Champion Saddle
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Champion Saddle clear sky chart from 2005-11-05 to 2017-09-21.

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
47%
14820
15%
46926
15%
14787
48%
14787
19%
32876

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
33%
719
11%
2506
11%
716
35%
716
12%
1914
January16th to endNight
41%
768
15%
2541
15%
768
44%
768
16%
1832
February1st to 15thNight
34%
700
8%
2288
9%
698
35%
698
11%
1819
February16th to endNight
31%
632
12%
1984
9%
632
36%
632
12%
1564
March1st to 15thNight
32%
720
7%
2032
5%
720
34%
720
11%
1662
March16th to endNight
29%
768
6%
2085
5%
768
30%
768
10%
1763
April1st to 15thNight
29%
719
6%
1799
4%
719
29%
719
11%
1527
April16th to endNight
40%
639
9%
1719
6%
639
40%
639
15%
1364
May1st to 15thNight
45%
420
11%
1501
12%
420
47%
420
16%
1036
May16th to endNight
42%
375
9%
1496
12%
374
43%
374
11%
1105
June1st to 15thNight
52%
360
9%
1440
16%
360
53%
360
15%
998
June16th to endNight
64%
360
16%
1440
27%
360
65%
360
27%
788
July1st to 15thNight
84%
340
22%
1360
37%
340
84%
340
48%
556
July16th to endNight
84%
409
33%
1447
44%
385
87%
385
60%
548
August1st to 15thNight
83%
538
31%
1611
28%
535
83%
535
57%
740
August16th to endNight
78%
681
37%
1827
26%
681
79%
681
61%
893
September1st to 15thNight
77%
720
34%
1800
22%
720
78%
720
61%
931
September16th to endNight
64%
680
28%
1872
24%
680
65%
680
34%
1152
October1st to 15thNight
59%
660
18%
1980
19%
660
60%
660
28%
1270
October16th to endNight
46%
704
15%
2114
17%
704
48%
704
18%
1535
November1st to 15thNight
32%
700
9%
2356
9%
700
34%
700
10%
1862
November16th to endNight
34%
720
8%
2520
9%
720
35%
720
12%
1945
December1st to 15thNight
36%
720
11%
2520
10%
720
39%
720
13%
1882
December16th to endNight
26%
768
11%
2688
10%
768
30%
768
9%
2190

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
20%10%24323335%39%
47954
Night
21%11%24423335%36%
47096
Cloud CoverDay
19%10%24423335%39%
47954
Night
19%11%35%423335%36%
47100
TransparencyDay
47%49%18%14%4
47629
Night
51%49%16%13%5%
46926
SeeingDay
28%11%27%21%7%2
5727
Night
27%5%13%26%22%3
14826

By Month

Percentage Cloud Cover NW (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
28%15%345%2333324%
1432
16th to endDay
27%13%3332233432%
1680
February1st to 15thDay
27%16%25%4345%5%5%19%
1576
16th to endDay
24%22%36%5%33435%19%
1489
March1st to 15thDay
29%17%36%5%2434417%
1926
16th to endDay
30%20%35%42333417%
2139
April1st to 15thDay
28%21%45%42323418%
2149
16th to endDay
25%15%25%424345%26%
2238
May1st to 15thDay
21%11%34322346%35%
2448
16th to endDay
31%10%35%423346%26%
2615
June1st to 15thDay
25%8%25%5%23436%33%
2520
16th to endDay
13%6%23324346%49%
2520
July1st to 15thDay
5%21221323371%
2520
16th to endDay
5%21211122375%
2621
August1st to 15thDay
422212346%69%
2340
16th to endDay
5%22212235%72%
2375
September1st to 15thDay
5%212212135%71%
2160
16th to endDay
15%5%25%323345%48%
1880
October1st to 15thDay
22%7%2442334440%
1650
16th to endDay
27%7%14423345%34%
1757
November1st to 15thDay
35%9%245%33345%22%
1503
16th to endDay
27%15%25%5%3343324%
1440
December1st to 15thDay
26%15%35%5%2334426%
1440
16th to endDay
33%19%3341323420%
1536
January1st to 15thNight
29%13%26%5%2333424%
2506
16th to endNight
25%11%345%3333431%
2541
February1st to 15thNight
25%15%46%6%25%236%21%
2276
16th to endNight
23%23%34313335%23%
1984
March1st to 15thNight
28%17%245%24345%21%
2032
16th to endNight
28%19%46%42334417%
2081
April1st to 15thNight
27%20%45%5%2333319%
1799
16th to endNight
24%14%24424447%26%
1719
May1st to 15thNight
18%11%25%42345%6%35%
1500
16th to endNight
24%11%35%433346%27%
1496
June1st to 15thNight
20%7%36%434447%34%
1440
16th to endNight
15%5%22212235%54%
1440
July1st to 15thNight
421212233471%
1440
16th to endNight
3112123377%
1545
August1st to 15thNight
322312345%70%
1620
16th to endNight
4112212235%73%
1827
September1st to 15thNight
5%21221122374%
1800
16th to endNight
14%414223335%50%
1872
October1st to 15thNight
15%5%2432444447%
1980
16th to endNight
23%9%36%6%2333433%
2114
November1st to 15thNight
32%11%36%434446%19%
2356
16th to endNight
31%12%25%32433425%
2520
December1st to 15thNight
28%13%25%413345%27%
2520
16th to endNight
32%19%3432333320%
2688

