Bucyrus
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Bucyrus clear sky chart from 2005-11-05 to 2018-02-14.

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
38%
16078
16%
48449
11%
16037
43%
16037
20%
33917

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
15%
780
10%
2522
4%
776
23%
776
10%
2008
January16th to endNight
17%
832
11%
2704
5%
832
24%
832
10%
2132
February1st to 15thNight
17%
757
9%
2432
5%
757
22%
757
11%
1886
February16th to endNight
19%
631
12%
1893
5%
631
25%
631
11%
1465
March1st to 15thNight
27%
720
13%
2053
9%
720
32%
720
16%
1554
March16th to endNight
32%
768
16%
2112
9%
768
37%
768
20%
1518
April1st to 15thNight
28%
629
13%
1850
7%
629
34%
629
20%
1311
April16th to endNight
34%
540
20%
1620
8%
540
44%
540
24%
1083
May1st to 15thNight
38%
540
13%
1620
8%
540
43%
540
19%
1172
May16th to endNight
51%
562
17%
1684
13%
561
54%
561
28%
1075
June1st to 15thNight
55%
540
14%
1582
12%
540
59%
540
31%
975
June16th to endNight
59%
540
17%
1440
13%
540
63%
540
33%
933
July1st to 15thNight
61%
510
16%
1385
14%
510
63%
510
34%
883
July16th to endNight
70%
564
18%
1595
16%
531
73%
531
37%
925
August1st to 15thNight
70%
539
20%
1609
18%
536
71%
536
33%
985
August16th to endNight
70%
573
22%
1736
20%
573
72%
573
35%
1010
September1st to 15thNight
62%
696
25%
1956
18%
696
66%
696
34%
1188
September16th to endNight
60%
717
27%
1980
22%
717
63%
717
34%
1216
October1st to 15thNight
47%
720
21%
2076
18%
720
51%
720
28%
1329
October16th to endNight
28%
768
20%
2355
14%
768
37%
768
19%
1639
November1st to 15thNight
37%
760
20%
2471
16%
760
44%
760
23%
1582
November16th to endNight
25%
780
15%
2535
10%
780
33%
780
15%
1828
December1st to 15thNight
18%
780
9%
2535
5%
780
24%
780
10%
1982
December16th to endNight
17%
832
8%
2704
3%
832
22%
832
8%
2238

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
15%9%47%6%35%45%7%31%
49612
Night
15%9%46%5%34446%34%
48634
Cloud CoverDay
15%9%47%6%3445%7%31%
49622
Night
15%9%46%5%34446%35%
48638
TransparencyDay
52%5%11%18%10%1
49315
Night
49%5%10%20%12%1
48449
SeeingDay
20%7%25%21%17%8%
6168
Night
20%7%27%28%14%1
16082

By Month

Percentage Cloud Cover NE (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
21%15%7%10%8%4433417%
1743
16th to endDay
15%17%8%12%9%4444315%
1872
February1st to 15thDay
16%15%6%10%9%35%435%18%
1728
16th to endDay
14%13%6%11%5%45%436%23%
1580
March1st to 15thDay
20%13%7%8%7%24335%23%
1894
16th to endDay
20%11%5%8%5%34436%26%
2112
April1st to 15thDay
18%11%45%5%245%6%5%29%
2107
16th to endDay
18%8%35%5%24346%36%
2340
May1st to 15thDay
19%8%36%6%35%5%5%5%30%
2331
16th to endDay
11%5%36%5%36%5%7%8%37%
2431
June1st to 15thDay
13%5%25%5%35%5%6%9%37%
2373
16th to endDay
11%5%35%5%35%6%7%9%36%
2520
July1st to 15thDay
11%6%25%5%36%6%6%9%38%
2490
16th to endDay
9%434435%6%7%10%39%
2465
August1st to 15thDay
9%415%5%36%6%7%10%39%
2340
16th to endDay
9%5%25%5%36%6%6%9%38%
2465
September1st to 15thDay
14%5%15%435%448%42%
1992
16th to endDay
15%6%35%424336%43%
1980
October1st to 15thDay
16%8%25%5%2435%7%37%
1884
16th to endDay
20%9%35%5%33346%32%
1866
November1st to 15thDay
14%8%46%5%3435%6%38%
1717
16th to endDay
17%14%5%7%434237%28%
1755
December1st to 15thDay
18%17%8%10%7%34335%17%
1755
16th to endDay
21%17%8%10%6%34335%14%
1872
January1st to 15thNight
20%16%5%9%6%3343421%
2522
16th to endNight
16%15%7%8%7%35%435%22%
2704
February1st to 15thNight
17%13%7%10%5%34345%24%
2430
16th to endNight
17%14%5%10%7%35%34425%
1893
March1st to 15thNight
18%11%37%6%3435%5%29%
2041
16th to endNight
14%9%47%6%25%446%33%
2112
April1st to 15thNight
16%8%36%5%3446%6%32%
1850
16th to endNight
14%7%35%5%345%46%40%
1620
May1st to 15thNight
19%6%27%6%35%45%7%31%
1620
16th to endNight
13%424435%5%6%8%41%
1682
June1st to 15thNight
7%5%25%4345%5%8%46%
1582
16th to endNight
9%424435%7%6%11%41%
1440
July1st to 15thNight
8%5%145%3447%8%46%
1467
16th to endNight
5%324435%5%6%9%50%
1703
August1st to 15thNight
5%325%435%7%7%9%45%
1620
16th to endNight
8%4145%25%45%8%50%
1736
September1st to 15thNight
11%5%24413447%50%
1956
16th to endNight
13%5%2332435%6%49%
1980
October1st to 15thNight
14%6%25%434345%45%
2076
16th to endNight
21%7%35%5%24345%36%
2355
November1st to 15thNight
14%9%35%423447%40%
2471
16th to endNight
19%12%37%434346%29%
2535
December1st to 15thNight
21%15%6%9%5%23335%23%
2535
16th to endNight
21%17%7%9%6%3444416%
2704

