Matagorda Bay Nature Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Matagorda Bay Nature Park clear sky chart from 2005-11-06 to 2024-02-25.

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
59%
23711
21%
79669
18%
23621
62%
23621
27%
48313

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
40%
940
21%
4036
10%
926
48%
926
16%
2737
January11th to 20thNight
41%
944
24%
3963
10%
930
47%
930
21%
2239
January21st to endNight
41%
1035
15%
4465
10%
1023
47%
1023
16%
2960
February1st to 10thNight
42%
776
22%
2296
12%
776
48%
776
23%
1540
February11th to 20thNight
43%
744
19%
2218
12%
740
47%
740
25%
1430
February21st to endNight
37%
458
22%
1678
16%
458
44%
458
20%
1062
March1st to 10thNight
45%
540
21%
1980
16%
540
52%
540
21%
1219
March11th to 20thNight
48%
540
18%
1980
16%
540
52%
540
20%
1273
March21st to endNight
53%
594
23%
2178
21%
594
59%
594
28%
1240
April1st to 10thNight
50%
540
21%
1980
20%
540
56%
540
22%
1219
April11th to 20thNight
49%
533
20%
1873
17%
533
56%
533
24%
1134
April21st to endNight
50%
540
24%
1800
23%
540
56%
540
26%
1075
May1st to 10thNight
57%
540
23%
1752
24%
540
62%
540
28%
1034
May11th to 20thNight
67%
531
23%
1594
25%
531
69%
531
35%
928
May21st to endNight
70%
582
21%
1745
24%
582
71%
582
34%
1033
June1st to 10thNight
82%
540
22%
1620
27%
540
82%
540
43%
861
June11th to 20thNight
80%
540
21%
1620
25%
540
80%
540
39%
911
June21st to endNight
77%
540
16%
1620
20%
540
77%
540
31%
1005
July1st to 10thNight
74%
525
13%
1575
16%
525
74%
525
28%
1003
July11th to 20thNight
87%
522
19%
1566
24%
522
87%
522
42%
845
July21st to endNight
85%
591
19%
1673
22%
558
86%
558
42%
917
August1st to 10thNight
91%
537
23%
1601
26%
534
92%
534
51%
788
August11th to 20thNight
82%
534
22%
1675
25%
534
82%
534
38%
921
August21st to endNight
79%
594
16%
2135
20%
594
79%
594
31%
1185
September1st to 10thNight
76%
540
15%
1980
18%
540
76%
540
26%
1181
September11th to 20thNight
69%
540
18%
1980
22%
540
69%
540
22%
1243
September21st to endNight
72%
540
25%
1980
29%
540
72%
540
28%
1146
October1st to 10thNight
77%
584
29%
2024
30%
584
77%
584
36%
1064
October11th to 20thNight
71%
720
32%
2160
26%
720
73%
720
41%
1191
October21st to endNight
64%
792
31%
2376
24%
792
68%
792
40%
1308
November1st to 10thNight
70%
740
24%
2220
20%
740
71%
740
35%
1302
November11th to 20thNight
56%
760
26%
2280
20%
760
60%
760
30%
1401
November21st to endNight
50%
801
25%
2321
17%
801
56%
801
27%
1527
December1st to 10thNight
50%
950
24%
2470
15%
950
54%
950
29%
1672
December11th to 20thNight
43%
948
20%
2886
11%
948
47%
948
21%
1947
December21st to endNight
39%
1036
14%
4369
10%
1026
45%
1026
16%
2772

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
12%5%25%5%35%5%6%9%42%
78869
Night
12%6%35%5%3445%8%45%
80485
TransparencyDay
36%9%16%20%13%5%
78594
Night
36%7%14%20%15%8%
80280
SeeingDay
11%312%27%33%13%
13676
Night
13%415%30%30%7%
23750

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%10%36%6%35%5%5%6%34%
