Pushapatapa Creek Observatory
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Pushapatapa Creek Observatory clear sky chart from 2005-11-06 to 2024-01-15.

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
49%
23425
22%
74362
16%
23366
56%
23366
27%
45744

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
30%
950
25%
2458
8%
946
42%
946
28%
1594
January11th to 20thNight
31%
921
25%
2393
10%
921
41%
921
27%
1603
January21st to endNight
27%
792
25%
2376
10%
792
39%
792
21%
1571
February1st to 10thNight
27%
720
23%
2160
9%
720
38%
720
23%
1423
February11th to 20thNight
28%
703
20%
2099
7%
700
39%
700
21%
1388
February21st to endNight
20%
592
19%
1776
6%
592
31%
592
18%
1239
March1st to 10thNight
31%
680
23%
2120
12%
680
40%
680
25%
1329
March11th to 20thNight
33%
540
20%
1980
12%
540
44%
540
18%
1269
March21st to endNight
37%
594
25%
2059
17%
594
48%
594
28%
1175
April1st to 10thNight
37%
540
24%
1800
16%
540
47%
540
24%
1100
April11th to 20thNight
38%
533
23%
1775
16%
533
49%
533
26%
1084
April21st to endNight
49%
540
29%
1800
23%
540
61%
540
37%
940
May1st to 10thNight
54%
540
25%
1800
21%
540
64%
540
37%
960
May11th to 20thNight
59%
531
18%
1769
19%
531
63%
531
31%
1032
May21st to endNight
69%
584
19%
1925
19%
582
73%
582
32%
1103
June1st to 10thNight
66%
540
15%
1620
16%
540
67%
540
28%
1030
June11th to 20thNight
76%
540
20%
1450
18%
540
78%
540
36%
916
June21st to endNight
71%
540
15%
1582
15%
540
71%
540
28%
1034
July1st to 10thNight
72%
525
11%
1575
13%
525
73%
525
25%
1055
July11th to 20thNight
77%
522
13%
1579
14%
522
78%
522
25%
1052
July21st to endNight
77%
591
13%
1858
16%
558
78%
558
26%
1187
August1st to 10thNight
82%
537
11%
1778
14%
534
82%
534
31%
1037
August11th to 20thNight
74%
534
13%
1776
15%
534
74%
534
22%
1189
August21st to endNight
71%
594
15%
1980
18%
594
72%
594
23%
1310
September1st to 10thNight
70%
540
19%
1800
22%
540
70%
540
26%
1137
September11th to 20thNight
66%
584
23%
1844
22%
584
67%
584
28%
1143
September21st to endNight
66%
720
28%
1980
21%
720
69%
720
35%
1203
October1st to 10thNight
64%
720
30%
2036
22%
720
68%
720
43%
1125
October11th to 20thNight
58%
720
35%
2160
26%
720
66%
720
40%
1165
October21st to endNight
52%
792
32%
2376
26%
792
58%
792
36%
1340
November1st to 10thNight
56%
740
31%
2220
24%
740
64%
740
37%
1233
November11th to 20thNight
46%
760
30%
2427
22%
760
57%
760
34%
1342
November21st to endNight
42%
760
28%
2470
20%
760
53%
760
27%
1479
December1st to 10thNight
36%
760
27%
2470
18%
760
48%
760
25%
1539
December11th to 20thNight
32%
759
22%
2907
13%
758
41%
758
18%
1842
December21st to endNight
27%
887
13%
4184
9%
874
35%
874
13%
2576

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%6%36%6%45%5%6%8%40%
74837
Night
12%5%25%5%3446%8%46%
74896
TransparencyDay
42%8%11%17%17%6%
74573
Night
36%7%12%18%18%8%
74680
SeeingDay
14%9%20%25%22%11%
13666
Night
14%8%22%29%22%5%
23432

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%7%35%42445%5%44%
