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Brady's Run Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Brady's Run Park clear sky chart from 2005-11-05 to 2017-09-10.

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
35%
15137
15%
46868
10%
15099
41%
15099
19%
32928

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
12%
716
9%
2327
3%
716
18%
716
7%
1902
January16th to endNight
14%
768
9%
2496
4%
768
21%
768
9%
1979
February1st to 15thNight
16%
703
9%
2287
5%
701
22%
701
10%
1796
February16th to endNight
16%
631
11%
1950
4%
631
24%
631
12%
1499
March1st to 15thNight
24%
720
14%
1980
7%
720
30%
720
15%
1513
March16th to endNight
24%
768
18%
2112
9%
768
32%
768
20%
1491
April1st to 15thNight
26%
718
12%
1859
4%
718
31%
718
20%
1376
April16th to endNight
33%
571
19%
1651
8%
571
40%
571
25%
1096
May1st to 15thNight
41%
540
15%
1620
9%
540
47%
540
19%
1135
May16th to endNight
53%
474
17%
1597
16%
474
57%
474
25%
1005
June1st to 15thNight
51%
360
16%
1440
17%
360
59%
360
25%
820
June16th to endNight
52%
360
17%
1440
19%
360
59%
360
23%
856
July1st to 15thNight
57%
448
13%
1468
12%
448
61%
448
26%
933
July16th to endNight
67%
564
16%
1595
14%
531
69%
531
33%
958
August1st to 15thNight
67%
539
20%
1609
16%
536
69%
536
35%
953
August16th to endNight
63%
628
22%
1774
17%
628
65%
628
35%
1080
September1st to 15thNight
59%
700
24%
1812
16%
700
62%
700
34%
1157
September16th to endNight
53%
657
23%
1815
17%
657
57%
657
31%
1164
October1st to 15thNight
45%
660
19%
1973
17%
660
49%
660
24%
1301
October16th to endNight
26%
704
15%
2112
9%
704
36%
704
18%
1510
November1st to 15thNight
41%
700
22%
2232
18%
700
48%
700
25%
1424
November16th to endNight
23%
720
13%
2520
9%
720
31%
720
13%
1825
December1st to 15thNight
18%
720
8%
2520
6%
720
23%
720
8%
2012
December16th to endNight
14%
768
8%
2679
3%
768
20%
768
8%
2143

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
16%9%47%6%35%45%7%30%
47737
Night
16%9%36%5%3445%6%33%
47060
Cloud CoverDay
16%9%46%6%35%45%7%30%
47747
Night
16%9%36%5%3445%6%33%
47064
TransparencyDay
52%5%12%18%9%1
47448
Night
49%5%11%19%11%1
46868
SeeingDay
21%11%24%21%14%6%
5386
Night
21%11%26%26%13%1
15144

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
20%17%7%9%5%25%33319%
1611
16th to endDay
17%18%7%10%7%34335%16%
1728
February1st to 15thDay
18%17%6%10%6%44325%19%
1575
16th to endDay
17%15%410%6%245%45%23%
1520
March1st to 15thDay
20%11%5%8%6%2445%5%25%
1969
16th to endDay
19%10%45%5%35%5%47%28%
2112
April1st to 15thDay
20%10%46%423446%30%
2088
16th to endDay
20%8%35%5%24446%35%
2319
May1st to 15thDay
18%8%36%6%46%5%5%7%27%
2331
16th to endDay
13%435%5%36%5%7%8%35%
2515
June1st to 15thDay
14%6%25%5%25%6%6%9%35%
2520
16th to endDay
14%6%26%5%35%5%6%10%32%
2520
July1st to 15thDay
12%7%37%6%35%5%5%8%35%
2400
16th to endDay
12%436%5%46%7%7%8%34%
2465
August1st to 15thDay
10%5%27%7%47%6%6%9%31%
2340
16th to endDay
11%5%26%6%36%5%6%9%37%
2414
September1st to 15thDay
15%5%35%43445%7%41%
2034
16th to endDay
17%5%35%6%34445%38%
1815
October1st to 15thDay
17%7%26%6%345%5%5%34%
1656
16th to endDay
22%9%36%5%34445%32%
1760
November1st to 15thDay
12%8%35%5%35%5%46%39%
1623
16th to endDay
20%14%5%6%5%24446%25%
1440
December1st to 15thDay
22%17%8%10%5%2423417%
1440
16th to endDay
23%17%7%11%6%4324415%
1542
January1st to 15thNight
22%14%6%10%6%3443319%
2327
16th to endNight
18%15%5%9%8%34335%21%
2496
February1st to 15thNight
18%13%5%10%6%35%44422%
2285
16th to endNight
18%12%411%5%34445%24%
1950
March1st to 15thNight
20%10%5%6%5%34445%27%
1968
16th to endNight
16%10%36%424345%36%
2112
April1st to 15thNight
18%10%36%5%25%35%6%31%
1859
16th to endNight
13%7%36%5%25%35%7%38%
1651
May1st to 15thNight
16%6%35%5%35%5%6%7%32%
1620
16th to endNight
11%5%33425%5%7%9%41%
1595
June1st to 15thNight
9%43442446%10%45%
1440
16th to endNight
9%326%7%35%5%6%9%42%
1440
July1st to 15thNight
7%5%35%6%36%6%6%9%41%
1557
16th to endNight
9%215%5%35%47%10%45%
1703
August1st to 15thNight
7%4144245%8%9%46%
1620
16th to endNight
10%4144245%6%6%49%
1774
September1st to 15thNight
12%413315%45%7%47%
1812
16th to endNight
14%42432435%8%43%
1815
October1st to 15thNight
15%6%25%43345%6%41%
1973
16th to endNight
23%7%25%43445%5%33%
2112
November1st to 15thNight
17%6%2442435%7%40%
2232
16th to endNight
20%12%47%5%33445%27%
2520
December1st to 15thNight
22%15%6%8%6%24335%20%
2520
16th to endNight
22%16%6%8%5%24446%17%
2679

