Craters Of The Moon National Monument
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Craters Of The Moon National Monument 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
57%
23500
22%
74675
18%
23460
63%
23460
32%
43502

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
48%
756
11%
2646
9%
756
52%
756
15%
1892
January11th to 20thNight
55%
728
17%
2548
16%
728
60%
728
21%
1643
January21st to endNight
52%
792
16%
2665
14%
792
56%
792
19%
1811
February1st to 10thNight
46%
720
13%
2340
8%
720
52%
720
22%
1534
February11th to 20thNight
48%
704
18%
2177
13%
700
55%
700
27%
1372
February21st to endNight
46%
592
18%
1776
12%
592
54%
592
25%
1144
March1st to 10thNight
52%
720
17%
2129
13%
720
58%
720
28%
1372
March11th to 20thNight
57%
720
21%
1980
15%
720
62%
720
35%
1206
March21st to endNight
47%
792
16%
2178
10%
792
51%
792
28%
1424
April1st to 10thNight
53%
720
21%
1862
11%
720
58%
720
34%
1174
April11th to 20thNight
46%
556
23%
1624
12%
556
54%
556
30%
1002
April21st to endNight
56%
540
26%
1620
17%
540
62%
540
38%
908
May1st to 10thNight
53%
540
22%
1620
16%
540
57%
540
36%
920
May11th to 20thNight
57%
531
21%
1594
17%
531
62%
531
34%
918
May21st to endNight
51%
513
15%
1676
16%
512
55%
512
27%
1009
June1st to 10thNight
66%
360
21%
1260
23%
360
74%
360
34%
663
June11th to 20thNight
59%
360
25%
1260
25%
360
69%
360
38%
623
June21st to endNight
72%
360
30%
1285
37%
360
80%
360
53%
543
July1st to 10thNight
78%
350
26%
1400
37%
350
84%
350
53%
540
July11th to 20thNight
85%
348
31%
1392
43%
348
90%
348
59%
505
July21st to endNight
77%
486
31%
1575
35%
459
81%
459
51%
705
August1st to 10thNight
70%
537
27%
1602
24%
534
73%
534
46%
837
August11th to 20thNight
78%
534
38%
1602
30%
534
80%
534
60%
735
August21st to endNight
72%
606
37%
1794
28%
606
74%
606
52%
887
September1st to 10thNight
74%
720
34%
1894
23%
720
79%
720
60%
957
September11th to 20thNight
73%
720
34%
1980
28%
720
77%
720
52%
1029
September21st to endNight
67%
720
35%
1980
27%
720
72%
720
51%
1034
October1st to 10thNight
65%
720
28%
2015
23%
720
68%
720
44%
1106
October11th to 20thNight
63%
720
32%
2160
25%
720
71%
720
46%
1100
October21st to endNight
59%
792
27%
2547
20%
792
68%
792
38%
1355
November1st to 10thNight
56%
740
24%
2405
22%
740
60%
740
31%
1398
November11th to 20thNight
52%
760
21%
2470
16%
760
59%
760
30%
1442
November21st to endNight
59%
904
21%
2614
15%
904
65%
904
33%
1585
December1st to 10thNight
49%
950
15%
2664
10%
950
54%
950
25%
1797
December11th to 20thNight
46%
948
13%
3398
8%
948
51%
948
17%
2358
December21st to endNight
41%
941
8%
4943
7%
936
47%
936
12%
2974

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
45%25%5%35%5%6%8%52%
74618
Night
45%35%5%35%5%6%8%50%
75101
TransparencyDay
31%5%12%23%19%10%
74326
Night
33%6%13%22%17%9%
74914
SeeingDay
6%9%26%32%21%5%
13789
Night
7%5%23%42%21%3
23521

