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 2005-11-05 to 2017-09-18.

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
60%
15254
21%
46861
18%
15219
64%
15219
33%
27505

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 15thNight
55%
716
11%
2506
11%
716
58%
716
17%
1737
January16th to endNight
58%
768
16%
2617
15%
768
62%
768
23%
1694
February1st to 15thNight
52%
700
11%
2283
10%
696
56%
696
23%
1508
February16th to endNight
48%
632
16%
1895
12%
632
54%
632
26%
1234
March1st to 15thNight
56%
720
15%
2079
13%
720
60%
720
30%
1333
March16th to endNight
49%
768
18%
2112
12%
768
54%
768
30%
1347
April1st to 15thNight
50%
674
20%
1795
11%
674
55%
674
33%
1134
April16th to endNight
56%
540
25%
1620
18%
540
60%
540
35%
940
May1st to 15thNight
55%
539
21%
1619
17%
539
59%
539
39%
894
May16th to endNight
57%
515
17%
1637
17%
514
59%
514
30%
964
June1st to 15thNight
66%
360
19%
1260
22%
360
71%
360
33%
684
June16th to endNight
71%
360
30%
1277
36%
360
79%
360
55%
523
July1st to 15thNight
84%
340
23%
1360
34%
340
89%
340
51%
541
July16th to endNight
81%
437
31%
1472
37%
410
84%
410
55%
609
August1st to 15thNight
74%
539
29%
1611
25%
536
77%
536
51%
795
August16th to endNight
74%
582
38%
1728
29%
582
77%
582
54%
835
September1st to 15thNight
76%
720
31%
1923
22%
720
80%
720
56%
988
September16th to endNight
70%
667
35%
1847
28%
667
74%
667
49%
981
October1st to 15thNight
65%
660
29%
1892
23%
660
69%
660
43%
1038
October16th to endNight
65%
704
26%
2217
23%
704
70%
704
38%
1205
November1st to 15thNight
57%
700
22%
2275
22%
700
61%
700
32%
1304
November16th to endNight
60%
810
19%
2430
14%
810
66%
810
32%
1479
December1st to 15thNight
50%
900
11%
2583
7%
900
54%
900
25%
1764
December16th to endNight
48%
903
13%
2823
9%
903
53%
903
19%
1974

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
4425%4345%6%8%51%
47934
Night
35%245%35%5%6%8%49%
47040
TransparencyDay
31%5%12%22%18%9%
47611
Night
32%6%13%23%16%8%
46863
SeeingDay
7%9%27%30%19%5%
5602
Night
7%320%40%23%4
15264

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 15thDay
36%38%7%36%6%7%11%35%
1432
16th to endDay
310%38%5%36%6%6%9%33%
1605
February1st to 15thDay
1446%5%36%8%8%10%37%
1578
16th to endDay
37%47%7%36%6%6%9%38%
1579
March1st to 15thDay
25%25%6%47%7%7%9%40%
1880
16th to endDay
5%5%36%6%46%7%7%11%37%
2112
April1st to 15thDay
46%36%6%35%5%7%8%42%
2151
16th to endDay
6%6%25%5%35%5%6%8%45%
2340
May1st to 15thDay
44245%35%46%7%49%
2331
16th to endDay
8%6%36%6%35%5%7%8%39%
2474
June1st to 15thDay
5%426%5%445%6%8%45%
2697
16th to endDay
1112213346%71%
2679
July1st to 15thDay
21121336%7%67%
2520
16th to endDay
3212213436%68%
2594
August1st to 15thDay
222324446%65%
2340
16th to endDay
21221235%6%70%
2473
September1st to 15thDay
3212313346%67%
2037
16th to endDay
4312312347%64%
1838
October1st to 15thDay
7%5%244245%46%52%
1738
16th to endDay
23245%345%6%8%53%
1653
November1st to 15thDay
46%25%446%46%8%46%
1584
16th to endDay
25%25%5%36%6%7%9%45%
1515
December1st to 15thDay
36%49%7%46%6%5%7%36%
1374
16th to endDay
6%9%47%5%45%7%6%9%33%
1410
January1st to 15thNight
37%47%6%47%6%8%9%35%
2506
16th to endNight
410%36%4345%6%9%39%
2617
February1st to 15thNight
35%36%6%46%8%8%10%36%
2272
16th to endNight
38%36%5%36%5%6%10%39%
1895
March1st to 15thNight
24246%47%6%7%9%43%
2079
16th to endNight
46%246%35%5%6%8%45%
2112
April1st to 15thNight
5%7%35%42446%9%44%
1795
16th to endNight
4425%44445%7%52%
1620
May1st to 15thNight
35%244245%5%8%52%
1619
16th to endNight
8%5%345%245%7%8%43%
1637
June1st to 15thNight
5%2145%36%5%5%9%49%
1260
16th to endNight
1112322436%70%
1277
July1st to 15thNight
111121445%8%66%
1440
16th to endNight
211231334472%
1573
August1st to 15thNight
22343335%7%63%
1620
16th to endNight
1213313345%68%
1728
September1st to 15thNight
3213213445%68%
1923
16th to endNight
5%213323345%63%
1847
October1st to 15thNight
6%413423448%56%
1892
16th to endNight
431443446%9%53%
2217
November1st to 15thNight
3426%5%345%5%8%50%
2275
16th to endNight
22246%36%6%7%10%47%
2430
December1st to 15thNight
27%37%7%35%6%7%9%38%
2583
16th to endNight
5%11%46%6%36%5%7%8%34%
2823