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
20%17%7%9%6%25%33419%
1611
16th to endDay
18%17%8%10%7%43345%16%
1728
February1st to 15thDay
18%18%6%9%6%44335%18%
1575
16th to endDay
17%15%39%7%245%45%23%
1520
March1st to 15thDay
20%11%5%7%6%2445%6%24%
1980
16th to endDay
19%9%45%5%35%5%47%29%
2111
April1st to 15thDay
20%10%46%424446%30%
2088
16th to endDay
20%8%25%5%2445%6%35%
2319
May1st to 15thDay
18%8%36%7%36%5%5%7%27%
2331
16th to endDay
13%425%6%36%5%7%8%34%
2515
June1st to 15thDay
14%5%345%35%6%6%8%35%
2520
16th to endDay
14%6%26%5%35%5%7%10%32%
2520
July1st to 15thDay
12%7%37%6%35%45%8%35%
2400
16th to endDay
11%426%6%46%6%6%9%34%
2465
August1st to 15thDay
10%5%27%7%47%7%6%9%31%
2340
16th to endDay
11%5%26%5%35%5%5%9%36%
2414
September1st to 15thDay
15%6%25%5%2445%8%40%
2034
16th to endDay
17%5%35%6%35%446%38%
1815
October1st to 15thDay
17%7%26%6%345%46%34%
1656
16th to endDay
22%9%36%424445%32%
1760
November1st to 15thDay
12%8%345%35%5%46%39%
1623
16th to endDay
20%14%5%6%5%34346%26%
1440
December1st to 15thDay
22%17%8%10%5%2433417%
1440
16th to endDay
23%17%7%10%6%33335%15%
1542
January1st to 15thNight
22%15%6%10%6%3443319%
2327
16th to endNight
18%14%6%9%7%4434421%
2496
February1st to 15thNight
17%12%6%9%6%45%445%22%
2278
16th to endNight
17%12%410%5%3445%5%24%
1950
March1st to 15thNight
21%10%47%5%34446%27%
1980
16th to endNight
16%10%36%5%24345%36%
2112
April1st to 15thNight
18%10%35%5%3445%6%32%
1859
16th to endNight
13%7%36%5%2435%7%39%
1651
May1st to 15thNight
15%7%35%5%35%5%6%8%32%
1619
16th to endNight
11%5%24435%5%6%9%41%
1595
June1st to 15thNight
9%3345%245%6%9%45%
1440
16th to endNight
9%326%6%345%5%9%42%
1440
July1st to 15thNight
7%426%5%36%5%5%8%42%
1557
16th to endNight
8%31443447%10%45%
1703
August1st to 15thNight
7%415%4245%7%9%47%
1620
16th to endNight
10%4144245%6%7%48%
1774
September1st to 15thNight
13%413425%45%7%48%
1812
16th to endNight
14%5%25%32445%8%43%
1815
October1st to 15thNight
15%6%25%43445%6%41%
1973
16th to endNight
23%7%25%5%2445%5%33%
2112
November1st to 15thNight
17%6%2442345%7%41%
2232
16th to endNight
20%12%47%5%24445%28%
2520
December1st to 15thNight
22%15%7%8%6%24335%20%
2520
16th to endNight
22%16%6%8%5%3435%6%18%
2679