2847
11th to 20thDay
15%6%2443345%6%46%
2850
21st to endDay
22%9%26%4345%6%6%32%
3135
February1st to 10thDay
19%8%47%5%44345%37%
1900
11th to 20thDay
20%7%46%424345%39%
1849
21st to endDay
19%8%35%5%2435%6%40%
1672
March1st to 10thDay
17%8%36%5%3445%7%39%
1980
11th to 20thDay
16%7%36%5%24447%42%
1980
21st to endDay
14%5%25%5%2445%8%45%
2178
April1st to 10thDay
14%8%36%435%6%5%8%39%
1980
11th to 20thDay
15%6%36%6%245%5%8%39%
2034
21st to endDay
11%5%35%5%346%5%6%48%
2160
May1st to 10thDay
10%426%5%36%5%6%10%43%
2203
11th to 20thDay
8%5%25%5%35%5%7%9%45%
2302
21st to endDay
7%425%5%36%7%9%12%40%
2531
June1st to 10thDay
4324335%5%8%12%51%
2340
11th to 20thDay
6%3145%36%6%8%13%44%
2340
21st to endDay
6%5%245%46%8%10%13%36%
2340
July1st to 10thDay
10%5%35%5%36%7%8%12%37%
2340
11th to 20thDay
4315%5%36%7%9%13%43%
2340
21st to endDay
43245%36%7%9%14%43%
2546
August1st to 10thDay
3213325%6%9%15%51%
2328
11th to 20thDay
5%3245%36%7%10%15%40%
2223
21st to endDay
7%425%6%46%7%8%13%39%
2214
September1st to 10thDay
8%5%26%6%47%7%8%12%34%
1980
11th to 20thDay
12%5%25%6%5%5%7%6%9%38%
1980
21st to endDay
8%5%36%5%25%6%7%9%44%
1980
October1st to 10thDay
5%324435%5%5%10%54%
1918
11th to 20thDay
11%425%424446%53%
1800
21st to endDay
11%5%25%433445%55%
1980
November1st to 10thDay
10%5%26%5%35%5%6%9%44%
1858
11th to 20thDay
15%5%25%4345%46%46%
1900
21st to endDay
17%7%36%5%34447%40%
1855
December1st to 10thDay
18%7%35%5%24446%41%
1710
11th to 20thDay
13%7%36%6%35%46%7%40%
2161
21st to endDay
16%6%36%5%345%5%6%39%
3135
January1st to 10thNight
19%10%37%5%34445%35%
4108
11th to 20thNight
15%6%35%5%23347%47%
4120
21st to endNight
22%8%36%43446%8%33%
4532
February1st to 10thNight
16%8%36%5%34446%40%
2296
11th to 20thNight
19%7%34424346%44%
2218
21st to endNight
18%8%45%5%23445%42%
1678
March1st to 10thNight
16%7%35%43445%7%42%
1980
11th to 20thNight
13%8%35%5%35%447%41%
1980
21st to endNight
12%5%245%2335%8%50%
2178
April1st to 10thNight
13%8%35%5%245%5%9%39%
1980
11th to 20thNight
15%6%25%424347%46%
1873
21st to endNight
13%6%26%5%3445%9%44%
1800
May1st to 10thNight
10%5%35%5%25%5%6%9%45%
1752
11th to 20thNight
9%5%244346%6%10%48%
1593
21st to endNight
7%4345%346%8%12%43%
1745
June1st to 10thNight
5%313435%5%5%11%55%
1620
11th to 20thNight
5%324425%6%7%12%48%
1620
21st to endNight
6%325%5%37%6%8%12%42%
1620
July1st to 10thNight
6%5%36%5%45%6%7%12%39%
1620
11th to 20thNight
22135%346%7%14%53%
1620
21st to endNight
33234346%8%14%51%
1772
August1st to 10thNight
1112325%5%7%13%62%
1611
11th to 20thNight
4324435%5%8%13%51%
1675
21st to endNight
6%3245%345%8%13%48%
2135
September1st to 10thNight
6%5%25%6%36%6%7%11%43%
1980
11th to 20thNight
11%7%25%5%345%6%10%41%
1980
21st to endNight
8%425%5%345%6%9%48%
1980
October1st to 10thNight
4425%5%35%5%6%9%54%
2024
11th to 20thNight
8%33442335%7%58%
2160
21st to endNight
9%333433346%60%
2376
November1st to 10thNight
9%4245%35%5%5%7%53%
2220
11th to 20thNight
14%6%25%434346%48%
2280