1707
11th to 20thDay
17%7%24434346%44%
1656
21st to endDay
18%8%35%42333446%
1973
February1st to 10thDay
17%8%46%5%3445%6%38%
1800
11th to 20thDay
19%7%345%2335%7%42%
1748
21st to endDay
18%8%36%5%35%447%36%
1480
March1st to 10thDay
17%7%35%6%3445%6%41%
1854
11th to 20thDay
16%8%35%6%3445%7%39%
1980
21st to endDay
11%6%36%5%35%5%5%7%45%
2294
April1st to 10thDay
13%6%25%5%36%6%5%8%41%
2160
11th to 20thDay
16%6%36%4345%6%7%41%
2134
21st to endDay
8%6%25%5%36%6%6%8%46%
2160
May1st to 10thDay
12%5%25%6%35%6%5%8%43%
2160
11th to 20thDay
11%6%27%6%46%5%5%9%40%
2124
21st to endDay
8%5%36%9%5%7%6%7%10%34%
2341
June1st to 10thDay
10%6%36%7%5%7%7%9%9%31%
2340
11th to 20thDay
5%437%8%6%7%7%8%11%34%
2503
21st to endDay
7%7%38%8%5%8%8%9%11%27%
2367
July1st to 10thDay
10%7%48%9%6%9%8%8%8%23%
2340
11th to 20thDay
10%5%37%9%6%8%9%8%9%25%
2322
21st to endDay
10%6%37%7%48%7%8%10%30%
2350
August1st to 10thDay
5%5%37%10%47%7%8%10%33%
2148
11th to 20thDay
12%7%38%7%5%6%6%7%8%30%
2125
21st to endDay
12%5%26%7%5%7%7%8%9%31%
2376
September1st to 10thDay
10%6%37%6%5%7%6%6%8%35%
2160
11th to 20thDay
11%6%27%7%35%5%5%8%41%
2095
21st to endDay
10%5%245%35%5%47%50%
1980
October1st to 10thDay
6%5%25%435%5%6%5%55%
1919
11th to 20thDay
9%4145%35%45%7%54%
1800
21st to endDay
10%5%245%34446%55%
1980
November1st to 10thDay
10%425%5%2445%6%52%
1858
11th to 20thDay
11%5%2343435%6%54%
1748
21st to endDay
15%6%345%3345%6%45%
1710
December1st to 10thDay
15%6%36%5%35%5%5%6%43%
1710
11th to 20thDay
15%9%46%5%24445%40%
2153
21st to endDay
16%7%25%5%345%6%7%39%
3282
January1st to 10thNight
19%6%33323446%47%
2458
11th to 20thNight
18%6%35%424446%45%
2393
21st to endNight
20%7%35%43434443%
2376
February1st to 10thNight
18%7%35%43445%6%40%
2160
11th to 20thNight
21%7%44433336%42%
2098
21st to endNight
21%8%35%5%345%5%6%36%
1776
March1st to 10thNight
15%6%35%5%2445%7%45%
2120
11th to 20thNight
16%7%36%6%35%45%7%39%
1980
21st to endNight
14%5%2433345%6%51%
2059
April1st to 10thNight
14%6%35%5%34448%45%
1800
11th to 20thNight
14%5%25%6%35%45%6%45%
1775
21st to endNight
8%42442446%6%58%
1800
May1st to 10thNight
10%31432445%8%55%
1800
11th to 20thNight
8%425%5%3446%10%48%
1769
21st to endNight
6%325%435%5%7%12%46%
1925
June1st to 10thNight
9%5%26%7%346%8%11%39%
1620
11th to 20thNight
3325%6%46%6%7%10%49%
1450
21st to endNight
7%5%25%5%47%7%6%11%41%
1582
July1st to 10thNight
6%435%6%37%7%9%13%36%
1620
11th to 20thNight
5%425%5%47%8%9%14%37%
1633
21st to endNight
5%4246%47%7%7%12%40%
1968
August1st to 10thNight
33245%36%6%10%13%44%
1790
11th to 20thNight
7%425%6%47%7%9%14%35%
1776
21st to endNight
9%6%26%6%45%6%7%10%39%
1980
September1st to 10thNight
7%5%26%6%46%5%8%9%41%
1800
11th to 20thNight
9%5%25%5%35%5%6%9%44%
1844
21st to endNight
9%425%5%4445%7%51%
1980
October1st to 10thNight
7%32443345%6%59%
2036
11th to 20thNight
8%43342336%6%59%
2160
21st to endNight
12%5%2433334457%
2376
November1st to 10thNight
11%424323345%59%
2220
