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 2017-09-20.

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%
15417
26%
46971
19%
15374
59%
15374
35%
26725

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%
897
26%
2327
12%
895
45%
895
32%
1480
January16th to endNight
36%
937
29%
2473
12%
937
46%
937
32%
1552
February1st to 15thNight
35%
704
27%
2107
13%
699
46%
699
30%
1241
February16th to endNight
28%
607
28%
1869
10%
607
42%
607
29%
1102
March1st to 15thNight
30%
540
27%
1980
13%
540
47%
540
25%
1154
March16th to endNight
35%
576
24%
2112
16%
576
47%
576
27%
1181
April1st to 15thNight
30%
539
23%
1977
12%
539
45%
539
27%
1109
April16th to endNight
32%
540
25%
1794
15%
540
48%
540
29%
1053
May1st to 15thNight
35%
539
22%
1620
16%
539
45%
539
32%
967
May16th to endNight
52%
561
26%
1684
23%
561
60%
561
39%
931
June1st to 15thNight
74%
540
23%
1620
24%
540
78%
540
51%
789
June16th to endNight
72%
540
21%
1620
23%
540
76%
540
37%
921
July1st to 15thNight
77%
510
21%
1530
25%
510
79%
510
46%
803
July16th to endNight
84%
564
24%
1594
28%
531
86%
531
47%
826
August1st to 15thNight
88%
539
28%
1610
31%
536
89%
536
58%
745
August16th to endNight
78%
573
19%
1996
24%
573
79%
573
33%
1111
September1st to 15thNight
77%
540
21%
1980
24%
540
79%
540
36%
1056
September16th to endNight
69%
507
27%
1870
28%
507
71%
507
32%
1024
October1st to 15thNight
70%
539
36%
1859
32%
539
74%
539
44%
895
October16th to endNight
61%
704
36%
2112
25%
704
67%
704
48%
1062
November1st to 15thNight
53%
700
30%
2100
20%
700
59%
700
37%
1181
November16th to endNight
48%
861
31%
2301
18%
861
55%
861
39%
1338
December1st to 15thNight
39%
900
27%
2340
14%
900
45%
900
29%
1551
December16th to endNight
37%
960
24%
2496
11%
960
44%
960
28%
1653

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%
47860
Night
10%42332335%7%51%
47172
TransparencyDay
38%410%20%17%8%
47560
Night
32%312%22%18%10%
46977
SeeingDay
11%5%15%28%29%10%
5395
Night
13%5%23%36%18%1
15423

