Lipantitlan State Historic Site
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Lipantitlan State Historic Site clear sky chart from 2005-11-06 to 2024-03-08.

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
52%
23713
23%
79692
17%
23614
58%
23614
29%
46418

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
38%
943
27%
3999
11%
926
46%
926
21%
2313
January11th to 20thNight
36%
943
30%
3916
8%
930
44%
930
25%
1943
January21st to endNight
36%
861
17%
4174
12%
846
46%
846
15%
2661
February1st to 10thNight
32%
760
24%
2280
10%
760
43%
760
24%
1485
February11th to 20thNight
33%
744
19%
2218
9%
740
40%
740
26%
1386
February21st to endNight
24%
604
22%
1860
6%
604
37%
604
26%
1158
March1st to 10thNight
31%
563
21%
2063
11%
563
43%
563
20%
1283
March11th to 20thNight
31%
540
18%
1980
12%
540
39%
540
19%
1284
March21st to endNight
34%
594
24%
2178
14%
594
48%
594
28%
1224
April1st to 10thNight
32%
540
20%
1980
11%
540
45%
540
21%
1241
April11th to 20thNight
33%
533
19%
1953
13%
533
44%
533
22%
1196
April21st to endNight
29%
540
23%
1799
13%
540
43%
540
23%
1152
May1st to 10thNight
35%
540
24%
1620
16%
540
45%
540
28%
1021
May11th to 20thNight
45%
531
20%
1594
14%
531
52%
531
31%
985
May21st to endNight
50%
584
21%
1745
17%
582
58%
582
30%
1085
June1st to 10thNight
75%
540
24%
1620
25%
540
80%
540
49%
815
June11th to 20thNight
68%
540
23%
1620
23%
540
74%
540
44%
853
June21st to endNight
72%
540
19%
1620
21%
540
74%
540
36%
941
July1st to 10thNight
75%
525
15%
1575
17%
525
76%
525
34%
948
July11th to 20thNight
85%
522
23%
1566
25%
522
87%
522
47%
804
July21st to endNight
84%
591
24%
1673
26%
558
87%
558
53%
815
August1st to 10thNight
91%
537
27%
1658
30%
534
92%
534
60%
723
August11th to 20thNight
84%
534
25%
1778
30%
534
85%
534
45%
855
August21st to endNight
82%
594
17%
2132
20%
594
83%
594
35%
1127
September1st to 10thNight
75%
540
17%
1980
20%
540
75%
540
28%
1137
September11th to 20thNight
73%
540
21%
1980
26%
540
73%
540
28%
1163
September21st to endNight
74%
540
25%
1980
28%
540
75%
540
34%
1037
October1st to 10thNight
80%
540
33%
1980
35%
540
81%
540
43%
935
October11th to 20thNight
64%
634
31%
2074
25%
634
68%
634
38%
1113
October21st to endNight
58%
792
34%
2376
25%
792
62%
792
42%
1267
November1st to 10thNight
61%
740
27%
2220
20%
740
64%
740
35%
1287
November11th to 20thNight
50%
760
26%
2280
19%
760
55%
760
33%
1356
November21st to endNight
45%
948
24%
2468
13%
948
50%
948
30%
1636
December1st to 10thNight
47%
950
26%
2470
16%
950
51%
950
30%
1628
December11th to 20thNight
35%
949
22%
2902
10%
948
41%
948
21%
1956
December21st to endNight
39%
1037
15%
4381
13%
1026
44%
1026
21%
2605

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%35%5%35%5%6%8%44%
79068
Night
13%5%2442445%7%49%
80561
TransparencyDay
37%7%12%20%17%8%
78793
Night
34%6%13%21%16%9%
80356
SeeingDay
11%5%21%32%23%7%
13608
Night
15%5%23%37%19%2
23743

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
