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 2005-11-06 to 2024-01-15.

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
34%
23360
15%
74911
10%
23310
40%
23310
18%
53003

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 10thNight
12%
757
10%
2459
3%
757
20%
757
8%
1967
January11th to 20thNight
13%
739
7%
2399
3%
739
19%
739
8%
1960
January21st to endNight
16%
792
10%
2574
5%
792
23%
792
9%
2045
February1st to 10thNight
17%
720
10%
2340
5%
720
23%
720
10%
1840
February11th to 20thNight
13%
702
10%
2275
4%
700
19%
700
10%
1754
February21st to endNight
15%
592
12%
1773
4%
592
23%
592
11%
1398
March1st to 10thNight
20%
720
16%
1980
7%
720
28%
720
17%
1448
March11th to 20thNight
26%
720
18%
1980
10%
720
33%
720
19%
1413
March21st to endNight
23%
792
17%
2178
8%
792
31%
792
18%
1599
April1st to 10thNight
26%
720
14%
1896
5%
720
31%
720
20%
1360
April11th to 20thNight
31%
671
17%
1735
7%
671
36%
671
23%
1232
April21st to endNight
26%
540
19%
1620
8%
540
34%
540
22%
1092
May1st to 10thNight
38%
540
13%
1620
7%
540
43%
540
18%
1141
May11th to 20thNight
39%
531
16%
1592
10%
531
45%
531
21%
1109
May21st to endNight
55%
454
18%
1617
16%
454
61%
454
27%
962
June1st to 10thNight
51%
360
16%
1440
16%
360
59%
360
24%
845
June11th to 20thNight
51%
360
17%
1440
20%
360
57%
360
22%
846
June21st to endNight
53%
360
18%
1440
21%
360
60%
360
24%
848
July1st to 10thNight
60%
430
14%
1480
15%
430
63%
430
26%
919
July11th to 20thNight
63%
522
18%
1566
17%
522
66%
522
34%
935
July21st to endNight
62%
591
15%
1672
13%
558
64%
558
27%
1083
August1st to 10thNight
64%
537
18%
1600
15%
534
66%
534
32%
982
August11th to 20thNight
63%
534
20%
1598
17%
534
65%
534
30%
998
August21st to endNight
57%
676
21%
1864
14%
676
59%
676
32%
1178
September1st to 10thNight
58%
720
23%
1810
14%
720
61%
720
35%
1169
September11th to 20thNight
64%
720
26%
1980
19%
720
68%
720
38%
1187
September21st to endNight
45%
720
22%
1980
15%
720
51%
720
28%
1307
October1st to 10thNight
47%
720
19%
2148
17%
720
52%
720
27%
1380
October11th to 20thNight
31%
720
16%
2160
10%
720
40%
720
21%
1473
October21st to endNight
29%
792
19%
2376
12%
792
38%
792
18%
1700
November1st to 10thNight
40%
740
22%
2320
17%
740
47%
740
26%
1462
November11th to 20thNight
26%
760
16%
2578
11%
760
35%
760
16%
1797
November21st to endNight
23%
760
14%
2660
10%
760
32%
760
13%
1924
December1st to 10thNight
17%
760
8%
2660
5%
760
22%
760
8%
2119
December11th to 20thNight
18%
759
9%
3252
6%
759
24%
759
7%
2491
December21st to endNight
15%
829
5%
4849
4%
817
22%
817
4%
4040

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%10%47%6%45%5%5%7%31%
74604
Night
17%10%47%6%3445%7%33%
75170
TransparencyDay
52%6%12%19%10%1
74325
Night
51%6%12%19%11%2
74969
SeeingDay
22%15%28%20%11%4
13548
Night
22%12%26%27%12%1
23374

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 10thDay
18%16%9%10%8%46%435%18%
1706
11th to 20thDay
18%20%7%12%7%3443417%
1656
21st to endDay