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
26%15%46%43333424%
1432
16th to endDay
25%13%3432233432%
1680
February1st to 15thDay
23%16%35%6%245%46%19%
1576
16th to endDay
20%21%5%6%6%24435%18%
1489
March1st to 15thDay
26%18%47%5%25%345%17%
1926
16th to endDay
28%21%35%433245%16%
2139
April1st to 15thDay
25%23%45%42334418%
2149
16th to endDay
23%16%35%324345%26%
2238
May1st to 15thDay
20%11%34423246%35%
2448
16th to endDay
31%10%25%422346%26%
2615
June1st to 15thDay
25%8%345%23336%33%
2520
16th to endDay
13%5%24324346%49%
2520
July1st to 15thDay
5%11221333471%
2520
16th to endDay
421221122375%
2621
August1st to 15thDay
322212346%69%
2340
16th to endDay
421121233473%
2375
September1st to 15thDay
4213212225%71%
2160
16th to endDay
15%5%24313345%48%
1880
October1st to 15thDay
20%8%2342344440%
1650
16th to endDay
24%7%25%5%23445%35%
1757
November1st to 15thDay
32%12%245%33345%21%
1503
16th to endDay
25%14%25%5%45%33424%
1440
December1st to 15thDay
22%16%37%42434427%
1440
16th to endDay
30%20%35%42323320%
1536
January1st to 15thNight
26%14%36%5%23335%24%
2506
16th to endNight
22%11%35%43333431%
2541
February1st to 15thNight
22%15%5%7%6%34436%21%
2276
16th to endNight
20%23%45%42344423%
1984
March1st to 15thNight
23%19%46%434345%20%
2032
16th to endNight
24%21%47%5%24346%16%
2085
April1st to 15thNight
26%19%46%5%3333319%
1799
16th to endNight
22%16%34424435%26%
1719
May1st to 15thNight
18%10%3443435%6%34%
1500
16th to endNight
24%11%45%5%33447%26%
1496
June1st to 15thNight
20%8%36%434446%34%
1440
16th to endNight
14%424213335%53%
1440
July1st to 15thNight
321311333471%
1440
16th to endNight
311111223476%
1545
August1st to 15thNight
3113212335%70%
1620
16th to endNight
3212211235%73%
1827
September1st to 15thNight
421211122474%
1800
16th to endNight
14%414324345%50%
1872
October1st to 15thNight
15%5%25%424445%46%
1980
16th to endNight
22%9%27%5%2434433%
2114
November1st to 15thNight
31%11%26%5%34445%19%
2356
16th to endNight
27%13%36%424335%25%
2520
December1st to 15thNight
24%15%45%42333427%
2520
16th to endNight
28%20%45%42333320%
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
64%38%9%8%5%
1432
16th to endDay
56%27%15%10%7%
1680
February1st to 15thDay
64%6%10%10%7%
1576
16th to endDay
68%5%7%10%6%1
1489
March1st to 15thDay
70%5%7%9%5%
1926
16th to endDay
71%5%8%9%4
2139
April1st to 15thDay
69%5%10%9%4
2149
16th to endDay
60%6%12%12%6%1
2238
May1st to 15thDay
51%414%19%9%
2448
16th to endDay
60%412%18%3
2619
June1st to 15thDay
52%6%11%20%7%1
2520
16th to endDay
35%5%15%27%12%2
2520
July1st to 15thDay
18%311%25%31%9%
2371
16th to endDay
15%2422%38%16%
2457
August1st to 15thDay
16%310%33%26%9%
2324
16th to endDay
15%37%29%35%8%
2375
September1st to 15thDay
17%36%24%31%17%
2160
16th to endDay
36%39%25%18%6%
1880
October1st to 15thDay
46%5%9%16%17%5%
1650
16th to endDay
50%5%11%14%14%4
1757
November1st to 15thDay
64%39%11%9%1
1503
16th to endDay
63%46%11%7%6%
1440
December1st to 15thDay
60%46%16%10%
1440