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
37%49%9%5%7%8%7%10%30%
1519
11th to 20thDay
37%38%7%46%6%7%10%38%
1456
21st to endDay
310%410%7%47%6%7%9%33%
1688
February1st to 10thDay
25%36%5%47%9%8%10%40%
1620
11th to 20thDay
27%49%8%47%7%8%9%36%
1668
21st to endDay
25%48%7%5%7%7%8%9%38%
1480
March1st to 10thDay
35%46%6%47%7%8%9%41%
1829
11th to 20thDay
46%36%6%46%6%6%8%44%
1980
21st to endDay
48%36%7%5%7%7%7%11%36%
2178
April1st to 10thDay
36%36%7%45%6%8%9%42%
2096
11th to 20thDay
46%36%6%46%6%6%7%46%
2282
21st to endDay
6%6%25%5%46%5%6%9%47%
2340
May1st to 10thDay
5%5%35%6%36%5%6%8%48%
2340
11th to 20thDay
7%6%36%6%36%5%7%9%43%
2301
21st to endDay
8%6%36%6%446%8%9%40%
2595
June1st to 10thDay
4425%5%45%6%8%8%48%
2695
11th to 20thDay
4425%4345%5%8%55%
2700
21st to endDay
2112324347%70%
2668
July1st to 10thDay
211232346%7%69%
2520
11th to 20thDay
2212213335%77%
2520
21st to endDay
431332445%7%64%
2647
August1st to 10thDay
44133345%5%7%61%
2328
11th to 20thDay
212223346%73%
2299
21st to endDay
3213323446%69%
2559
September1st to 10thDay
2213323345%72%
2066
11th to 20thDay
332332345%7%64%
1980
21st to endDay
5%424322446%64%
1980
October1st to 10thDay
8%4245%345%5%6%53%
1944
11th to 20thDay
2425%4345%5%7%59%
1800
21st to endDay
44144345%6%9%57%
1805
November1st to 10thDay
46%36%5%37%5%6%9%47%
1674
11th to 20thDay
25%246%46%7%9%9%45%
1710
21st to endDay
37%36%5%35%6%6%8%48%
1544
December1st to 10thDay
37%5%8%8%5%7%6%5%7%38%
1511
11th to 20thDay
410%39%8%5%7%7%7%9%33%
1685
21st to endDay
47%49%8%45%5%6%8%42%
2611
January1st to 10thNight
49%49%8%5%7%7%7%8%32%
2646
11th to 20thNight
27%38%6%46%6%7%10%41%
2548
21st to endNight
410%48%7%45%6%6%9%36%
2665
February1st to 10thNight
26%47%6%46%7%9%11%37%
2340
11th to 20thNight
46%36%5%46%7%5%10%43%
2176
21st to endNight
27%47%7%5%7%6%8%10%38%
1776
March1st to 10thNight
37%35%6%47%6%7%9%44%
2129
11th to 20thNight
45%246%35%7%6%10%48%
1980
21st to endNight
5%7%36%7%45%5%6%8%43%
2178
April1st to 10thNight
5%7%36%5%35%5%7%9%46%
1862
11th to 20thNight
45%37%5%5%5%5%7%7%47%
1624
21st to endNight
46%35%335%45%9%53%
1620
May1st to 10thNight
46%35%5%35%5%6%8%52%
1620
11th to 20thNight
5%5%25%5%46%6%8%10%45%
1594
21st to endNight
10%6%35%5%25%5%8%9%42%
1676
June1st to 10thNight
43145%46%6%6%10%50%
1260
11th to 20thNight
5%3145%35%45%9%56%
1260
21st to endNight
2113443446%69%
1285
July1st to 10thNight
111232446%8%69%
1440
11th to 20thNight
1112223347%74%
1440
21st to endNight
22233245%45%68%
1668
August1st to 10thNight
33145%4446%8%58%
1611
11th to 20thNight
221332345%6%70%
1602
21st to endNight
3313425%45%5%67%
1794
September1st to 10thNight
2213223445%71%
1894
11th to 20thNight
4313324446%65%
1980
21st to endNight
6%223423445%65%
1980
October1st to 10thNight
7%42442345%8%57%
2015
11th to 20thNight
442432345%8%61%
2160
21st to endNight
3414435%5%6%9%55%
2547
November1st to 10thNight
5%5%36%5%45%5%6%8%49%
2405
11th to 20thNight
2426%6%35%7%7%9%48%
2470
21st to endNight
3435%6%36%6%7%9%49%
2614
December1st to 10thNight
37%48%7%46%6%7%9%40%
2664
11th to 20thNight
410%48%8%5%6%6%7%9%33%
3506
21st to endNight
48%48%6%47%6%6%7%40%
5072

