Moabi Regional Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Moabi Regional Park clear sky chart from 2005-11-05 to 2017-09-22.

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%
15907
38%
46998
28%
15869
76%
15869
53%
21019

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
57%
718
34%
2327
27%
716
70%
716
41%
1075
January16th to endNight
55%
768
37%
2463
26%
768
71%
768
39%
1176
February1st to 15thNight
58%
700
39%
2112
29%
700
73%
700
48%
966
February16th to endNight
55%
632
36%
1895
29%
632
69%
632
41%
943
March1st to 15thNight
58%
720
38%
2076
28%
720
71%
720
50%
954
March16th to endNight
64%
768
39%
2112
26%
768
76%
768
54%
991
April1st to 15thNight
56%
719
35%
1871
18%
719
65%
719
52%
926
April16th to endNight
59%
621
45%
1701
22%
621
73%
621
64%
708
May1st to 15thNight
61%
539
40%
1619
24%
539
72%
539
60%
647
May16th to endNight
60%
561
39%
1685
22%
561
72%
561
59%
677
June1st to 15thNight
71%
540
35%
1620
25%
540
78%
540
66%
616
June16th to endNight
75%
540
36%
1620
26%
540
82%
540
69%
619
July1st to 15thNight
78%
510
28%
1530
24%
510
79%
510
51%
710
July16th to endNight
71%
564
32%
1593
23%
531
80%
531
45%
790
August1st to 15thNight
81%
568
37%
1640
26%
565
83%
565
59%
732
August16th to endNight
81%
764
41%
1910
25%
764
85%
764
59%
969
September1st to 15thNight
82%
720
36%
1950
29%
720
85%
720
60%
897
September16th to endNight
79%
683
48%
1890
34%
683
89%
683
74%
763
October1st to 15thNight
73%
660
44%
1815
35%
660
80%
660
65%
807
October16th to endNight
75%
704
45%
2118
36%
704
87%
704
64%
870
November1st to 15thNight
70%
700
39%
2275
36%
700
80%
700
56%
927
November16th to endNight
63%
720
42%
2340
34%
720
78%
720
53%
960
December1st to 15thNight
58%
720
37%
2340
30%
720
70%
720
41%
1081
December16th to endNight
53%
768
38%
2496
26%
768
69%
768
38%
1215

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
211212235%75%
47883
Night
211212235%74%
47193
TransparencyDay
13%2411%25%43%
47578
Night
14%2410%25%43%
46999
SeeingDay
313%16%32%25%8%
5662
Night
315%11%33%32%4
15916

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
3112222236%69%
1611
16th to endDay
5%22313235%67%
1758
February1st to 15thDay
3211113336%70%
1751
16th to endDay
5%212323347%64%
1579
March1st to 15thDay
211212137%74%
1884
16th to endDay
111213345%74%
2112
April1st to 15thDay
212212245%72%
2074
16th to endDay
1111212483%
2258
May1st to 15thDay
1111122482%
2331
16th to endDay
1111112382%
2429
June1st to 15thDay
1111386%
2340
16th to endDay
11112287%
2340
July1st to 15thDay
2112223246%71%
2340
16th to endDay
322222445%8%61%
2467
August1st to 15thDay
111213346%71%
2309
16th to endDay
21221234474%
2292
September1st to 15thDay
1112213246%72%
2009
16th to endDay
111112386%
1882
October1st to 15thDay
11121233476%
1815
16th to endDay
11111225%80%
1750
November1st to 15thDay
211111224378%
1584
16th to endDay
211211235%77%
1620
December1st to 15thDay
3313213247%66%
1620
16th to endDay
6%313212348%62%
1728
January1st to 15thNight
323322345%68%
2327
16th to endNight
5%213213335%66%
2463
February1st to 15thNight
3111212235%72%
2101
16th to endNight
5%312313346%64%
1895
March1st to 15thNight
212212347%70%
2076
16th to endNight
11212346%73%
2112
April1st to 15thNight
211212335%74%
1871
16th to endNight
11122483%
1701
May1st to 15thNight
1121123481%
1619
16th to endNight
1111113481%
1684
June1st to 15thNight
11125%84%
1620
16th to endNight
11112286%
1620
July1st to 15thNight
12223436%70%
1620
16th to endNight
221332445%9%58%
1701
August1st to 15thNight
1211212347%72%
1649
16th to endNight
111312346%72%
1910
September1st to 15thNight
1111235%6%74%
1950
16th to endNight
11111287%
1890
October1st to 15thNight
2111233477%
1815
16th to endNight
1111122382%
2118
November1st to 15thNight
11111223478%
2275
16th to endNight
311211125%78%
2340
December1st to 15thNight
4112312336%66%
2340
16th to endNight
6%312213236%65%
2496

