Discovery Park of America
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Discovery Park of America clear sky chart from 2005-11-06 to 2024-01-13.

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
47%
24150
23%
74533
17%
24096
54%
24096
29%
45760

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
28%
950
21%
2648
9%
946
37%
946
24%
1770
January11th to 20thNight
23%
915
20%
2439
8%
915
33%
915
21%
1725
January21st to endNight
25%
990
23%
2574
8%
990
36%
990
29%
1695
February1st to 10thNight
24%
746
18%
2186
8%
746
32%
746
20%
1524
February11th to 20thNight
21%
703
20%
2099
9%
700
30%
700
22%
1399
February21st to endNight
22%
592
20%
1776
7%
592
33%
592
19%
1204
March1st to 10thNight
30%
720
21%
2160
10%
720
39%
720
24%
1393
March11th to 20thNight
28%
622
18%
2062
11%
622
36%
622
21%
1372
March21st to endNight
36%
594
18%
2003
12%
594
44%
594
20%
1337
April1st to 10thNight
37%
540
26%
1800
15%
540
52%
540
32%
1019
April11th to 20thNight
41%
533
26%
1775
20%
533
53%
533
28%
1062
April21st to endNight
40%
540
22%
1800
16%
540
51%
540
26%
1110
May1st to 10thNight
45%
540
20%
1729
14%
540
53%
540
27%
1076
May11th to 20thNight
54%
531
18%
1593
15%
531
57%
531
27%
1031
May21st to endNight
65%
583
21%
1627
17%
582
67%
582
34%
1013
June1st to 10thNight
65%
540
23%
1440
18%
540
67%
540
34%
914
June11th to 20thNight
78%
540
29%
1440
24%
540
80%
540
49%
791
June21st to endNight
79%
540
25%
1440
19%
540
80%
540
46%
823
July1st to 10thNight
76%
525
19%
1400
17%
525
77%
525
36%
871
July11th to 20thNight
75%
522
23%
1392
20%
522
77%
522
41%
818
July21st to endNight
75%
591
25%
1606
23%
558
76%
558
41%
915
August1st to 10thNight
78%
537
21%
1775
26%
534
79%
534
34%
971
August11th to 20thNight
77%
534
25%
1776
29%
534
79%
534
35%
979
August21st to endNight
74%
594
25%
1980
31%
594
75%
594
36%
1086
September1st to 10thNight
73%
540
28%
1800
30%
540
75%
540
37%
970
September11th to 20thNight
69%
613
31%
1873
28%
613
72%
613
35%
1078
September21st to endNight
63%
720
30%
1980
22%
720
67%
720
43%
1106
October1st to 10thNight
66%
720
32%
2028
27%
720
69%
720
43%
1118
October11th to 20thNight
48%
720
32%
2160
22%
720
58%
720
36%
1235
October21st to endNight
42%
792
27%
2424
20%
792
50%
792
29%
1490
November1st to 10thNight
50%
740
31%
2406
25%
740
60%
740
36%
1303
November11th to 20thNight
39%
760
30%
2470
20%
760
53%
760
34%
1383
November21st to endNight
40%
760
25%
2470
20%
760
49%
760
27%
1487
December1st to 10thNight
32%
779
22%
2489
13%
779
43%
779
22%
1625
December11th to 20thNight
35%
948
23%
3137
13%
948
43%
948
23%
1963
December21st to endNight
26%
1036
12%
4776
8%
1026
36%
1026
13%
3104

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
13%6%35%5%345%5%7%43%
74777
Night
13%6%35%5%3445%7%47%
74974
TransparencyDay
39%6%11%23%17%3
74488
Night
37%5%10%23%20%4
74786
SeeingDay
15%7%21%25%21%10%
14255
Night
16%6%24%32%18%3
24162

