Buescher State Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Buescher State Park clear sky chart from 2005-11-05 to 2018-11-30.

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
51%
16982
26%
51749
18%
16939
58%
16939
34%
29608

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
37%
972
27%
2522
12%
970
46%
970
32%
1596
January16th to endNight
37%
1015
29%
2679
12%
1015
46%
1015
32%
1684
February1st to 15thNight
34%
764
26%
2287
12%
759
44%
759
28%
1373
February16th to endNight
26%
657
26%
2023
9%
657
40%
657
27%
1236
March1st to 15thNight
29%
585
26%
2145
12%
585
46%
585
24%
1257
March16th to endNight
34%
624
23%
2288
15%
624
46%
624
27%
1284
April1st to 15thNight
29%
584
23%
2142
12%
584
45%
584
27%
1205
April16th to endNight
33%
579
25%
1920
15%
579
49%
579
30%
1115
May1st to 15thNight
36%
584
23%
1755
17%
584
46%
584
32%
1050
May16th to endNight
53%
609
26%
1828
23%
609
62%
609
42%
987
June1st to 15thNight
72%
585
24%
1755
24%
585
78%
585
53%
841
June16th to endNight
72%
585
21%
1755
22%
585
76%
585
37%
997
July1st to 15thNight
78%
555
20%
1665
24%
555
80%
555
46%
876
July16th to endNight
84%
612
25%
1738
28%
579
87%
579
49%
886
August1st to 15thNight
88%
575
28%
1717
31%
572
89%
572
59%
790
August16th to endNight
80%
621
19%
2163
23%
621
81%
621
34%
1181
September1st to 15thNight
75%
585
19%
2145
23%
585
76%
585
32%
1189
September16th to endNight
67%
582
25%
2145
27%
582
70%
582
29%
1216
October1st to 15thNight
72%
637
35%
2197
32%
637
76%
637
44%
1059
October16th to endNight
59%
832
35%
2496
24%
832
65%
832
45%
1298
November1st to 15thNight
51%
820
28%
2460
19%
820
57%
820
35%
1423
November16th to endNight
48%
1005
31%
2685
17%
1005
56%
1005
39%
1566
December1st to 15thNight
40%
975
27%
2535
15%
975
46%
975
29%
1679
December16th to endNight
37%
1040
23%
2704
11%
1040
43%
1040
27%
1820

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
11%5%25%5%35%5%5%7%43%
52546
Night
11%423323347%51%
51950
TransparencyDay
38%410%20%17%8%
52246
Night
32%312%22%18%10%
51755
SeeingDay
12%415%28%28%9%
6913
Night
13%5%23%36%18%1
16988

