Pearland
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Pearland clear sky chart from 2005-11-06 to 2024-02-20.

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
53%
23799
23%
79513
18%
23698
59%
23698
28%
47490

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
36%
946
23%
4008
11%
926
43%
926
18%
2546
January11th to 20thNight
38%
946
26%
3952
10%
930
45%
930
21%
2257
January21st to endNight
35%
1036
16%
4463
10%
1023
43%
1023
16%
2911
February1st to 10thNight
31%
874
21%
2394
8%
874
38%
874
23%
1651
February11th to 20thNight
35%
705
20%
2175
11%
701
42%
701
23%
1416
February21st to endNight
26%
444
22%
1628
12%
444
37%
444
16%
1073
March1st to 10thNight
35%
540
23%
1980
13%
540
47%
540
21%
1239
March11th to 20thNight
37%
540
20%
1980
13%
540
45%
540
21%
1246
March21st to endNight
41%
594
24%
2178
19%
594
52%
594
27%
1257
April1st to 10thNight
37%
540
21%
1980
16%
540
48%
540
21%
1241
April11th to 20thNight
39%
533
22%
1811
16%
533
49%
533
23%
1117
April21st to endNight
41%
540
24%
1800
21%
540
50%
540
25%
1109
May1st to 10thNight
45%
540
21%
1786
20%
540
51%
540
25%
1088
May11th to 20thNight
55%
531
24%
1594
24%
531
58%
531
33%
950
May21st to endNight
61%
583
22%
1746
22%
582
66%
582
33%
1032
June1st to 10thNight
79%
540
22%
1620
26%
540
81%
540
45%
849
June11th to 20thNight
77%
540
21%
1620
24%
540
80%
540
45%
852
June21st to endNight
73%
540
16%
1620
19%
540
75%
540
33%
990
July1st to 10thNight
76%
525
14%
1575
19%
525
76%
525
32%
959
July11th to 20thNight
84%
522
21%
1566
25%
522
85%
522
43%
834
July21st to endNight
82%
591
18%
1673
22%
558
83%
558
42%
897
August1st to 10thNight
91%
537
24%
1601
27%
534
91%
534
58%
741
August11th to 20thNight
85%
534
22%
1703
26%
534
85%
534
41%
907
August21st to endNight
77%
594
18%
2008
21%
594
78%
594
31%
1166
September1st to 10thNight
78%
540
16%
1980
20%
540
79%
540
30%
1115
September11th to 20thNight
67%
540
22%
1980
26%
540
68%
540
26%
1183
September21st to endNight
72%
540
28%
1980
31%
540
73%
540
33%
1057
October1st to 10thNight
76%
634
32%
2074
31%
634
77%
634
43%
1038
October11th to 20thNight
64%
720
33%
2160
25%
720
68%
720
42%
1168
October21st to endNight
58%
792
34%
2376
25%
792
63%
792
38%
1312
November1st to 10thNight
64%
740
29%
2220
24%
740
66%
740
38%
1246
November11th to 20thNight
56%
760
30%
2280
22%
760
62%
760
33%
1356
November21st to endNight
44%
783
27%
2303
18%
783
51%
783
28%
1468
December1st to 10thNight
42%
950
26%
2470
14%
950
47%
950
28%
1668
December11th to 20thNight
37%
949
22%
2880
11%
948
42%
948
22%
1913
December21st to endNight
34%
1036
14%
4349
10%
1026
40%
1026
17%
2638

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%36%6%45%5%6%8%39%
78841
Night
13%6%25%43445%8%47%
80395
TransparencyDay
41%6%11%19%15%7%
78566
Night
37%5%12%21%17%8%
80190
SeeingDay
14%6%19%27%23%11%
13787
Night
15%5%20%33%24%3
23827

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
19%10%26%424445%41%
2847
11th to 20thDay