21st to endNight
15%6%35%5%35%45%6%44%
2321
December1st to 10thNight
18%6%35%42435%8%42%
2470
11th to 20thNight
14%8%36%6%35%5%6%7%38%
3036
21st to endNight
16%7%36%6%3445%6%41%
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
47%8%7%15%14%9%
2848
11th to 20thDay
34%9%13%17%16%11%
2850
21st to endDay
51%5%5%15%18%6%
3135
February1st to 10thDay
51%5%7%12%14%11%
1900
11th to 20thDay
48%6%9%14%16%7%
1859
21st to endDay
44%7%13%15%14%7%
1672
March1st to 10thDay
45%7%14%15%14%5%
1980
11th to 20thDay
43%8%11%14%17%8%
1980
21st to endDay
36%7%15%17%18%7%
2178
April1st to 10thDay
42%9%13%18%13%6%
1980
11th to 20thDay
42%8%13%16%14%8%
2034
21st to endDay
35%7%13%24%15%7%
2160
May1st to 10thDay
35%9%17%21%13%6%
2203
11th to 20thDay
32%9%17%24%15%2
2306
21st to endDay
31%10%22%26%10%1
2531
June1st to 10thDay
23%9%22%33%13%1
2340
11th to 20thDay
27%11%19%30%12%1
2340
21st to endDay
34%13%23%25%5%
2340
July1st to 10thDay
36%12%24%23%4
2276
11th to 20thDay
27%14%31%23%5%
2271
21st to endDay
26%14%30%26%4
2405
August1st to 10thDay
20%12%29%32%6%
2314
11th to 20thDay
26%15%32%23%4
2223
21st to endDay
33%13%24%21%7%2
2214
September1st to 10thDay
38%14%19%17%11%2
1980
11th to 20thDay
39%12%15%19%12%2
1980
21st to endDay
34%10%14%19%17%6%
1980
October1st to 10thDay
25%8%15%26%20%7%
1918
11th to 20thDay
31%6%11%21%19%12%
1800
21st to endDay
32%5%8%19%22%15%
1980
November1st to 10thDay
34%9%12%20%17%7%
1858
11th to 20thDay
40%6%12%17%14%11%
1900
21st to endDay
45%6%10%17%14%8%
1855
December1st to 10thDay
44%7%11%18%16%5%
1710
11th to 20thDay
42%8%9%14%17%11%
2159
21st to endDay
43%6%10%16%15%10%
3135
January1st to 10thNight
48%7%7%10%15%13%
4108
11th to 20thNight
36%5%8%17%22%12%
4120
21st to endNight
49%5%6%13%18%9%
4532
February1st to 10thNight
46%5%10%11%16%13%
2296
11th to 20thNight
41%6%9%16%17%11%
2218
21st to endNight
44%6%8%16%19%8%
1678
March1st to 10thNight
41%7%13%18%14%8%
1980
11th to 20thNight
43%8%12%13%15%9%
1980
21st to endNight
35%6%12%19%19%10%
2178
April1st to 10thNight
40%7%12%18%16%7%
1980
11th to 20thNight
38%7%11%18%14%12%
1873
21st to endNight
38%5%12%21%16%7%
1800
May1st to 10thNight
34%8%14%20%15%9%
1752
11th to 20thNight
30%7%16%25%18%3
1594
21st to endNight
30%9%21%26%13%1
1746
June1st to 10thNight
23%7%20%33%16%1
1620
11th to 20thNight
26%8%16%34%14%2
1620
21st to endNight
31%11%24%26%7%1
1620
July1st to 10thNight
36%10%26%24%5%
1575
11th to 20thNight
19%12%32%29%8%
1566
21st to endNight
19%12%31%33%41
1673
August1st to 10thNight
13%11%29%40%7%
1601
11th to 20thNight
23%11%29%33%4
1675
21st to endNight
27%11%27%26%8%1
2135
September1st to 10thNight
32%12%22%19%12%3
1980
11th to 20thNight
38%11%15%21%14%2
1980
21st to endNight
32%10%13%22%18%6%
1980
October1st to 10thNight
26%7%15%23%18%11%
2024
11th to 20thNight
26%6%9%25%22%12%
2160
21st to endNight
26%6%9%17%24%17%
2376
November1st to 10thNight
31%7%14%20%20%8%
2220
11th to 20thNight
37%5%12%19%18%9%
2280
21st to endNight
41%6%10%18%17%7%
