Betelgeuse Bar & Grill
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Betelgeuse Bar & Grill clear sky chart from 2005-11-05 to 2017-03-14.

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
37%
14273
16%
45175
10%
14237
43%
14237
21%
30398

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
18%
718
11%
2479
5%
716
28%
716
11%
1888
January16th to endNight
22%
768
15%
2496
6%
768
33%
768
14%
1868
February1st to 15thNight
20%
701
12%
2287
4%
701
29%
701
13%
1686
February16th to endNight
26%
631
15%
2017
7%
631
37%
631
17%
1426
March1st to 15thNight
24%
716
15%
1969
7%
716
31%
716
18%
1443
March16th to endNight
33%
704
22%
1936
12%
704
42%
704
27%
1276
April1st to 15thNight
27%
658
17%
1665
5%
658
34%
658
23%
1192
April16th to endNight
40%
517
21%
1507
9%
517
48%
517
28%
968
May1st to 15thNight
48%
446
19%
1436
13%
446
56%
446
26%
901
May16th to endNight
50%
342
18%
1369
17%
342
59%
342
29%
710
June1st to 15thNight
42%
330
15%
1320
13%
330
53%
330
21%
756
June16th to endNight
53%
330
13%
1269
16%
330
60%
330
28%
703
July1st to 15thNight
64%
310
18%
1240
25%
310
70%
310
37%
601
July16th to endNight
63%
446
16%
1395
15%
415
65%
415
35%
766
August1st to 15thNight
68%
494
20%
1474
16%
491
71%
491
40%
827
August16th to endNight
64%
573
23%
1623
15%
573
68%
573
38%
936
September1st to 15thNight
55%
660
23%
1655
11%
660
60%
660
36%
1051
September16th to endNight
56%
657
23%
1840
15%
657
59%
657
35%
1118
October1st to 15thNight
41%
660
19%
1980
16%
660
48%
660
24%
1333
October16th to endNight
28%
704
13%
2112
7%
704
37%
704
18%
1535
November1st to 15thNight
38%
700
20%
2378
17%
700
45%
700
21%
1545
November16th to endNight
29%
720
12%
2520
8%
720
35%
720
14%
1817
December1st to 15thNight
19%
720
9%
2520
5%
720
25%
720
11%
1928
December16th to endNight
16%
768
8%
2688
3%
768
23%
768
10%
2124

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
14%8%37%6%35%5%5%7%32%
45477
Night
15%8%36%5%3445%6%35%
45355
Cloud CoverDay
15%7%36%6%35%5%5%7%33%
45487
Night
15%8%36%5%3445%6%35%
45359
TransparencyDay
49%412%21%10%1
45175
Night
48%312%22%11%1
45175
SeeingDay
17%5%25%27%17%7%
4607
Night
19%6%27%31%13%1
14279

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
17%11%5%9%7%35%45%6%23%
1456
16th to endDay
12%14%6%11%8%47%5%5%6%17%
1728
February1st to 15thDay
14%14%6%11%7%45%445%21%
1575
16th to endDay
17%12%5%8%6%34445%27%
1455
March1st to 15thDay
15%9%48%7%45%5%46%28%
1952
16th to endDay
15%8%36%7%345%5%436%
1936
April1st to 15thDay
20%9%46%42445%6%30%
1953
16th to endDay
18%7%35%424445%38%
2131
May1st to 15thDay
13%7%37%6%345%5%7%35%
2185
16th to endDay
11%5%35%5%345%5%8%41%
2394
June1st to 15thDay
15%6%25%5%246%6%9%34%
2310
16th to endDay
12%425%436%5%7%9%36%
2310
July1st to 15thDay
8%4346%36%6%6%8%40%
2310
16th to endDay
10%5%26%7%36%6%7%9%36%
2357
August1st to 15thDay
8%5%36%6%35%5%6%10%39%
2145
16th to endDay
10%6%25%5%35%5%7%8%39%
2215
September1st to 15thDay
15%5%35%5%345%5%6%39%
1972
16th to endDay
14%6%36%5%35%45%7%39%
1790
October1st to 15thDay
19%7%26%5%3445%6%34%
1650
16th to endDay
24%10%36%6%445%5%5%23%
1760
November1st to 15thDay
14%9%48%6%2446%8%31%
1477
16th to endDay
17%12%5%8%5%25%6%5%7%22%
1440
December1st to 15thDay
19%12%6%11%6%35%5%6%6%17%
1440
16th to endDay
20%11%6%9%6%45%5%5%6%17%
1536
January1st to 15thNight
20%13%49%6%3445%6%21%
2479
16th to endNight
14%11%6%9%7%45%45%5%24%
2496
February1st to 15thNight
14%13%5%9%6%35%5%46%25%
2285
16th to endNight
14%10%48%7%3445%6%29%
2017
March1st to 15thNight
17%8%47%7%35%34432%
1957
16th to endNight
13%8%36%423335%44%
1936
April1st to 15thNight
18%6%45%435%445%35%
1665
16th to endNight
13%6%36%5%2335%6%43%
1507
May1st to 15thNight
14%4345%35%5%5%8%39%
1436
16th to endNight
11%32331436%7%50%
1367
June1st to 15thNight
14%5%24425%45%8%41%
1320
16th to endNight
10%425%435%46%8%44%
1269
July1st to 15thNight
43144245%5%7%56%
1320
16th to endNight
7%323425%47%8%49%
1500
August1st to 15thNight
7%42442446%9%49%
1485
16th to endNight
8%41442445%6%52%
1623
September1st to 15thNight
12%42342445%7%47%
1655
16th to endNight
12%5%2441345%7%47%
1840
October1st to 15thNight
18%6%35%5%24447%37%
1980
16th to endNight
20%8%36%6%3446%6%28%
2112
November1st to 15thNight
16%7%35%5%35%5%5%6%36%
2378
16th to endNight
21%9%37%5%35%5%5%6%26%
2520
December1st to 15thNight
19%14%5%7%5%35%446%21%
2520
16th to endNight
21%12%5%8%8%46%5%5%6%16%
2688

