Papoose Flat
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Papoose Flat clear sky chart from 2005-11-05 to 2017-09-17.

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%
15429
36%
46833
26%
15398
73%
15398
60%
20492

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
52%
716
31%
2506
19%
716
71%
716
54%
1027
January16th to endNight
50%
768
34%
2523
23%
768
67%
768
48%
1167
February1st to 15thNight
54%
700
35%
2103
23%
697
70%
697
59%
928
February16th to endNight
51%
632
34%
1895
25%
632
66%
632
53%
902
March1st to 15thNight
51%
720
32%
2160
20%
720
69%
720
56%
991
March16th to endNight
50%
768
35%
2007
18%
768
64%
768
59%
986
April1st to 15thNight
46%
719
34%
1799
13%
719
58%
719
58%
929
April16th to endNight
49%
720
36%
1800
12%
720
60%
720
64%
877
May1st to 15thNight
51%
554
33%
1634
18%
554
60%
554
56%
734
May16th to endNight
52%
519
31%
1643
21%
519
62%
519
50%
731
June1st to 15thNight
67%
360
33%
1440
32%
360
79%
360
56%
524
June16th to endNight
76%
360
39%
1440
42%
360
86%
360
75%
443
July1st to 15thNight
84%
340
33%
1360
39%
340
88%
340
57%
509
July16th to endNight
83%
416
37%
1454
40%
392
85%
392
55%
583
August1st to 15thNight
78%
717
36%
1790
22%
713
81%
713
74%
844
August16th to endNight
84%
764
44%
1910
28%
764
85%
764
78%
875
September1st to 15thNight
84%
720
43%
1818
29%
720
89%
720
78%
828
September16th to endNight
79%
664
45%
1837
36%
664
86%
664
77%
776
October1st to 15thNight
68%
660
40%
1859
33%
660
77%
660
63%
854
October16th to endNight
70%
704
42%
2175
38%
704
80%
704
66%
881
November1st to 15thNight
66%
700
39%
2275
32%
700
80%
700
71%
858
November16th to endNight
65%
720
39%
2340
32%
720
78%
720
64%
944
December1st to 15thNight
57%
720
33%
2377
21%
720
73%
720
51%
1058
December16th to endNight
45%
768
32%
2688
19%
768
64%
768
41%
1243

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
1212213346%69%
47938
Night
1212212346%71%
47018
TransparencyDay
14%26%18%28%28%
47614
Night
13%28%21%31%22%
46843
SeeingDay
6%14%36%28%11%1
5758
Night
3426%41%21%2
15440

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
11221345%8%68%
1432
16th to endDay
241332346%6%61%
1695
February1st to 15thDay
212223349%66%
1751
16th to endDay
1322323448%63%
1579
March1st to 15thDay
21232335%9%65%
1800
16th to endDay
1123235%6%10%62%
2213
April1st to 15thDay
1313223347%66%
2149
16th to endDay
112213347%70%
2160
May1st to 15thDay
1313222346%68%
2313
16th to endDay
232432335%5%63%
2468
June1st to 15thDay
11221335%6%69%
2520
16th to endDay
1211222379%
2520
July1st to 15thDay
221332443466%
2520
16th to endDay
221242445%5%64%
2612
August1st to 15thDay
11121223378%
2160
16th to endDay
112212335%76%
2292
September1st to 15thDay
111222223475%
2140
16th to endDay
111123481%
1828
October1st to 15thDay
2212212235%74%
1769
16th to endDay
122113345%74%
1696
November1st to 15thDay
111212336%75%
1584
16th to endDay
1111235%7%73%
1620
December1st to 15thDay
21332335%10%65%
1581
16th to endDay
31221345%7%65%
1536
January1st to 15thNight
1212222347%69%
2506
16th to endNight
241322345%6%63%
2523
February1st to 15thNight
121221346%9%65%
2101
16th to endNight
241221245%7%64%
1895
March1st to 15thNight
11232435%8%66%
2160
16th to endNight
11221445%9%65%
2007
April1st to 15thNight
1123313347%67%
1799
16th to endNight
112312335%73%
1800
May1st to 15thNight
123311346%69%
1634
16th to endNight
2313312346%67%
1642
June1st to 15thNight
112223336%72%
1440
16th to endNight
1113484%
1440
July1st to 15thNight
111313327%71%
1440
16th to endNight
211332323472%
1552
August1st to 15thNight
11111222480%
1800
16th to endNight
111223480%
1910
September1st to 15thNight
11111222481%
1818
16th to endNight
1112235%80%
1837
October1st to 15thNight
1212212335%73%
1859
16th to endNight
11121233477%
2175
November1st to 15thNight
11112236%78%
2275
16th to endNight
12211125%8%71%
2340
December1st to 15thNight
21232445%7%64%
2377
16th to endNight
21332345%8%63%
2688