17%17%8%12%8%445%45%15%
1782
February1st to 10thDay
20%17%6%10%8%45%33420%
1620
11th to 20thDay
18%13%6%13%7%44445%20%
1573
21st to endDay
20%15%48%7%35%445%24%
1480
March1st to 10thDay
17%10%5%8%7%3445%7%30%
1980
11th to 20thDay
18%11%48%6%445%46%29%
1980
21st to endDay
21%10%47%6%35%5%5%6%27%
2178
April1st to 10thDay
15%10%5%8%5%345%6%7%31%
2062
11th to 20thDay
17%10%46%6%35%5%5%6%33%
2190
21st to endDay
22%9%36%5%35%45%6%32%
2340
May1st to 10thDay
18%9%36%7%46%6%5%7%29%
2340
11th to 20thDay
20%7%37%7%45%5%6%6%29%
2301
21st to endDay
11%5%25%6%46%6%8%10%37%
2655
June1st to 10thDay
14%7%37%6%45%6%6%8%34%
2520
11th to 20thDay
14%7%36%5%45%5%7%9%35%
2520
21st to endDay
13%5%25%6%35%6%7%10%37%
2520
July1st to 10thDay
10%7%37%6%45%5%6%8%40%
2430
11th to 20thDay
11%6%36%5%45%6%7%9%37%
2340
21st to endDay
11%5%36%7%47%7%6%9%35%
2547
August1st to 10thDay
10%5%36%7%5%7%7%7%9%35%
2327
11th to 20thDay
12%6%38%7%45%7%6%9%33%
2303
21st to endDay
10%6%37%6%46%6%6%9%37%
2472
September1st to 10thDay
16%6%25%5%3445%8%42%
2146
11th to 20thDay
11%5%25%6%35%5%7%10%41%
1980
21st to endDay
17%7%37%7%35%45%6%37%
1980
October1st to 10thDay
15%7%25%6%35%6%5%9%37%
1811
11th to 20thDay
20%8%37%6%45%45%5%33%
1800
21st to endDay
23%11%37%5%3445%6%29%
1980
November1st to 10thDay
11%9%35%6%45%5%5%5%42%
1754
11th to 20thDay
18%12%47%6%345%47%31%
1600
21st to endDay
17%14%7%7%6%35%5%5%6%26%
1520
December1st to 10thDay
21%17%8%10%6%4444418%
1520
11th to 20thDay
20%15%8%12%5%3435%5%20%
1910
21st to endDay
26%22%7%10%6%33345%12%
2781
January1st to 10thNight
18%17%6%10%6%45%5%4420%
2459
11th to 20thNight
22%15%5%11%8%4444419%
2399
21st to endNight
18%17%7%10%7%4444422%
2574
February1st to 10thNight
21%13%6%10%7%3445%5%22%
2340
11th to 20thNight
20%12%6%11%7%45%445%24%
2273
21st to endNight
21%12%5%11%6%35%5%5%424%
1773
March1st to 10thNight
18%10%47%6%345%5%6%32%
1980
11th to 20thNight
20%9%47%6%24447%34%
1980
21st to endNight
18%12%47%5%34445%33%
2178
April1st to 10thNight
17%10%46%6%3435%6%35%
1896
11th to 20thNight
16%8%36%6%45%45%7%36%
1735
21st to endNight
16%9%37%5%3446%9%35%
1620
May1st to 10thNight
17%9%36%6%35%6%6%8%32%
1620
11th to 20thNight
16%8%36%5%35%5%6%8%36%
1592
21st to endNight
9%5%24435%6%6%11%44%
1616
June1st to 10thNight
9%5%36%5%35%6%5%9%43%
1440
11th to 20thNight
12%5%35%6%3445%10%42%
1440
21st to endNight
9%326%7%35%5%6%9%44%
1440
July1st to 10thNight
6%6%27%6%36%5%5%8%45%
1524
11th to 20thNight
8%4245%45%5%7%9%46%
1620
21st to endNight
10%5%26%6%45%6%7%10%39%
1771
August1st to 10thNight
6%5%36%5%35%6%7%9%46%
1611
11th to 20thNight
9%7%26%5%3446%8%45%
1598
21st to endNight
11%5%25%5%345%7%8%45%
1864
September1st to 10thNight
13%5%245%25%5%5%7%48%
1810
11th to 20thNight
10%5%234345%6%9%51%
1980
21st to endNight
15%7%26%43445%8%41%
1980
October1st to 10thNight
14%6%35%434447%45%
2148
11th to 20thNight
18%7%36%6%245%5%6%37%
2160
21st to endNight
24%9%35%424446%34%
2376
November1st to 10thNight