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
17%2418%33%22%
1612
16th to endDay
21%26%17%32%20%
1758
February1st to 15thDay
17%16%15%28%30%
1751
16th to endDay
21%35%13%31%24%
1579
March1st to 15thDay
13%1312%30%38%
1884
16th to endDay
14%2413%33%32%
2112
April1st to 15thDay
15%139%29%40%
2074
16th to endDay
7%129%28%50%
2258
May1st to 15thDay
7%139%25%52%
2331
16th to endDay
10%127%22%56%
2432
June1st to 15thDay
7%1314%72%
2340
16th to endDay
5%1137%80%
2340
July1st to 15thDay
15%247%16%53%
2201
16th to endDay
19%49%15%23%27%
2312
August1st to 15thDay
13%35%10%22%43%
2294
16th to endDay
14%349%24%43%
2292
September1st to 15thDay
14%36%9%21%44%
2009
16th to endDay
7%12421%64%
1882
October1st to 15thDay
12%247%24%48%
1815
16th to endDay
9%249%25%49%
1750
November1st to 15thDay
12%2312%31%38%
1584
16th to endDay
11%2414%32%35%
1620
December1st to 15thDay
20%26%23%27%19%
1620
16th to endDay
23%38%22%26%15%
1728
January1st to 15thNight
19%35%14%31%26%
2327
16th to endNight
22%25%15%25%29%
2463
February1st to 15thNight
15%35%15%26%34%
2112
16th to endNight
22%25%11%29%29%
1895
March1st to 15thNight
14%25%9%30%37%
2076
16th to endNight
14%2412%29%37%
2112
April1st to 15thNight
15%238%29%40%
1871
16th to endNight
7%129%26%53%
1701
May1st to 15thNight
8%138%27%51%
1620
16th to endNight
8%127%22%57%
1685
June1st to 15thNight
6%12414%71%
1620
16th to endNight
6%128%80%
1620
July1st to 15thNight
15%348%14%52%
1530
16th to endNight
20%37%16%22%28%
1593
August1st to 15thNight
12%249%24%45%
1640
16th to endNight
14%239%22%46%
1910
September1st to 15thNight
12%3413%22%43%
1950
16th to endNight
6%12318%68%
1890
October1st to 15thNight
11%147%26%48%
1815
16th to endNight
9%248%20%55%
2118
November1st to 15thNight
11%239%28%44%
2275
16th to endNight
13%139%31%41%
2340
December1st to 15thNight
19%25%15%30%26%
2340
16th to endNight
22%26%20%29%17%
2496

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
17%221%41%17%
90
16th to endDay
5%10%19%26%30%7%
126
February1st to 15thDay
419%18%30%19%7%
266
16th to endDay
7%22%26%20%19%3
238
March1st to 15thDay
321%17%33%18%5%
270
16th to endDay
322%15%31%20%6%
288
April1st to 15thDay
421%25%26%12%8%
269
16th to endDay
226%29%22%15%2
270
May1st to 15thDay
120%23%30%17%6%
288
16th to endDay
115%27%33%17%4
330
June1st to 15thDay
113%15%39%23%6%
315
16th to endDay
10%11%38%24%13%
315
July1st to 15thDay
27%6%39%30%13%
305
16th to endDay
210%330%41%11%
327
August1st to 15thDay
16%11%38%29%11%
315
16th to endDay
246%34%35%17%
332
September1st to 15thDay
15%12%38%31%10%
315
16th to endDay
311%12%32%30%11%
280
October1st to 15thDay
13%22%29%28%5%
255
16th to endDay
25%9%24%48%8%
102
November1st to 15thDay
3412%25%40%14%
90
16th to endDay
16%25%41%24%1
90
December1st to 15thDay
2314%30%44%5%
90
16th to endDay
11%419%39%22%2
96
January1st to 15thNight
418%14%37%22%2
720
16th to endNight
5%18%15%36%21%2
768
February1st to 15thNight
318%16%38%20%2
704
16th to endNight
7%17%15%39%17%2
632
March1st to 15thNight
319%15%34%25%1
720
16th to endNight
119%11%37%27%2
768
April1st to 15thNight
220%17%34%21%2
719
16th to endNight
119%17%37%21%1
621
May1st to 15thNight
219%15%34%26%1
540
16th to endNight
119%15%37%24%1
563
June1st to 15thNight
17%8%40%30%1
540
16th to endNight
17%5%33%40%2
540
July1st to 15thNight
211%325%50%5%
510
16th to endNight
316%216%55%4
564
August1st to 15thNight
29%220%59%5%
568
16th to endNight
28%318%55%11%
764
September1st to 15thNight
28%424%50%9%
720
16th to endNight
19%7%30%42%7%
683
October1st to 15thNight
110%11%39%33%3
660
16th to endNight
210%9%34%37%6%
704
November1st to 15thNight
115%10%36%30%6%
700
16th to endNight
317%11%31%30%5%
720
December1st to 15thNight
5%18%12%36%25%1
720
16th to endNight
8%19%14%37%17%2
768
Page generated at 2017-09-23 03:43:39. Version ac04

Copyright 2017 A. Danko


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