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%11%5%8%7%35%446%24%
1456
16th to endDay
13%13%6%11%8%47%5%5%5%18%
1728
February1st to 15thDay
14%14%6%11%7%45%345%22%
1575
16th to endDay
17%12%5%8%6%34445%27%
1455
March1st to 15thDay
16%9%48%8%445%45%28%
1963
16th to endDay
15%8%46%6%3445%436%
1935
April1st to 15thDay
21%8%47%42435%6%31%
1953
16th to endDay
18%7%26%434446%38%
2131
May1st to 15thDay
13%7%36%6%35%46%7%36%
2185
16th to endDay
11%5%26%5%345%5%7%42%
2394
June1st to 15thDay
15%6%25%5%346%7%8%35%
2310
16th to endDay
13%315%5%35%5%7%9%37%
2310
July1st to 15thDay
8%4345%46%6%6%8%41%
2310
16th to endDay
10%5%26%6%45%6%7%8%37%
2357
August1st to 15thDay
8%436%6%45%5%6%9%40%
2145
16th to endDay
10%6%25%425%5%7%8%40%
2215
September1st to 15thDay
16%5%344245%5%6%40%
1972
16th to endDay
14%5%36%5%34447%39%
1790
October1st to 15thDay
19%7%35%5%24446%34%
1650
16th to endDay
24%10%37%6%35%5%6%423%
1760
November1st to 15thDay
14%8%47%6%2446%8%31%
1477
16th to endDay
18%12%5%7%6%246%5%7%23%
1440
December1st to 15thDay
19%12%6%10%7%25%5%5%6%17%
1440
16th to endDay
21%11%6%8%7%445%5%6%18%
1536
January1st to 15thNight
20%13%39%6%3445%6%22%
2479
16th to endNight
14%11%6%9%7%45%45%5%25%
2496
February1st to 15thNight
14%13%5%8%6%35%45%5%26%
2278
16th to endNight
14%10%48%7%25%45%5%29%
2017
March1st to 15thNight
19%7%47%6%35%335%31%
1969
16th to endNight
14%8%36%42333443%
1936
April1st to 15thNight
18%7%35%5%35%445%35%
1665
16th to endNight
13%6%36%5%24346%43%
1507
May1st to 15thNight
14%4245%245%5%8%39%
1435
16th to endNight
11%32432345%7%50%
1367
June1st to 15thNight
15%5%24335%35%9%41%
1320
16th to endNight
10%42442446%9%44%
1269
July1st to 15thNight
43134245%5%7%56%
1320
16th to endNight
7%31443446%9%49%
1500
August1st to 15thNight
7%31442446%9%49%
1485
16th to endNight
9%41433445%6%53%
1623
September1st to 15thNight
12%424334447%47%
1655
16th to endNight
13%415%42345%7%48%
1840
October1st to 15thNight
18%6%26%5%2335%6%38%
1980
16th to endNight
21%8%36%6%35%5%5%6%28%
2112
November1st to 15thNight
16%6%35%5%26%46%6%36%
2378
16th to endNight
21%9%46%5%35%5%6%6%26%
2520
December1st to 15thNight
20%13%5%6%6%35%45%6%22%
2520
16th to endNight
21%12%5%8%8%35%5%46%17%
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
61%312%15%7%
1457
16th to endDay
66%38%13%6%
1728
February1st to 15thDay
65%29%16%5%
1577
16th to endDay
58%211%18%7%1
1455
March1st to 15thDay
56%312%18%8%
1963
16th to endDay
49%310%20%14%1
1936
April1st to 15thDay
52%310%20%12%
1953
16th to endDay
47%29%22%15%2
2131
May1st to 15thDay
45%410%23%14%1
2185
16th to endDay
39%414%23%15%1
2398
June1st to 15thDay
44%5%13%24%12%
2310
16th to endDay
40%5%15%23%14%
2310
July1st to 15thDay
36%5%10%28%17%2
2161
16th to endDay
42%5%14%23%12%1
2199
August1st to 15thDay
38%415%23%15%2
2132
16th to endDay
39%413%30%10%1
2215
September1st to 15thDay
42%5%14%26%10%
1972
16th to endDay
44%312%29%9%
1790
October1st to 15thDay
50%311%22%10%1
1650
16th to endDay
60%415%14%4
1760
November1st to 15thDay
50%414%20%8%1
1477
16th to endDay