14%7%35%5%3345%6%44%
2320
11th to 20thNight
18%11%47%6%35%5%5%6%31%
2578
21st to endNight
19%13%5%8%5%345%5%5%29%
2660
December1st to 10thNight
22%16%8%9%6%24445%20%
2660
11th to 20thNight
19%18%6%9%6%34446%22%
3285
21st to endNight
26%18%7%9%7%34445%13%
4870

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 10thDay
69%411%11%4
1707
11th to 20thDay
71%411%11%2
1656
21st to endDay
71%5%9%11%31
1782
February1st to 10thDay
69%39%12%6%
1620
11th to 20thDay
66%5%9%14%6%
1582
21st to endDay
61%411%15%7%1
1480
March1st to 10thDay
53%5%12%21%7%
1980
11th to 20thDay
55%5%11%17%10%1
1980
21st to endDay
57%5%9%17%10%1
2178
April1st to 10thDay
52%5%11%19%11%2
2062
11th to 20thDay
51%6%10%17%14%2
2190
21st to endDay
52%5%10%21%10%2
2340
May1st to 10thDay
53%7%12%18%9%2
2340
11th to 20thDay
53%7%11%15%11%2
2305
21st to endDay
40%8%18%23%9%2
2655
June1st to 10thDay
46%7%13%22%11%1
2520
11th to 20thDay
45%7%14%21%12%1
2520
21st to endDay
41%8%12%26%12%1
2520
July1st to 10thDay
43%7%13%21%14%3
2365
11th to 20thDay
41%7%13%24%14%1
2271
21st to endDay
41%10%13%22%13%1
2405
August1st to 10thDay
42%8%15%26%9%
2314
11th to 20thDay
44%8%14%23%9%1
2303
21st to endDay
41%9%12%22%13%3
2472
September1st to 10thDay
40%6%11%21%18%3
2146
11th to 20thDay
37%6%14%27%14%1
1980
21st to endDay
47%5%11%23%14%1
1980
October1st to 10thDay
42%6%13%22%16%1
1811
11th to 20thDay
52%5%11%21%10%
1800
21st to endDay
55%413%17%9%1
1980
November1st to 10thDay
43%5%12%21%16%2
1754
11th to 20thDay
54%411%18%10%2
1600
21st to endDay
59%5%12%16%6%1
1520
December1st to 10thDay
70%5%10%11%3
1520
11th to 20thDay
67%410%16%3
1906
21st to endDay
77%310%9%2
2781
January1st to 10thNight
66%5%9%14%5%
2459
11th to 20thNight
69%5%10%13%3
2399
21st to endNight
66%410%15%5%1
2574
February1st to 10thNight
64%410%16%5%
2340
11th to 20thNight
63%410%16%7%
2275
21st to endNight
62%5%9%14%9%1
1773
March1st to 10thNight
52%5%11%20%11%1
1980
11th to 20thNight
51%412%21%9%2
1980
21st to endNight
53%5%8%18%13%3
2178
April1st to 10thNight
51%410%19%14%3
1896
11th to 20thNight
47%5%12%17%15%3
1735
21st to endNight
45%6%12%22%13%3
1620
May1st to 10thNight
48%8%9%19%12%3
1620
11th to 20thNight
47%7%11%18%15%3
1593
21st to endNight
34%9%14%27%14%2
1617
June1st to 10thNight
36%8%14%24%16%2
1440
11th to 20thNight
38%8%15%23%15%2
1440
21st to endNight
37%8%13%25%16%2
1440
July1st to 10thNight
36%10%11%22%17%4
1480
11th to 20thNight
31%8%15%25%19%2
1566
21st to endNight
38%9%16%21%13%3
1672
August1st to 10thNight
33%9%15%26%17%1
1600
11th to 20thNight
35%8%15%26%14%2
1598
21st to endNight
33%9%13%25%15%4
1864
September1st to 10thNight
34%7%11%23%19%5%
1810
11th to 20thNight
29%8%14%26%22%1
1980
21st to endNight
41%6%13%22%18%1
1980
October1st to 10thNight
39%7%12%24%15%2
2148
11th to 20thNight
47%5%12%23%12%1
2160
21st to endNight
52%5%10%21%11%2
2376
November1st to 10thNight
41%412%23%16%3
2320
11th to 20thNight
53%411%20%10%2
2578
21st to endNight
57%412%21%6%1
