Picacho Peak State Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Picacho Peak State Park clear sky chart from 2005-11-05 to 2018-01-12.

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
79%
16087
38%
48344
34%
16049
82%
16049
57%
22405

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
78%
762
34%
2471
37%
760
80%
760
51%
1136
January16th to endNight
72%
768
37%
2496
38%
768
77%
768
46%
1227
February1st to 15thNight
75%
700
38%
2186
38%
700
81%
700
54%
1010
February16th to endNight
68%
632
38%
1859
36%
632
74%
632
49%
935
March1st to 15thNight
72%
720
40%
1980
33%
720
79%
720
60%
959
March16th to endNight
77%
768
41%
2112
32%
768
84%
768
65%
976
April1st to 15thNight
71%
701
35%
1960
24%
701
79%
701
59%
934
April16th to endNight
74%
540
47%
1745
41%
540
82%
540
73%
648
May1st to 15thNight
77%
539
42%
1619
34%
539
83%
539
73%
645
May16th to endNight
78%
561
42%
1684
35%
561
81%
561
73%
668
June1st to 15thNight
83%
540
36%
1620
30%
540
85%
540
70%
670
June16th to endNight
89%
540
33%
1620
29%
540
89%
540
69%
683
July1st to 15thNight
83%
510
24%
1530
20%
510
83%
510
45%
805
July16th to endNight
84%
564
25%
1593
22%
531
83%
531
38%
912
August1st to 15thNight
87%
539
29%
1611
26%
536
87%
536
48%
816
August16th to endNight
85%
627
35%
1881
33%
627
85%
627
47%
960
September1st to 15thNight
78%
720
31%
1980
27%
720
80%
720
47%
1097
September16th to endNight
86%
716
46%
1980
38%
716
89%
716
71%
875
October1st to 15thNight
82%
720
41%
2074
34%
720
85%
720
69%
892
October16th to endNight
85%
768
47%
2304
43%
768
90%
768
71%
956
November1st to 15thNight
83%
760
43%
2280
39%
760
86%
760
65%
986
November16th to endNight
79%
780
42%
2520
43%
780
83%
780
56%
1112
December1st to 15thNight
75%
780
38%
2535
40%
780
78%
780
50%
1174
December16th to endNight
73%
832
38%
2704
41%
832
76%
832
45%
1329

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
3212213346%68%
48992
Night
3212213346%68%
48541
TransparencyDay
18%2311%24%40%
48687
Night
17%1312%24%39%
48347
SeeingDay
4415%30%30%14%
5812
Night
419%41%37%5%
16096

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
4213314335%65%
1710
16th to endDay
6%212223245%65%
1728
February1st to 15thDay
5%212213345%67%
1674
16th to endDay
6%213213337%63%
1615
March1st to 15thDay
422213335%69%
1980
16th to endDay
2212212235%73%
2112
April1st to 15thDay
212212336%73%
1988
16th to endDay
11111122482%
2212
May1st to 15thDay
111111235%80%
2331
16th to endDay
1111111284%
2429
June1st to 15thDay
11111112481%
2340
16th to endDay
211111223377%
2340
July1st to 15thDay
32145%35%5%6%8%52%
2340
16th to endDay
4326%5%46%5%8%10%39%
2467
August1st to 15thDay
4315%5%25%5%6%8%50%
2340
16th to endDay
3213435%5%6%8%55%
2318
September1st to 15thDay
321432445%7%58%
1980
16th to endDay
311121122378%
1980
October1st to 15thDay
11211123477%
1884
16th to endDay
1211223479%
1920
November1st to 15thDay
1211112235%76%
1909
16th to endDay
4213212235%72%
1768
December1st to 15thDay
6%312322346%63%
1755
16th to endDay
5%21331335%6%62%
1872
January1st to 15thNight
5%213313246%66%
2471
16th to endNight
7%313213346%62%
2496
February1st to 15thNight
5%212212246%68%
2176
16th to endNight
5%312324445%62%
1859
March1st to 15thNight
4212113235%70%
1980
16th to endNight
211212225%75%
2112
April1st to 15thNight
321221334471%
1960
16th to endNight
21111286%
1745
May1st to 15thNight
1111236%78%
1619
16th to endNight
11111111285%
1684
June1st to 15thNight
1211223480%
1620
16th to endNight
1121223478%
1620
July1st to 15thNight
22133346%8%11%50%
1620
16th to endNight
32145%36%7%9%14%40%
1701
August1st to 15thNight
223435%6%7%8%55%
1620
16th to endNight
22135%35%5%6%9%55%
1881
September1st to 15thNight
32244245%6%8%55%
1980
16th to endNight
1112223479%
1980
October1st to 15thNight
21211223477%
2074
16th to endNight
1111122481%
2304
November1st to 15thNight
212212236%75%
2280
16th to endNight
4212313335%70%
2520
December1st to 15thNight
7%21321225%6%64%
2535
16th to endNight
6%324312335%62%
2704

