Lunar Crater
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Lunar Crater 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
66%
23577
30%
74390
26%
23539
73%
23539
47%
36750

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
62%
756
24%
2646
21%
756
70%
756
37%
1356
January11th to 20thNight
68%
732
25%
2562
24%
732
74%
732
42%
1246
January21st to endNight
62%
792
28%
2572
25%
792
69%
792
35%
1419
February1st to 10thNight
61%
720
29%
2160
23%
720
70%
720
46%
1117
February11th to 20thNight
61%
700
28%
2098
24%
700
68%
700
44%
1113
February21st to endNight
55%
592
27%
1776
24%
592
62%
592
42%
945
March1st to 10thNight
58%
720
27%
2160
23%
720
67%
720
41%
1174
March11th to 20thNight
57%
720
27%
2039
21%
720
65%
720
41%
1159
March21st to endNight
51%
792
27%
2116
16%
792
60%
792
45%
1170
April1st to 10thNight
56%
720
30%
1800
15%
720
63%
720
48%
1009
April11th to 20thNight
50%
711
31%
1779
14%
711
57%
711
50%
986
April21st to endNight
53%
589
32%
1669
17%
589
61%
589
48%
864
May1st to 10thNight
50%
540
30%
1620
18%
540
57%
540
44%
808
May11th to 20thNight
60%
531
31%
1594
24%
531
65%
531
49%
774
May21st to endNight
56%
583
23%
1746
16%
582
63%
582
36%
943
June1st to 10thNight
70%
414
31%
1494
31%
414
78%
414
55%
599
June11th to 20thNight
66%
360
33%
1440
37%
360
75%
360
51%
553
June21st to endNight
76%
360
33%
1440
38%
360
84%
360
58%
519
July1st to 10thNight
80%
350
29%
1400
38%
350
83%
350
50%
557
July11th to 20thNight
78%
348
28%
1392
34%
348
80%
348
40%
625
July21st to endNight
75%
559
26%
1644
26%
528
77%
528
40%
861
August1st to 10thNight
73%
537
33%
1602
26%
534
76%
534
50%
783
August11th to 20thNight
83%
669
33%
1737
21%
669
84%
669
65%
845
August21st to endNight
83%
792
37%
1980
24%
792
84%
792
69%
971
September1st to 10thNight
81%
720
39%
1826
25%
720
85%
720
70%
874
September11th to 20thNight
78%
720
39%
1980
29%
720
83%
720
65%
917
September21st to endNight
78%
720
43%
1980
35%
720
84%
720
70%
891
October1st to 10thNight
69%
720
36%
1980
27%
720
77%
720
58%
983
October11th to 20thNight
76%
720
43%
2054
37%
720
82%
720
63%
939
October21st to endNight
73%
792
40%
2574
36%
792
83%
792
63%
1052
November1st to 10thNight
73%
740
35%
2405
34%
740
80%
740
56%
1053
November11th to 20thNight
73%
760
37%
2470
35%
760
80%
760
58%
1061
November21st to endNight
69%
760
35%
2470
32%
760
76%
760
52%
1132
December1st to 10thNight
62%
760
29%
2470
25%
760
68%
760
40%
1277
December11th to 20thNight
60%
759
25%
2947
22%
758
67%
758
29%
1653
December21st to endNight
55%
819
16%
4768
21%
817
64%
817
20%
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
342342445%7%64%
74933
Night
442342445%7%62%
74812
TransparencyDay
20%49%19%25%23%
74646
Night
21%5%10%21%25%19%
74620
SeeingDay
5%7%19%31%26%12%
13850
Night
5%319%43%27%3
23604