14%7%24323337%52%
2850
21st to endDay
23%9%35%5%2445%6%34%
3135
February1st to 10thDay
21%8%37%5%35%45%5%34%
1800
11th to 20thDay
22%9%35%5%33445%36%
1873
21st to endDay
22%7%25%5%34445%38%
1628
March1st to 10thDay
21%7%36%6%43446%34%
1980
11th to 20thDay
17%8%47%5%34446%38%
1980
21st to endDay
17%6%25%43445%8%42%
2178
April1st to 10thDay
15%7%38%5%345%5%7%37%
1980
11th to 20thDay
17%7%36%5%3446%7%37%
2097
21st to endDay
11%6%36%6%46%5%6%6%43%
2160
May1st to 10thDay
11%7%36%6%345%6%8%40%
2168
11th to 20thDay
10%5%36%7%45%5%6%9%39%
2302
21st to endDay
9%6%37%7%5%8%8%8%11%28%
2531
June1st to 10thDay
6%5%25%7%46%6%8%10%40%
2340
11th to 20thDay
5%436%6%48%8%9%11%38%
2340
21st to endDay
8%5%38%8%5%9%8%9%10%26%
2340
July1st to 10thDay
10%5%46%7%48%8%9%11%28%
2340
11th to 20thDay
5%427%8%47%7%8%12%33%
2340
21st to endDay
5%436%6%5%9%8%9%12%33%
2546
August1st to 10thDay
4325%7%48%8%9%12%40%
2328
11th to 20thDay
5%427%7%48%7%9%12%36%
2194
21st to endDay
9%5%26%7%5%8%8%8%10%32%
2341
September1st to 10thDay
7%6%37%7%5%7%8%8%10%33%
1980
11th to 20thDay
15%7%26%6%46%8%7%8%31%
1980
21st to endDay
9%6%26%6%35%5%6%8%44%
1980
October1st to 10thDay
7%425%4345%6%7%52%
1867
11th to 20thDay
10%5%3443446%7%49%
1800
21st to endDay
13%5%25%424346%53%
1980
November1st to 10thDay
10%5%35%5%45%46%8%45%
1858
11th to 20thDay
13%5%36%43446%6%45%
1900
21st to endDay
16%7%37%5%35%445%41%
1872
December1st to 10thDay
17%6%35%5%4445%7%40%
1710
11th to 20thDay
14%7%45%6%35%5%6%6%40%
2161
21st to endDay
16%7%2443445%7%43%
3135
January1st to 10thNight
20%8%35%5%33446%39%
4108
11th to 20thNight
17%6%25%423346%49%
4120
21st to endNight
24%9%35%42335%7%35%
4532
February1st to 10thNight
20%8%36%5%3435%6%38%
2394
11th to 20thNight
21%8%35%423235%43%
2175
21st to endNight
24%8%25%5%24336%38%
1628
March1st to 10thNight
20%7%35%32345%6%41%
1980
11th to 20thNight
16%9%35%5%3445%7%40%
1980
21st to endNight
15%5%34423447%49%
2178
April1st to 10thNight
14%6%46%5%345%5%8%39%
1980
11th to 20thNight
20%6%3432445%7%43%
1811
21st to endNight
13%6%35%7%35%45%8%43%
1800
May1st to 10thNight
11%6%25%6%26%5%6%9%41%
1786
11th to 20thNight
9%6%245%35%5%6%9%48%
1593
21st to endNight
6%5%35%5%45%5%8%11%44%
1745
June1st to 10thNight
5%32342347%12%55%
1620
11th to 20thNight
5%2234245%8%11%55%
1620
21st to endNight
6%425%5%46%7%7%11%44%
1620
July1st to 10thNight
5%5%35%4345%8%12%44%
1620
11th to 20thNight
32135%345%6%11%58%
1620
21st to endNight
33234345%7%13%52%
1772
August1st to 10thNight
111131335%11%68%
1611
11th to 20thNight
42134345%8%13%54%
1703
21st to endNight
5%325%5%45%6%6%11%48%
2008
September1st to 10thNight
4425%6%45%5%8%11%47%
1980
11th to 20thNight
11%6%35%6%345%5%8%44%
1980
21st to endNight
9%5%2443445%8%53%
1980
October1st to 10thNight
5%42342445%7%61%
2074
11th to 20thNight
9%41232345%7%59%
2160
21st to endNight
10%5%23433335%60%
2376
November1st to 10thNight
9%4244335%5%6%56%
2220
11th to 20thNight
12%5%2442446%5%52%
2280
