
15%5%24313446%54%
1800
21st to endDay
18%5%2432333454%
1980
November1st to 10thDay
12%5%24424446%52%
1858
11th to 20thDay
11%6%35%42335%5%53%
1900
21st to endDay
19%7%35%42333446%
1820
December1st to 10thDay
16%8%45%324345%47%
1710
11th to 20thDay
16%9%345%34445%44%
2161
21st to endDay
16%9%25%5%34445%43%
3135
January1st to 10thNight
17%7%3432334450%
2458
11th to 20thNight
20%6%24433335%48%
2379
21st to endNight
19%6%2433334449%
2574
February1st to 10thNight
18%7%24423345%48%
2340
11th to 20thNight
22%7%245%23335%45%
2153
21st to endNight
21%6%25%432335%45%
1628
March1st to 10thNight
17%6%24434346%45%
1980
11th to 20thNight
15%6%35%5%2445%6%45%
1980
21st to endNight
14%5%2443345%6%49%
2178
April1st to 10thNight
9%4245%245%6%8%50%
1913
11th to 20thNight
12%6%245%25%45%7%48%
1775
21st to endNight
11%5%15%424448%51%
1800
May1st to 10thNight
10%435%435%5%5%9%48%
1759
11th to 20thNight
11%425%4335%48%50%
1593
21st to endNight
9%425%5%35%5%6%9%48%
1745
June1st to 10thNight
4225%425%46%10%55%
1620
11th to 20thNight
332442445%9%60%
1620
21st to endNight
6%3234345%6%8%57%
1620
July1st to 10thNight
7%3245%45%5%7%13%45%
1620
11th to 20thNight
3234235%7%12%59%
1620
21st to endNight
43244346%7%12%53%
1772
August1st to 10thNight
421233345%11%63%
1611
11th to 20thNight
4413435%6%7%12%50%
1704
21st to endNight
6%3246%45%7%6%10%47%
1980
September1st to 10thNight
7%425%4345%6%7%53%
1805
11th to 20thNight
10%5%235%345%5%7%51%
1980
21st to endNight
7%31342335%7%61%
1980
October1st to 10thNight
6%313424446%64%
2155
11th to 20thNight
12%424413336%59%
2160
21st to endNight
16%41432333457%
2376
November1st to 10thNight
11%5%13333336%59%
2220
11th to 20thNight
10%425%43435%5%55%
2280
21st to endNight
15%6%35%424345%49%
2356
December1st to 10thNight
16%6%345%2345%6%46%
2470
11th to 20thNight
14%7%245%3444448%
3036
21st to endNight
17%7%245%23335%48%
4532

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
42%36%19%24%7%
1708
11th to 20thDay
43%3421%22%7%
1643
21st to endDay
41%2417%25%10%
1782
February1st to 10thDay
49%26%15%17%9%
1620
11th to 20thDay
49%45%16%19%7%
1716
21st to endDay
48%46%11%22%10%
1628
March1st to 10thDay
47%47%15%18%10%
1980
11th to 20thDay
46%47%17%19%7%
1980
21st to endDay
44%47%18%23%4
2178
April1st to 10thDay
41%48%22%18%8%
2047
11th to 20thDay
43%5%7%18%19%7%
2134
21st to endDay
39%5%9%20%23%4
2160
May1st to 10thDay
41%5%9%22%17%6%
2197
11th to 20thDay
41%7%12%23%15%2
2306
21st to endDay
42%8%13%22%14%1
2531
June1st to 10thDay
36%10%13%26%14%1
2340
11th to 20thDay
33%8%15%25%16%3
2340
21st to endDay
32%9%14%25%18%3
2340
July1st to 10thDay
41%9%18%22%8%1
2276
11th to 20thDay
29%10%19%27%15%1
2271
21st to endDay
34%9%18%27%12%
2405
August1st to 10thDay
28%9%16%32%14%1
2314
11th to 20thDay
33%9%15%24%16%2
2194
21st to endDay
38%10%14%23%13%2
2376
September1st to 10thDay
34%6%13%20%18%9%
2150
11th to 20thDay
39%7%12%16%19%7%
1980
21st to endDay
27%6%10%22%25%11%
1967
October1st to 10thDay
25%411%22%24%13%
1800
11th to 20thDay
33%46%18%26%14%
1800
21st to endDay
36%25%17%26%12%
1980
November1st to 10thDay
34%5%8%20%24%10%
1858
11th to 20thDay
34%46%18%27%10%
1900
21st to endDay
44%35%16%25%8%
1820
December1st to 10thDay
41%49%19%20%8%
1710
11th to 20thDay
43%35%14%26%8%
2159
21st to endDay
44%27%15%25%6%
3135
January1st to 10thNight
39%36%16%26%10%
2458
11th to 20thNight
42%38%17%22%8%
2379
21st to endNight
40%35%14%27%12%
2574
February1st to 10thNight
40%47%19%19%12%
2340
11th to 20thNight
44%36%17%22%8%
2154
21st to endNight
44%37%13%18%14%
1628
March1st to 10thNight
41%47%15%21%12%
1980
11th to 20thNight
40%5%8%17%22%8%
1980
21st to endNight
37%49%19%25%6%
2178
April1st to 10thNight
32%5%11%23%18%11%
1913
11th to 20thNight
35%5%9%19%19%12%
1775
21st to endNight
32%5%9%24%26%5%
1800
May1st to 10thNight
34%6%11%22%18%10%
1759
11th to 20thNight
33%413%27%18%4
1594
21st to endNight
32%6%14%26%19%1
1746
June1st to 10thNight
24%9%15%30%20%2
1620
11th to 20thNight
23%7%16%29%22%4
1620
21st to endNight
24%6%14%26%25%4
1620
July1st to 10thNight
29%10%20%27%13%1
1575
11th to 20thNight
17%8%22%32%19%2
1566
21st to endNight
22%9%23%30%15%1
1673
August1st to 10thNight
17%6%20%35%20%2
1601
11th to 20thNight
27%7%17%28%17%5%
1704
21st to endNight
31%8%16%24%17%3
1980
September1st to 10thNight
29%6%14%21%20%10%
1805
11th to 20thNight
33%6%11%20%20%10%
1980
21st to endNight
24%5%10%21%27%13%
1980
October1st to 10thNight
22%5%8%26%24%16%
2155
11th to 20thNight
29%36%15%28%19%
2160
21st to endNight
32%36%16%26%17%
2376
November1st to 10thNight
29%48%18%29%13%
2220
11th to 20thNight
32%46%18%27%14%
2280
21st to endNight
39%36%18%24%10%
2356
December1st to 10thNight
40%49%19%20%9%
2470
11th to 20thNight
40%37%14%24%11%
3037
21st to endNight
41%36%17%25%8%
4532