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
69%310%11%4
1612
16th to endDay
70%312%10%2
1728
February1st to 15thDay
69%49%11%4
1577
16th to endDay
61%412%14%6%
1520
March1st to 15thDay
59%6%11%16%5%
1980
16th to endDay
53%5%11%18%9%
2112
April1st to 15thDay
54%311%18%11%
2088
16th to endDay
49%49%18%13%3
2319
May1st to 15thDay
53%6%11%18%8%1
2331
16th to endDay
44%7%16%19%9%1
2519
June1st to 15thDay
44%7%13%23%10%
2520
16th to endDay
45%7%13%21%10%
2520
July1st to 15thDay
47%5%11%18%13%2
2261
16th to endDay
42%8%12%22%12%
2310
August1st to 15thDay
44%7%14%23%9%
2327
16th to endDay
41%7%12%22%12%3
2414
September1st to 15thDay
41%5%10%23%15%2
2034
16th to endDay
46%49%22%15%
1815
October1st to 15thDay
48%5%11%19%14%
1656
16th to endDay
53%314%18%8%
1760
November1st to 15thDay
45%411%21%13%3
1623
16th to endDay
59%312%15%7%1
1440
December1st to 15thDay
71%49%10%3
1440
16th to endDay
72%410%10%2
1542
January1st to 15thNight
69%48%13%4
2327
16th to endNight
65%411%13%4
2496
February1st to 15thNight
63%411%15%5%
2287
16th to endNight
60%410%17%6%
1950
March1st to 15thNight
57%411%17%7%
1980
16th to endNight
49%412%20%11%2
2112
April1st to 15thNight
52%410%16%14%
1859
16th to endNight
43%411%19%14%5%
1651
May1st to 15thNight
47%7%9%19%13%1
1620
16th to endNight
37%9%13%22%14%2
1597
June1st to 15thNight
33%8%15%26%15%
1440
16th to endNight
38%7%14%21%16%2
1440
July1st to 15thNight
37%8%12%20%17%2
1468
16th to endNight
31%7%15%24%15%4
1595
August1st to 15thNight
29%8%15%26%19%
1609
16th to endNight
32%6%12%27%16%4
1774
September1st to 15thNight
34%6%10%23%20%4
1812
16th to endNight
37%5%9%26%19%1
1815
October1st to 15thNight
42%6%12%23%14%2
1973
16th to endNight
51%412%21%8%1
2112
November1st to 15thNight
42%312%21%14%5%
2232
16th to endNight
57%310%18%8%1
2520
December1st to 15thNight
67%411%11%4
2520
16th to endNight
67%412%13%2
2679

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
28%25%31%5%6%2
90
16th to endDay
32%35%25%6%1
96
February1st to 15thDay
31%31%34%3
90
16th to endDay
25%22%38%12%1
88
March1st to 15thDay
31%16%29%17%5%
270
16th to endDay
27%18%29%15%6%2
288
April1st to 15thDay
29%14%27%17%10%1
270
16th to endDay
24%9%31%15%12%5%
270
May1st to 15thDay
28%17%23%17%8%3
288
16th to endDay
18%11%25%22%13%8%
331
June1st to 15thDay
15%10%24%25%20%3
315
16th to endDay
18%9%26%29%11%5%
315
July1st to 15thDay
20%5%22%25%15%9%
305
16th to endDay
12%219%26%27%11%
326
August1st to 15thDay
15%319%24%23%14%
313
16th to endDay
13%317%24%23%17%
332
September1st to 15thDay
17%417%26%21%12%
294
16th to endDay
19%7%16%22%26%8%
254
October1st to 15thDay
17%6%24%28%19%4
255
16th to endDay
24%13%33%20%8%
272
November1st to 15thDay
20%10%23%23%19%2
139
16th to endDay
26%18%38%8%6%1
60
December1st to 15thDay
30%28%20%11%5%5%
60
16th to endDay
44%21%23%10%
65
January1st to 15thNight
32%19%30%15%2
720
16th to endNight
25%21%32%19%2
768
February1st to 15thNight
27%19%31%20%2
704
16th to endNight
27%16%34%19%2
631
March1st to 15thNight
28%17%25%24%4
720
16th to endNight
22%14%33%21%7%1
768
April1st to 15thNight
26%14%30%22%6%
718
16th to endNight
18%8%34%28%8%1
571
May1st to 15thNight
20%9%23%35%9%1
540
16th to endNight
14%324%32%21%3
476
June1st to 15thNight
10%327%38%18%
360
16th to endNight
9%228%33%24%
360
July1st to 15thNight
8%24%39%24%3
448
16th to endNight
9%213%39%31%3
564
August1st to 15thNight
10%14%40%28%4
539
16th to endNight
11%215%32%32%4
628
September1st to 15thNight
15%416%32%29%3
700
16th to endNight
16%5%19%25%27%5%
657
October1st to 15thNight
19%7%23%27%19%1
660
16th to endNight
29%12%28%21%6%
704
November1st to 15thNight
21%9%24%30%14%
700
16th to endNight
28%17%25%19%8%
720
December1st to 15thNight
33%16%24%20%5%
720
16th to endNight
32%17%30%18%1
768
Page generated at 2017-09-11 19:35:31. Version ac04

Copyright 2017 A. Danko


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