21st to endNight
16%6%35%435%45%5%46%
2303
December1st to 10thNight
17%7%25%5%3435%6%42%
2470
11th to 20thNight
15%8%35%6%345%46%42%
3036
21st to endNight
16%7%36%5%34445%44%
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%3418%19%9%
2848
11th to 20thDay
34%45%26%20%11%
2850
21st to endDay
51%3416%16%10%
3135
February1st to 10thDay
53%45%13%14%11%
1800
11th to 20thDay
51%47%13%17%9%
1883
21st to endDay
50%47%15%15%9%
1628
March1st to 10thDay
51%5%8%14%16%6%
1980
11th to 20thDay
48%49%12%19%9%
1980
21st to endDay
41%5%10%16%22%7%
2178
April1st to 10thDay
46%5%8%18%14%8%
1980
11th to 20thDay
46%48%16%16%9%
2097
21st to endDay
40%6%8%19%20%7%
2160
May1st to 10thDay
43%6%9%18%17%7%
2168
11th to 20thDay
40%6%10%23%17%3
2306
21st to endDay
45%9%13%20%12%1
2531
June1st to 10thDay
34%9%16%25%15%1
2340
11th to 20thDay
37%8%13%26%14%2
2340
21st to endDay
45%10%17%20%8%
2340
July1st to 10thDay
42%10%21%22%6%
2276
11th to 20thDay
38%10%23%23%6%
2271
21st to endDay
36%11%22%27%41
2405
August1st to 10thDay
30%9%22%29%9%
2314
11th to 20thDay
35%11%21%26%6%1
2194
21st to endDay
42%11%19%20%8%2
2341
September1st to 10thDay
42%9%15%18%12%4
1980
11th to 20thDay
46%9%12%17%13%3
1980
21st to endDay
37%6%12%19%17%9%
1980
October1st to 10thDay
30%5%8%26%20%12%
1867
11th to 20thDay
33%6%7%20%21%14%
1800
21st to endDay
33%45%18%23%17%
1980
November1st to 10thDay
36%5%10%19%22%8%
1858
11th to 20thDay
39%5%10%15%20%12%
1900
21st to endDay
45%47%17%17%10%
1872
December1st to 10thDay
43%5%8%20%16%7%
1710
11th to 20thDay
42%5%10%14%20%9%
2159
21st to endDay
41%47%16%20%12%
3135
January1st to 10thNight
46%47%15%15%13%
4108
11th to 20thNight
39%35%17%25%11%
4120
21st to endNight
50%3416%17%10%
4532
February1st to 10thNight
48%47%12%17%13%
2394
11th to 20thNight
46%37%14%18%13%
2175
21st to endNight
50%45%14%16%11%
1628
March1st to 10thNight
44%5%9%18%16%9%
1980
11th to 20thNight
44%5%11%13%18%8%
1980
21st to endNight
37%411%18%21%9%
2178
April1st to 10thNight
43%6%10%18%15%9%
1980
11th to 20thNight
41%5%10%17%15%13%
1811
21st to endNight
41%5%9%21%17%8%
1800
May1st to 10thNight
39%6%11%20%16%8%
1786
11th to 20thNight
33%6%12%25%20%4
1594
21st to endNight
32%8%19%28%12%1
1746
June1st to 10thNight
23%6%21%31%19%
1620
11th to 20thNight
23%5%19%32%18%2
1620
21st to endNight
32%8%22%26%11%
1620
July1st to 10thNight
32%9%27%27%6%
1575
11th to 20thNight
22%8%32%32%7%
1566
21st to endNight
22%9%31%32%5%
1673
August1st to 10thNight
13%6%31%40%9%
1601
11th to 20thNight
21%10%29%32%6%1
1703
21st to endNight
28%12%23%28%7%2
2008
September1st to 10thNight
29%10%24%20%13%4
1980
11th to 20thNight
37%7%15%23%16%3
1980
21st to endNight
30%5%14%23%20%8%
1980
October1st to 10thNight
24%410%30%20%12%
2074
11th to 20thNight
25%5%9%24%23%13%
2160
21st to endNight
29%46%17%24%20%
2376
November1st to 10thNight
30%5%11%23%22%10%
2220
11th to 20thNight
34%5%9%22%20%11%
2280
21st to endNight
41%48%20%18%9%
2303
December1st to 10thNight
44%47%21%14%9%