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
21%1315%28%30%
1711
16th to endDay
22%1116%27%31%
1728
February1st to 15thDay
19%1213%27%34%
1674
16th to endDay
23%1113%32%27%
1615
March1st to 15thDay
18%115%30%43%
1980
16th to endDay
15%27%28%45%
2112
April1st to 15thDay
13%1435%44%
1988
16th to endDay
9%15%22%60%
2212
May1st to 15thDay
8%16%21%61%
2331
16th to endDay
9%1422%61%
2432
June1st to 15thDay
10%215%71%
2340
16th to endDay
12%11312%67%
2340
July1st to 15thDay
27%47%15%17%25%
2201
16th to endDay
36%5%12%25%14%4
2312
August1st to 15thDay
30%38%17%17%22%
2325
16th to endDay
26%47%18%21%22%
2318
September1st to 15thDay
25%3417%21%28%
1980
16th to endDay
13%16%27%50%
1980
October1st to 15thDay
11%139%24%49%
1884
16th to endDay
10%119%23%53%
1920
November1st to 15thDay
12%11%32%41%
1909
16th to endDay
16%119%28%43%
1768
December1st to 15thDay
22%2215%31%26%
1755
16th to endDay
22%1419%32%19%
1872
January1st to 15thNight
20%1413%29%30%
2471
16th to endNight
24%1214%28%28%
2496
February1st to 15thNight
19%1215%26%35%
2187
16th to endNight
23%1114%30%28%
1859
March1st to 15thNight
17%118%25%45%
1980
16th to endNight
14%119%29%43%
2112
April1st to 15thNight
17%16%33%40%
1960
16th to endNight
7%15%22%61%
1745
May1st to 15thNight
8%116%24%57%
1620
16th to endNight
8%1420%64%
1685
June1st to 15thNight
10%216%68%
1620
16th to endNight
11%12312%69%
1620
July1st to 15thNight
23%49%17%16%26%
1530
16th to endNight
29%5%15%25%17%5%
1593
August1st to 15thNight
21%413%22%14%24%
1611
16th to endNight
23%39%20%22%20%
1881
September1st to 15thNight
25%36%20%20%23%
1980
16th to endNight
11%117%28%50%
1980
October1st to 15thNight
11%1111%23%50%
2074
16th to endNight
10%119%23%54%
2304
November1st to 15thNight
13%1111%30%40%
2280
16th to endNight
17%119%26%43%
2520
December1st to 15thNight
21%1215%28%30%
2535
16th to endNight
25%1417%28%22%
2704

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
9%13%35%33%7%
123
16th to endDay
6%311%35%29%14%
96
February1st to 15thDay
7%314%31%35%6%
189
16th to endDay
7%8%26%34%18%3
238
March1st to 15thDay
6%8%24%32%18%10%
270
16th to endDay
39%25%30%20%10%
288
April1st to 15thDay
312%28%26%19%8%
269
16th to endDay
212%31%31%17%4
270
May1st to 15thDay
310%28%32%18%6%
288
16th to endDay
16%23%34%27%6%
330
June1st to 15thDay
4218%40%24%10%
315
16th to endDay
5%8%36%31%17%
315
July1st to 15thDay
35%32%40%17%
305
16th to endDay
41125%36%29%
327
August1st to 15thDay
5%423%42%22%
315
16th to endDay
3321%43%28%
332
September1st to 15thDay
7%19%33%34%13%
315
16th to endDay
4117%33%30%12%
315
October1st to 15thDay
4216%26%31%18%
219
16th to endDay
2320%38%34%
144
November1st to 15thDay
317%31%40%15%
135
16th to endDay
6%211%29%31%19%
135
December1st to 15thDay
7%26%31%40%11%
135
16th to endDay
6%311%31%31%14%
144
January1st to 15thNight
7%7%50%29%5%
764
16th to endNight
8%111%47%27%3
768
February1st to 15thNight
7%110%46%30%3
704
16th to endNight
7%16%53%19%2
632
March1st to 15thNight
6%115%44%27%3
720
16th to endNight
2212%45%31%4
768
April1st to 15thNight
4217%50%21%1
701
16th to endNight
2219%47%24%2
540
May1st to 15thNight
1216%49%28%2
540
16th to endNight
2116%45%32%1
563
June1st to 15thNight
219%48%36%2
540
16th to endNight
15%37%54%1
540
July1st to 15thNight
3424%58%8%
510
16th to endNight
416%64%13%
564
August1st to 15thNight
322%59%14%
539
16th to endNight
2222%60%11%
627
September1st to 15thNight
45%26%52%10%
720
16th to endNight
27%38%44%5%
716
October1st to 15thNight
210%42%38%5%
720
16th to endNight
218%35%44%8%
768
November1st to 15thNight
37%44%38%5%
760
16th to endNight
6%8%41%34%7%
780
December1st to 15thNight
8%18%44%32%4
780
16th to endNight
9%18%47%25%7%
832
Page generated at 2018-01-12 20:01:29. Version ac04

Copyright 2018 A. Danko


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