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
21%15%7%10%7%5%343416%
1743
16th to endDay
16%16%8%12%9%4443415%
1872
February1st to 15thDay
16%15%6%11%9%34446%18%
1728
16th to endDay
14%13%6%11%6%35%446%23%
1580
March1st to 15thDay
20%13%7%8%7%34335%22%
1905
16th to endDay
20%11%5%7%6%34436%26%
2111
April1st to 15thDay
18%11%45%5%245%5%6%29%
2107
16th to endDay
18%8%35%6%24346%36%
2340
May1st to 15thDay
19%8%36%6%35%5%5%5%29%
2331
16th to endDay
10%5%36%6%36%6%6%8%37%
2431
June1st to 15thDay
13%5%25%6%345%6%8%37%
2373
16th to endDay
11%435%6%35%6%7%9%36%
2520
July1st to 15thDay
10%6%25%5%36%5%6%9%37%
2490
16th to endDay
9%325%5%35%6%7%11%39%
2465
August1st to 15thDay
8%4245%36%6%7%10%39%
2340
16th to endDay
9%5%25%6%46%5%7%9%38%
2465
September1st to 15thDay
13%5%25%435%348%42%
1992
16th to endDay
15%6%36%424346%43%
1980
October1st to 15thDay
15%8%25%5%2445%7%37%
1884
16th to endDay
20%9%35%5%33447%32%
1866
November1st to 15thDay
14%9%45%5%3435%6%38%
1717
16th to endDay
18%14%5%7%434236%28%
1755
December1st to 15thDay
18%17%8%10%6%34335%17%
1755
16th to endDay
21%18%9%10%6%34335%14%
1872
January1st to 15thNight
21%16%5%9%6%3343421%
2522
16th to endNight
16%16%7%9%7%3444422%
2704
February1st to 15thNight
17%13%7%10%5%34335%24%
2423
16th to endNight
17%14%5%10%7%3433424%
1893
March1st to 15thNight
18%12%37%7%34445%29%
2053
16th to endNight
14%9%47%6%25%447%33%
2112
April1st to 15thNight
17%8%37%6%2445%6%32%
1850
16th to endNight
14%7%35%4345%5%5%39%
1620
May1st to 15thNight
19%6%27%6%35%45%6%31%
1619
16th to endNight
12%5%245%345%6%9%40%
1682
June1st to 15thNight
7%5%24435%5%6%7%46%
1582
16th to endNight
9%5%15%435%6%7%11%41%
1440
July1st to 15thNight
8%5%235%335%6%7%46%
1467
16th to endNight
5%314435%5%5%9%50%
1703
August1st to 15thNight
5%325%435%7%7%8%45%
1620
16th to endNight
8%324425%35%8%50%
1736
September1st to 15thNight
10%5%24323447%50%
1956
16th to endNight
13%5%2332435%6%50%
1980
October1st to 15thNight
14%6%24434346%45%
2076
16th to endNight
21%7%35%5%24345%36%
2355
November1st to 15thNight
14%9%35%42335%7%40%
2471
16th to endNight
19%12%47%434446%29%
2535
December1st to 15thNight
21%14%6%9%5%23335%23%
2535
16th to endNight
21%17%7%8%6%3444416%
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
71%39%10%4
1744
16th to endDay
73%410%8%2
1872
February1st to 15thDay
68%47%12%6%
1730
16th to endDay
62%411%15%4
1580
March1st to 15thDay
65%49%14%5%
1905
16th to endDay
59%310%19%5%
2112
April1st to 15thDay
53%6%13%16%9%
2107
16th to endDay
49%410%20%12%3
2340
May1st to 15thDay
54%7%11%17%8%1
2331
16th to endDay
42%7%13%23%11%1
2435
June1st to 15thDay
42%6%12%25%12%
2373
16th to endDay
42%8%14%18%14%1
2520
July1st to 15thDay
41%7%12%20%16%2
2343
16th to endDay
36%9%15%24%11%1
2310
August1st to 15thDay
38%7%14%23%14%1
2327
16th to endDay
39%7%13%20%14%4
2465
September1st to 15thDay
41%5%10%22%16%2
1992
16th to endDay
43%49%19%21%
1980
October1st to 15thDay
46%5%10%19%17%1
1884
16th to endDay
52%313%19%9%
1866
November1st to 15thDay
47%410%21%12%3
1717
16th to endDay
58%310%18%8%