11th to 20thNight
13%42232345%6%55%
2427
21st to endNight
14%6%34433447%47%
2470
December1st to 10thNight
16%8%25%42345%6%45%
2470
11th to 20thNight
17%8%36%5%3445%5%43%
3042
21st to endNight
18%9%36%5%34345%41%
4363

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
41%46%16%22%9%
1708
11th to 20thDay
43%4415%25%9%
1656
21st to endDay
43%35%16%22%10%
1973
February1st to 10thDay
48%47%14%17%10%
1800
11th to 20thDay
43%46%17%20%9%
1758
21st to endDay
48%6%7%13%16%9%
1480
March1st to 10thDay
44%6%7%15%20%9%
1854
11th to 20thDay
45%6%9%13%19%7%
1980
21st to endDay
39%6%10%17%21%7%
2294
April1st to 10thDay
40%7%9%17%18%8%
2160
11th to 20thDay
42%6%8%17%19%8%
2134
21st to endDay
35%7%10%20%23%4
2160
May1st to 10thDay
37%7%10%19%21%6%
2160
11th to 20thDay
41%7%11%22%17%1
2128
21st to endDay
42%9%13%21%13%2
2341
June1st to 10thDay
45%11%14%21%8%1
2340
11th to 20thDay
40%11%17%19%11%2
2503
21st to endDay
47%13%15%18%6%1
2367
July1st to 10thDay
54%13%15%12%41
2276
11th to 20thDay
49%14%18%15%41
2253
21st to endDay
45%12%18%18%6%1
2219
August1st to 10thDay
41%14%20%16%9%
2136
11th to 20thDay
50%12%15%15%7%1
2125
21st to endDay
45%12%16%15%9%2
2376
September1st to 10thDay
44%11%13%16%12%5%
2160
11th to 20thDay
42%8%11%17%16%7%
2095
21st to endDay
34%6%11%21%19%9%
1980
October1st to 10thDay
29%7%11%18%23%13%
1919
11th to 20thDay
30%5%8%16%28%14%
1800
21st to endDay
31%46%16%26%16%
1980
November1st to 10thDay
33%47%17%26%13%
1858
11th to 20thDay
32%5%6%16%29%13%
1748
21st to endDay
40%47%17%22%11%
1710
December1st to 10thDay
41%6%9%18%19%8%
1710
11th to 20thDay
46%5%6%12%24%8%
2150
21st to endDay
42%6%9%17%21%3
3282
January1st to 10thNight
38%48%15%26%8%
2458
11th to 20thNight
41%5%6%17%22%9%
2393
21st to endNight
45%45%12%25%9%
2376
February1st to 10thNight
44%47%17%18%9%
2160
11th to 20thNight
46%45%14%21%11%
2099
21st to endNight
48%6%9%13%12%12%
1776
March1st to 10thNight
39%5%9%15%22%10%
2120
11th to 20thNight
44%7%10%14%18%7%
1980
21st to endNight
34%5%11%19%23%7%
2059
April1st to 10thNight
39%5%10%17%18%10%
1800
11th to 20thNight
39%5%10%20%18%9%
1775
21st to endNight
26%6%13%21%27%8%
1800
May1st to 10thNight
28%5%11%27%23%7%
1800
11th to 20thNight
31%8%17%22%18%2
1770
21st to endNight
28%10%19%24%16%2
1926
June1st to 10thNight
35%11%18%25%11%1
1620
11th to 20thNight
27%13%19%27%12%2
1450
21st to endNight
35%12%20%22%10%1
1582
July1st to 10thNight
33%16%25%19%6%1
1575
11th to 20thNight
31%18%28%17%41
1579
21st to endNight
32%15%26%21%5%1
1858
August1st to 10thNight
25%15%31%21%8%
1778
11th to 20thNight
34%18%23%17%6%2
1776
21st to endNight
38%12%21%17%9%4
1980
September1st to 10thNight
36%10%19%15%13%6%
1800
11th to 20thNight
34%10%16%18%14%9%
1844
21st to endNight
32%7%11%24%16%10%
1980
October1st to 10thNight
26%5%12%19%23%15%
2036
11th to 20thNight
26%6%8%20%26%15%
2160
21st to endNight
30%47%15%26%18%
2376
November1st to 10thNight
29%47%19%25%16%
2220
11th to 20thNight
30%5%7%15%27%15%
2427
21st to endNight