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
49%9%19%16%6%1
1519
11th to 20thDay
43%9%16%20%8%3
1456
21st to endDay
48%11%14%18%7%1
1688
February1st to 10thDay
37%10%21%24%6%2
1620
11th to 20thDay
42%8%19%21%9%1
1677
21st to endDay
40%10%16%23%8%2
1480
March1st to 10thDay
37%8%20%23%11%1
1829
11th to 20thDay
37%7%17%26%12%1
1980
21st to endDay
42%7%20%22%8%1
2178
April1st to 10thDay
37%8%17%22%14%2
2096
11th to 20thDay
35%5%14%27%17%2
2285
21st to endDay
35%412%30%18%1
2340
May1st to 10thDay
32%411%28%22%3
2340
11th to 20thDay
37%5%10%30%15%3
2304
21st to endDay
37%414%28%14%2
2595
June1st to 10thDay
31%415%28%20%2
2695
11th to 20thDay
27%410%21%24%14%
2700
21st to endDay
15%35%21%37%20%
2668
July1st to 10thDay
14%3317%34%30%
2451
11th to 20thDay
12%3212%27%44%
2445
21st to endDay
19%3413%24%38%
2500
August1st to 10thDay
23%36%16%28%24%
2313
11th to 20thDay
13%3321%36%24%
2299
21st to endDay
16%35%21%33%22%
2559
September1st to 10thDay
16%35%17%33%27%
2066
11th to 20thDay
20%39%26%28%13%
1980
21st to endDay
23%27%28%28%11%
1980
October1st to 10thDay
31%413%25%21%5%
1944
11th to 20thDay
25%5%14%35%17%4
1800
21st to endDay
24%7%21%26%20%2
1805
November1st to 10thDay
37%5%19%22%16%1
1674
11th to 20thDay
33%9%21%27%7%2
1710
21st to endDay
36%6%19%25%12%2
1544
December1st to 10thDay
47%9%15%20%7%2
1511
11th to 20thDay
51%6%18%21%4
1684
21st to endDay
42%6%17%18%15%2
2611
January1st to 10thNight
49%11%16%17%6%1
2646
11th to 20thNight
42%9%15%22%10%3
2548
21st to endNight
47%8%15%19%9%2
2665
February1st to 10thNight
41%9%19%22%7%2
2340
11th to 20thNight
37%8%17%25%10%2
2177
21st to endNight
40%7%18%22%11%3
1776
March1st to 10thNight
38%8%17%25%9%2
2129
11th to 20thNight
31%8%17%26%15%3
1980
21st to endNight
39%7%18%26%9%1
2178
April1st to 10thNight
33%7%15%23%17%4
1862
11th to 20thNight
36%6%10%28%19%2
1624
21st to endNight
30%411%31%23%1
1620
May1st to 10thNight
30%5%9%31%21%4
1620
11th to 20thNight
32%5%12%29%19%3
1595
21st to endNight
38%5%12%28%14%3
1676
June1st to 10thNight
29%5%15%26%22%4
1260
11th to 20thNight
25%49%20%28%14%
1260
21st to endNight
16%35%18%32%26%
1285
July1st to 10thNight
15%3415%34%30%
1400
11th to 20thNight
12%3113%22%48%
1392
21st to endNight
18%3312%23%42%
1575
August1st to 10thNight
23%45%17%20%30%
1602
11th to 20thNight
15%3216%33%31%
1602
21st to endNight
20%3414%27%31%
1794
September1st to 10thNight
17%35%11%31%33%
1894
11th to 20thNight
21%46%23%27%20%
1980
21st to endNight
22%36%23%32%13%
1980
October1st to 10thNight
27%410%27%24%8%
2015
11th to 20thNight
23%311%35%24%4
2160
21st to endNight
26%6%15%29%22%2
2547
November1st to 10thNight
34%6%14%23%20%3
2405
11th to 20thNight
32%7%19%27%11%3
2470
21st to endNight
32%7%17%27%14%3
2614
December1st to 10thNight
40%9%19%19%10%2
2664
11th to 20thNight
49%6%17%21%6%
3507
21st to endNight
43%7%17%18%13%2
5072