By Month

Percentage Cloud Cover SW (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
45%25%5%3445%11%51%
1519
11th to 20thDay
45%25%5%2448%9%53%
1459
21st to endDay
5%7%25%4245%6%9%51%
1776
February1st to 10thDay
4325%4245%6%10%56%
1800
11th to 20thDay
5%5%246%35%448%54%
1750
21st to endDay
48%3443345%8%54%
1480
March1st to 10thDay
48%35%44445%8%52%
1800
11th to 20thDay
35%2442446%9%57%
1920
21st to endDay
46%2443445%8%56%
2237
April1st to 10thDay
34245%3446%7%58%
2160
11th to 20thDay
45%24324446%63%
2129
21st to endDay
442332435%6%65%
2290
May1st to 10thDay
3424434447%62%
2340
11th to 20thDay
35%2442445%8%58%
2301
21st to endDay
4425%5%346%6%7%56%
2530
June1st to 10thDay
231332445%8%66%
2460
11th to 20thDay
2213323335%73%
2520
21st to endDay
2212223235%77%
2520
July1st to 10thDay
2213333446%68%
2520
11th to 20thDay
331342446%5%65%
2520
21st to endDay
4223437%5%6%7%57%
2576
August1st to 10thDay
331332233472%
2328
11th to 20thDay
2212323346%73%
2160
21st to endDay
2212223435%74%
2376
September1st to 10thDay
221232334474%
2134
11th to 20thDay
2112213335%77%
1980
21st to endDay
221221123480%
1980
October1st to 10thDay
3113422336%71%
1980
11th to 20thDay
2312212335%75%
1902
21st to endDay
3212222346%75%
1782
November1st to 10thDay
241332445%8%64%
1674
11th to 20thDay
1312112449%71%
1710
21st to endDay
3414433446%64%
1710
December1st to 10thDay
45%2342345%6%61%
1710
11th to 20thDay
7%10%35%5%3445%9%44%
2106
21st to endDay
35%25%5%35%6%7%9%50%
2794
January1st to 10thNight
46%244245%6%9%54%
2646
11th to 20thNight
34234245%5%10%58%
2562
21st to endNight
47%245%45%45%8%52%
2572
February1st to 10thNight
442442445%8%59%
2160
11th to 20thNight
5%6%234245%5%7%58%
2098
21st to endNight
37%25%5%35%35%7%57%
1776
March1st to 10thNight
46%244345%47%56%
2160
11th to 20thNight
46%35%43446%8%53%
2039
21st to endNight
5%6%24323447%59%
2116
April1st to 10thNight
5%42432435%7%60%
1800
11th to 20thNight
35%23424435%64%
1779
21st to endNight
5%424423346%64%
1669
May1st to 10thNight
34144345%5%8%59%
1620
11th to 20thNight
6%423423346%65%
1594
21st to endNight
4425%5%446%6%8%53%
1746
June1st to 10thNight
32123235%5%8%66%
1494
11th to 20thNight
3313223335%72%
1440
21st to endNight
3212323345%73%
1440
July1st to 10thNight
3313315%45%5%68%
1440
11th to 20thNight
4334425%447%59%
1440
21st to endNight
43246%35%5%5%7%54%
1741
August1st to 10thNight
44124245%5%6%63%
1611
11th to 20thNight
3212223435%72%
1737
21st to endNight
221232335%7%71%
1980
September1st to 10thNight
3211223345%74%
1826
11th to 20thNight
2112222335%75%
1980
21st to endNight
221222222479%
1980
October1st to 10thNight
421432334469%
1980
11th to 20thNight
2312213335%75%
2054
21st to endNight
221222333476%
2574
November1st to 10thNight
4313223347%69%
2405
11th to 20thNight
2313323347%70%
2470
21st to endNight
231432445%6%65%
2470
December1st to 10thNight
45%24434447%59%
2470
11th to 20thNight
7%7%35%43445%9%47%
3081
21st to endNight
35%36%7%46%5%6%8%46%
4862