59%414%15%5%
1440
December1st to 15thDay
65%414%13%2
1440
16th to endDay
65%412%15%3
1536
January1st to 15thNight
63%210%14%7%1
2479
16th to endNight
60%310%19%6%1
2496
February1st to 15thNight
58%39%20%7%
2287
16th to endNight
54%212%21%8%
2017
March1st to 15thNight
55%211%21%7%
1969
16th to endNight
43%29%25%16%2
1936
April1st to 15thNight
50%39%20%15%1
1665
16th to endNight
42%29%23%18%3
1507
May1st to 15thNight
40%410%25%16%2
1436
16th to endNight
32%314%28%17%3
1369
June1st to 15thNight
40%310%26%16%1
1320
16th to endNight
36%313%26%19%1
1269
July1st to 15thNight
25%411%30%25%3
1240
16th to endNight
30%416%27%17%3
1395
August1st to 15thNight
29%419%29%15%1
1474
16th to endNight
31%311%35%16%1
1623
September1st to 15thNight
35%313%31%14%
1655
16th to endNight
35%312%34%13%
1840
October1st to 15thNight
46%410%25%13%
1980
16th to endNight
55%313%19%8%
2112
November1st to 15thNight
47%212%22%13%1
2378
16th to endNight
56%315%17%5%
2520
December1st to 15thNight
63%312%16%4
2520
16th to endNight
67%312%13%4
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
17%14%40%18%9%
64
16th to endDay
29%11%33%20%5%
96
February1st to 15thDay
17%16%46%16%2
90
16th to endDay
21%12%38%24%2
93
March1st to 15thDay
21%9%35%23%10%
264
16th to endDay
20%7%29%28%10%3
224
April1st to 15thDay
22%7%32%25%10%1
210
16th to endDay
21%6%23%25%17%6%
210
May1st to 15thDay
16%424%25%15%12%
228
16th to endDay
14%326%28%19%7%
267
June1st to 15thDay
19%5%22%30%18%3
255
16th to endDay
14%318%34%21%6%
255
July1st to 15thDay
8%119%31%27%10%
245
16th to endDay
8%320%35%21%11%
270
August1st to 15thDay
7%118%29%26%16%
253
16th to endDay
14%111%24%28%18%
268
September1st to 15thDay
15%118%23%23%16%
255
16th to endDay
17%316%29%20%12%
254
October1st to 15thDay
17%425%27%17%7%
255
16th to endDay
25%9%30%26%7%
272
November1st to 15thDay
15%9%22%32%16%3
95
16th to endDay
25%10%33%25%6%
60
December1st to 15thDay
18%16%38%16%8%1
60
16th to endDay
23%18%43%12%1
64
January1st to 15thNight
28%11%32%21%5%
720
16th to endNight
19%7%34%30%7%
768
February1st to 15thNight
20%10%36%27%5%
704
16th to endNight
18%10%33%30%7%
631
March1st to 15thNight
23%9%32%27%6%
716
16th to endNight
18%8%31%27%12%1
704
April1st to 15thNight
21%10%33%28%6%
658
16th to endNight
15%7%29%34%11%1
517
May1st to 15thNight
16%224%34%18%2
446
16th to endNight
12%325%37%20%1
343
June1st to 15thNight
16%5%26%33%17%
330
16th to endNight
11%221%43%19%1
330
July1st to 15thNight
5%19%47%23%2
310
16th to endNight
7%118%46%23%3
446
August1st to 15thNight
8%11%45%30%2
494
16th to endNight
11%214%37%30%4
573
September1st to 15thNight
15%320%30%26%5%
660
16th to endNight
14%317%33%27%4
657
October1st to 15thNight
21%422%31%16%2
660
16th to endNight
24%6%28%32%8%
704
November1st to 15thNight
20%5%28%29%13%1
700
16th to endNight
26%8%26%27%9%1
720
December1st to 15thNight
27%9%34%23%5%
720
16th to endNight
27%6%36%24%4
768
Page generated at 2017-03-15 11:32:41. Version ac04

Copyright 2017 A. Danko


Betelgeuse Bar & Grill Clear Sky Chart | Charts Home