2321
December1st to 10thNight
40%7%11%20%15%7%
2470
11th to 20thNight
43%7%11%12%13%14%
3037
21st to endNight
43%7%7%14%20%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
21%7%25%34%12%
270
11th to 20thDay
19%10%21%35%15%
270
21st to endDay
19%9%29%31%13%
297
February1st to 10thDay
22%6%28%33%11%1
270
11th to 20thDay
26%9%20%31%13%1
270
21st to endDay
20%9%26%40%5%
210
March1st to 10thDay
23%6%27%36%9%
240
11th to 20thDay
21%6%30%32%9%1
240
21st to endDay
14%7%28%41%9%
264
April1st to 10thDay
17%5%34%33%11%
240
11th to 20thDay
18%5%28%31%18%1
312
21st to endDay
14%5%22%40%19%
420
May1st to 10thDay
13%419%43%20%1
466
11th to 20thDay
9%415%40%29%4
625
21st to endDay
6%210%40%38%3
679
June1st to 10thDay
6%1431%47%11%
630
11th to 20thDay
6%1429%51%10%
630
21st to endDay
9%1320%49%18%
630
July1st to 10thDay
8%1415%48%24%
621
11th to 20thDay
316%56%33%
618
21st to endDay
5%210%54%29%
684
August1st to 10thDay
1111%48%38%
626
11th to 20thDay
4117%43%44%
537
21st to endDay
7%1410%39%39%
333
September1st to 10thDay
9%1215%41%32%
270
11th to 20thDay
10%217%41%29%
270
21st to endDay
9%414%55%19%
270
October1st to 10thDay
5%2427%48%14%
270
11th to 20thDay
11%17%28%37%16%
270
21st to endDay
15%5%18%30%29%3
297
November1st to 10thDay
11%315%30%33%8%
270
11th to 20thDay
19%212%36%27%4
270
21st to endDay
19%9%24%31%13%4
270
December1st to 10thDay
17%418%34%21%5%
270
11th to 20thDay
21%9%21%37%10%1
270
21st to endDay
19%5%21%38%14%3
297
January1st to 10thNight
20%7%27%31%14%1
950
11th to 20thNight
19%7%27%34%13%
950
21st to endNight
21%6%25%37%11%
1045
February1st to 10thNight
21%6%24%37%11%
776
11th to 20thNight
22%10%19%35%13%
744
21st to endNight
21%10%24%36%9%
458
March1st to 10thNight
20%6%22%37%15%
540
11th to 20thNight
17%6%22%41%15%1
540
21st to endNight
14%424%41%16%2
594
April1st to 10thNight
16%424%42%15%
540
11th to 20thNight
17%7%22%36%18%
533
21st to endNight
14%5%24%39%16%1
540
May1st to 10thNight
13%321%45%18%
540
11th to 20thNight
11%213%45%26%3
531
21st to endNight
7%211%40%38%2
584
June1st to 10thNight
5%1428%56%6%
540
11th to 20thNight
6%331%54%6%
540
21st to endNight
6%1422%49%18%
540
July1st to 10thNight
5%2418%50%22%
525
11th to 20thNight
2211%54%31%
522
21st to endNight
31111%57%26%
591
August1st to 10thNight
118%59%31%
537
11th to 20thNight
427%61%26%
534
21st to endNight
6%211%52%29%
594
September1st to 10thNight
6%1311%54%25%
540
11th to 20thNight
13%1316%50%18%
540
21st to endNight
9%5%22%52%12%
540
October1st to 10thNight
5%27%24%50%12%
584
11th to 20thNight
9%212%30%41%6%
720
21st to endNight
11%316%32%33%5%
792
November1st to 10thNight
10%311%32%38%6%
740
11th to 20thNight
16%317%35%27%3
760
21st to endNight
16%422%37%19%3
801
December1st to 10thNight
20%6%18%31%22%3
950
11th to 20thNight
19%7%23%34%17%
950
21st to endNight
21%8%23%33%14%2
1045
Page generated at 2024-02-22 05:05:42. Version ac07

Copyright 2024 Attilla Danko


Matagorda Bay Nature Park Clear Sky Chart |Charts Home