16th to endDay
69%36%11%7%2
1536
January1st to 15thNight
62%38%9%10%4
2506
16th to endNight
56%37%12%10%9%
2541
February1st to 15thNight
65%49%11%7%1
2288
16th to endNight
63%5%7%14%7%2
1984
March1st to 15thNight
66%5%7%13%6%
2032
16th to endNight
70%5%10%9%4
2085
April1st to 15thNight
70%410%8%5%
1799
16th to endNight
59%7%14%12%41
1719
May1st to 15thNight
50%7%13%16%10%1
1501
16th to endNight
59%6%13%17%3
1496
June1st to 15thNight
51%7%11%22%6%
1440
16th to endNight
33%5%16%29%10%3
1440
July1st to 15thNight
16%411%26%29%11%
1360
16th to endNight
12%26%21%41%15%
1447
August1st to 15thNight
16%39%33%28%9%
1611
16th to endNight
15%39%28%33%9%
1827
September1st to 15thNight
16%37%24%32%16%
1800
16th to endNight
35%48%23%17%10%
1872
October1st to 15thNight
40%6%10%17%18%7%
1980
16th to endNight
54%49%12%14%4
2114
November1st to 15thNight
66%39%9%9%2
2356
16th to endNight
62%5%6%8%9%7%
2520
December1st to 15thNight
60%47%14%12%
2520
16th to endNight
69%45%11%6%2
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
45%8%20%18%8%
60
16th to endDay
40%9%17%17%13%1
208
February1st to 15thDay
38%13%22%19%6%
236
16th to endDay
43%15%21%17%2
223
March1st to 15thDay
51%12%20%12%2
270
16th to endDay
47%13%23%12%3
288
April1st to 15thDay
45%11%18%17%5%1
269
16th to endDay
42%17%20%12%22
270
May1st to 15thDay
35%14%27%15%42
288
16th to endDay
38%8%19%20%8%4
330
June1st to 15thDay
28%9%31%20%6%3
315
16th to endDay
15%11%34%25%10%2
315
July1st to 15thDay
10%9%37%28%9%4
305
16th to endDay
411%42%27%9%5%
327
August1st to 15thDay
28%39%33%9%6%
315
16th to endDay
6%14%30%28%12%7%
332
September1st to 15thDay
8%11%31%31%13%4
315
16th to endDay
19%13%31%24%11%
276
October1st to 15thDay
30%10%26%21%9%
255
16th to endDay
38%8%21%23%7%
269
November1st to 15thDay
33%6%20%29%6%2
77
16th to endDay
33%20%25%15%6%
60
December1st to 15thDay
55%16%18%10%
60
16th to endDay
46%6%12%20%12%1
64
January1st to 15thNight
35%8%18%23%13%1
720
16th to endNight
30%6%15%24%17%4
768
February1st to 15thNight
33%418%28%14%
704
16th to endNight
34%10%17%26%9%
632
March1st to 15thNight
38%8%15%24%12%1
720
16th to endNight
40%8%14%21%12%1
768
April1st to 15thNight
39%8%15%19%15%1
719
16th to endNight
33%415%21%20%4
639
May1st to 15thNight
27%5%13%26%24%2
421
16th to endNight
32%411%24%24%2
375
June1st to 15thNight
22%215%31%25%2
360
16th to endNight
19%110%33%33%1
360
July1st to 15thNight
46%38%46%3
340
16th to endNight
5%16%34%48%3
409
August1st to 15thNight
5%427%52%9%
538
16th to endNight
5%210%32%41%7%
681
September1st to 15thNight
6%110%27%44%8%
720
16th to endNight
17%29%35%28%7%
680
October1st to 15thNight
19%310%36%25%4
660
16th to endNight
27%6%11%27%19%6%
704
November1st to 15thNight
38%5%16%24%12%2
700
16th to endNight
36%7%15%25%13%1
720
December1st to 15thNight
34%6%17%27%11%2
720
16th to endNight
43%8%16%19%10%1
768
Page generated at 2017-09-22 04:35:33. Version ac04

Copyright 2017 A. Danko


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