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
27%7%19%31%15%1
1519
11th to 20thDay
26%5%19%26%18%6%
1459
21st to endDay
30%6%15%28%17%4
1776
February1st to 10thDay
24%6%14%28%22%6%
1800
11th to 20thDay
28%411%26%25%5%
1760
21st to endDay
26%6%13%28%22%5%
1480
March1st to 10thDay
31%49%27%24%4
1800
11th to 20thDay
24%5%10%30%23%9%
1920
21st to endDay
26%5%14%29%22%5%
2237
April1st to 10thDay
25%5%10%24%21%14%
2160
11th to 20thDay
21%5%9%21%28%16%
2132
21st to endDay
19%49%23%35%9%
2290
May1st to 10thDay
21%46%18%35%16%
2340
11th to 20thDay
23%47%19%32%15%
2304
21st to endDay
24%6%8%19%29%14%
2530
June1st to 10thDay
16%37%16%28%30%
2460
11th to 20thDay
14%3410%26%44%
2520
21st to endDay
11%236%22%56%
2520
July1st to 10thDay
16%447%15%54%
2451
11th to 20thDay
19%36%10%19%43%
2445
21st to endDay
23%6%9%13%18%32%
2433
August1st to 10thDay
16%349%18%50%
2313
11th to 20thDay
12%35%10%20%50%
2160
21st to endDay
13%35%11%23%46%
2376
September1st to 10thDay
13%45%8%22%49%
2134
11th to 20thDay
11%35%14%26%42%
1980
21st to endDay
11%2411%36%37%
1980
October1st to 10thDay
15%37%13%35%26%
1980
11th to 20thDay
13%35%18%36%26%
1902
21st to endDay
11%35%25%39%17%
1782
November1st to 10thDay
18%311%28%29%11%
1674
11th to 20thDay
13%410%31%35%7%
1710
21st to endDay
20%312%26%31%7%
1710
December1st to 10thDay
22%6%14%28%22%8%
1710
11th to 20thDay
34%8%13%24%18%3
2105
21st to endDay
28%8%18%23%19%4
2794
January1st to 10thNight
26%6%19%30%17%2
2646
11th to 20thNight
22%6%18%27%20%7%
2562
21st to endNight
30%5%15%25%21%4
2572
February1st to 10thNight
23%415%31%22%5%
2160
11th to 20thNight
24%5%14%22%28%8%
2099
21st to endNight
26%415%27%23%5%
1776
March1st to 10thNight
25%6%13%29%22%4
2160
11th to 20thNight
27%5%10%26%23%8%
2039
21st to endNight
25%415%30%20%6%
2116
April1st to 10thNight
23%411%27%24%12%
1800
11th to 20thNight
21%48%25%27%15%
1779
21st to endNight
22%38%24%34%9%
1669
May1st to 10thNight
22%48%18%34%15%
1620
11th to 20thNight
20%47%15%36%18%
1595
21st to endNight
26%7%8%18%29%12%
1746
June1st to 10thNight
13%48%15%30%30%
1494
11th to 20thNight
15%35%9%25%42%
1440
21st to endNight
12%347%23%52%
1440
July1st to 10thNight
16%449%11%56%
1400
11th to 20thNight
23%45%10%16%42%
1392
21st to endNight
24%7%9%14%13%32%
1644
August1st to 10thNight
21%35%9%15%46%
1602
11th to 20thNight
12%5%6%9%19%48%
1737
21st to endNight
12%36%11%22%46%
1980
September1st to 10thNight
11%36%8%21%51%
1826
11th to 20thNight
12%35%11%26%43%
1980
21st to endNight
12%1412%28%43%
1980
October1st to 10thNight
17%37%15%30%28%
1980
11th to 20thNight
13%3318%34%28%
2054
21st to endNight
11%35%22%40%19%
2574
November1st to 10thNight
15%310%24%32%15%
2405
11th to 20thNight
14%49%28%36%9%
2470
21st to endNight
18%310%27%33%9%
2470
December1st to 10thNight
25%6%13%25%24%8%
2470
11th to 20thNight
29%8%13%26%20%3
3081
21st to endNight
33%8%16%22%18%3
4862