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
19%8%37%433435%41%
1517
11th to 20thDay
20%9%35%6%34445%37%
1578
21st to endDay
15%9%36%5%23335%46%
1782
February1st to 10thDay
19%9%46%434345%39%
1771
11th to 20thDay
20%10%45%5%34346%37%
1748
21st to endDay
20%9%47%6%34345%35%
1480
March1st to 10thDay
19%8%36%423345%43%
1800
11th to 20thDay
21%9%37%6%24445%35%
1912
21st to endDay
18%8%37%5%35%45%7%35%
2353
April1st to 10thDay
12%6%26%5%3445%7%46%
2160
11th to 20thDay
17%7%26%6%2445%5%42%
2134
21st to endDay
16%6%35%5%3445%7%41%
2160
May1st to 10thDay
16%6%35%6%35%5%5%8%40%
2227
11th to 20thDay
13%7%36%5%45%45%7%41%
2301
21st to endDay
8%6%26%8%46%6%7%9%37%
2645
June1st to 10thDay
8%425%5%35%6%7%10%46%
2520
11th to 20thDay
43245%36%7%7%11%48%
2520
21st to endDay
45%245%46%6%7%11%46%
2520
July1st to 10thDay
7%426%7%5%7%7%8%10%38%
2520
11th to 20thDay
6%5%15%6%45%6%9%11%43%
2520
21st to endDay
6%435%6%46%6%8%11%43%
2614
August1st to 10thDay
6%4245%36%7%8%11%43%
2148
11th to 20thDay
9%6%25%445%5%7%10%43%
2125
21st to endDay
8%5%25%5%345%6%10%47%
2376
September1st to 10thDay
10%5%25%5%445%6%8%46%
2160
11th to 20thDay
12%5%245%25%45%9%48%
2067
21st to endDay
11%423325%447%54%
1980
October1st to 10thDay
9%425%43435%6%57%
1928
11th to 20thDay
13%5%2442345%5%52%
1800
21st to endDay
19%6%24323445%48%
1931
November1st to 10thDay
11%5%24333346%56%
1672
11th to 20thDay
14%6%35%423445%51%
1710
21st to endDay
17%6%36%434446%43%
1710
December1st to 10thDay
18%8%35%5%35%346%40%
1687
11th to 20thDay
16%8%36%6%3445%6%41%
1918
21st to endDay
15%11%37%6%45%45%5%33%
2783
January1st to 10thNight
19%7%45%434446%43%
2648
11th to 20thNight
20%7%47%5%3445%5%37%
2439
21st to endNight
17%7%35%4235%5%5%45%
2574
February1st to 10thNight
21%9%35%6%33445%38%
2186
11th to 20thNight
18%6%36%5%34435%42%
2098
21st to endNight
20%7%36%5%3445%6%38%
1776
March1st to 10thNight
18%7%24424445%45%
2160
11th to 20thNight
18%9%45%43435%5%39%
2062
21st to endNight
15%8%37%5%35%5%6%6%37%
2003
April1st to 10thNight
11%5%25%5%3346%7%50%
1800
11th to 20thNight
15%5%35%434347%48%
1775
21st to endNight
14%426%5%345%6%8%43%
1800
May1st to 10thNight
14%5%35%4245%6%7%46%
1729
11th to 20thNight
11%6%26%5%35%6%5%8%43%
1592
21st to endNight
6%435%6%36%7%7%10%44%
1627
June1st to 10thNight
7%5%35%5%3447%8%47%
1440
11th to 20thNight
422333446%10%58%
1440
21st to endNight
2223435%6%7%12%55%
1440
July1st to 10thNight
4425%6%36%7%7%11%45%
1440
11th to 20thNight
5%4235%335%5%12%52%
1440
21st to endNight
5%4244345%6%11%52%
1700
August1st to 10thNight
4325%5%35%6%7%10%51%
1786
11th to 20thNight
6%325%435%6%7%8%52%
1776
21st to endNight
7%425%43446%10%51%
1980
September1st to 10thNight
8%5%245%34347%56%
1800
11th to 20thNight
7%5%246%3445%6%54%
1873
21st to endNight
9%42442345%6%58%
1980
October1st to 10thNight
7%423434346%60%
2028
11th to 20thNight
14%423333345%56%
2160
21st to endNight
17%7%24434345%48%
2424
November1st to 10thNight
11%5%24323345%58%
2406
11th to 20thNight
13%5%2442345%6%53%
2470
21st to endNight
16%5%24434446%49%
2470
December1st to 10thNight
18%8%25%6%34445%41%
2489
11th to 20thNight
17%7%34434445%45%
3279
21st to endNight
16%8%47%6%45%5%5%6%34%
4884

