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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 2018-03-11.

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%
15865
15%
49173
10%
15827
40%
15827
19%
34515

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
13%
776
10%
2522
3%
776
19%
776
8%
2029
January16th to endNight
15%
832
9%
2704
4%
832
21%
832
9%
2126
February1st to 15thNight
15%
763
9%
2482
5%
761
21%
761
10%
1965
February16th to endNight
16%
683
10%
2110
4%
683
23%
683
12%
1632
March1st to 15thNight
23%
764
15%
2101
7%
764
30%
764
16%
1584
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%
720
24%
1867
15%
720
62%
720
34%
1197
September16th to endNight
55%
717
25%
1980
19%
717
59%
717
33%
1238
October1st to 15thNight
45%
720
18%
2153
16%
720
49%
720
24%
1426
October16th to endNight
28%
768
17%
2304
11%
768
37%
768
19%
1628
November1st to 15thNight
41%
760
21%
2423
17%
760
47%
760
24%
1556
November16th to endNight
23%
780
14%
2730
9%
780
31%
780
13%
1950
December1st to 15thNight
19%
780
8%
2730
5%
780
23%
780
9%
2163
December16th to endNight
14%
832
8%
2902
3%
832
20%
832
8%
2318

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%
49432
Night
16%9%36%5%3445%6%33%
49365
Cloud CoverDay
16%9%46%6%35%5%5%7%30%
49442
Night
16%9%36%5%3445%6%33%
49369
TransparencyDay
52%5%11%18%9%1
49143
Night
49%5%11%19%11%1
49173
SeeingDay
21%11%25%20%14%6%
5952
Night
21%11%26%25%13%1
15872

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%16%6%9%6%35%44419%
1746
16th to endDay
17%18%7%10%7%33335%18%
1872
February1st to 15thDay
19%17%6%9%7%44325%19%
1710
16th to endDay
19%14%49%6%245%45%23%
1646
March1st to 15thDay
20%11%5%8%6%2435%5%25%
2085
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%4345%5%6%40%
2091
16th to endDay
16%5%25%6%34445%40%
1980
October1st to 15thDay
18%7%25%6%345%45%34%
1806
16th to endDay
22%9%36%5%34445%32%
1920
November1st to 15thDay
13%8%35%5%35%5%45%37%
1761
16th to endDay
19%13%5%6%42445%6%27%
1560
December1st to 15thDay
20%16%8%10%6%25%33417%
1560
16th to endDay
22%17%6%11%7%3323415%
1671
January1st to 15thNight
22%14%6%9%6%4443320%
2522
16th to endNight
18%15%5%9%8%44335%22%
2704
February1st to 15thNight
19%13%5%10%6%35%44421%
2480
16th to endNight
19%12%410%5%34445%23%
2110
March1st to 15thNight
19%10%5%6%5%24445%29%
2089
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
13%414315%45%7%47%
1867
16th to endNight
13%42432435%8%45%
1980
October1st to 15thNight
15%6%25%5%33446%41%
2153
16th to endNight
22%7%25%42445%5%34%
2304
November1st to 15thNight
17%6%2442435%7%40%
2423
16th to endNight
19%11%47%5%335%46%28%
2730
December1st to 15thNight
21%15%6%8%6%24345%21%
2730
16th to endNight
21%16%6%8%5%24346%18%
2902

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%16%6%9%6%35%43419%
1746
16th to endDay
17%17%8%10%7%43345%17%
1872
February1st to 15thDay
18%17%6%9%7%44335%18%
1710
16th to endDay
19%15%39%6%24445%23%
1646
March1st to 15thDay
20%11%5%7%6%2445%5%25%
2096
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%7%39%
2091
16th to endDay
16%5%35%6%35%446%40%
1980
October1st to 15thDay
18%7%26%6%245%46%34%
1806
16th to endDay
22%8%36%424445%32%
1920
November1st to 15thDay
13%8%445%35%5%46%37%
1761
16th to endDay
19%13%46%5%34446%27%
1560
December1st to 15thDay
20%16%8%10%5%3433417%
1560
16th to endDay
22%17%7%11%7%33335%15%
1671
January1st to 15thNight
22%14%6%9%6%3443320%
2522
16th to endNight
18%14%5%9%7%4434422%
2704
February1st to 15thNight
19%12%6%10%6%35%445%21%
2473
16th to endNight
19%12%410%5%34445%24%
2110
March1st to 15thNight
20%10%47%5%34446%29%
2101
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%41332445%7%47%
1867
16th to endNight
13%425%32446%8%45%
1980
October1st to 15thNight
15%6%25%5%24446%41%
2153
16th to endNight
22%6%25%5%2445%5%34%
2304
November1st to 15thNight
17%6%2442445%7%40%
2423
16th to endNight
19%11%37%5%24445%29%
2730
December1st to 15thNight
21%14%6%9%6%24335%21%
2730
16th to endNight
21%16%6%8%5%33346%18%
2902

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
68%410%11%5%
1747
16th to endDay
69%412%11%2
1872
February1st to 15thDay
69%49%11%4
1712
16th to endDay
61%412%14%6%
1646
March1st to 15thDay
59%5%11%17%6%
2096
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
42%5%10%23%15%2
2091
16th to endDay
44%5%9%24%15%
1980
October1st to 15thDay
48%411%18%15%
1806
16th to endDay
52%414%19%9%
1920
November1st to 15thDay
46%411%20%13%3
1761
16th to endDay
57%412%16%7%1
1560
December1st to 15thDay
70%49%11%3
1560
16th to endDay
72%410%9%2
1671
January1st to 15thNight
67%48%14%4
2522
16th to endNight
65%312%13%4
2704
February1st to 15thNight
64%410%14%5%
2482
16th to endNight
61%410%16%6%
2110
March1st to 15thNight
56%411%18%8%
2101
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%22%20%4
1867
16th to endNight
35%5%10%26%20%1
1980
October1st to 15thNight
42%6%11%21%14%2
2153
16th to endNight
50%411%21%9%1
2304
November1st to 15thNight
43%312%21%13%4
2423
16th to endNight
56%311%19%7%
2730
December1st to 15thNight
65%411%12%4
2730
16th to endNight
67%412%13%2
2902

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
24%24%34%8%5%1
135
16th to endDay
27%31%32%6%1
144
February1st to 15thDay
34%27%34%2
135
16th to endDay
32%22%34%9%
128
March1st to 15thDay
31%16%31%16%4
312
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%
315
16th to endDay
15%7%14%20%26%14%
314
October1st to 15thDay
21%5%22%26%19%4
315
16th to endDay
24%13%31%20%8%1
336
November1st to 15thDay
22%11%27%21%14%1
187
16th to endDay
22%23%35%12%5%1
90
December1st to 15thDay
25%27%23%15%43
90
16th to endDay
36%23%29%10%
98
January1st to 15thNight
31%18%32%15%2
780
16th to endNight
25%20%32%19%2
832
February1st to 15thNight
28%18%30%19%2
764
16th to endNight
28%15%34%19%2
683
March1st to 15thNight
27%17%26%24%3
764
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%415%31%29%3
720
16th to endNight
15%5%18%23%28%7%
717
October1st to 15thNight
19%7%22%28%20%1
720
16th to endNight
28%12%27%21%8%
768
November1st to 15thNight
21%9%23%30%14%
760
16th to endNight
27%17%26%19%8%
780
December1st to 15thNight
31%16%25%20%5%
780
16th to endNight
31%17%31%18%1
832
Page generated at 2018-03-12 13:28:13. Version ac04

Copyright 2018 A. Danko


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