18%7%245%33345%46%
2847
11th to 20thDay
15%5%24422346%52%
2850
21st to endDay
24%6%25%4245%6%7%37%
3459
February1st to 10thDay
19%7%46%5%34346%39%
1900
11th to 20thDay
18%7%35%423445%44%
1849
21st to endDay
18%6%345%2435%5%45%
1592
March1st to 10thDay
19%7%35%5%345%5%8%36%
2057
11th to 20thDay
17%7%46%5%3445%7%38%
1980
21st to endDay
12%5%345%345%47%48%
2178
April1st to 10thDay
13%6%35%5%35%5%6%7%43%
1980
11th to 20thDay
18%6%25%5%3445%6%41%
1956
21st to endDay
12%7%25%5%345%5%7%45%
2152
May1st to 10thDay
9%5%37%5%35%5%6%7%44%
2340
11th to 20thDay
8%5%46%6%46%5%6%8%42%
2302
21st to endDay
7%5%25%6%47%7%7%10%40%
2531
June1st to 10thDay
5%424445%5%7%11%50%
2340
11th to 20thDay
44246%46%5%7%10%48%
2340
21st to endDay
8%436%6%47%6%9%10%37%
2340
July1st to 10thDay
9%6%36%6%48%6%7%10%36%
2340
11th to 20thDay
43246%5%6%6%6%10%49%
2340
21st to endDay
43245%45%6%6%11%48%
2546
August1st to 10thDay
12235%345%7%10%58%
2266
11th to 20thDay
4225%5%35%7%8%11%48%
2123
21st to endDay
5%5%26%7%47%7%8%11%38%
2221
September1st to 10thDay
9%6%37%8%6%6%7%7%9%34%
1980
11th to 20thDay
10%6%37%7%46%7%6%8%37%
1980
21st to endDay
8%425%6%45%6%6%9%45%
1980
October1st to 10thDay
6%425%5%45%5%7%8%50%
1980
11th to 20thDay
11%4244445%5%8%48%
1866
21st to endDay
10%324424445%58%
1980
November1st to 10thDay
11%5%36%6%4446%7%44%
1858
11th to 20thDay
15%5%35%5%3445%5%46%
1899
21st to endDay
16%7%46%5%345%5%5%41%
1710
December1st to 10thDay
19%6%3443445%5%43%
1710
11th to 20thDay
16%7%36%435%46%6%40%
2161
21st to endDay
16%6%26%5%34347%45%
3135
January1st to 10thNight
20%7%24323445%46%
4108
11th to 20thNight
16%5%24322246%55%
4120
21st to endNight
24%6%36%5%2345%6%36%
4238
February1st to 10thNight
18%6%25%43445%5%43%
2280
11th to 20thNight
20%7%2432345%7%45%
2218
21st to endNight
19%7%24423346%45%
1860
March1st to 10thNight
20%7%2442345%7%42%
2063
11th to 20thNight
17%8%36%5%34347%39%
1980
21st to endNight
15%6%33423347%50%
2178
April1st to 10thNight
14%6%37%5%35%5%5%9%39%
1980
11th to 20thNight
17%7%34434447%44%
1953
21st to endNight
17%7%35%43346%6%42%
1799
May1st to 10thNight
11%6%35%5%35%5%6%9%42%
1620
11th to 20thNight
11%4245%45%5%6%9%45%
1593
21st to endNight
8%6%145%45%6%8%13%40%
1745
June1st to 10thNight
5%2133245%7%10%59%
1620
11th to 20thNight
34244345%5%11%56%
1620
21st to endNight
5%324435%5%7%12%51%
1620
July1st to 10thNight
7%5%24435%47%12%47%
1620
11th to 20thNight
221233445%12%61%
1620
21st to endNight
32123235%7%11%62%
1772
August1st to 10thNight
112213349%73%
1668
11th to 20thNight
431332345%11%62%
1778
21st to endNight
4414425%5%7%11%54%
2132
September1st to 10thNight
7%426%4335%7%9%48%
1980
11th to 20thNight
9%5%35%43446%9%48%
1980
21st to endNight
7%424424449%55%
1980
October1st to 10thNight
5%31332346%7%63%
1980
11th to 20thNight
12%314422346%59%
2074
21st to endNight
10%32331333465%
2376
November1st to 10thNight
11%415%33345%6%54%
2220
11th to 20thNight
15%5%25%423346%53%
2280
21st to endNight
17%6%25%5%24446%45%