2470
11th to 20thNight
43%5%8%12%18%14%
3037
21st to endNight
42%5%6%14%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
25%12%35%18%9%1
270
11th to 20thDay
21%13%34%25%6%1
270
21st to endDay
20%15%36%22%7%
297
February1st to 10thDay
22%18%34%18%7%
270
11th to 20thDay
28%18%28%20%6%1
267
21st to endDay
29%16%39%15%11
198
March1st to 10thDay
24%18%35%18%4
240
11th to 20thDay
18%18%42%16%43
240
21st to endDay
23%16%34%18%8%
264
April1st to 10thDay
17%18%36%23%6%
240
11th to 20thDay
25%14%23%24%13%2
375
21st to endDay
17%10%30%27%14%1
420
May1st to 10thDay
17%7%31%29%15%1
431
11th to 20thDay
13%429%33%17%3
625
21st to endDay
11%424%40%18%4
679
June1st to 10thDay
8%214%35%30%11%
630
11th to 20thDay
7%213%38%28%12%
630
21st to endDay
12%39%29%30%18%
630
July1st to 10thDay
9%26%29%32%21%
621
11th to 20thDay
6%1327%37%25%
618
21st to endDay
5%2429%37%24%
684
August1st to 10thDay
4425%43%24%
626
11th to 20thDay
6%1319%41%31%
508
21st to endDay
13%25%15%32%34%
460
September1st to 10thDay
9%15%25%39%22%
270
11th to 20thDay
12%26%27%37%15%
270
21st to endDay
12%1430%40%13%
270
October1st to 10thDay
9%110%41%32%8%
270
11th to 20thDay
13%5%15%37%19%11%
270
21st to endDay
19%11%26%24%18%3
297
November1st to 10thDay
14%423%36%19%4
270
11th to 20thDay
18%5%28%32%14%3
270
21st to endDay
19%15%34%20%9%3
270
December1st to 10thDay
21%5%32%26%11%5%
270
11th to 20thDay
21%14%33%24%7%1
270
21st to endDay
20%10%37%22%10%2
297
January1st to 10thNight
21%9%30%30%10%
950
11th to 20thNight
22%8%26%35%8%1
950
21st to endNight
21%9%29%34%6%
1045
February1st to 10thNight
24%9%30%31%6%
874
11th to 20thNight
26%10%25%31%8%
705
21st to endNight
26%12%33%25%5%
444
March1st to 10thNight
25%7%29%31%8%
540
11th to 20thNight
19%10%30%33%7%1
540
21st to endNight
19%6%31%34%11%1
594
April1st to 10thNight
15%9%33%36%7%
540
11th to 20thNight
23%7%26%33%12%
533
21st to endNight
17%7%29%34%12%1
540
May1st to 10thNight
15%6%27%41%10%
540
11th to 20thNight
12%424%42%17%1
531
21st to endNight
6%321%43%25%2
584
June1st to 10thNight
6%26%45%38%3
540
11th to 20thNight
5%28%46%37%3
540
21st to endNight
6%19%29%47%8%
540
July1st to 10thNight
6%2431%48%10%
525
11th to 20thNight
31227%56%11%
522
21st to endNight
5%1226%57%9%
591
August1st to 10thNight
1226%62%9%
537
11th to 20thNight
5%1121%62%11%
534
21st to endNight
7%1319%55%15%
594
September1st to 10thNight
5%1421%56%13%
540
11th to 20thNight
13%1426%49%7%
540
21st to endNight
13%16%29%45%7%
540
October1st to 10thNight
7%29%35%42%7%
634
11th to 20thNight
9%318%39%27%4
720
21st to endNight
12%6%20%35%24%3
792
November1st to 10thNight
11%216%42%27%2
740
11th to 20thNight
14%422%40%19%
760
21st to endNight
19%7%26%31%15%2
783
December1st to 10thNight
20%7%25%30%16%1
950
11th to 20thNight
21%9%25%33%10%
950
21st to endNight
21%8%29%32%9%1
1045
Page generated at 2024-02-17 05:28:37. Version ac07

Copyright 2024 Attilla Danko


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