Pino Colorado
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Pino Colorado clear sky chart from 2005-11-05 to 2017-09-23.

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
62%
16211
37%
47036
26%
16166
72%
16166
51%
22654

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
47%
718
30%
2327
20%
716
61%
716
33%
1212
January16th to endNight
44%
768
37%
2319
21%
768
63%
768
33%
1253
February1st to 15thNight
47%
700
35%
2105
20%
697
66%
697
36%
1126
February16th to endNight
42%
632
32%
1895
25%
632
53%
632
30%
1099
March1st to 15thNight
47%
720
34%
2118
23%
720
63%
720
40%
1084
March16th to endNight
52%
768
36%
2112
22%
768
66%
768
47%
1092
April1st to 15thNight
45%
719
39%
1802
14%
719
61%
719
51%
932
April16th to endNight
51%
720
41%
1800
17%
720
64%
720
61%
858
May1st to 15thNight
54%
554
40%
1634
22%
554
65%
554
59%
710
May16th to endNight
61%
562
44%
1684
28%
561
71%
561
69%
661
June1st to 15thNight
68%
540
37%
1620
28%
540
72%
540
71%
652
June16th to endNight
83%
540
40%
1620
33%
540
85%
540
79%
619
July1st to 15thNight
89%
510
32%
1530
26%
510
89%
510
69%
626
July16th to endNight
85%
599
35%
1626
27%
564
87%
564
60%
745
August1st to 15thNight
91%
717
36%
1790
24%
713
91%
713
72%
854
August16th to endNight
88%
764
44%
1910
31%
764
88%
764
71%
918
September1st to 15thNight
84%
720
37%
1917
30%
720
86%
720
63%
924
September16th to endNight
77%
688
47%
1903
38%
688
86%
688
73%
816
October1st to 15thNight
63%
660
43%
1815
28%
660
77%
660
61%
840
October16th to endNight
72%
704
44%
2058
34%
704
83%
704
59%
940
November1st to 15thNight
59%
700
36%
2275
28%
700
73%
700
51%
1003
November16th to endNight
58%
720
38%
2340
31%
720
71%
720
46%
1090
December1st to 15thNight
54%
720
34%
2340
27%
720
67%
720
35%
1245
December16th to endNight
43%
768
33%
2496
22%
768
59%
768
30%
1355

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
2213323445%66%
47856
Night
1212323335%68%
47242
TransparencyDay
19%2212%27%34%
47555
Night
18%2213%27%35%
47045
SeeingDay
5%18%30%28%12%4
5892
Night
410%17%26%29%11%
16219