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
11%318%39%23%6%
180
11th to 20thDay
10%5%13%32%27%13%
165
21st to endDay
7%5%12%32%31%12%
275
February1st to 10thDay
46%26%33%21%9%
420
11th to 20thDay
8%9%20%38%17%8%
415
21st to endDay
5%10%26%38%17%5%
346
March1st to 10thDay
10%11%24%30%21%5%
420
11th to 20thDay
6%11%27%34%17%5%
420
21st to endDay
10%14%33%29%11%3
462
April1st to 10thDay
6%16%26%28%18%6%
420
11th to 20thDay
8%17%29%26%16%4
412
21st to endDay
8%14%25%29%15%10%
420
May1st to 10thDay
5%13%27%28%20%7%
423
11th to 20thDay
7%11%21%28%23%10%
448
21st to endDay
7%9%20%28%24%11%
485
June1st to 10thDay
39%19%28%27%15%
450
11th to 20thDay
411%22%27%27%10%
450
21st to endDay
3317%31%33%13%
450
July1st to 10thDay
3115%35%33%13%
446
11th to 20thDay
3112%31%37%15%
444
21st to endDay
428%34%35%16%
487
August1st to 10thDay
4319%33%26%15%
447
11th to 20thDay
3213%29%31%23%
437
21st to endDay
2212%32%34%18%
495
September1st to 10thDay
25%13%28%30%22%
450
11th to 20thDay
29%14%30%31%14%
450
21st to endDay
36%14%28%35%14%
450
October1st to 10thDay
19%20%29%26%16%
450
11th to 20thDay
46%17%25%30%18%
406
21st to endDay
5%5%12%34%31%13%
297
November1st to 10thDay
46%17%32%27%14%
270
11th to 20thDay
15%10%45%22%17%
270
21st to endDay
4316%31%31%14%
270
December1st to 10thDay
7%414%37%29%10%
270
11th to 20thDay
6%415%39%29%8%
252
21st to endDay
7%9%16%34%26%8%
198
January1st to 10thNight
5%419%42%24%6%
760
11th to 20thNight
4219%45%25%5%
732
21st to endNight
7%319%44%22%5%
792
February1st to 10thNight
6%223%44%22%3
720
11th to 20thNight
6%323%44%21%3
704
21st to endNight
6%427%45%16%3
592
March1st to 10thNight
6%6%23%45%18%2
720
11th to 20thNight
6%5%23%41%22%3
720
21st to endNight
7%8%29%40%14%1
792
April1st to 10thNight
5%8%25%42%19%1
720
11th to 20thNight
5%8%30%37%18%2
711
21st to endNight
6%7%29%37%19%3
589
May1st to 10thNight
5%7%29%42%15%2
540
11th to 20thNight
7%7%20%41%25%2
531
21st to endNight
6%8%22%37%24%3
584
June1st to 10thNight
2417%43%31%2
414
11th to 20thNight
3323%46%25%1
360
21st to endNight
2214%50%31%1
360
July1st to 10thNight
48%51%35%2
350
11th to 20thNight
317%49%38%3
348
21st to endNight
417%48%38%2
559
August1st to 10thNight
5%113%52%27%1
537
11th to 20thNight
218%41%44%4
669
21st to endNight
218%42%45%3
792
September1st to 10thNight
2211%35%46%4
720
11th to 20thNight
2213%40%39%5%
720
21st to endNight
3214%38%36%8%
720
October1st to 10thNight
4219%42%29%5%
720
11th to 20thNight
4114%41%34%5%
720
21st to endNight
3220%37%33%5%
792
November1st to 10thNight
4316%38%33%6%
740
11th to 20thNight
3117%48%27%5%
760
21st to endNight
3121%41%29%4
760
December1st to 10thNight
7%218%50%19%5%
760
11th to 20thNight
8%320%44%22%3
760
21st to endNight
6%324%47%19%2
836
Page generated at 2024-01-10 16:35:22. Version ac07

Copyright 2024 Attilla Danko


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