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
8%11%26%31%20%5%
180
11th to 20thDay
9%7%19%34%22%10%
164
21st to endDay
8%5%21%41%20%5%
222
February1st to 10thDay
5%9%38%35%12%2
240
11th to 20thDay
5%9%31%38%14%4
333
21st to endDay
412%33%35%14%2
346
March1st to 10thDay
6%7%34%37%15%1
420
11th to 20thDay
7%11%20%36%23%3
420
21st to endDay
10%10%27%37%14%2
462
April1st to 10thDay
8%13%27%31%19%3
420
11th to 20thDay
8%16%36%24%12%4
412
21st to endDay
11%11%27%28%19%4
420
May1st to 10thDay
7%11%27%32%20%4
423
11th to 20thDay
14%10%23%27%21%5%
448
21st to endDay
12%8%23%27%20%11%
485
June1st to 10thDay
6%11%23%28%24%9%
625
11th to 20thDay
8%14%27%30%17%5%
630
21st to endDay
26%24%36%26%5%
598
July1st to 10thDay
27%30%32%23%6%
446
11th to 20thDay
26%29%40%19%4
444
21st to endDay
5%425%33%27%6%
487
August1st to 10thDay
6%6%25%34%24%5%
447
11th to 20thDay
45%22%30%29%10%
437
21st to endDay
28%26%30%27%7%
495
September1st to 10thDay
37%24%27%30%10%
450
11th to 20thDay
6%8%22%29%24%10%
450
21st to endDay
7%10%21%28%27%8%
450
October1st to 10thDay
9%7%20%31%27%6%
414
11th to 20thDay
313%20%28%25%10%
270
21st to endDay
8%11%25%35%18%3
297
November1st to 10thDay
8%16%25%30%19%3
270
11th to 20thDay
39%24%36%21%6%
270
21st to endDay
8%5%29%36%20%3
270
December1st to 10thDay
6%10%27%33%18%5%
266
11th to 20thDay
7%7%23%40%21%2
180
21st to endDay
10%7%22%36%21%5%
198
January1st to 10thNight
8%5%24%40%20%4
760
11th to 20thNight
6%6%22%40%20%6%
728
21st to endNight
10%321%42%20%5%
792
February1st to 10thNight
5%5%33%39%15%2
720
11th to 20thNight
9%429%40%16%2
704
21st to endNight
6%7%30%36%19%2
592
March1st to 10thNight
5%6%27%44%15%3
720
11th to 20thNight
6%6%25%43%18%3
720
21st to endNight
8%7%28%39%15%2
792
April1st to 10thNight
9%6%25%40%19%2
720
11th to 20thNight
8%6%34%37%13%2
556
21st to endNight
7%5%26%41%18%3
540
May1st to 10thNight
6%7%28%37%19%2
540
11th to 20thNight
8%423%35%26%3
531
21st to endNight
14%6%22%32%22%4
514
June1st to 10thNight
5%5%17%43%26%4
360
11th to 20thNight
7%5%23%46%17%2
360
21st to endNight
3119%46%27%3
360
July1st to 10thNight
1113%51%30%3
350
11th to 20thNight
1110%64%24%
348
21st to endNight
2113%48%34%3
486
August1st to 10thNight
5%413%48%29%1
537
11th to 20thNight
2213%47%33%3
534
21st to endNight
4215%48%28%4
606
September1st to 10thNight
416%42%31%6%
720
11th to 20thNight
6%313%37%33%8%
720
21st to endNight
8%318%35%28%9%
720
October1st to 10thNight
9%416%40%28%3
720
11th to 20thNight
6%420%40%25%5%
720
21st to endNight
5%5%25%41%19%4
792
November1st to 10thNight
8%5%23%39%22%3
740
11th to 20thNight
45%31%41%17%2
760
21st to endNight
6%5%23%43%18%4
904
December1st to 10thNight
6%6%25%45%15%2
950
11th to 20thNight
9%8%23%43%15%2
950
21st to endNight
11%6%29%40%12%2
955
Page generated at 2024-01-09 23:25:05. Version ac07

Copyright 2024 Attilla Danko


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