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
3214435%6%45%58%
1611
16th to endDay
5%21333446%6%56%
1902
February1st to 15thDay
14243245%5%6%58%
1751
16th to endDay
1326%5%36%5%6%6%52%
1579
March1st to 15thDay
3213433446%63%
1840
16th to endDay
23245%2433465%
2112
April1st to 15thDay
11134235%5%6%64%
2143
16th to endDay
1111112336%75%
2160
May1st to 15thDay
111213346%72%
2316
16th to endDay
121112482%
2429
June1st to 15thDay
121223479%
2340
16th to endDay
1111112382%
2340
July1st to 15thDay
231342445%6%61%
2340
16th to endDay
22145%36%6%7%9%48%
2428
August1st to 15thDay
2124145%6%7%62%
2160
16th to endDay
4224345%5%6%59%
2292
September1st to 15thDay
4213323446%62%
2043
16th to endDay
211211212379%
1893
October1st to 15thDay
11121333474%
1815
16th to endDay
11221233474%
1810
November1st to 15thDay
214214335%70%
1584
16th to endDay
221342333467%
1620
December1st to 15thDay
33245%36%5%46%53%
1620
16th to endDay
2315%445%6%6%5%54%
1728
January1st to 15thNight
1314445%6%5%5%56%
2327
16th to endNight
4213345%45%6%55%
2319
February1st to 15thNight
1323345%5%5%6%57%
2101
16th to endNight
1227%5%6%6%5%4452%
1895
March1st to 15thNight
2123335%5%47%61%
2118
16th to endNight
2212433447%63%
2112
April1st to 15thNight
1112224247%68%
1802
16th to endNight
111112335%77%
1800
May1st to 15thNight
11344476%
1634
16th to endNight
111122484%
1684
June1st to 15thNight
111211483%
1620
16th to endNight
1111287%
1620
July1st to 15thNight
111111237%75%
1620
16th to endNight
22123134410%62%
1736
August1st to 15thNight
12213347%72%
1800
16th to endNight
211211235%77%
1910
September1st to 15thNight
121221223376%
1917
16th to endNight
121112284%
1903
October1st to 15thNight
112212236%74%
1815
16th to endNight
11223435%72%
2058
November1st to 15thNight
1112324335%71%
2275
16th to endNight
2213233345%67%
2340
December1st to 15thNight
2313446%5%47%55%
2340
16th to endNight
322445%6%5%46%54%
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
26%3211%26%29%
1612
16th to endDay
26%2314%25%26%
1902
February1st to 15thDay
25%2211%26%30%
1751
16th to endDay
32%2114%29%19%
1579
March1st to 15thDay
23%2113%30%29%
1840
16th to endDay
24%2114%34%22%
2112
April1st to 15thDay
19%2115%39%21%
2143
16th to endDay
11%2114%34%35%
2160
May1st to 15thDay
13%210%33%39%
2316
16th to endDay
9%1112%35%39%
2432
June1st to 15thDay
10%18%23%55%
2340
16th to endDay
9%1317%67%
2340
July1st to 15thDay
21%3312%21%37%
2201
16th to endDay
23%6%11%21%21%14%
2276
August1st to 15thDay
17%5%5%18%21%31%
2146
16th to endDay
20%45%15%28%26%
2292
September1st to 15thDay
22%349%26%33%
2043
16th to endDay
12%117%28%48%
1893
October1st to 15thDay
13%2311%29%39%
1815
16th to endDay
15%2110%24%45%
1810
November1st to 15thDay
18%1212%27%37%
1584
16th to endDay
21%2212%24%37%
1620
December1st to 15thDay
31%3214%23%26%
1620
16th to endDay
30%2417%26%19%
1728
January1st to 15thNight
27%2212%26%27%
2327
16th to endNight
28%2211%24%29%
2319
February1st to 15thNight
26%3111%22%33%
2112
16th to endNight
34%3110%25%24%
1895
March1st to 15thNight
23%2210%29%30%
2118
16th to endNight
22%2314%31%26%
2112
April1st to 15thNight
17%2114%34%29%
1802
16th to endNight
11%1212%35%37%
1800
May1st to 15thNight
12%128%31%43%
1635
16th to endNight
7%19%36%44%
1685
June1st to 15thNight
9%18%23%57%
1620
16th to endNight
6%5%14%72%
1620
July1st to 15thNight
10%1417%23%42%
1530
16th to endNight
14%39%31%26%14%
1626
August1st to 15thNight
9%3421%30%30%
1790
16th to endNight
11%2317%37%28%
1910
September1st to 15thNight
13%3410%29%39%
1917
16th to endNight
8%117%30%50%
1903
October1st to 15thNight
13%1214%26%40%
1815
16th to endNight
14%2112%24%44%
2058
November1st to 15thNight
17%2112%31%34%
2275
16th to endNight
19%2212%27%36%
2340
December1st to 15thNight
28%3214%24%26%
2340
16th to endNight
30%3317%22%23%
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
16%28%24%24%41
90
16th to endDay
13%31%25%23%5%1
270
February1st to 15thDay
9%19%43%20%6%
266
16th to endDay
9%36%29%17%6%
238
March1st to 15thDay
7%29%32%18%10%1
270
16th to endDay
5%27%38%15%9%3
288
April1st to 15thDay
7%32%32%17%7%2
269
16th to endDay
428%42%16%7%1
270
May1st to 15thDay
6%25%36%23%5%3
288
16th to endDay
125%36%25%8%2
330
June1st to 15thDay
18%39%29%8%3
315
16th to endDay
36%32%40%12%6%
315
July1st to 15thDay
2321%41%22%7%
305
16th to endDay
3114%40%27%12%
327
August1st to 15thDay
1219%45%19%12%
315
16th to endDay
5%215%44%20%12%
332
September1st to 15thDay
9%6%25%36%17%5%
315
16th to endDay
6%10%33%36%9%2
284
October1st to 15thDay
322%38%27%7%
255
16th to endDay
5%14%29%28%19%2
184
November1st to 15thDay
224%31%21%16%4
90
16th to endDay
13%30%20%23%13%
90
December1st to 15thDay
5%22%21%25%21%4
90
16th to endDay
9%34%30%19%6%
96
January1st to 15thNight
6%16%22%26%19%8%
720
16th to endNight
11%16%20%28%19%4
768
February1st to 15thNight
6%15%23%28%21%4
704
16th to endNight
8%22%21%28%14%5%
632
March1st to 15thNight
6%18%23%28%17%5%
720
16th to endNight
7%12%22%28%21%7%
768
April1st to 15thNight
6%18%26%26%18%4
719
16th to endNight
316%26%26%20%5%
720
May1st to 15thNight
212%28%29%21%6%
555
16th to endNight
111%23%28%26%8%
563
June1st to 15thNight
6%22%33%29%7%
540
16th to endNight
1211%37%35%10%
540
July1st to 15thNight
21321%53%17%
510
16th to endNight
21120%47%25%
599
August1st to 15thNight
215%51%29%
717
16th to endNight
3313%46%32%
764
September1st to 15thNight
32420%50%19%
720
16th to endNight
1412%27%42%11%
688
October1st to 15thNight
39%19%33%27%7%
660
16th to endNight
15%15%29%33%13%
704
November1st to 15thNight
310%21%28%25%9%
700
16th to endNight
5%12%19%25%25%11%
720
December1st to 15thNight
6%14%18%29%24%6%
720
16th to endNight
10%19%21%26%16%5%
768
Page generated at 2017-09-24 06:15:46. Version ac04

Copyright 2017 A. Danko


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