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
23%18%39%15%5%
270
11th to 20thDay
27%17%37%14%6%
248
21st to endDay
22%26%35%15%2
264
February1st to 10thDay
29%18%37%12%41
240
11th to 20thDay
33%19%38%7%3
240
21st to endDay
39%19%33%7%3
198
March1st to 10thDay
25%22%36%14%3
240
11th to 20thDay
26%26%29%16%3
240
21st to endDay
21%25%34%17%3
264
April1st to 10thDay
19%19%39%17%5%1
307
11th to 20thDay
23%15%30%21%9%2
412
21st to endDay
15%16%33%27%8%2
420
May1st to 10thDay
16%10%38%27%9%
460
11th to 20thDay
15%6%27%33%16%3
625
21st to endDay
13%6%23%36%17%5%
679
June1st to 10thDay
9%313%39%28%7%
630
11th to 20thDay
7%116%40%28%8%
630
21st to endDay
6%116%34%30%13%
630
July1st to 10thDay
10%111%33%34%11%
621
11th to 20thDay
5%27%32%42%11%
618
21st to endDay
6%19%34%38%13%
684
August1st to 10thDay
5%26%30%43%14%
626
11th to 20thDay
8%26%31%40%13%
508
21st to endDay
12%16%18%42%20%
495
September1st to 10thDay
9%27%26%40%17%
440
11th to 20thDay
7%211%30%36%14%
270
21st to endDay
12%310%36%29%11%
270
October1st to 10thDay
6%420%42%23%5%
270
11th to 20thDay
11%9%31%31%13%4
270
21st to endDay
25%14%29%21%10%2
297
November1st to 10thDay
14%10%32%29%13%3
270
11th to 20thDay
14%11%39%27%9%
270
21st to endDay
23%16%29%23%7%1
270
December1st to 10thDay
20%18%37%15%9%2
270
11th to 20thDay
25%16%33%20%5%1
270
21st to endDay
24%15%38%16%42
297
January1st to 10thNight
22%15%32%25%6%
950
11th to 20thNight
24%13%31%24%7%1
915
21st to endNight
22%14%34%27%4
990
February1st to 10thNight
22%13%37%23%5%
900
11th to 20thNight
26%15%36%20%4
759
21st to endNight
23%18%35%21%3
444
March1st to 10thNight
21%12%34%26%7%
540
11th to 20thNight
18%15%35%26%6%1
540
21st to endNight
17%11%39%26%7%
594
April1st to 10thNight
13%12%42%25%9%
540
11th to 20thNight
14%16%33%24%13%1
533
21st to endNight
12%10%40%26%10%1
540
May1st to 10thNight
11%8%37%31%13%1
540
11th to 20thNight
12%7%29%33%17%2
531
21st to endNight
9%325%38%22%4
584
June1st to 10thNight
5%111%39%40%4
540
11th to 20thNight
4115%44%32%4
540
21st to endNight
5%113%36%35%8%
540
July1st to 10thNight
7%17%36%41%9%
525
11th to 20thNight
415%35%46%9%
522
21st to endNight
418%35%42%10%
591
August1st to 10thNight
47%36%43%9%
537
11th to 20thNight
6%16%39%40%7%
534
21st to endNight
7%15%36%42%8%
594
September1st to 10thNight
9%16%34%41%9%
540
11th to 20thNight
11%110%29%41%7%
540
21st to endNight
8%212%38%36%4
540
October1st to 10thNight
7%214%42%30%5%
715
11th to 20thNight
13%7%24%35%19%2
720
21st to endNight
17%7%28%29%16%2
792
November1st to 10thNight
13%427%37%17%1
740
11th to 20thNight
13%9%30%35%11%1
760
21st to endNight
18%13%30%26%12%1
836
December1st to 10thNight
18%13%33%28%8%
950
11th to 20thNight
22%13%27%31%6%
950
21st to endNight
24%14%29%27%7%
1045
Page generated at 2024-01-10 18:35:26. Version ac07

Copyright 2024 Attilla Danko


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