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
45%5%7%25%16%3
1518
11th to 20thDay
50%410%22%13%1
1578
21st to endDay
42%310%27%15%2
1782
February1st to 10thDay
49%48%23%14%2
1771
11th to 20thDay
49%5%9%21%13%4
1758
21st to endDay
53%48%17%13%5%
1480
March1st to 10thDay
45%39%21%18%5%
1800
11th to 20thDay
52%5%10%20%12%3
1912
21st to endDay
49%5%12%21%13%1
2353
April1st to 10thDay
38%5%10%26%19%2
2160
11th to 20thDay
44%49%22%17%4
2134
21st to endDay
42%6%9%25%16%1
2160
May1st to 10thDay
43%7%12%23%14%1
2227
11th to 20thDay
42%7%11%21%16%1
2305
21st to endDay
40%11%14%23%10%2
2645
June1st to 10thDay
33%8%14%24%20%2
2520
11th to 20thDay
27%8%12%29%20%4
2520
21st to endDay
29%10%13%24%18%5%
2520
July1st to 10thDay
36%12%14%20%14%4
2451
11th to 20thDay
33%10%16%22%15%5%
2445
21st to endDay
33%10%15%28%13%1
2469
August1st to 10thDay
31%10%17%25%14%1
2136
11th to 20thDay
36%9%13%25%16%2
2125
21st to endDay
33%7%13%26%16%4
2376
September1st to 10thDay
34%7%11%25%19%3
2160
11th to 20thDay
35%7%8%22%24%4
2067
21st to endDay
31%48%25%26%6%
1980
October1st to 10thDay
29%5%10%22%27%7%
1928
11th to 20thDay
34%47%21%25%9%
1800
21st to endDay
39%46%24%21%5%
1931
November1st to 10thDay
31%48%25%26%6%
1672
11th to 20thDay
37%37%23%24%6%
1710
21st to endDay
44%47%23%19%4
1710
December1st to 10thDay
46%5%8%23%15%2
1687
11th to 20thDay
45%49%23%18%2
1915
21st to endDay
51%5%11%20%12%2
2783
January1st to 10thNight
44%48%23%18%2
2648
11th to 20thNight
50%49%22%14%2
2439
21st to endNight
40%410%26%18%2
2574
February1st to 10thNight
50%410%18%17%2
2186
11th to 20thNight
46%5%8%21%17%3
2099
21st to endNight
48%48%19%16%5%
1776
March1st to 10thNight
43%47%17%20%8%
2160
11th to 20thNight
47%5%8%21%16%3
2062
21st to endNight
46%6%10%21%14%2
2003
April1st to 10thNight
33%412%26%20%5%
1800
11th to 20thNight
37%5%8%22%21%7%
1775
21st to endNight
38%7%10%24%19%3
1800
May1st to 10thNight
38%7%9%25%17%4
1729
11th to 20thNight
38%9%14%21%16%2
1593
21st to endNight
32%9%14%28%14%3
1628
June1st to 10thNight
34%7%11%22%24%1
1440
11th to 20thNight
22%6%15%31%21%5%
1440
21st to endNight
21%9%17%26%19%7%
1440
July1st to 10thNight
29%11%16%25%17%3
1400
11th to 20thNight
26%8%16%26%16%7%
1392
21st to endNight
24%9%17%31%18%1
1606
August1st to 10thNight
26%10%16%31%16%1
1775
11th to 20thNight
26%9%13%27%21%3
1776
21st to endNight
27%7%14%27%18%6%
1980
September1st to 10thNight
28%5%10%30%21%6%
1800
11th to 20thNight
31%6%8%24%25%5%
1873
21st to endNight
27%411%24%26%7%
1980
October1st to 10thNight
25%5%9%26%27%8%
2028
11th to 20thNight
32%46%21%28%8%
2160
21st to endNight
39%46%20%24%7%
2424
November1st to 10thNight
30%46%26%28%6%
2406
11th to 20thNight
33%37%22%25%9%
2470
21st to endNight
39%47%24%23%3
2470
December1st to 10thNight
45%49%22%17%3
2489
11th to 20thNight
41%48%22%21%3
3281
21st to endNight
49%5%11%19%13%3
4884