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
12%310%31%32%8%
1432
16th to endDay
21%310%26%25%13%
1695
February1st to 15thDay
14%210%30%28%13%
1751
16th to endDay
18%47%29%31%8%
1579
March1st to 15thDay
15%19%29%31%13%
1800
16th to endDay
15%210%30%28%12%
2213
April1st to 15thDay
16%27%26%29%16%
2149
16th to endDay
12%28%24%35%17%
2160
May1st to 15thDay
15%2418%39%18%
2313
16th to endDay
21%2316%36%19%
2471
June1st to 15thDay
12%2412%28%39%
2520
16th to endDay
9%12420%61%
2520
July1st to 15thDay
19%337%12%53%
2371
16th to endDay
18%36%9%15%46%
2448
August1st to 15thDay
9%237%20%57%
2146
16th to endDay
11%225%23%53%
2292
September1st to 15thDay
13%238%21%50%
2140
16th to endDay
7%2111%38%38%
1828
October1st to 15thDay
12%1416%38%26%
1769
16th to endDay
11%1218%41%23%
1696
November1st to 15thDay
10%19%28%35%14%
1584
16th to endDay
10%19%27%35%15%
1620
December1st to 15thDay
15%314%27%30%7%
1581
16th to endDay
16%6%15%26%24%11%
1536
January1st to 15thNight
14%213%28%32%7%
2506
16th to endNight
19%210%24%27%14%
2523
February1st to 15thNight
13%212%31%27%12%
2112
16th to endNight
16%410%26%34%7%
1895
March1st to 15thNight
15%38%30%28%13%
2160
16th to endNight
13%311%31%32%7%
2007
April1st to 15thNight
16%28%28%31%11%
1799
16th to endNight
11%27%28%35%14%
1800
May1st to 15thNight
15%15%22%39%14%
1635
16th to endNight
18%16%19%33%19%
1643
June1st to 15thNight
12%25%16%29%33%
1440
16th to endNight
5%117%26%57%
1440
July1st to 15thNight
14%139%17%52%
1360
16th to endNight
14%3411%19%46%
1454
August1st to 15thNight
10%128%23%53%
1790
16th to endNight
8%29%29%49%
1910
September1st to 15thNight
8%1211%26%49%
1818
16th to endNight
7%1213%33%41%
1837
October1st to 15thNight
13%1318%40%22%
1859
16th to endNight
10%1417%44%20%
2175
November1st to 15thNight
8%111%24%38%14%
2275
16th to endNight
11%29%26%35%15%
2340
December1st to 15thNight
16%314%31%26%7%
2377
16th to endNight
17%7%14%25%23%10%
2688

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
111%55%25%6%
60
16th to endDay
7%11%39%23%14%3
205
February1st to 15thDay
412%31%36%13%
266
16th to endDay
7%19%34%31%5%
238
March1st to 15thDay
221%34%24%11%5%
270
16th to endDay
7%23%33%29%5%
288
April1st to 15thDay
14%24%32%21%6%
269
16th to endDay
12%26%38%17%4
270
May1st to 15thDay
9%19%40%19%9%1
288
16th to endDay
11%18%33%23%12%
330
June1st to 15thDay
6%18%39%23%10%1
315
16th to endDay
216%36%24%16%3
315
July1st to 15thDay
6%6%36%33%13%3
305
16th to endDay
6%7%37%32%14%1
327
August1st to 15thDay
212%45%21%17%
315
16th to endDay
46%37%31%17%3
332
September1st to 15thDay
5%9%35%37%9%2
315
16th to endDay
411%33%36%13%1
260
October1st to 15thDay
5%16%36%30%8%1
255
16th to endDay
6%12%37%30%11%1
208
November1st to 15thDay
37%12%27%38%10%
90
16th to endDay
35%47%33%10%
90
December1st to 15thDay
29%34%51%1
83
16th to endDay
7%6%43%20%20%1
64
January1st to 15thNight
26%33%35%18%4
720
16th to endNight
5%5%32%37%16%2
768
February1st to 15thNight
25%32%41%14%3
704
16th to endNight
46%35%39%14%
632
March1st to 15thNight
1436%35%17%3
720
16th to endNight
27%35%37%15%1
768
April1st to 15thNight
46%38%34%14%1
719
16th to endNight
19%35%35%16%1
720
May1st to 15thNight
47%31%40%14%1
555
16th to endNight
6%6%28%39%17%
521
June1st to 15thNight
3323%52%18%
360
16th to endNight
1119%56%20%
360
July1st to 15thNight
27%52%33%2
340
16th to endNight
36%57%31%
416
August1st to 15thNight
215%54%25%1
717
16th to endNight
29%51%32%3
764
September1st to 15thNight
210%50%33%2
720
16th to endNight
1115%39%33%7%
664
October1st to 15thNight
1423%39%26%5%
660
16th to endNight
2419%41%25%5%
704
November1st to 15thNight
1227%34%27%7%
700
16th to endNight
3323%43%20%5%
720
December1st to 15thNight
35%30%43%15%2
720
16th to endNight
38%37%35%15%1
768
Page generated at 2017-09-18 05:38:20. Version ac04

Copyright 2017 A. Danko


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