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 15thDay
43%10%19%18%6%1
1432
16th to endDay
47%10%15%17%5%2
1605
February1st to 15thDay
38%10%23%21%5%
1578
16th to endDay
40%8%19%23%6%1
1579
March1st to 15thDay
38%9%20%23%7%
1880
16th to endDay
40%8%18%22%9%
2112
April1st to 15thDay
37%6%17%23%13%1
2151
16th to endDay
35%312%28%19%
2340
May1st to 15thDay
30%39%33%20%2
2331
16th to endDay
39%412%26%15%2
2477
June1st to 15thDay
34%411%24%19%5%
2697
16th to endDay
15%25%18%38%20%
2679
July1st to 15thDay
15%2317%32%29%
2371
16th to endDay
17%2313%21%43%
2432
August1st to 15thDay
19%2416%30%26%
2325
16th to endDay
15%2423%32%22%
2473
September1st to 15thDay
18%27%19%35%16%
2037
16th to endDay
21%210%30%25%9%
1838
October1st to 15thDay
31%417%28%15%3
1738
16th to endDay
27%6%19%28%17%
1653
November1st to 15thDay
36%6%19%23%12%1
1584
16th to endDay
34%8%23%23%8%2
1515
December1st to 15thDay
47%9%18%19%3
1374
16th to endDay
49%8%19%15%6%1
1410
January1st to 15thNight
44%11%16%18%6%1
2506
16th to endNight
42%6%16%21%9%2
2617
February1st to 15thNight
41%9%19%22%6%
2283
16th to endNight
40%6%20%23%6%1
1895
March1st to 15thNight
35%9%18%25%9%1
2079
16th to endNight
35%8%16%28%9%1
2112
April1st to 15thNight
36%414%26%15%2
1795
16th to endNight
32%5%9%30%21%1
1620
May1st to 15thNight
28%38%33%22%2
1620
16th to endNight
36%311%28%16%3
1638
June1st to 15thNight
30%410%23%23%6%
1260
16th to endNight
15%2415%35%26%
1277
July1st to 15thNight
16%3417%29%28%
1360
16th to endNight
16%2210%20%48%
1472
August1st to 15thNight
20%3417%21%32%
1611
16th to endNight
18%2415%28%30%
1728
September1st to 15thNight
18%35%13%34%23%
1923
16th to endNight
23%35%27%28%12%
1847
October1st to 15thNight
27%313%31%19%4
1892
16th to endNight
27%5%12%31%21%1
2217
November1st to 15thNight
32%5%16%24%16%3
2275
16th to endNight
32%8%20%24%11%3
2430
December1st to 15thNight
40%10%23%18%6%
2583
16th to endNight
48%7%17%18%6%1
2823

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 15thDay
11%320%33%16%15%
60
16th to endDay
14%6%12%32%24%10%
75
February1st to 15thDay
5%5%36%15%27%9%
93
16th to endDay
7%12%28%36%12%2
238
March1st to 15thDay
5%11%32%29%18%2
270
16th to endDay
10%16%32%31%8%
288
April1st to 15thDay
6%19%27%24%17%4
269
16th to endDay
15%14%34%21%11%2
270
May1st to 15thDay
9%9%32%30%14%3
288
16th to endDay
13%10%21%25%20%8%
330
June1st to 15thDay
8%12%21%30%22%4
492
16th to endDay
29%26%30%25%5%
474
July1st to 15thDay
36%29%35%17%7%
305
16th to endDay
46%33%34%16%4
327
August1st to 15thDay
5%5%31%33%19%5%
315
16th to endDay
16%28%30%23%9%
332
September1st to 15thDay
6%7%24%28%20%12%
315
16th to endDay
7%7%25%25%25%8%
264
October1st to 15thDay
10%9%26%27%20%5%
178
16th to endDay
8%7%22%37%18%5%
96
November1st to 15thDay
11%46%30%40%7%
90
16th to endDay
8%5%36%34%13%1
90
December1st to 15thDay
7%12%43%30%5%1
79
16th to endDay
12%310%43%23%6%
64
January1st to 15thNight
7%419%40%22%5%
720
16th to endNight
10%416%38%23%6%
768
February1st to 15thNight
7%424%39%21%3
704
16th to endNight
8%5%27%37%19%2
632
March1st to 15thNight
4424%41%20%3
720
16th to endNight
8%7%28%37%16%1
768
April1st to 15thNight
10%5%25%36%19%2
674
16th to endNight
7%427%42%15%2
540
May1st to 15thNight
6%5%28%33%23%2
540
16th to endNight
11%5%18%36%23%4
516
June1st to 15thNight
6%416%46%22%3
360
16th to endNight
3119%44%27%3
360
July1st to 15thNight
118%50%36%2
340
16th to endNight
111%48%34%3
437
August1st to 15thNight
4112%45%33%2
539
16th to endNight
3212%43%32%5%
582
September1st to 15thNight
413%35%36%10%
720
16th to endNight
7%213%31%32%12%
667
October1st to 15thNight
8%316%38%27%5%
660
16th to endNight
6%219%41%23%6%
704
November1st to 15thNight
6%423%38%25%3
700
16th to endNight
4323%43%19%4
810
December1st to 15thNight
7%5%25%43%16%2
900
16th to endNight
12%5%22%42%14%3
903
Page generated at 2017-09-19 05:32:24. Version ac04

Copyright 2017 A. Danko


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