38%46%20%20%13%
2470
December1st to 10thNight
40%5%7%21%20%7%
2470
11th to 20thNight
44%46%12%21%12%
3044
21st to endNight
46%5%7%17%19%6%
4363

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%18%35%17%41
270
11th to 20thDay
22%15%36%19%7%
252
21st to endDay
27%25%33%13%2
264
February1st to 10thDay
28%25%27%16%5%
240
11th to 20thDay
32%18%30%17%2
240
21st to endDay
21%28%37%14%1
198
March1st to 10thDay
22%19%39%18%3
240
11th to 20thDay
26%24%30%18%3
240
21st to endDay
19%18%32%23%8%1
380
April1st to 10thDay
18%15%31%23%11%1
420
11th to 20thDay
23%15%25%22%13%1
412
21st to endDay
11%9%30%32%15%2
420
May1st to 10thDay
13%11%24%29%18%4
423
11th to 20thDay
13%5%21%33%20%9%
447
21st to endDay
6%220%32%29%12%
485
June1st to 10thDay
13%211%32%26%15%
450
11th to 20thDay
6%213%36%29%13%
613
21st to endDay
10%215%26%29%18%
630
July1st to 10thDay
10%26%24%38%19%
621
11th to 20thDay
9%15%22%39%24%
600
21st to endDay
11%2421%37%25%
488
August1st to 10thDay
418%20%36%32%
446
11th to 20thDay
10%6%18%36%29%
439
21st to endDay
13%29%20%31%25%
495
September1st to 10thDay
10%19%26%36%18%
450
11th to 20thDay
10%411%26%34%14%
450
21st to endDay
12%311%31%34%10%
450
October1st to 10thDay
6%8%19%35%24%7%
389
11th to 20thDay
9%9%21%33%23%5%
270
21st to endDay
19%10%22%29%16%4
297
November1st to 10thDay
15%8%27%33%16%1
270
11th to 20thDay
16%16%29%27%11%1
270
21st to endDay
16%18%33%20%11%3
270
December1st to 10thDay
21%11%35%24%7%1
270
11th to 20thDay
24%20%33%18%5%
270
21st to endDay
25%18%29%21%6%1
297
January1st to 10thNight
23%14%30%27%6%
950
11th to 20thNight
22%12%31%28%7%
921
21st to endNight
23%15%32%26%4
792
February1st to 10thNight
22%14%33%27%4
720
11th to 20thNight
25%17%27%26%6%
703
21st to endNight
23%20%33%21%3
592
March1st to 10thNight
19%15%31%28%7%
680
11th to 20thNight
19%11%32%31%7%1
540
21st to endNight
18%10%32%30%10%
594
April1st to 10thNight
19%10%30%30%11%1
540
11th to 20thNight
16%9%31%29%14%
533
21st to endNight
9%6%31%39%14%
540
May1st to 10thNight
10%5%27%39%18%1
540
11th to 20thNight
8%322%39%24%4
531
21st to endNight
7%215%39%31%7%
584
June1st to 10thNight
9%38%36%38%7%
540
11th to 20thNight
327%34%44%10%
540
21st to endNight
7%19%29%37%16%
540
July1st to 10thNight
5%15%22%49%19%
525
11th to 20thNight
5%15%17%47%25%
522
21st to endNight
5%15%23%47%20%
591
August1st to 10thNight
5%319%48%26%
537
11th to 20thNight
7%1417%48%23%
534
21st to endNight
9%26%20%41%21%
594
September1st to 10thNight
8%26%27%42%15%
540
11th to 20thNight
10%38%27%43%10%
584
21st to endNight
11%112%31%38%7%
720
October1st to 10thNight
8%217%36%33%4
720
11th to 20thNight
9%5%22%35%25%4
720
21st to endNight
14%8%22%33%21%2
792
November1st to 10thNight
13%6%20%37%21%2
740
11th to 20thNight
15%8%27%33%15%1
760
21st to endNight
18%8%27%31%14%2
760
December1st to 10thNight
18%14%28%27%13%
760
11th to 20thNight
22%9%33%28%9%
760
21st to endNight
27%13%29%26%6%
893
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