2468
December1st to 10thNight
19%6%34423445%46%
2470
11th to 20thNight
19%8%35%5%3445%6%40%
3036
21st to endNight
15%8%25%42445%6%46%
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
40%46%12%22%15%
2848
11th to 20thDay
34%38%19%22%14%
2850
21st to endDay
46%46%15%20%8%
3459
February1st to 10thDay
47%5%7%9%18%14%
1900
11th to 20thDay
42%49%16%17%11%
1859
21st to endDay
42%48%17%19%11%
1592
March1st to 10thDay
45%5%12%16%14%8%
2057
11th to 20thDay
46%6%10%11%15%12%
1980
21st to endDay
36%7%11%16%17%12%
2178
April1st to 10thDay
38%7%12%16%17%9%
1980
11th to 20thDay
43%6%8%17%14%12%
1956
21st to endDay
38%7%9%19%16%11%
2152
May1st to 10thDay
38%8%11%20%15%9%
2340
11th to 20thDay
38%7%11%20%19%4
2306
21st to endDay
36%10%13%23%17%1
2531
June1st to 10thDay
27%7%15%28%19%3
2340
11th to 20thDay
30%8%14%26%19%4
2340
21st to endDay
38%11%16%24%10%1
2340
July1st to 10thDay
40%10%18%22%9%
2276
11th to 20thDay
28%9%20%28%15%
2271
21st to endDay
26%9%24%33%7%1
2405
August1st to 10thDay
20%9%20%37%13%1
2252
11th to 20thDay
26%11%23%30%10%1
2123
21st to endDay
35%12%20%23%8%2
2221
September1st to 10thDay
45%11%14%14%12%4
1980
11th to 20thDay
41%10%15%16%14%3
1980
21st to endDay
33%9%14%19%17%8%
1980
October1st to 10thDay
30%6%13%20%25%6%
1980
11th to 20thDay
34%7%11%20%17%12%
1866
21st to endDay
28%5%8%15%25%19%
1980
November1st to 10thDay
38%6%11%17%19%9%
1858
11th to 20thDay
39%5%11%15%18%12%
1899
21st to endDay
44%5%8%15%16%11%
1710
December1st to 10thDay
42%5%9%18%18%8%
1710
11th to 20thDay
43%6%8%12%17%14%
2159
21st to endDay
40%5%7%17%21%10%
3135
January1st to 10thNight
39%48%12%16%21%
4108
11th to 20thNight
31%36%20%21%19%
4120
21st to endNight
48%47%12%20%9%
4238
February1st to 10thNight
43%5%9%12%14%16%
2280
11th to 20thNight
39%5%10%16%18%12%
2218
21st to endNight
41%48%20%16%10%
1860
March1st to 10thNight
42%6%12%16%14%10%
2063
11th to 20thNight
46%6%9%13%14%12%
1980
21st to endNight
35%5%14%18%17%12%
2178
April1st to 10thNight
42%7%12%17%14%8%
1980
11th to 20thNight
41%6%10%16%14%13%
1953
21st to endNight
42%7%9%17%15%10%
1799
May1st to 10thNight
37%7%13%19%13%10%
1620
11th to 20thNight
34%8%14%23%17%3
1594
21st to endNight
34%10%17%27%12%1
1746
June1st to 10thNight
19%7%20%34%19%2
1620
11th to 20thNight
22%7%15%36%18%2
1620
21st to endNight
26%11%21%31%10%1
1620
July1st to 10thNight
29%11%23%30%7%1
1575
11th to 20thNight
16%11%28%32%13%
1566
21st to endNight
14%9%33%36%8%
1673
August1st to 10thNight
11%7%28%44%10%
1658
11th to 20thNight
17%8%30%37%6%
1778
21st to endNight
23%11%27%29%9%1
2132
September1st to 10thNight
32%9%23%20%12%4
1980
11th to 20thNight
34%9%17%26%12%3
1980
21st to endNight
26%8%15%26%19%6%
1980
October1st to 10thNight
20%6%15%29%21%8%
1980
11th to 20thNight
28%5%12%23%19%13%
2074
21st to endNight
25%5%7%19%25%19%
2376
November1st to 10thNight
30%7%12%20%22%9%
2220
11th to 20thNight
34%5%14%18%17%12%
2280
21st to endNight
40%5%10%20%16%9%
2468
December1st to 10thNight