By Month

Percentage Cloud Cover SE (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
18%5%24423436%46%
1746
16th to endDay
16%6%2431333451%
1908
February1st to 15thDay
18%5%25%32333447%
1900
16th to endDay
19%6%26%323235%43%
1736
March1st to 15thDay
20%7%25%423346%40%
2145
16th to endDay
15%5%35%323336%46%
2286
April1st to 15thDay
12%6%36%5%3445%6%41%
2136
16th to endDay
13%5%26%42445%6%43%
2311
May1st to 15thDay
13%5%36%6%35%6%5%6%38%
2526
16th to endDay
10%6%26%5%35%6%5%9%38%
2638
June1st to 15thDay
4215%447%6%7%9%46%
2535
16th to endDay
8%5%36%6%47%7%7%9%34%
2535
July1st to 15thDay
6%425%6%46%6%8%11%37%
2535
16th to endDay
5%3246%46%6%6%11%41%
2674
August1st to 15thDay
2113446%5%6%11%52%
2486
16th to endDay
7%326%6%37%7%8%9%37%
2387
September1st to 15thDay
8%6%27%7%46%5%5%7%37%
2145
16th to endDay
8%6%25%6%46%6%6%7%40%
2145
October1st to 15thDay
8%4145%245%5%7%50%
2080
16th to endDay
11%31331223461%
2080
November1st to 15thDay
11%5%25%43446%5%45%
2058
16th to endDay
12%5%2332334453%
1927
December1st to 15thDay
19%6%26%423345%40%
1755
16th to endDay
17%7%36%434445%38%
1872
January1st to 15thNight
17%5%14223335%49%
2522
16th to endNight
17%5%23323235%50%
2679
February1st to 15thNight
18%6%23312235%49%
2282
16th to endNight
16%6%34323335%47%
2023
March1st to 15thNight
17%6%24323446%45%
2145
16th to endNight
12%5%24324347%49%
2288
April1st to 15thNight
10%6%2442345%8%47%
2142
16th to endNight
13%5%24423347%47%
1920
May1st to 15thNight
8%5%25%5%335%6%8%45%
1754
16th to endNight
6%3234145%6%10%52%
1827
June1st to 15thNight
311231345%12%61%
1755
16th to endNight
4324425%5%6%9%51%
1755
July1st to 15thNight
421332346%10%56%
1755
16th to endNight
3212225%45%11%57%
1846
August1st to 15thNight
12212336%11%63%
1727
16th to endNight
5%2134345%7%11%48%
2163
September1st to 15thNight
7%5%245%2446%10%47%
2145
16th to endNight
7%5%25%5%345%6%7%46%
2145
October1st to 15thNight
5%31332335%7%60%
2197
16th to endNight
10%31231223463%
2496
November1st to 15thNight
11%5%14423347%50%
2460
16th to endNight
12%423423336%55%
2685
December1st to 15thNight
17%6%34433335%45%
2535
16th to endNight
18%7%24323345%42%
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
40%25%17%21%11%
1747
16th to endDay
37%25%15%24%14%
1908
February1st to 15thDay
41%16%16%18%14%
1901
16th to endDay
44%26%16%19%11%
1736
March1st to 15thDay
46%27%12%20%10%
2145
16th to endDay
40%27%17%23%7%
2288
April1st to 15thDay
42%27%18%17%11%
2136
16th to endDay
41%36%20%18%9%
2311
May1st to 15thDay
43%5%9%16%16%8%
2526
16th to endDay
40%5%11%22%16%3
2642
June1st to 15thDay
30%5%12%27%21%3
2535
16th to endDay
42%6%12%22%13%2
2535
July1st to 15thDay
35%6%18%25%11%1
2396
16th to endDay
32%5%20%29%11%
2519
August1st to 15thDay
24%5%19%33%15%1
2472
16th to endDay
38%7%18%23%9%2
2387
September1st to 15thDay
42%6%12%20%14%4
2145
16th to endDay
40%5%9%20%15%8%
2145
October1st to 15thDay
32%311%21%17%13%
2080
16th to endDay
28%2315%30%19%
2080
November1st to 15thDay
38%39%21%16%10%
2058
16th to endDay
34%26%16%22%17%
1927
December1st to 15thDay
47%17%17%18%8%
1755
16th to endDay
47%28%16%16%8%
1872
January1st to 15thNight
38%15%17%21%14%
2522
16th to endNight
38%2416%22%17%
2679
February1st to 15thNight
39%16%16%19%17%
2292
16th to endNight
40%25%18%19%13%
2023
March1st to 15thNight
39%39%15%19%11%
2145
16th to endNight
36%311%16%21%10%
2288
April1st to 15thNight
35%410%18%17%13%
2142
16th to endNight
37%210%22%16%11%
1920
May1st to 15thNight
35%412%21%16%8%
1755
16th to endNight
26%417%32%15%3
1829
June1st to 15thNight
17%417%31%25%3
1755
16th to endNight
28%6%16%30%15%1
1755
July1st to 15thNight
23%5%26%33%11%
1665
16th to endNight
19%6%26%37%8%
1738
August1st to 15thNight
13%5%28%36%14%1
1717
16th to endNight
26%8%25%27%8%2
2163
September1st to 15thNight
31%5%20%23%13%5%
2145
16th to endNight
35%414%21%16%8%
2145
October1st to 15thNight
23%312%28%19%12%
2197
16th to endNight
25%25%18%26%22%
2496
November1st to 15thNight
33%311%22%18%10%
2460
16th to endNight
32%17%18%21%18%
2685
December1st to 15thNight
42%27%19%18%9%
2535
16th to endNight
44%25%16%19%11%
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
16%432%32%11%2
135
16th to endDay
20%14%30%23%9%1
144
February1st to 15thDay
22%15%27%23%11%
135
16th to endDay
30%18%28%16%5%
120
March1st to 15thDay
21%14%35%20%7%1
135
16th to endDay
11%6%40%27%12%1
144
April1st to 15thDay
14%11%42%20%11%1
135
16th to endDay
17%7%30%30%13%
323
May1st to 15thDay
15%7%32%32%11%1
543
16th to endDay
14%6%21%33%21%2
597
June1st to 15thDay
5%8%43%32%9%
570
16th to endDay
10%26%35%31%13%
570
July1st to 15thDay
6%15%29%42%15%
550
16th to endDay
32224%50%16%
595
August1st to 15thDay
31219%53%19%
549
16th to endDay
11%3322%34%24%
299
September1st to 15thDay
8%417%43%25%
180
16th to endDay
10%225%37%22%
180
October1st to 15thDay
3110%30%38%15%
180
16th to endDay
23%118%26%22%7%
192
November1st to 15thDay
23%8%17%32%13%3
180
16th to endDay
15%10%28%24%15%5%
178
December1st to 15thDay
25%228%20%12%8%
135
16th to endDay
28%15%28%21%41
144
January1st to 15thNight
20%9%27%31%10%
975
16th to endNight
20%8%29%33%7%
1015
February1st to 15thNight
21%9%29%32%6%
764
16th to endNight
21%8%40%24%4
657
March1st to 15thNight
21%7%38%27%5%
585
16th to endNight
14%8%38%32%5%
624
April1st to 15thNight
12%9%44%29%3
584
16th to endNight
15%7%39%27%9%
579
May1st to 15thNight
11%7%41%32%6%
585
16th to endNight
7%230%41%16%
611
June1st to 15thNight
416%54%23%1
585
16th to endNight
5%211%49%27%4
585
July1st to 15thNight
417%46%36%3
555
16th to endNight
4447%38%4
612
August1st to 15thNight
2352%36%5%
575
16th to endNight
5%342%42%6%
621
September1st to 15thNight
8%1335%45%5%
585
16th to endNight
11%8%31%42%5%
582
October1st to 15thNight
7%112%43%29%5%
637
16th to endNight
12%5%20%36%23%2
832
November1st to 15thNight
12%425%36%19%1
820
16th to endNight
14%7%23%33%18%1
1005
December1st to 15thNight
22%6%25%32%12%
975
16th to endNight
23%8%26%31%9%
1040
Page generated at 2018-12-01 10:35:34. Version ac04

Copyright 2018 A. Danko


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