Gila Cliff Dwellings National Monument
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Gila Cliff Dwellings National Monument clear sky chart from 2005-11-05 to 2017-09-24.

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
64%
15284
33%
46941
24%
15243
73%
15243
47%
23025

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
61%
718
32%
2327
28%
716
71%
716
48%
1102
January16th to endNight
57%
768
36%
2496
29%
768
70%
768
43%
1214
February1st to 15thNight
58%
701
33%
2276
26%
699
71%
699
51%
1021
February16th to endNight
46%
632
40%
1810
23%
632
65%
632
48%
897
March1st to 15thNight
52%
720
39%
1980
22%
720
66%
720
51%
984
March16th to endNight
54%
768
38%
2112
19%
768
69%
768
54%
1014
April1st to 15thNight
46%
575
35%
1834
16%
575
68%
575
47%
805
April16th to endNight
48%
540
42%
1800
24%
540
73%
540
57%
691
May1st to 15thNight
54%
539
32%
1756
23%
539
67%
539
53%
759
May16th to endNight
58%
562
35%
1684
22%
561
71%
561
56%
762
June1st to 15thNight
69%
540
29%
1620
24%
540
74%
540
55%
750
June16th to endNight
76%
540
23%
1620
21%
540
77%
540
46%
818
July1st to 15thNight
76%
510
17%
1530
16%
510
76%
510
31%
941
July16th to endNight
77%
564
13%
1593
12%
531
77%
531
29%
997
August1st to 15thNight
80%
539
17%
1656
17%
536
80%
536
30%
995
August16th to endNight
81%
573
22%
1910
25%
573
81%
573
29%
1135
September1st to 15thNight
74%
540
23%
1800
25%
540
75%
540
28%
1093
September16th to endNight
77%
683
36%
1934
27%
683
82%
683
58%
932
October1st to 15thNight
73%
660
37%
1980
27%
660
79%
660
55%
923
October16th to endNight
78%
704
43%
2112
31%
704
87%
704
70%
868
November1st to 15thNight
71%
700
42%
2100
30%
700
80%
700
63%
911
November16th to endNight
64%
720
41%
2175
30%
720
73%
720
51%
1019
December1st to 15thNight
60%
720
36%
2340
28%
720
71%
720
47%
1098
December16th to endNight
52%
768
31%
2496
25%
768
62%
768
39%
1296

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
4313424447%58%
47987
Night
221232345%7%64%
47139
TransparencyDay
25%48%15%27%18%
47682
Night
19%49%19%29%17%
46945
SeeingDay
10%15%25%26%16%5%
5189
Night
5%6%18%37%27%5%
15291