40%5%10%18%17%10%
2470
11th to 20thNight
45%5%6%14%14%15%
3037
21st to endNight
39%6%9%14%19%13%
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
20%9%33%26%10%3
270
11th to 20thDay
22%7%31%26%13%1
270
21st to endDay
22%12%36%18%11%1
297
February1st to 10thDay
22%13%27%24%11%3
270
11th to 20thDay
21%13%33%25%7%
270
21st to endDay
21%12%42%19%6%
225
March1st to 10thDay
21%8%38%23%10%
261
11th to 20thDay
19%12%40%23%7%
240
21st to endDay
14%12%39%30%41
264
April1st to 10thDay
14%7%43%28%9%1
240
11th to 20thDay
16%15%33%23%11%1
234
21st to endDay
13%10%39%30%7%
412
May1st to 10thDay
12%11%43%26%8%
603
11th to 20thDay
10%6%38%32%12%2
625
21st to endDay
8%5%31%38%16%1
679
June1st to 10thDay
6%215%41%30%6%
630
11th to 20thDay
5%216%45%27%5%
630
21st to endDay
9%211%39%27%12%
630
July1st to 10thDay
6%29%37%35%10%
621
11th to 20thDay
31439%43%10%
618
21st to endDay
5%7%37%38%13%
684
August1st to 10thDay
16%40%37%15%
564
11th to 20thDay
48%39%34%15%
437
21st to endDay
6%16%26%32%29%
340
September1st to 10thDay
10%17%20%40%22%
270
11th to 20thDay
8%322%43%24%
270
21st to endDay
6%8%24%40%21%
270
October1st to 10thDay
8%37%30%38%14%
270
11th to 20thDay
13%113%31%27%15%
270
21st to endDay
12%9%23%32%18%6%
297
November1st to 10thDay
16%316%31%29%5%
270
11th to 20thDay
21%5%17%28%26%3
270
21st to endDay
23%12%26%23%13%4
270
December1st to 10thDay
19%420%34%16%7%
270
11th to 20thDay
19%15%26%25%12%3
270
21st to endDay
18%10%30%29%11%2
297
January1st to 10thNight
22%7%27%32%10%1
950
11th to 20thNight
21%7%29%34%8%
950
21st to endNight
22%8%28%35%8%
868
February1st to 10thNight
22%10%31%31%5%
760
11th to 20thNight
25%8%31%32%5%
744
21st to endNight
23%10%39%24%4
604
March1st to 10thNight
23%9%31%32%5%1
563
11th to 20thNight
21%7%36%32%4
540
21st to endNight
16%8%39%32%5%
594
April1st to 10thNight
15%6%42%32%5%
540
11th to 20thNight
21%7%36%30%7%
533
21st to endNight
18%8%43%26%6%
540
May1st to 10thNight
14%6%43%33%4
540
11th to 20thNight
14%234%40%9%1
531
21st to endNight
10%231%42%15%
584
June1st to 10thNight
4115%53%25%1
540
11th to 20thNight
4119%57%18%1
540
21st to endNight
5%115%46%30%3
540
July1st to 10thNight
7%19%50%32%2
525
11th to 20thNight
216%48%40%2
522
21st to endNight
216%49%39%2
591
August1st to 10thNight
1450%41%4
537
11th to 20thNight
5%1447%40%3
534
21st to endNight
415%32%52%7%
594
September1st to 10thNight
7%436%46%7%
540
11th to 20thNight
10%15%28%49%7%
540
21st to endNight
10%17%34%44%6%
540
October1st to 10thNight
417%36%48%3
540
11th to 20thNight
13%216%43%25%2
634
21st to endNight
9%5%23%39%22%1
792
November1st to 10thNight
12%417%41%24%1
740
11th to 20thNight
16%424%36%19%1
760
21st to endNight
19%6%24%34%16%1
948
December1st to 10thNight
20%5%22%38%13%2
950
11th to 20thNight
24%7%27%33%9%
950
21st to endNight
19%7%29%35%9%1
1045
Page generated at 2024-03-05 06:23:59. Version ac07

Copyright © 2024 Attilla Danko.


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