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
27%13%36%19%41
270
11th to 20thDay
26%17%37%17%41
248
21st to endDay
19%16%44%17%3
264
February1st to 10thDay
28%13%38%15%6%1
240
11th to 20thDay
33%17%36%12%3
240
21st to endDay
36%12%30%19%3
198
March1st to 10thDay
24%13%38%19%6%1
240
11th to 20thDay
24%17%37%20%3
240
21st to endDay
24%12%33%21%8%1
439
April1st to 10thDay
17%12%32%27%11%1
420
11th to 20thDay
21%12%27%26%11%2
412
21st to endDay
21%7%33%25%11%4
420
May1st to 10thDay
18%10%27%31%10%4
423
11th to 20thDay
18%5%21%26%19%10%
447
21st to endDay
10%319%31%24%13%
599
June1st to 10thDay
12%314%24%29%18%
630
11th to 20thDay
5%113%33%34%13%
630
21st to endDay
5%218%35%25%14%
630
July1st to 10thDay
7%210%26%29%27%
621
11th to 20thDay
8%29%26%36%20%
618
21st to endDay
7%29%28%33%21%
684
August1st to 10thDay
8%26%28%39%17%
446
11th to 20thDay
14%38%26%35%15%
439
21st to endDay
12%16%21%37%23%
495
September1st to 10thDay
11%37%26%33%21%
450
11th to 20thDay
12%18%20%37%22%
450
21st to endDay
16%415%27%26%12%
450
October1st to 10thDay
10%220%31%30%6%
398
11th to 20thDay
15%10%32%26%14%4
270
21st to endDay
25%11%27%21%14%2
297
November1st to 10thDay
15%5%29%32%14%4
270
11th to 20thDay
10%13%36%28%13%1
270
21st to endDay
22%10%29%25%13%2
270
December1st to 10thDay
22%14%33%19%10%1
270
11th to 20thDay
23%11%31%23%11%1
270
21st to endDay
25%18%33%20%41
297
January1st to 10thNight
24%10%34%27%5%
950
11th to 20thNight
25%12%34%24%4
915
21st to endNight
20%10%40%27%3
990
February1st to 10thNight
25%9%36%26%4
746
11th to 20thNight
22%13%39%24%2
703
21st to endNight
25%13%38%23%2
592
March1st to 10thNight
22%10%32%31%5%
720
11th to 20thNight
23%10%35%25%6%
622
21st to endNight
18%9%31%31%10%
594
April1st to 10thNight
13%9%38%31%10%
540
11th to 20thNight
17%9%28%33%11%2
533
21st to endNight
14%5%34%34%12%1
540
May1st to 10thNight
16%5%28%37%12%1
540
11th to 20thNight
13%421%39%21%2
531
21st to endNight
8%215%41%29%5%
584
June1st to 10thNight
11%211%41%31%5%
540
11th to 20thNight
5%10%46%36%4
540
21st to endNight
4110%44%37%5%
540
July1st to 10thNight
6%25%32%46%10%
525
11th to 20thNight
6%18%30%46%9%
522
21st to endNight
6%28%32%43%9%
591
August1st to 10thNight
5%1436%46%8%
537
11th to 20thNight
6%2442%42%5%
534
21st to endNight
8%1428%48%10%
594
September1st to 10thNight
10%26%33%44%6%
540
11th to 20thNight
9%19%34%39%7%
613
21st to endNight
10%315%36%30%5%
720
October1st to 10thNight
9%315%37%31%4
720
11th to 20thNight
16%426%35%18%1
720
21st to endNight
22%5%27%33%12%1
792
November1st to 10thNight
14%5%26%40%14%1
740
11th to 20thNight
14%8%34%33%11%
760
21st to endNight
20%8%28%32%10%1
760
December1st to 10thNight
23%8%31%31%8%
779
11th to 20thNight
22%7%29%33%7%
950
21st to endNight
25%11%32%27%4
1045
Page generated at 2024-01-10 18:35:24. Version ac07

Copyright 2024 Attilla Danko


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