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
342223346%64%
1611
16th to endDay
4413323346%62%
1728
February1st to 15thDay
2412322235%70%
1584
16th to endDay
241211235%7%67%
1663
March1st to 15thDay
2323313347%63%
1980
16th to endDay
2211213337%70%
2112
April1st to 15thDay
1212323345%70%
2114
16th to endDay
122313236%72%
2160
May1st to 15thDay
1112323337%68%
2192
16th to endDay
222224435%68%
2429
June1st to 15thDay
2112314446%68%
2340
16th to endDay
2324435%5%5%6%56%
2340
July1st to 15thDay
6%5%26%6%48%8%7%10%33%
2340
16th to endDay
8%6%37%7%5%8%7%7%10%25%
2467
August1st to 15thDay
8%5%37%8%5%7%6%7%8%31%
2295
16th to endDay
7%427%8%5%7%5%5%8%36%
2292
September1st to 15thDay
9%5%27%7%35%6%5%8%37%
2160
16th to endDay
4213423346%61%
1880
October1st to 15thDay
4112223347%65%
1650
16th to endDay
211222325%73%
1760
November1st to 15thDay
121121222475%
1759
16th to endDay
231321333469%
1783
December1st to 15thDay
4312312336%66%
1620
16th to endDay
35%24312336%61%
1728
January1st to 15thNight
3413213247%66%
2327
16th to endNight
4312313346%64%
2496
February1st to 15thNight
221221335%6%69%
2267
16th to endNight
1222235%45%69%
1810
March1st to 15thNight
2212312246%69%
1980
16th to endNight
222212245%73%
2112
April1st to 15thNight
111221335%6%69%
1834
16th to endNight
1112235%79%
1800
May1st to 15thNight
1212213236%72%
1756
16th to endNight
212212345%72%
1684
June1st to 15thNight
2112313345%69%
1620
16th to endNight
11133345%6%9%57%
1620
July1st to 15thNight
3324436%7%8%13%40%
1620
16th to endNight
34246%37%6%9%13%38%
1701
August1st to 15thNight
33245%36%6%8%12%43%
1665
16th to endNight
42145%36%7%10%10%41%
1910
September1st to 15thNight
5%425%5%36%6%7%7%44%
1800
16th to endNight
322212445%69%
1934
October1st to 15thNight
2111212345%72%
1980
16th to endNight
1111123480%
2112
November1st to 15thNight
111212235%76%
2100
16th to endNight
3212212336%69%
2175
December1st to 15thNight
5%412212245%67%
2340
16th to endNight
35%13324447%58%
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
22%27%16%33%17%
1612
16th to endDay
25%25%17%33%15%
1728
February1st to 15thDay
19%17%17%30%23%
1584
16th to endDay
18%25%19%36%17%
1663
March1st to 15thDay
20%35%14%37%19%
1980
16th to endDay
15%2417%37%21%
2112
April1st to 15thDay
17%25%16%38%20%
2114
16th to endDay
14%2413%37%28%
2160
May1st to 15thDay
15%36%14%33%24%
2192
16th to endDay
18%45%11%31%29%
2432
June1st to 15thDay
16%4410%27%36%
2340
16th to endDay
25%5%9%11%19%28%
2340
July1st to 15thDay
40%10%16%13%9%10%
2201
16th to endDay
48%12%20%13%3
2312
August1st to 15thDay
46%10%13%15%11%2
2280
16th to endDay
43%9%12%15%13%5%
2292
September1st to 15thDay
42%7%10%17%14%7%
2160
16th to endDay
23%36%19%30%15%
1880
October1st to 15thDay
20%27%15%34%19%
1650
16th to endDay
14%25%16%35%25%
1760
November1st to 15thDay
14%25%19%34%23%
1759
16th to endDay
20%25%15%34%22%
1783
December1st to 15thDay
20%28%21%31%14%
1620
16th to endDay
25%311%21%30%8%
1728
January1st to 15thNight
20%27%18%34%14%
2327
16th to endNight
22%26%18%35%12%
2496
February1st to 15thNight
16%38%20%29%20%
2278
16th to endNight
17%45%21%34%15%
1810
March1st to 15thNight
17%36%17%37%17%
1980
16th to endNight
15%25%17%40%19%
2112
April1st to 15thNight
15%36%20%38%16%
1834
16th to endNight
9%2416%41%25%
1800
May1st to 15thNight
14%37%14%36%23%
1757
16th to endNight
14%37%16%29%28%
1685
June1st to 15thNight
16%35%12%27%35%
1620
16th to endNight
21%5%10%12%22%27%
1620
July1st to 15thNight
30%11%16%19%11%9%
1530
16th to endNight
33%10%30%20%4
1593
August1st to 15thNight
30%11%23%18%13%2
1656
16th to endNight
30%10%19%19%14%5%
1910
September1st to 15thNight
34%9%16%18%14%7%
1800
16th to endNight
16%38%22%34%14%
1934
October1st to 15thNight
15%48%18%33%19%
1980
16th to endNight
9%15%22%34%25%
2112
November1st to 15thNight
11%35%22%34%22%
2100
16th to endNight
19%16%17%31%24%
2175
December1st to 15thNight
20%28%23%30%14%
2340
16th to endNight
25%412%21%27%8%
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
21%13%26%24%11%3
90
16th to endDay
7%14%29%27%14%7%
96
February1st to 15thDay
6%6%23%33%21%8%
90
16th to endDay
10%39%23%14%9%2
164
March1st to 15thDay
13%22%36%17%8%1
270
16th to endDay
15%30%30%15%5%2
288
April1st to 15thDay
13%29%34%15%5%1
269
16th to endDay
16%31%32%13%31
270
May1st to 15thDay
10%27%36%18%42
288
16th to endDay
422%42%20%7%2
330
June1st to 15thDay
316%35%28%11%3
315
16th to endDay
45%27%32%22%7%
315
July1st to 15thDay
9%310%39%28%8%
305
16th to endDay
10%5%5%27%33%17%
327
August1st to 15thDay
10%48%34%28%12%
315
16th to endDay
8%310%38%28%10%
332
September1st to 15thDay
15%218%38%19%6%
315
16th to endDay
9%8%32%32%13%3
258
October1st to 15thDay
48%27%32%17%8%
90
16th to endDay
6%5%21%34%23%8%
96
November1st to 15thDay
6%17%16%28%24%5%
90
16th to endDay
16%13%32%20%16%1
90
December1st to 15thDay
6%13%31%23%20%5%
90
16th to endDay
18%15%19%35%8%2
96
January1st to 15thNight
6%5%22%39%19%6%
720
16th to endNight
7%7%22%39%17%4
768
February1st to 15thNight
48%25%38%18%4
704
16th to endNight
412%34%36%10%
632
March1st to 15thNight
5%13%25%36%18%1
720
16th to endNight
5%10%26%40%15%1
768
April1st to 15thNight
416%29%36%12%
575
16th to endNight
314%32%35%12%1
540
May1st to 15thNight
38%29%43%14%
540
16th to endNight
46%27%41%19%1
563
June1st to 15thNight
2220%50%23%1
540
16th to endNight
2110%41%39%3
540
July1st to 15thNight
4228%52%10%
510
16th to endNight
5%1218%60%12%
564
August1st to 15thNight
3115%61%17%
539
16th to endNight
41121%58%12%
573
September1st to 15thNight
7%431%49%6%
540
16th to endNight
4110%38%39%5%
683
October1st to 15thNight
3414%47%25%4
660
16th to endNight
2213%45%29%6%
704
November1st to 15thNight
2418%41%27%5%
700
16th to endNight
6%6%18%36%23%7%
720
December1st to 15thNight
8%8%19%38%21%3
720
16th to endNight
8%7%27%39%13%3
768
Page generated at 2017-09-25 07:02:18. Version ac04

Copyright 2017 A. Danko


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