2660
December1st to 10thNight
67%5%11%13%4
2660
11th to 20thNight
64%5%12%16%3
3288
21st to endNight
74%5%10%10%2
4870

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 10thDay
31%28%27%10%41
270
11th to 20thDay
34%26%30%9%2
252
21st to endDay
27%31%32%7%21
264
February1st to 10thDay
35%21%36%7%
240
11th to 20thDay
35%30%30%5%
240
21st to endDay
39%24%30%7%
209
March1st to 10thDay
30%20%31%16%2
420
11th to 20thDay
32%19%30%13%5%1
420
21st to endDay
34%19%27%15%5%1
462
April1st to 10thDay
28%21%27%15%8%1
420
11th to 20thDay
25%19%27%16%9%4
412
21st to endDay
30%16%30%15%6%2
420
May1st to 10thDay
28%18%26%19%6%3
423
11th to 20thDay
23%15%30%21%8%3
447
21st to endDay
16%7%28%25%18%6%
485
June1st to 10thDay
14%12%31%26%13%4
450
11th to 20thDay
18%13%24%27%14%4
450
21st to endDay
14%10%33%28%13%2
450
July1st to 10thDay
13%6%21%26%22%11%
445
11th to 20thDay
13%6%27%28%19%8%
444
21st to endDay
14%6%24%28%19%8%
488
August1st to 10thDay
11%6%22%30%20%11%
446
11th to 20thDay
15%5%22%28%19%10%
439
21st to endDay
12%5%24%26%20%12%
495
September1st to 10thDay
18%8%21%27%19%8%
450
11th to 20thDay
13%5%18%31%22%10%
450
21st to endDay
19%13%24%24%16%4
450
October1st to 10thDay
16%10%28%25%17%5%
450
11th to 20thDay
23%16%30%22%7%1
450
21st to endDay
30%16%31%17%6%
495
November1st to 10thDay
19%19%33%16%10%3
352
11th to 20thDay
30%18%30%13%7%1
218
21st to endDay
24%23%40%12%1
180
December1st to 10thDay
31%27%27%9%32
180
11th to 20thDay
29%23%33%12%2
180
21st to endDay
36%23%28%12%1
202
January1st to 10thNight
29%21%33%14%3
760
11th to 20thNight
30%18%32%17%2
739
21st to endNight
26%22%29%20%3
792
February1st to 10thNight
30%18%28%22%3
720
11th to 20thNight
30%19%35%15%1
703
21st to endNight
30%19%31%18%2
592
March1st to 10thNight
25%19%31%23%3
720
11th to 20thNight
27%17%27%23%5%1
720
21st to endNight
24%16%31%22%6%1
792
April1st to 10thNight
25%15%29%24%6%
720
11th to 20thNight
21%14%32%24%9%1
671
21st to endNight
21%9%36%27%6%
540
May1st to 10thNight
20%11%26%33%9%2
540
11th to 20thNight
20%7%28%31%12%1
531
21st to endNight
12%225%35%22%3
456
June1st to 10thNight
11%425%41%19%
360
11th to 20thNight
13%425%38%19%1
360
21st to endNight
8%427%37%23%1
360
July1st to 10thNight
7%218%41%26%7%
430
11th to 20thNight
8%220%36%29%5%
522
21st to endNight
11%415%42%27%2
591
August1st to 10thNight
10%216%39%30%3
537
11th to 20thNight
11%313%40%28%4
534
21st to endNight
12%421%30%27%6%
676
September1st to 10thNight
15%418%33%26%4
720
11th to 20thNight
12%416%34%31%4
720
21st to endNight
17%8%24%26%20%4
720
October1st to 10thNight
18%7%24%29%21%2
720
11th to 20thNight
22%12%30%24%10%1
720
21st to endNight
30%13%25%26%7%
792
November1st to 10thNight
19%11%25%31%14%
740
11th to 20thNight
27%16%27%21%8%1
760
21st to endNight
27%17%27%22%6%
760
December1st to 10thNight
33%17%27%18%5%
760
11th to 20thNight
29%18%28%21%4
760
21st to endNight
30%18%29%21%2
836
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