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%23413436%45%
1611
16th to endDay
17%5%2321333451%
1761
February1st to 15thDay
17%5%2431333450%
1750
16th to endDay
17%6%25%323235%46%
1604
March1st to 15thDay
21%7%24423346%40%
1980
16th to endDay
16%5%34323336%46%
2110
April1st to 15thDay
12%6%36%5%3445%7%41%
1971
16th to endDay
13%6%26%5%2445%6%42%
2162
May1st to 15thDay
13%6%36%6%35%6%5%6%37%
2331
16th to endDay
11%6%26%5%35%6%5%9%35%
2430
June1st to 15thDay
4315%447%6%7%9%44%
2340
16th to endDay
7%5%36%6%47%7%7%9%33%
2340
July1st to 15thDay
7%425%6%46%6%8%11%36%
2340
16th to endDay
5%3247%47%7%6%12%38%
2466
August1st to 15thDay
2112445%5%6%11%53%
2340
16th to endDay
7%426%6%37%7%7%9%36%
2203
September1st to 15thDay
7%5%26%7%46%5%5%7%40%
1980
16th to endDay
8%415%5%36%6%6%7%43%
1859
October1st to 15thDay
8%4144245%5%7%51%
1760
16th to endDay
9%31321223464%
1760
November1st to 15thDay
10%5%35%43446%6%47%
1758
16th to endDay
13%5%2432323453%
1656
December1st to 15thDay
20%6%26%423345%40%
1620
16th to endDay
15%6%36%434445%39%
1728
January1st to 15thNight
18%5%14223335%48%
2327
16th to endNight
17%5%23323235%50%
2473
February1st to 15thNight
16%6%23312235%51%
2102
16th to endNight
14%5%33323335%49%
1869
March1st to 15thNight
17%6%24313346%46%
1980
16th to endNight
12%5%24324347%49%
2112
April1st to 15thNight
10%6%2442345%8%47%
1977
16th to endNight
13%6%24423347%46%
1794
May1st to 15thNight
8%5%25%5%335%6%9%45%
1619
16th to endNight
6%3234145%6%10%49%
1683
June1st to 15thNight
311231346%11%60%
1620
16th to endNight
4324425%5%6%9%50%
1620
July1st to 15thNight
5%21332436%10%56%
1620
16th to endNight
3212225%45%12%55%
1702
August1st to 15thNight
12212337%11%63%
1620
16th to endNight
5%3235%35%5%7%11%46%
1996
September1st to 15thNight
6%42342446%10%50%
1980
16th to endNight
7%4145%2446%7%49%
1870
October1st to 15thNight
6%413323246%61%
1859
16th to endNight
8%31221323465%
2112
November1st to 15thNight
10%41343335%7%52%
2100
16th to endNight
13%423312235%56%
2301
December1st to 15thNight
16%6%34433335%44%
2340
16th to endNight
17%7%24323345%44%
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
41%26%17%20%11%
1612
16th to endDay
37%25%16%23%14%
1761
February1st to 15thDay
38%16%17%20%15%
1751
16th to endDay
41%26%17%20%12%
1604
March1st to 15thDay
46%16%12%20%11%
1980
16th to endDay
40%27%17%23%8%
2112
April1st to 15thDay
42%27%18%16%11%
1971
16th to endDay
42%36%20%17%9%
2162
May1st to 15thDay
45%5%9%15%15%8%
2331
16th to endDay
42%5%11%21%15%4
2434
June1st to 15thDay
32%5%12%25%21%3
2340
16th to endDay
42%6%12%22%13%2
2340
July1st to 15thDay
36%6%17%27%11%1
2201
16th to endDay
34%5%21%27%9%
2311
August1st to 15thDay
23%5%19%34%15%1
2326
16th to endDay
39%7%18%23%8%2
2203
September1st to 15thDay
40%5%12%21%15%4
1980
16th to endDay
36%5%9%20%17%10%
1859
October1st to 15thDay
32%39%20%19%15%
1760
16th to endDay
25%1317%32%19%
1760
November1st to 15thDay
36%38%21%17%11%
1758
16th to endDay
35%26%13%21%20%
1656
December1st to 15thDay
47%17%17%17%8%
1620
16th to endDay
45%28%16%17%9%
1728
January1st to 15thNight
39%15%17%20%15%
2327
16th to endNight
38%2416%21%16%
2473
February1st to 15thNight
37%15%15%20%18%
2112
16th to endNight
37%25%18%20%15%
1869
March1st to 15thNight
39%39%15%19%12%
1980
16th to endNight
35%310%16%21%10%
2112
April1st to 15thNight
35%49%18%18%13%
1977
16th to endNight
38%210%21%15%11%
1794
May1st to 15thNight
35%412%21%16%9%
1620
16th to endNight
28%417%30%15%3
1685
June1st to 15thNight
18%5%17%29%26%3
1620
16th to endNight
28%6%17%30%15%2
1620
July1st to 15thNight
23%424%35%11%
1530
16th to endNight
20%6%29%35%7%
1594
August1st to 15thNight
13%5%28%37%14%
1610
16th to endNight
28%8%25%27%7%2
1996
September1st to 15thNight
28%5%21%24%14%5%
1980
16th to endNight
32%414%20%17%10%
1870
October1st to 15thNight
23%310%27%20%14%
1859
16th to endNight
23%25%18%27%22%
2112
November1st to 15thNight
31%311%22%19%12%
2100
16th to endNight
32%17%15%20%22%
2301
December1st to 15thNight
43%27%19%18%9%
2340
16th to endNight
42%25%16%20%11%
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
15%433%36%8%1
90
16th to endDay
19%16%32%19%10%1
96
February1st to 15thDay
14%15%33%22%14%
90
16th to endDay
19%16%34%20%7%1
81
March1st to 15thDay
23%15%31%16%11%2
90
16th to endDay
12%6%29%33%16%2
96
April1st to 15thDay
11%12%36%24%13%2
90
16th to endDay
18%7%31%28%12%
272
May1st to 15thDay
15%8%33%29%10%1
468
16th to endDay
17%7%23%31%19%1
517
June1st to 15thDay
6%7%43%32%9%
495
16th to endDay
8%27%34%32%14%
495
July1st to 15thDay
5%15%31%42%12%
475
16th to endDay
42122%50%18%
515
August1st to 15thDay
41117%53%21%
493
16th to endDay
13%4325%31%21%
243
September1st to 15thDay
15%20%49%22%
135
16th to endDay
416%47%30%
102
October1st to 15thDay
11437%44%11%
90
16th to endDay
17%13%29%30%9%
96
November1st to 15thDay
20%6%18%36%10%7%
90
16th to endDay
20%11%30%20%12%6%
90
December1st to 15thDay
27%125%22%13%10%
90
16th to endDay
19%20%30%22%5%1
96
January1st to 15thNight
20%9%27%31%10%
900
16th to endNight
21%9%29%32%7%
937
February1st to 15thNight
20%10%29%33%6%
704
16th to endNight
19%8%41%26%4
607
March1st to 15thNight
22%6%37%27%5%
540
16th to endNight
14%8%38%32%5%
576
April1st to 15thNight
12%9%44%30%3
539
16th to endNight
16%7%40%26%9%
540
May1st to 15thNight
11%7%42%31%6%
540
16th to endNight
7%330%41%16%
563
June1st to 15thNight
414%54%24%1
540
16th to endNight
4211%48%28%4
540
July1st to 15thNight
418%47%36%2
510
16th to endNight
41346%39%4
564
August1st to 15thNight
2250%38%5%
539
16th to endNight
6%340%42%6%
573
September1st to 15thNight
7%1436%45%5%
540
16th to endNight
10%8%30%43%6%
507
October1st to 15thNight
8%113%44%26%5%
539
16th to endNight
10%5%20%37%24%2
704
November1st to 15thNight
10%426%36%21%1
700
16th to endNight
16%7%23%33%18%1
861
December1st to 15thNight
21%6%26%32%11%
900
16th to endNight
21%8%26%31%10%
960
Page generated at 2017-09-21 06:18:18. Version ac04

Copyright 2017 A. Danko


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