1755
December1st to 15thDay
70%39%12%4
1755
16th to endDay
73%39%9%2
1872
January1st to 15thNight
66%38%13%6%
2522
16th to endNight
65%410%14%5%
2704
February1st to 15thNight
63%310%14%7%
2432
16th to endNight
63%47%18%6%
1893
March1st to 15thNight
57%5%10%17%8%1
2053
16th to endNight
50%5%11%21%9%1
2112
April1st to 15thNight
51%411%16%15%
1850
16th to endNight
44%49%20%16%4
1620
May1st to 15thNight
52%6%10%18%11%1
1620
16th to endNight
38%7%11%23%16%2
1684
June1st to 15thNight
35%6%13%25%17%1
1582
16th to endNight
34%8%15%23%14%4
1440
July1st to 15thNight
35%6%11%22%20%2
1385
16th to endNight
28%7%15%28%16%3
1595
August1st to 15thNight
32%8%12%26%19%1
1609
16th to endNight
31%6%14%24%20%3
1736
September1st to 15thNight
33%5%10%24%20%4
1956
16th to endNight
34%5%8%26%23%2
1980
October1st to 15thNight
40%410%24%18%1
2076
16th to endNight
50%39%24%10%1
2355
November1st to 15thNight
43%411%22%14%3
2471
16th to endNight
56%310%19%9%
2535
December1st to 15thNight
65%310%14%6%
2535
16th to endNight
70%411%11%2
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
23%14%38%11%9%1
135
16th to endDay
27%18%39%12%
144
February1st to 15thDay
32%13%40%13%
130
16th to endDay
18%16%43%18%3
81
March1st to 15thDay
27%16%25%23%6%
195
16th to endDay
25%10%35%18%9%1
288
April1st to 15thDay
25%10%30%21%11%2
270
16th to endDay
24%10%29%17%11%7%
270
May1st to 15thDay
31%5%25%21%12%4
288
16th to endDay
18%427%24%16%9%
331
June1st to 15thDay
14%322%30%21%7%
348
16th to endDay
18%5%26%26%16%6%
495
July1st to 15thDay
17%123%26%21%9%
447
16th to endDay
10%112%26%30%19%
326
August1st to 15thDay
15%111%24%28%19%
313
16th to endDay
11%314%18%33%19%
332
September1st to 15thDay
15%215%23%27%15%
315
16th to endDay
17%213%18%26%21%
314
October1st to 15thDay
16%6%24%21%22%7%
315
16th to endDay
22%12%31%23%8%1
282
November1st to 15thDay
22%11%20%22%20%2
135
16th to endDay
28%11%37%18%2
135
December1st to 15thDay
22%22%36%10%6%1
135
16th to endDay
29%20%36%12%1
144
January1st to 15thNight
28%13%36%17%3
780
16th to endNight
23%14%37%21%3
832
February1st to 15thNight
23%12%38%20%4
760
16th to endNight
25%10%34%24%3
631
March1st to 15thNight
24%10%30%25%7%
720
16th to endNight
19%9%32%27%9%
768
April1st to 15thNight
22%10%34%25%6%
629
16th to endNight
19%6%35%24%11%2
540
May1st to 15thNight
23%425%33%10%1
540
16th to endNight
15%224%31%22%3
563
June1st to 15thNight
10%222%43%20%1
540
16th to endNight
12%218%42%22%1
540
July1st to 15thNight
10%117%44%24%1
510
16th to endNight
6%113%39%34%4
564
August1st to 15thNight
8%111%45%28%5%
539
16th to endNight
10%110%34%37%6%
573
September1st to 15thNight
12%314%33%29%5%
696
16th to endNight
16%214%30%28%7%
717
October1st to 15thNight
17%5%23%30%20%2
720
16th to endNight
24%10%31%23%9%
768
November1st to 15thNight
20%8%29%28%11%2
760
16th to endNight
26%11%31%21%8%
780
December1st to 15thNight
28%13%31%20%5%
780
16th to endNight
30%11%34%19%4
832
Page generated at 2018-02-15 10:58:39. Version ac04

Copyright 2018 A. Danko


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